Conductors having insulation of polyester imide resin

Claim 2

Method of coating wire with electrically insulating enamel which comprises passing the wire through an enameling lacquer comprising a resin for forming the enamel and a cresol type solvent, to coat the wire with a film of the enameling lacquer, and thereafter heating the coated wire to cure the resin and drive off the solvent, said resin being a polyester imide resin having ester groups of acid and alcohol moieties in the chain which are condensation products of at least difunctional carboxylic acid or a derivative thereof which is a functionally active equivalent, and at least difunctional alcohol or a derivative thereof which is a functionally active equivalent, and, between said ester groups, an amount effective to improve the thermal stability of the resin without rendering the resin insoluble to the extent which would make it unsuitable for use in a wire lacquer composed of the resin dissolved in cresol and solvent naphtha, of moieties containing a 5-membered imide ring and which are condensation products of an aromatic carboxylic acid anhydride containing a 5-membered cyclic carboxylic acid anhydride group or a derivative thereof which is a functionally active equivalent and at least one additional reactable group, and a primary aromatic amine or a derivative thereof which is a functionally active equivalent, containing at least one additional reactable group.

Claim 3

Method according to claim 1, said additional reactable group of the anhydride being carboxyl, carboxylic acid anhydride, or hydroxyl.

Claim 4

Method according to claim 1, said additional reactable group of the amine being carboxyl, hydroxyl or primary amino.

Claim 5

Method according to claim 2, said additional reactable group of the amine being carboxyl, hydroxyl or primary amino.

Claim 6

Method according to claim 1, said alcohol moieties including residues of ehtylene glycol.

Claim 7

Method according to claim 1, said alcohol moieties including residues of glycerine.

Claim 8

Method according to claim 5, said alcohol moieties including residues of glycerine.

Claim 9

Method according to claim 1, the percentage of imide groups based on the sum of ester and imide groups being 9.4-50%.

Claim 10

Method according to claim 1, the additional reactable group of the aromatic carboxylic acid anhydride being a carboxyl group.

Claim 11

Method according to claim 1, the additional reactable group of the aromatic carboxylic acid anhydride being an anhydride group.

Claim 12

Method according to claim 1, the additional reactable group of the aromatic carboxylic acid anhydride being a hydroxyl group.

Claim 13

Method according to claim 1, the additional reactable group of the amine being a carboxyl group.

Claim 14

Method according to claim 1, the additional reactable group of the amine being a hydroxyl group.

Claim 15

Method according to claim 1, the additional reactable group of the amine being a primary amino group.

Claim 16

Method according to claim 1, said aromatic carboxylic anhydride being trimellitic acid anhydride, pyromellitic acid anhydride or dianhydride of tetracarboxylic acid having two benzene nucleii in the molecule.

Claim 17

Method according to claim 1, said aromatic carboxylic acid anhydride being trimellitic acid anhydride, said aromatic amine being a diprimary aromatic amine, said anhydride and amine being in the proportion of 2:1, anhydride:amine.

Claim 18

Method according to claim 1, said aromatic carboxylic acid anhydride being trimellitic acid anhydride, said aromatic amine being a primary amino carboxylic acid, said anhydride and amine being in the proportion of 1:1.

Claim 19

Method according to claim 1, said aromatic carboxylic acid anhydride being a tetracarboxylic acid dianhydride, said aromatic amine being a primary amino carboxylic acid, said anhydride and amine being used in the proportion of 1:2, anhydride:amine.

Claim 20

Method according to claim 1, said aromatic carboxylic acid anhydride and aromatic amine being, respectively: trimellitic acid anhydride, and 4,4'-diaminodiphenylmethane in the proportion of anhdride to amine of 2:1.

Claim 21

Method according to claim 1, said aromatic carboxylic acid anhydride and aromatic amine being, respectively: trimellitic acid anhydride, and p-amino benzoic acid in the proportion of anhydride to amine of 1:1.

Claim 22

Method according to claim 1, (a) said aromatic carboxylic acid anhydride being pyromellitic acid anhydride, trimellitic acid anhydride or dianhydride of tetracarboxylic acid having two benzene nucleii in the molecule, (b) said primary aromatic amine benzidine, diaminodiphenylmethane, diaminodiphenylketone, diaminodiphenylsulfone, diaminodiphenylsulfoxide, diaminodiphenylether, diaminodiphenylthioether, phenylenediamine, toluylenediamine, xylylenediamine, bis-(4-aminophenyl)-α,α'-p-xylol, bis-(4-aminophenoxy)-1,4-benzene, or amino-benzoic acids.

Claim 23

An insulated electrical wire conductor comprising in combination, an electrical wire conductor and a cured polyester imide resin coating said electrical conductor said polyester imide resin having ester groups of acid and alcohol moieties in the chain which are condensation products of at least difunctional carboxylic acid or a derivative thereof which is a functionally active equivalent, and at least difunctional alcohol or a derivative thereof which is a functionally active equivalent, and, between said ester groups, an amount effective to improve the thermal stability of the resin without rendering the resin insoluble to the extent which would make it unsuitable for use in a wire lacquer composed of the resin dissolved in cresol and solvent naphtha, of moieties containing a 5-membered imide ring and which are condensation products of an aromatic carboxylic acid anhydride containing a 5-membered cyclic carboxylic acid anhydride group or a derivative thereof which is a functionally active equivalent and at least one additional reactable group, and a primary aromatic amine or a derivative thereof which is a functionally active equivalent, containing at least one additional reactable group.

Claim 24

An insulated electrical wire conductor comprising in combination, an electrical wire conductor and a cured polyester imide resin coating said electrical conductor said polyester imide resin having ester groups of acid and alcohol moieties in the chain which are condensation products of at least difunctional carboxylic acid or a derivative thereof which is a functionally active equivalent, and at least difunctional alcohol or a derivative thereof which is a functionally active equivalent, and, between said ester groups, an amount effective to improve the thermal stability of the resin without rendering the resin insoluble to the extent which would make it unsuitable for use in a wire lacquer composed of the resin dissolved in cresol and solvent naphtha, of moieties containing a 5-membered imide ring and which are condensation products of an aromatic carboxylic acid anhydride containing a 5-membered cyclic carboxylic acid anhydride group or a derivative thereof which is a functionally active equivalent and at least one additional reactable group, and a primary aromatic amine or a derivative thereof which is a functionally active equivalent, containing at least one additional reactable group.

Claim 25

Insulated electrical conductor according to claim 22, said additional reactable group of the anhydride being carboxyl, carboxylic acid anhydride, or hydroxyl.

Claim 26

Insulated electrical conductor according to claim 22, said additional reactable group of the amine being carboxyl, hydroxyl or primary amino.

Claim 27

Insulated electrical conductor according to claim 23, said additional reactable group of the amine being carboxyl, hydroxyl or primary amino.

Claim 28

Insulated electrical conductor according to claim 22, said alcohol moieties including residues of ethylene glycol.

Claim 29

Insulated electrical conductor according to claim 22, said alcohol moieties including residues of glycerine.

Claim 30

Insulated electrical conductor according to claim 26, said alcohol moieties including residues of glycerine.

Claim 31

Insulated electrical conductor according to claim 22, the percentage of imide groups based on the sum of ester and groups being 9.4-50%.

Claim 32

Insulated electrical conductor according to claim 22, the additional reactable group of the aromatic carboxylic acid anhydride being a carboxyl group.

Claim 33

Insulated electrical conductor according to claim 22, the additional reactable group of the aromatic carboxylic acid anhydride being an anhydride group.

Claim 34

Insulated electrical conductor according to claim 22, the additional reactable group of the aromatic carboxylic acid anhydride being a hydroxyl group.

Claim 35

Insulated electrical conductor according to claim 22, the additional reactable group of the amine being a carboxyl group.

Claim 36

Insulated electrical conductor according to claim 22, the additional reactable group of the amine being a hydroxyl group.

Claim 37

Insulated electrical conductor according to claim 22, the additional reactable group of the amine being a primary amino group.

Claim 38

Insulated electrical conductor according to claim 22, said aromatic carboxylic anhydride being trimellitic acid anhydride, pyromellitic acid anhydride or dianhydride of tetracarboxylic acid having two benzen nucleii in the molecule.

Claim 39

Insulated electrical conductor according to claim 22, said aromatic carboxylic acid anhydride being trimellitic acid anhydride, said aromatic amine being a diprimary aromatic amine, said anhydride and amine being in the proportion of 2:1, anhydride:amine.

Claim 40

Insulated electrical conductor according to claim 22, said aromatic carboxylic acid anhydride being trimellitic acid anhydride, said aromatic amine being a primary amino carboxylic acid, said anhydride and amine being in the proportion of 1:1.

Claim 41

Insulated electrical conductor according to claim 22, said aromatic carboxylic acid anhydride being a tetracarboxylic acid dianhydride, said aromatic amine being a primary amino carboxylic acid, said anhydride and amine being used in the proportion of 1:2, anhydride:amine.

Claim 42

Insulated electrical conductor according to claim 22, said aromatic carboxylic acid anhydride and aromatic amine being, respectively: trimellitic acid anhydride, and 4,4'-diaminodiphenylmethane in the proportion of anhydride to amine of 2:1.

Claim 43

Insulated electrical conductor according to claim 22, said aromatic carboxylic acid anhydride and aromatic amine being, respectively: trimellitic acid anhydride, and p-amino benzoic acid in the proportion of anhydride to amine of 1:1.

Claim 44

Insulated electrical conductor according to claim 22, (a) said aromatic carboxylic acid anhydride being pyromellitic acid anhydride, trimellitic acid anhydride or dianhydride of tetracarboxylic acid having two benzene nucleii in the molecule, (b) said primary aromatic amine benzidine, diaminodiphenylmethane, diaminodiphenylketone, diaminodiphenylsulfone, diaminodiphenylsulfoxide, diaminodiphenylether, diaminodiphenylthioether, phenylenediamine, toluylenediamine, xylylenediamine, bis-(4-aminophenyl)-α,α'-p-xylol, bis-(4-aminophenoxy)-1,4-benzene, or amino-benzoic acids.

Claim 45

Method of coating an electrical conductor with electrically insulating enamel which comprises passing the conductor through an enameling lacquer comprising a resin for forming the enamel and a cresol type solvent to coat the conductor with a film of the enameling lacquer, and thereafter heating the coated conductor to cure the resin and drive off the solvent, said resin being a polyester imide resin having ester groups of acid and alcohol moieties in the chain which are condensation products of at least difunctional carboxylic acid or a derivative thereof which is a functionally active equivalent, and at least difunctional alcohol or a derivative thereof which is a functionally active equivalent, and including alcohol having only two functional groups or a derivative thereof which is a functionally active equivalent, and, between said ester groups an amount effective to improve the thermal stability of the resin without rendering the resin insoluble to the extent which would make it unsuitable for use in a wire lacquer composed of the resin dissolved in cresol and solvent naphtha, of moieties containing a 5-membered imide ring and which are condensation products of an aromatic carboxylic acid anhydride containing a 5-membered cyclic carboxylic acid anhydride group or a derivative thereof which is a functionally active equivalent and at least one additional reactable group, and a primary amine or a derivative thereof which is a functionally active equivalent, containing at least one additional reactable group.

Claim 46

Method of coating an electrical conductor with electrically insulating enamel which comprises passing the conductor through an enameling lacquer comprising a resin for forming the enamel and a cresol type solvent to coat the conductor with a film of the enameling lacquer, and thereafter heating the coated conductor to cure the resin and drive off the solvent, said resin being a polyester imide resin having ester groups of acid and alcohol moieties in the chain which are condensation products of at least difunctional carboxylic acid or a derivative thereof which is a functionally active equivalent, and at least difunctional alcohol or a derivative thereof which is a functionally active equivalent, and including alcohol having only two functional groups or a derivative thereof which is a functionally active equivalent, and, between said ester groups an amount effective to improve the thermal stability of the resin without rendering the resin insoluble to the extent which would make it unsuitable for use in a wire lacquer composed of the resin dissolved in cresol and solvent naphtha, of moieties containing a 5-membered imide ring and which are condensation products of an aromatic carboxylic acid anhydride containing a 5-membered cyclic carboxylic acid anhydride group or a derivative thereof which is a functionally active equivalent and at least one additional reactable group, and a primary amine or a derivative thereof which is a functionally active equivalent, containing at least one additional reactable group.

Claim 47

Method of claim 43, the alcohol moieties including residues of polyhydric alcohols having more than two hydroxy groups.

Claim 48

Method of claim 44, said alcohol moieties including residues of ethylene glycol.

Claim 49

Method of claim 43, the alcohol moieties including residues of polyhydric alcohols having three hydroxy groups.

Claim 50

Method of claim 43, the alcohol moieties including residues of glycerine.

Claim 51

Method of claim 43, said alcohol moieties including residues of ethylene glycol.

Claim 52

Method of claim 48, said alcohol moieties including residues of alcohols having three hydroxy groups.

Claim 53

An insulated electrical conductor comprising in combination, an electrical conductor and a cured polyester imide resin coating said electrical conductor, said polyester imide resin having ester groups of acid and alcohol moieties in the chain which are condensation products of at least difunctional carboxylic acid or a derivative thereof which is a functionally active equivalent, and at least difunctional alcohol or a derivative thereof which is a functionally active equivalent, and including alcohol having only two functional groups or a derivative thereof which is a functionally active equivalent, and alcohol having more than two functional groups or a derivative thereof which is a functionally active equivalent, and between said ester groups, moieties containing a 5-membered imide ring and which are condensation products of an aromatic carboxylic acid anhydride containing a 5-membered cyclic carboxylic acid anhydride group or a derivative thereof which is a functionally active equivalent and at least one additional reactable group, and a primary amine or a derivative thereof which is a functionally active equivalent, containing at least one additional reactable group.

Claim 54

An insulated electrical conductor comprising in combination, an electrical conductor and a cured polyester imide resin coating said electrical conductor, said polyester imide resin having ester groups of acid and alcohol moieties in the chain which are condensation products of at least difunctional carboxylic acid or a derivative thereof which is a functionally active equivalent, and at least difunctional alcohol or a derivative thereof which is a functionally active equivalent, and including alcohol having only two functional groups or a derivative thereof which is a functionally active equivalent, and alcohol having more than two functional groups or a derivative thereof which is a functionally active equivalent, and between said ester groups, moieties containing a 5-membered imide ring and which are condensation products of an aromatic carboxylic acid anhydride containing a 5-membered cyclic carboxylic acid anhydride group or a derivative thereof which is a functionally active equivalent and at least one additional reactable group, and a primary amine or a derivative thereof which is a functionally active equivalent, containing at least one additional reactable group.

Claim 55

Conductor of claim 50, said alcohol moieties including residues of ethylene glycol.

Claim 56

Conductor of claim 50, said alcohol moieties including residues of polyhydric alcohols having three hydroxy groups.

Claim 57

Conductor of claim 52, said alcohol moieties including residues of ethylene glycol.

Claim 58

Conductor of claim 50, said alcohol moieties including residues of alcohols having three hydroxy groups.

Claim 59

Conductor of claim 54, said alcohol moieties including residues of glycerine.