Metal substrates with carboxyfunctional siloxane release coatings

Claim 2

A metal substrate having on the surface thereof, in an amount sufficient to improve the release characteristics of said substrate, a composition consisting essentially of (1) from 1 to 99 percent by weight of a siloxane fluid having the general formula (CH 3 ) 3 SiO[(CH 3 ) 2 SiO] x Si(CH 3 ) 3 wherein x is an integer, and (2) from 1 to 99 percent by weight of a siloxane composed essentially of from 0.1 to 50 mole percent of R a R' b SiO.sub.(4-a-b)/2 units and from 50 to 99.9 mole percent of R" c SiO.sub.(4-c)/2 units wherein R is a carboxyfunctional radical, a has an average value from 1 to 3, R' is a hydrocarbon or halogenated hydrocarbon radical, b has an average value from 0 to 2, the sum of a + b is from 1 to 3, R" is a hydrocarbon or halogenated hydrocarbon radical, and P1 c has an average value from 0 to 3.

Claim 3

A metal substrate as defined in claim 1 wherein (1) has a viscosity in the range of 100 to 100,000 centistokes at 25° C. and (2) constitutes at least 50 percent by weight of the composition.

Claim 4

In a process of treating a metal substrate to improve the release characteristics thereof, said process including the step of applying a substance to the metal substrate which substance enhances the release characteristics of said substrate, the improvement comprising applying to the metal substrate as the substance which enhances the release characteristics a composition consisting essentially of (1) from 1 to 99 percent by weight of a siloxane fluid having the general formula (CH 3 ) 3 SiO[(CH 3 ) 2 SiO] x Si(CH 3 3 ) wherein x is an integer, and (2) from 1 to 99 percent by weight of a siloxane composed essentially of from 0.1 to 50 mole percent of R a R' b SiO.sub. (4-a-b)/2 units and from 50 to 99.9 mole percent of R" c SiO.sub. (4-c)/2 units wherein R is a carboxyfunctional radical, a has an average value from 1 to 3, R' is a hydrocarbon or halogenated hydrocarbon radical, b has an average value from 0 to 2, the sum of a + b is from 1 to 3, R" is a hydrocarbon or halogenated hydrocarbon radical, and c has an average value from 0 to 3.

Claim 5

In a process of treating a metal substrate to improve the release characteristics thereof, said process including the step of applying a substance to the metal substrate which substance enhances the release characteristics of said substrate, the improvement comprising applying to the metal substrate as the substance which enhances the release characteristics a composition consisting essentially of (1) from 1 to 99 percent by weight of a siloxane fluid having the general formula (CH 3 ) 3 SiO[(CH 3 ) 2 SiO] x Si(CH 3 3 ) wherein x is an integer, and (2) from 1 to 99 percent by weight of a siloxane composed essentially of from 0.1 to 50 mole percent of R a R' b SiO.sub. (4-a-b)/2 units and from 50 to 99.9 mole percent of R" c SiO.sub. (4-c)/2 units wherein R is a carboxyfunctional radical, a has an average value from 1 to 3, R' is a hydrocarbon or halogenated hydrocarbon radical, b has an average value from 0 to 2, the sum of a + b is from 1 to 3, R" is a hydrocarbon or halogenated hydrocarbon radical, and c has an average value from 0 to 3.