Gasket having polysiloxane sealant layer containing organotitanate

Claim 2

A gasket comprising a base sheet and a sealant layer strongly adhered thereto having increased resistance to delamination, said sealant layer comprising a polymerized, solid organopolysiloxane having an organotitanate dispersed substantially throughout said organopolysiloxane, said organotitanate serving to retard the rate of polymerization of said organopolysiloxane to said solid state to provide a longer pot life and to couple said organopolysiloxane to said base sheet and provide said strong adherence.

Claim 3

The gasket of claim 1 in which said base sheet is a metallic sheet.

Claim 4

The gasket of claim 1 in which said base sheet is a bonded fibrous layer.

Claim 5

The gasket of claim 1 in which said organopolysiloxane is polymerized from a liquid organopolysiloxane having the formula: ##STR3## in which R 1 and R 2 are monovalent substituents which may be the same or different and are selected from hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, vinyl, allyl, phenyl, methyl phenyl, ethyl phenyl, propyl phenyl, isopropyl phenyl, butyl phenyl, isobutyl phenyl, tolyl, and xylyl, provided that not more than half of said R 2 substituents are hydrogen, and n is a number sufficiently low to provide the liquid state.

Claim 6

The gasket of claim 4 in which the R 2 substituents are methyl and phenyl, and the mole ratio of methyl to phenyl varies from about 1 to about 10.

Claim 7

The gasket of claim 1 in which said polymerized organopolysiloxane is a cross-linked elastomeric organopolysiloxane.

Claim 8

The gasket of claim 1 in which said polymerized organopolysiloxane is a polyalkylphenyl siloxane, said alkyl group being selected from methyl, ethyl, propyl, isopropyl, butyl, and isobutyl.

Claim 9

The gasket of claim 1 in which said polymerized organopolysiloxane contains at least 10 mole percent of the phenyl radical and is cross-linked at least at some of its substituents.

Claim 10

The gasket of claim 1 in which said polymerized organopolysiloxane is polymethylphenylsiloxane.

Claim 11

The gasket of claim 1 in which said polymerized organopolysiloxane contains from about 0.1% to about 4% by weight of said organotitanate.

Claim 12

The gasket of claim 1 in which said organotitanate corresponds to the formula: Ti(OR.sub.3).sub.4 in which R 3 is a monovalent substituent which may be the same or different and is selected from alkyl and cycloalkyl from 1 to about 10 carbon atoms, alkenyl from 2 to about 4 carbon atoms, aliphatic acyl of 2 to about 8 carbon atoms, amido up to about 6 carbon atoms, benzyl, and hydrogen, provided that not all R 3 's are hydrogen.

Claim 13

The gasket of claim 1 in which said organotitanate is a tetraester of orthotitanic acid corresponding to the formula: Ti(OR.sub.3).sub.4 in which R 3 is a monovalent substituent which may be the same or different and is selected from alkyl and cycloalkyl from 1 to about 10 carbon atoms, alkenyl from 2 to about 4 carbon atoms, aliphatic acyl of 2 to about 8 carbon atoms, amido of up to about 6 carbon atoms, and benzyl.

Claim 14

The gasket of claim 1 in which said organotitanate is tetrabutyl titanate.

Claim 15

The gasket of claim 1 in which said organotitanate is tetraacetylacetonyl.

Claim 16

A process for preparing a gasket having a sealant layer adapted to form a seal for fluids comprising applying a layer to a base sheet of a rection mix comprising a polymerizable organopolysiloxane and an adherent amount of an organotitanate, heating said layer to polymerize the organopolysiloxane to a solid form and adhere it to said base sheet, retarding the polymerization rate of said polymerizable organopolysiloxane by said organotitanate, and improving the adherence of said organopolysiloxane to said base sheet by said organotitanate.

Claim 17

A process for preparing a gasket having a sealant layer adapted to form a seal for fluids comprising applying a layer to a base sheet of a rection mix comprising a polymerizable organopolysiloxane and an adherent amount of an organotitanate, heating said layer to polymerize the organopolysiloxane to a solid form and adhere it to said base sheet, retarding the polymerization rate of said polymerizable organopolysiloxane by said organotitanate, and improving the adherence of said organopolysiloxane to said base sheet by said organotitanate.

Claim 18

The process of claim 15 in which said polymerizable organopolysiloxane has the formula: ##STR4## in which R 1 and R 2 are monovalent substituents which may be the same or different and are selected from hydrogen, methyl, ethyl, propy, isopropyl, butyl, isobutyl, vinyl, allyl, phenyl, methyl phenyl, ethyl phenyl, propyl phenyl, isopropyl phenyl, butyl phenyl, isobutyl phenyl, tolyl, and xylyl, provided that not more than about half of the R 2 substituents are hydrogen, and n is a number sufficiently low to provide the liquid state.

Claim 19

The process of claim 16 in which the R 2 substituents are methyl and phenyl, and the mole ratio of methyl to phneyl varies from 1 to about 10.

Claim 20

The process of claim 15 in which said polymerizable organopolysiloxane is a polyalkylphenyl siloxane, said alkyl group being selected from methyl, ethyl, propyl, isopropyl, butyl, and isobutyl.

Claim 21

The process of claim 15 in which said polymerizable organopolysiloxane contains at least 10 mole percent of the phenyl radical and is cross-linked at least at some of its substituents.

Claim 22

The process of claim 15 in which said polymerizable organopolysiloxane is polymethylphenylsiloxane.

Claim 23

The process of claim 15 in which said polymerizable organopolysiloxane contains from 0.1% to about 4% by weight of said organotitanate.

Claim 24

The process of claim 15 in which said organotitanate corresponds to the formula: Ti(OR.sub.3).sub.4 in which R 3 is a monovalent substituent which may be the same or different and is selected from alkyl and cycloalkyl from 1 to about 10 carbon atoms, alkenyl from 2 to about 4 carbon atoms, aliphatic acyl of 2 to about 8 carbon atoms, amido of up to about 6 carbon atoms, benzyl, and hydrogen, provided that not all R 3 's are hydrogen.

Claim 25

The process of claim 15 in which said organotitanate is a tetraester of orthotitanic acid corresponding to the formula: Ti(OR.sub.3).sub.4 in which R 3 is a monovalent substituent which may be the same or different and is selected from alkyl and cycloalkyl from 1 to about 10 carbon atoms, alkenyl from 2 to about 4 carbon atoms, aliphatic acyl of 2 to about 8 carbon atoms, amido of up to about 6 carbon atoms, and benzyl.

Claim 26

The process of claim 15 in which said organotitanate is tetrabutyl titanate.

Claim 27

The process of claim 15 in which said organotitanate is tetraacetylacetonyl.

Claim 28

A gasket comprising a base sheet and a sealant layer strongly adhered to at least one face of the base sheet having increased resistance to delamination, said sealant layer comprising: (a) a polymerized, cross-linked organopolysiloxane polymerized from a liquid organopolysiloxane having the formula: ##STR5## in which R 1 and R 2 are monovalent substituents which may be the same or different and are selected from hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, vinyl, allyl, phenyl, methyl phenyl, ethyl phenyl, propyl phenyl, isopropyl phenyl, butyl phenyl, isobutyl phenyl, tolyl, and xylyl, provided that not more than about half of the R 2 substituents are hydrogen, and n is a number sufficiently low to provide the liquid state and (b) from about 0.1% to about 4% by weight of the organopolysiloxane of an organotitanate adapted to retard the rate of polymerization of said organopolysiloxane to said solid state to provide a longer pot life, and to couple said polysiloxane to said base sheet and provide said strong adherence, said organotitanate corresponding to the formula: Ti(OR.sub.3).sub.4 in which R 3 is a monovalent substituent which may be the same or different and is selected from alkyl and cycloalkyl from one to about 10 carbon atoms, alkenyl from two to about four carbon atoms, aliphatic acyl of two to about eight carbon atoms, amido up to about six carbon atoms, benzyl, and hydrogen, provided that not all R 3 's are hydrogen.

Claim 29

A gasket comprising a base sheet and a sealant layer strongly adhered to at least one face of the base sheet having increased resistance to delamination, said sealant layer comprising: (a) a polymerized, cross-linked organopolysiloxane polymerized from a liquid organopolysiloxane having the formula: ##STR5## in which R 1 and R 2 are monovalent substituents which may be the same or different and are selected from hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, vinyl, allyl, phenyl, methyl phenyl, ethyl phenyl, propyl phenyl, isopropyl phenyl, butyl phenyl, isobutyl phenyl, tolyl, and xylyl, provided that not more than about half of the R 2 substituents are hydrogen, and n is a number sufficiently low to provide the liquid state and (b) from about 0.1% to about 4% by weight of the organopolysiloxane of an organotitanate adapted to retard the rate of polymerization of said organopolysiloxane to said solid state to provide a longer pot life, and to couple said polysiloxane to said base sheet and provide said strong adherence, said organotitanate corresponding to the formula: Ti(OR.sub.3).sub.4 in which R 3 is a monovalent substituent which may be the same or different and is selected from alkyl and cycloalkyl from one to about 10 carbon atoms, alkenyl from two to about four carbon atoms, aliphatic acyl of two to about eight carbon atoms, amido up to about six carbon atoms, benzyl, and hydrogen, provided that not all R 3 's are hydrogen.