Release modifier composition
View Patent ↗There is described a release composition including a polyorganosiloxane polymer and a release modifier. The release modifier includes comprising an alkenyl silsesquioxane an organo functional siloxane of the formula MD x M, wherein M represents R 3 SiO 1/2 , D represents R 2 SiO 2/2 , wherein R is alkyl or alkenyl of 1 to 40 carbon atoms, or hydrogen wherein the organo functional siloxane has a viscosity of from about 5 centipoises to about 80 centipoises and x is from about 5 to about 80, and an optionally a reactive diluent. The release composition includes at least one siloxane cross-linking agent, an inhibitor; and a hydrosilation catalyst.
1. A release composition comprising:
a polyorganosiloxane polymer represented by:
M vi a T b D c M d
where M vi =R 3-p R 1 p SiO 1/2 , where R is selected from the group consisting of one to forty carbon monovalent hydrocarbon radicals, R 1 is selected from the group consisting of two to forty carbon atom olefinic monovalent hydrocarbon radicals, p ranges from 1 to 3; T=R 2 SiO 3/2 where R 2 is selected from the group consisting of R and R 1 ; D=R 3 R 4 SiO 2/2 where R 3 and R 4 are each independently selected from the group consisting of R and R 1 ; and M=R 3 SiO 1/2 where each R is independently selected, and the subscripts a and b have values ranging from about 2 to about 5 and c is an integer ranging from about 50 to about 1,000 and d has a value ranging from 0 to 0.5, wherein the polyorganosiloxane polymer comprises from about 10 weight percent to about 90 weight percent of the release composition;
a release modifier comprising:
i) an alkenyl silsesquioxane,
ii) an organo functional siloxane of the formula MD x M, wherein M represents R 5 3 SiO 1/2 , D represents R 5 2 SiO 2/2 , wherein R 5 is alkyl or alkenyl of 1 to 40 carbon atoms, or hydrogen wherein the organo functional siloxane has a viscosity of from about 5 centipoises to about 80 centipoises and x is from about 5 to about 80, and
iii) optionally a reactive diluent
at least one siloxane cross-linking agent;
an inhibitor; and
a hydrosilation catalyst.
2. The release composition according to claim 1 , wherein the release modifier further comprises dimethylsiloxane-methylhydrogensiloxane or polymethylhydrogensiloxane.
3. The release composition according to claim 1 , wherein the siloxane cross-linking agent comprises SiH-containing polyorganosiloxanes.
4. The release composition according to claim 1 , wherein the hydrosilation catalyst is metal selected from the group consisting of: nickel, palladium, platinum, rhodium, iridium, ruthenium and osmium.
5. The release composition according to claim 1 , wherein the cross-linking agent comprises a substantially linear hydrogen siloxane selected from the group of consisting of:
MD e D′ f M
MD′ f M
MD e D′ f M′
M′D e D′ f M′, and
MD e M′
where M is R 3 SiO 1/2
M′ is H g R 3-g SiO 1/2 ;
D is RRSiO 2/2 where each R is independently selected, and
D′ is RHSiO 2/2
where R is selected from the group consisting of one to forty carbon monovalent hydrocarbon radicals, the subscripts e and f may be zero or positive wherein the sum of e and f ranges from about 10 to about 100 subject to the limitation that the sum off and g is two or greater.
6. The release composition according to claim 1 , wherein the inhibitor is selected from the group consisting of: ethylenically unsaturated amides, aromatically unsaturated amides, acetylenic compounds, ethylenically unsaturated isocyanates, olefinic siloxanes, unsaturated hydrocarbon diesters unsaturated hydrocarbon monoesters of unsaturated acids, conjugated ene-ynes, hydroperoxides, ketones, sulfoxides, amines, phosphines, phosphites, nitrites, and diaziridines.
7. The release composition according to claim 1 , wherein the optional reactive diluent is selected from the group consisting of: α-olefins and vinyl ethers.
8. A multi-layered product comprising: (a) a release sheet comprising (i) a carrier and a release film and (ii) an adhesive sheet comprising a carrier and an adhesive film, wherein said release film is formed of the composition of claim 1 , and wherein said release film is in contact with the adhesive film.
9. A substrate, comprising the composition according to claim 1 disposed on a surface of the substrate and cured.
10. A process for coating a substrate, comprising (a) applying the composition according to claim 1 onto the surface of the substrate, and (b) curing said composition on the surface of the substrate.
11. A process of coating a substrate, comprising applying to the substrate the composition of claim 1 .
12. A process of preparing release films, comprising applying to a substrate to be released, the composition of claim 1 .
13. A release composition comprising:
a polyorganosiloxane polymer represented by:
M vi a T b D c M d
where M vi =R 3-p R 1 p SiO 1/2 , where R is selected from the group consisting of one to forty carbon monovalent hydrocarbon radicals, R 1 is selected from the group consisting of two to forty carbon atom olefinic monovalent hydrocarbon radicals, p ranges from 1 to 3; T=R 2 SiO 3/2 where R 2 is selected from the group consisting of R and R 1 ; D=R 3 R 4 SiO 2/2 where R 3 and R 4 are each independently selected from the group consisting of R and R 1 ; and M=R 3 SiO 1/2 where each R is independently selected, and the subscripts a and b have values ranging from about 2 to about 5 and c is an integer ranging from about 50 to about 1,000 and d has a value ranging from 0 to 0.5;
a release modifier comprising:
i) an alkenyl silsesquioxane,
ii) an organo functional siloxane of the formula MD x M, wherein M represents R 5 3 SiO 1/2 , D represents R 5 2 SiO 2/2 , wherein R 5 is alkyl or alkenyl of 1 to 40 carbon atoms, or hydrogen wherein the organo functional siloxane has a viscosity of from about 5 centipoises to about 80 centipoises or wherein x is from about 5 to about 80, and
iii) a reactive diluent
at least one siloxane cross-linking agent;
an inhibitor; and
a hydrosilation catalyst.
14. The release composition according to claim 13 , wherein the hydrosilation catalyst is metal selected from the group consisting of: nickel, palladium, platinum, rhodium, iridium, ruthenium and osmium.
15. The release composition according to claim 13 , wherein the optional reactive diluent is selected from the group consisting of: α-olefins and vinyl ethers.
16. The release composition according to claim 13 , wherein the release modifier further comprises dimethylsiloxane-methylhydrogensiloxane or polymethylhydrogensiloxane.