Aqueous dispersions of perfluoroolefin polymers containing film-forming materials

Claim 2

An aqueous dispersion coating composition wherein the dispersed phase consists essentially of: (A) 20 to 80% by weight, based on the weight of (A) plus (B), of a perfluoroolefin polymer containing 5 to 100% by weight, based on the perfluoroolefin polymer, of tetrafluoroethylene and 95 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene; and (B) 80 to 20% by weight, based on the weight of (A) plus (B), of a film-forming material, said film-forming material being capable of forming a film below the fusion point of the perfluoroolefin polymer and does not decompose at the film forming temperature of said dispersion; wherein the coating resulting from said aqueous dispersion is not uniform in composition throughout its thickness but is composed predominantly of the film-forming material at the substrate-film interface and of the perfluoroolefin polymer at the film-air interface.

Claim 3

The aqueous dispersion of claim 1 wherein said perfluoroolefin polymer is polytetrafluoroethylene having a weight average molecular weight, determined by melt viscosity measurements, in excess of 20,000 and its particles having a minimum average dimension of 0.05 micron and a maximum average dimension of 15 microns.

Claim 4

The aqueous dispersion of claim 1 wherein said perfluoroolefin polymer is a tetrafluoroethylene/hexafluoropropylene copolymer in a comonomer weight ratio range of 93-95/7-5, having a weight average molecular weight, determined by melt viscosity measurements, in excess of 20,000 and its particles having a minimum average dimension of 0.05 micron and a maximum average dimension of 15 microns.

Claim 5

The aqueous dispersion of claim 1 wherein said perfluoroolefin polymer is a tetrafluoroethylene/hexafluoropropylene copolymer in a comonomer weight ratio range of 84-88/16-12, having a weight average molecular weight, determined by melt viscosity measurements, in excess of 20,000 and its particles having a minimum average dimension of 0.05 micron and a maximum average dimension of 15 microns.

Claim 6

The aqueous dispersion of claim 1 wherein said perfluoroolefin polymer is a tetrafluoroethylene/hexafluoropropylene copolymer in a comonomer weight ratio range of 75-80/25-20, having a weight average molecular weight, determined by melt viscosity measurements, in excess of 20,000 and its particles having a minimum average dimension of 0.05 micron and a maximum average dimension of 15 microns.

Claim 7

The aqueous dispersion of claim 1 wherein said film-forming material is a polyamide acid salt consisting essentially of the non-volatile content of a solution of: (A) 10 to 70% by weight, based on the solution, of a salt of a polyamide acid with a tertiary amine, wherein the polyamide acid is of the general formula ##STR2## wherein G is a hydrogen atom or a carboxyl group; wherein the → denotes isomerism so that in any recurring unit within the polymeric structure the groups to which the arrows point may exist as shown or in an interchanged position; wherein R is an organic tetravalent radical containing at least two carbon atoms and no more than two carbonyl groups of each polyamide acid unit are attached to any one carbon atom; wherein R 1 is a divalent radical containing at least two carbon atoms, the amide groups of adjacent polyamide acid units are attached to separate carbon atoms of said divalent radical; and wherein n is an integer sufficient to provide a polyamide acid having an inherent viscosity of at least 0.1, preferably 0.3-5.0, as measured as a 0.5% solution in N,N-dimethylacetamide at 30° C., and wherein said tertiary amine is present in at least a stoichiometrically equivalent amount to the free carboxylic acid groups in said polyamide acid; (B) 5 to 25% by weight, based on the solution, of a viscosity reducing agent which is miscible with water and has a solubility parameter range of 10-21.6 wherein said solubility parameter has a dispersion component in the range of 7.0-10.0, a polar component in the range of 2.0-11.0, and a hydrogen bonding component in the range of 7.0-14.0; (C) 5 to 35% by weight, based on the solution, of a coalescing agent, wherein said coalescing agent is at least one member selected from the group consisting of N-methylpyrrolidone, dimethyl formamide, dimethyl acetamide, dimethyl sulfoxide, cresylic acid, sulfolane, formamide; and wherein water comprises 30-80% by weight of the solution.

Claim 8

The aqueous dispersion of claim 1 wherein said film-forming material is a blend consisting essentially of the non-volatile components of: (A) a polymeric quaternary ammonium hydroxide prepared from (a) 50-97 parts by weight, based on the weight of components (a) plus (B), of an epoxy resin containing, on the average, two terminal 1,2-epoxy groups per molecule and having a molecular weight of 350-5,000; reacted with (b) an aqueous solution of 0.75-1.25 equivalents, per equivalent of epoxy group of said epoxy resin of (a), of a tertiary amine; and (B) 3-50 parts by weight, based on the weight of components (a) plus (B), of a nitrogen resin crosslinking agent or mixtures thereof; wherein (A) and (B) are dissolved or dispersed in water and an organic liquid or mixture of such liquids wherein the water and said organic liquid are in a ratio of from 70:30 to 90:10 and said blend having a pH of 10 or above.

Claim 9

The aqueous dispersion of claim 1 wherein said film-forming material is a blend consisting essentially of the non-volatile components of: (A) a polymeric quaternary ammonium hydroxide prepared from (a) 50-97 parts by weight, based on the weight of components (a) and (B), of an epoxy polymer containing, on the average, more than two randomly distributed 1,2-epoxy groups per molecule and selected from the group consisting of: a polyglycidyl ether of a novolac resin having 3-11 epoxy groups per molecule and a molecular weight range of 470-2,00 and an epoxy polymer containing an epoxy-functional monomer, having 10-150 epoxy groups per molecule and a weight average molecular weight, determined by gel permeation chromatography, using a polystyrene standard, of 25,000-75,000; reacted with (b) an aqueous solution of 0.75-1.25 equivalents, per equivalent of epoxy group of said epoxy resin of (a), of a tertiary amine; and (B) 3-50 parts by weight, based on the weight of components (a) plus (B), of a nitrogen resin crosslinking agent or mixtures thereof, wherein (A) and (B) are dissolved or dispersed in water and an organic liquid or mixture of such liquids wherein the water and said organic liquid are in a ratio of from 70:30 to 90:10 and said blend having a pH of 10 or above.

Claim 10

The aqueous dispersion of claim 1 wherein said film-forming material is a blend consisting essentially of (A) 35-55 parts, based on the weight of the blend, of a terpolymer of (a) 10 to 80% by weight of a monomer represented by the structure ##STR3## where R is a hydrogen or a mono-valent alkyl radical of 1-2 carbon atoms; (b) 15 to 80% by weight of at least one ethylenically unsaturated nitrile monomer, selected from the group consisting of acrylonitrile and methacrylonitrile, and (c) 9 to 25% by weight of at least one ethylenically unsaturated acid monomer, selected from the group consisting of acrylic acid, methacrylic acid, and itaconic acid, the total of (a), (b), (c) being 100%, wherein said terpolymer is neutralized with a substantially equivalent amount of water-soluble tertiary amine, and (B) 23-53 parts, based on the weight of the blend, of an epoxy resin containing, on the average, two terminal 1,2 epoxy groups per molecule and having a molecular weight of 350-5,000, (C) 10-30 parts, based on the weight of the blend, of a nitrogen-resin crosslinking agent.

Claim 11

The aqueous dispersion of claim 2 wherein said polytetrafluoroethylene comprises 45-60%, by weight, of the dispersed phase.

Claim 12

The aqueous dispersion of claim 3 wherein said tetrafluoroethylene/hexafluoropropylene copolymer comprises 45-60%, by weight, of the dispersed phase.

Claim 13

The aqueous dispersion of claim 4 wherein said tetrafluoroethylene/hexafluoropropylene copolymer comprises 45-60%, by weight, of the dispersed phase.

Claim 14

The aqueous dispersion of claim 5 wherein said tetrafluoroethylene/hexafluoropropylene copolymer comprises 45-60%, by weight, of the dispersed phase.

Claim 15

The aqueous dispersion of claim 6 wherein said film-forming material consists essentially of (A) 25-45% by weight, based on the solution, of a salt of a polyamide acid with tertiary amine, wherein the polyamide acid is formed from trimellitic anhydride and bis(4-aminophenyl)methane and wherein the tertiary amine is a 4:1 to 1:4 by weight mixture of triethylamine and diethyl 2-hydroxyethylamine; (B) 10-20% by weight, based on the solution, of furfuryl alcohol; and (C) 10-25% by weight, based on the solution, of N-methylpyrrolidone.

Claim 16

The aqueous dispersion of claim 7 wherein there is also present in the film-forming material an acid catalyst in a quantity sufficient to lower the pH of the blend to between 7.5 and 12.

Claim 17

The aqueous dispersion of claim 15 wherein said film-forming material is a blend consisting essentially of the non-volatile components of: (A) a polymeric quaternary ammonium hydroxide prepared from (a) 65-85 parts by weight, based on the weight of components (a) plus (B), of an epoxy resin containing, on the average, two terminal 1,2-epoxy groups per molecule and having a molecular weight of 1,000 to 2,500, reacted with (b) an aqueous solution of 0.75-1.25 equivalents, per equivalent of epoxy group of said epoxy resin of (a), of a tertiary amine selected from the group consisting of: trimethyl amine, dimethyl ethyl amine, diethyl methyl amine, N-methyl pyrrolidine, dimethyl ethanol amine, methyl diethanol amine, ethyl methyl ethanol amine, dimethyl propyl amine, dimethyl 3-hydroxy-1-propyl amine, dimethyl 2-hydroxy-1-propyl amine, dimethyl 1-hydroxy-2-propyl amine, and mixtures thereof; and (B) 15-35 parts by weight, based on the weight of components (a) plus (B), of a nitrogen resin crosslinking agent or mixtures thereof.

Claim 18

The aqueous dispersion of claim 15 wherein said film-forming material is a blend consisting essentially of the non-volatile components of: (A) a polymeric quaternary hydroxide prepared from: (a) 65-75 parts by weight, based on the weight of components (a) plus (B), of an epoxy resin containing, on the average, two terminal 1,2-epoxy groups per molecule and having a molecular weight of 4,000-5,000; reacted with (b) an aqueous solution of 0.8-1.2 equivalents, per equivalent of epoxy group of said epoxy resin of (a), of a tertiary amine selected from the group consisting of trimethyl amine, dimethyl ethanol amine or mixtures thereof; and (B) 25-35 parts by weight, based on the weight of components (a) plus (B), of a partially methylated melamine crosslinking agent.

Claim 19

The aqueous dispersion of claim 6 wherein said film-forming material is the non-volatile content of a solution consisting essentially of: (A) 25-45% by weight, based on the solution, of a salt of a polyamide acid with tertiary amine, wherein the polyamide acid is formed from trimellitic anhydride and bis(4-aminophenyl)methane and wherein the tertiary amine is a 4:1 to 1:4 by weight mixture of triethylamine and diethyl 2-hydroxyethylamine; (B) 10-20% by weight, based on the solution, of furfuryl alcohol; (C) 10-25% by weight, based on the solution, of N-methylpyrrolidone; and wherein water comprises 30-55% by weight of the solution.

Claim 20

The aqueous dispersion of claim 8 wherein there is also present in the film-forming material an acid catalyst in a quantity sufficient to lower the pH of the blend to between 7.5 and 12.

Claim 21

The aqueous dispersion of claim 9 wherein said film-forming material is a blend consisting essentially of: (A) 45-50 parts by weight, based on the weight of the blend, of a terpolymer of (a) 10 to 80% by weight of a monomer represented by the structure ##STR4## where R is hydrogen or a mono-valent alkyl radical of 1-2 carbon atoms; (b) 15 to 25% by weight of at least one ethylenically unsaturated nitrile monomer, selected from the group consisting of acrylonitrile and methacrylonitrile, and (c) 10 to 20% by weight of at least one ethylenically unsaturated acid monomer, selected from the group consisting of acrylic acid, methacrylic acid, and itaconic acid, the total of (a), (b), (c) being 100%, wherein said terpolymer is neutralized with a substantially equivalent amount of water-soluble tertiary amine, (B) 30-40 parts by weight, based on the weight of the blend, of an epoxy resin containing, on the average, two terminal 1,2 epoxy groups per molecule and having a molecular weight of 1,500-2,500, and (C) 10-20 parts by weight, based on the weight of the blend, of a nitrogen resin crosslinking agent.

Claim 22

An aqueous dispersion, wherein the dispersed phase consists essentially of (A) 45 to 60% by weight, based on the weight of (A) plus (B), of a perfluoroolefin polymer containing 75 to 100% by weight, based on the perfluoroolefin polymer, of tetrafluoroethylene and 25 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene; and (B) 40 to 55% by weight, based on the weight of (A) plus (B), of a film-forming material wherein said film-forming material is the non-volatile content of a solution consisting essentially of (a) 25-45% by weight, based on the solution, of a salt of a polyamide acid with tertiary amine, wherein the polyamide acid is formed from trimellitic anhydride and bis(4-aminophenyl)methane and wherein the tertiary amine is a 4:1 to 1:4 by weight mixture of triethylamine and diethyl 2-hydroxyethylamine; (b) 10-20% by weight, based on the solution, of furfuryl alcohol; (c) 10-25% by weight, based on the solution, of N-methylpyrrolidone; and wherein water comprises 30-55% by weight of the solution.

Claim 23

An aqueous dispersion, wherein the dispersed phase consists essentially of (A) 45 to 60% by weight, based on the weight of (A) plus (B), of a perfluoroolefin polymer containing 75 to 100% by weight, based on the perfluoroolefin polymer, of tetrafluoroethylene and 25 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene; and (B) 40 to 55% by weight, based on the weight of (A) plus (B), of a film-forming material wherein said film-forming material is the non-volatile content of a solution consisting essentially of (a) 25-45% by weight, based on the solution, of a salt of a polyamide acid with tertiary amine, wherein the polyamide acid is formed from trimellitic anhydride and bis(4-aminophenyl)methane and wherein the tertiary amine is a 4:1 to 1:4 by weight mixture of triethylamine and diethyl 2-hydroxyethylamine; (b) 10-20% by weight, based on the solution, of furfuryl alcohol; (c) 10-25% by weight, based on the solution, of N-methylpyrrolidone; and wherein water comprises 30-55% by weight of the solution.

Claim 24

An aqueous dispersion, wherein the dispersed phase consists essentially of: (A) 45 to 60% by weight, based on the weight of (A) plus (B), of a perfluoroolefin polymer containing 75 to 100% by weight, based on the perfluoroolefin polymer, of tetrafluoroethylene and 25 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene; and (B) 40 to 55% by weight, based on the weight of (A) plus (B), of a film-forming material wherein said film-forming material is the non-volatile content of a blend consisting essentially of: (1) a polymeric quaternary hydroxide prepared from: (a) 65-85 parts by weight, based on the weight of components (a) plus (2), of an epoxy resin containing, on the average, two terminal 1,2-epoxy groups per molecule and having a molecular weight of 1,000 to 2,500, reacted with (b) an aqueous solution of 0.75-1.25 equivalents, per equivalent of epoxy group of said epoxy resin of (a), of a tertiary amine selected from the group consisting of: trimethyl amine, dimethyl ethyl amine, diethyl methyl amine, N-methyl pyrrolidine, dimethyl ethanol amine, methyl diethanol amine, ethyl methyl ethanol amine, dimethyl propyl amine, dimethyl 3-hydroxy-1-propyl amine, dimethyl 2-hydroxy-1-propyl amine, dimethyl 1-hydroxy-2-propyl amine, and mixtures thereof; and (2) 25-35 parts by weight, based on the weight of components (a) plus (2), of a partially methylated melamine crosslinking agent; wherein (1) and (2) are dissolved or dispersed in water and an organic liquid or mixture of such liquids wherein the water and said organic liquid are in a ratio of from 70:30 to 90:10 and said blend having a pH of 10 or above.

Claim 25

An aqueous dispersion, wherein the dispersed phase consists essentially of: (A) 45 to 60% by weight, based on the weight of (A) plus (B), of a perfluoroolefin polymer containing 75 to 100% by weight, based on the perfluoroolefin polymer, of tetrafluoroethylene and 25 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene; and (B) 40 to 55% by weight, based on the weight of (A) plus (B), of a film-forming material wherein said film-forming material is the non-volatile content of a blend consisting essentially of: (1) a polymeric quaternary hydroxide prepared from: (a) 65-85 parts by weight, based on the weight of components (a) plus (2), of an epoxy resin containing, on the average, two terminal 1,2-epoxy groups per molecule and having a molecular weight of 1,000 to 2,500, reacted with (b) an aqueous solution of 0.75-1.25 equivalents, per equivalent of epoxy group of said epoxy resin of (a), of a tertiary amine selected from the group consisting of: trimethyl amine, dimethyl ethyl amine, diethyl methyl amine, N-methyl pyrrolidine, dimethyl ethanol amine, methyl diethanol amine, ethyl methyl ethanol amine, dimethyl propyl amine, dimethyl 3-hydroxy-1-propyl amine, dimethyl 2-hydroxy-1-propyl amine, dimethyl 1-hydroxy-2-propyl amine, and mixtures thereof; and (2) 25-35 parts by weight, based on the weight of components (a) plus (2), of a partially methylated melamine crosslinking agent; wherein (1) and (2) are dissolved or dispersed in water and an organic liquid or mixture of such liquids wherein the water and said organic liquid are in a ratio of from 70:30 to 90:10 and said blend having a pH of 10 or above.

Claim 26

An aqueous dispersion, wherein the dispersed phase consists essentially of: (A) 45 to 60% by weight, based on the weight of (A) plus (B), of a perfluoroolefin polymer containing 75 to 100% by weight, based on the perfluoroolefin polymer, of tetrafluoroethylene and 25 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene; and (B) 40 to 55% by weight, based on the weight of (A) plus (B), of a film-forming material wherein said film-forming material is a blend consisting essentially of: (1) 45-50 parts by weight, based on the weight of the blend, of a terpolymer of (a) 10 to 80% by weight of a monomer represented by the structure ##STR5## where R is hydrogen or a mono-valent alkyl radical of 1-2 carbon atoms; (b) 15 to 25% by weight of at least one ethylenically unsaturated nitrile monomer, selected from the group consisting of acrylonitrile and methacrylonitrile, and (c) 10 to 20% by weight of at least one ethylenically unsaturated acid monomer, selected from the group consisting of acrylic acid, methacrylic acid, and itaconic acid, the total of (a), (b), (c) being 100%, wherein said terpolymer is neutralized with a substantially equivalent amount of water-soluble tertiary amine, (2) 30-40 parts by weight, based on the weight of the blend, of an epoxy resin containing, on the average, two terminal 1,2 epoxy groups per molecule and having a molecular weight of 1,500-2,500, and (3) 10-20 parts by weight, based on the weight of the blend, of a nitrogen resin crosslinking agent.

Claim 27

An aqueous dispersion, wherein the dispersed phase consists essentially of: (A) 45 to 60% by weight, based on the weight of (A) plus (B), of a perfluoroolefin polymer containing 75 to 100% by weight, based on the perfluoroolefin polymer, of tetrafluoroethylene and 25 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene; and (B) 40 to 55% by weight, based on the weight of (A) plus (B), of a film-forming material wherein said film-forming material is a blend consisting essentially of: (1) 45-50 parts by weight, based on the weight of the blend, of a terpolymer of (a) 10 to 80% by weight of a monomer represented by the structure ##STR5## where R is hydrogen or a mono-valent alkyl radical of 1-2 carbon atoms; (b) 15 to 25% by weight of at least one ethylenically unsaturated nitrile monomer, selected from the group consisting of acrylonitrile and methacrylonitrile, and (c) 10 to 20% by weight of at least one ethylenically unsaturated acid monomer, selected from the group consisting of acrylic acid, methacrylic acid, and itaconic acid, the total of (a), (b), (c) being 100%, wherein said terpolymer is neutralized with a substantially equivalent amount of water-soluble tertiary amine, (2) 30-40 parts by weight, based on the weight of the blend, of an epoxy resin containing, on the average, two terminal 1,2 epoxy groups per molecule and having a molecular weight of 1,500-2,500, and (3) 10-20 parts by weight, based on the weight of the blend, of a nitrogen resin crosslinking agent.

Claim 28

An aqueous dispersion, wherein the dispersed phase consists essentially of: (A) 50-55% by weight, based on the weight of (A) plus (B), of a tetrafluoroethylene/hexafluoropropylene copolymer in a comonomer weight ratio range of 84-88/16-12, having a weight average molecular weight, determined by melt viscosity measurements, in excess of 20,000 and its particles having a minimum average dimension of 0.05 micron and a maximum average dimension of 15 microns; and (b) 45-50% by weight, based on the weight of (A) plus (B), of a film-forming material wherein said film-forming material is the non-volatile content of a solution consisting essentially of (a) 25-45% by weight, based on the solution, of a salt of a polyamide acid with tertiary amine, wherein the polyamide acid is formed from trimellitic anhydride and bis(4-aminophenyl)methane and wherein the tertiary amine is a 4:1 to 1:4 by weight mixture of triethylamine and diethyl 2-hydroxyethylamine; (b) 10-20% by weight, based on the solution, of furfuryl alcohol; (c) 10-25% by weight, based on the solution, of N-methylpyrrolidone; and wherein water comprises 30-55% by weight of the solution.

Claim 29

An aqueous dispersion, wherein the dispersed phase consists essentially of: (A) 50-55% by weight, based on the weight of (A) plus (B), of a tetrafluoroethylene/hexafluoropropylene copolymer in a comonomer weight ratio range of 84-88/16-12, having a weight average molecular weight, determined by melt viscosity measurements, in excess of 20,000 and its particles having a minimum average dimension of 0.05 micron and a maximum average dimension of 15 microns; and (b) 45-50% by weight, based on the weight of (A) plus (B), of a film-forming material wherein said film-forming material is the non-volatile content of a solution consisting essentially of (a) 25-45% by weight, based on the solution, of a salt of a polyamide acid with tertiary amine, wherein the polyamide acid is formed from trimellitic anhydride and bis(4-aminophenyl)methane and wherein the tertiary amine is a 4:1 to 1:4 by weight mixture of triethylamine and diethyl 2-hydroxyethylamine; (b) 10-20% by weight, based on the solution, of furfuryl alcohol; (c) 10-25% by weight, based on the solution, of N-methylpyrrolidone; and wherein water comprises 30-55% by weight of the solution.

Claim 30

An aqueous dispersion, wherein the dispersed phase consists essentially of: (A) 50-55% by weight, based on the weight of (A) plus (B), of a tetrafluoroethylene/hexafluoropropylene copolymer in a comonomer weight ratio range of 75-80/20-25, having a weight average molecular weight, determined by melt viscosity measurements, in excess of 20,000 and its particles having a minimum average dimension of 0.05 micron and a maximum average dimension of 15 microns; and (B) 45-50% by weight, based on the weight of (A) plus (B), of a film-forming material wherein said film-forming material is the non-volatile content of a solution consisting essentially of (a) 25-45% by weight, based on the solution, of a salt of a polyamide acid with tertiary amine, wherein the polyamide acid is formed from trimellitic anhydride and bis(4-aminophenyl)methane and wherein the tertiary amine is a 4:1 to 1:4 by weight mixture of triethylamine and diethyl 2-hydroxyethylamine; (b) 10-20% by weight, based on the solution, of furfuryl alcohol; (c) 10-25% by weight, based on the solution, of N-methylpyrrolidone; and wherein water comprises 30-55% by weight of the solution.

Claim 31

An aqueous dispersion, wherein the dispersed phase consists essentially of: (A) 50-55% by weight, based on the weight of (A) plus (B), of a tetrafluoroethylene/hexafluoropropylene copolymer in a comonomer weight ratio range of 75-80/20-25, having a weight average molecular weight, determined by melt viscosity measurements, in excess of 20,000 and its particles having a minimum average dimension of 0.05 micron and a maximum average dimension of 15 microns; and (B) 45-50% by weight, based on the weight of (A) plus (B), of a film-forming material wherein said film-forming material is the non-volatile content of a solution consisting essentially of (a) 25-45% by weight, based on the solution, of a salt of a polyamide acid with tertiary amine, wherein the polyamide acid is formed from trimellitic anhydride and bis(4-aminophenyl)methane and wherein the tertiary amine is a 4:1 to 1:4 by weight mixture of triethylamine and diethyl 2-hydroxyethylamine; (b) 10-20% by weight, based on the solution, of furfuryl alcohol; (c) 10-25% by weight, based on the solution, of N-methylpyrrolidone; and wherein water comprises 30-55% by weight of the solution.

Claim 32

An aqueous dispersion, wherein the dispersed phase consists essentially of: (A) 20-30% by weight, based on the weight of (A) plus (B), of a perfluoroolefin polymer containing 75 to 100% by weight, based on the perfluoroolefin polymer, of tetrafluoroethylene and 25 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene; and (B) 70-80% by weight, based on the weight of (A) plus (B), of a film-forming material wherein said film-forming material is the non-volatile content of a solution consisting essentially of (a) 25-45% by weight, based on the solution, of a salt of a polyamide acid with tertiary amine, wherein the polyamide acid is formed from trimellitic anhydride and (bis-4-aminophenyl)methane and wherein the tertiary amine is a 4:1 to 1:4 by weight mixture of triethylamine and diethyl 2-hydroxyethylamine; (b) 10-20% by weight, based on the solution, of furfuryl alcohol; (c) 10-25% by weight, based on the solution, of N-methylpyrrolidone; and wherein water comprises 30-55% by weight of the solution.

Claim 33

An aqueous dispersion, wherein the dispersed phase consists essentially of: (A) 20-30% by weight, based on the weight of (A) plus (B), of a perfluoroolefin polymer containing 75 to 100% by weight, based on the perfluoroolefin polymer, of tetrafluoroethylene and 25 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene; and (B) 70-80% by weight, based on the weight of (A) plus (B), of a film-forming material wherein said film-forming material is the non-volatile content of a solution consisting essentially of (a) 25-45% by weight, based on the solution, of a salt of a polyamide acid with tertiary amine, wherein the polyamide acid is formed from trimellitic anhydride and (bis-4-aminophenyl)methane and wherein the tertiary amine is a 4:1 to 1:4 by weight mixture of triethylamine and diethyl 2-hydroxyethylamine; (b) 10-20% by weight, based on the solution, of furfuryl alcohol; (c) 10-25% by weight, based on the solution, of N-methylpyrrolidone; and wherein water comprises 30-55% by weight of the solution.

Claim 34

An aqueous dispersion, wherein the dispersed phase consists essentially of: (A) 20-30% by weight, based on the weight of (A) plus (B), of a perfluoroolefin polymer containing 75 to 100% by weight, based on the perfluoroolefin polymer, of tetrafluoroethylene and 25 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene; and (B) 70-80% by weight, based on the weight of (A) plus (B), of a film-forming material wherein said film-forming material is the non-volatile content of a blend consisting essentially of: (1) a polymeric quaternary hydroxide prepared from: (a) 65-85 parts by weight, based on the weight of components (a) plus (2), of an epoxy resin containing, on the average, two terminal 1,2-epoxy groups per molecule and having a molecular weight of 1,000 to 2,500, reacted with (b) an aqueous solution of 0.75-1.25 equivalents, per equivalent of epoxy group of said epoxy resin of (a), of a tertiary amine selected from the group consisting of: trimethyl amine, dimethyl ethyl amine, diethyl methyl amine, N-methyl pyrrolidine, dimethyl ethanol amine, methyl diethanol amine, ethyl methyl ethanol amine, dimethyl propyl amine, dimethyl 3-hydroxy-1propyl amine, dimethyl 2-hydroxy-1-propyl amine, dimethyl 1-hydroxy-2-propyl amine, and mixtures thereof; and (2) 25-35 parts by weight, based on the weight of components (a) plus (2), of a partially methylated melamine crosslinking agent; wherein (1) and (2) are dissolved or dispersed in water and an organic liquid or mixture of such liquids wherein the water and said organic liquid are in a ratio of from 70:30 to 90:10 and said coating composition having a pH of 10 or above.

Claim 35

An aqueous dispersion, wherein the dispersed phase consists essentially of: (A) 20-30% by weight, based on the weight of (A) plus (B), of a perfluoroolefin polymer containing 75 to 100% by weight, based on the perfluoroolefin polymer, of tetrafluoroethylene and 25 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene; and (B) 70-80% by weight, based on the weight of (A) plus (B), of a film-forming material wherein said film-forming material is the non-volatile content of a blend consisting essentially of: (1) a polymeric quaternary hydroxide prepared from: (a) 65-85 parts by weight, based on the weight of components (a) plus (2), of an epoxy resin containing, on the average, two terminal 1,2-epoxy groups per molecule and having a molecular weight of 1,000 to 2,500, reacted with (b) an aqueous solution of 0.75-1.25 equivalents, per equivalent of epoxy group of said epoxy resin of (a), of a tertiary amine selected from the group consisting of: trimethyl amine, dimethyl ethyl amine, diethyl methyl amine, N-methyl pyrrolidine, dimethyl ethanol amine, methyl diethanol amine, ethyl methyl ethanol amine, dimethyl propyl amine, dimethyl 3-hydroxy-1propyl amine, dimethyl 2-hydroxy-1-propyl amine, dimethyl 1-hydroxy-2-propyl amine, and mixtures thereof; and (2) 25-35 parts by weight, based on the weight of components (a) plus (2), of a partially methylated melamine crosslinking agent; wherein (1) and (2) are dissolved or dispersed in water and an organic liquid or mixture of such liquids wherein the water and said organic liquid are in a ratio of from 70:30 to 90:10 and said coating composition having a pH of 10 or above.