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US 12,173,181 B2Granted
Epoxy-curable silicone release coating composition and methods for its preparation and use
AssigneeDow Silicones Corporation
InventorsYanhu Wei, Zhenbin Niu, Peng-Fei Fu
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Abstract
An epoxy-curable silicone release coating composition and methods for its preparation and use are provided. The composition contains an inhibited Lewis acid catalyst. Releasing the Lewis acid catalyst from the inhibitor allows the Lewis acid to catalyze cure of the epoxy-groups. The composition can be coated on various substrates and cured to form a release liner.
Claims11
An epoxy-curable silicone release coating composition comprising:
- (A) an epoxy-functional polyorganosiloxane comprising unit formula
- (R1R2R3SiO1/2)a(R1SiO3/2)c(SiO4/2)d(ZO1/2)e, where each R1 is independently selected from the group consisting of an alkyl group and an alkyl group functionalized with a cyclic epoxy-functional group, each R2 is an alkyl group, each R3 is an alkyl group, and subscript a>1, subscript c>1, subscript d>1, and e>0, and Mn is >2,000 g/mol to 200,000 g/mol;
- (B) an inhibited catalyst selected from the group consisting of
- (B-1) a complex comprising
- (i) a fluorinated triaryl borane;
- and
- (ii) an amine of formula R4R5R6N, where and where each of R4, R5, and R6 is independently selected from the group consisting of alkyl and substituted alkyl, and each of R4, R5, and R6 is connected to the nitrogen by a non-conjugated carbon;
- and
- (B-2) a Bridged Frustrated Lewis Pair comprising a complex of
- (i) the fluorinated triaryl borane;
- (ii) a Lewis base selected from the group consisting of PR73, P(NR72)3, NR73, N(SiR73)xR73-x, P(N—R7)R73 and
- where each R7 is independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, aryl, and substituted aryl;
- and
- (iii) a bridging molecule connecting the fluorinated triaryl borane and the Lewis base, where the bridging molecule is selected from the group consisting of carbon dioxide, H2, nitriles, alkenes, alkynes, ketones, esters and aldehydes.
11 more elements
A method for preparing the epoxy-curable silicone release coating composition comprising:
- (A) an epoxy-functional polyorganosiloxane comprising unit formula
- (R1R2R3SiO1/2)a(R1 SiO3/2)c(SiO4/2)d(ZO1/2)e, where each R1 is independently selected from the group consisting of an alkyl group and an alkyl group functionalized with a cyclic epoxy-functional group, each R2 is an alkyl group, each R3 is an alkyl group, and subscript a>1, subscript c>1, subscript d>1, and e>0, and Mn is >2,000 g/mol to 200,000 g/mol;
- (B) an inhibited catalyst selected from the group consisting of
- (B-1) a complex comprising
- (i) a fluorinated triaryl borane;
- and
- (ii) an amine of formula R4R5R6N, where, and where each of R4, R5, and R6 is independently selected from the group consisting of alkyl, and substituted alkyl, and each of R4, R5, and R6 is connected to the nitrogen by a non-conjugated carbon;
- and
- (B-2) a Bridged Frustrated Lewis Pair comprising a complex of
- (i) the fluorinated triaryl borane;
- (ii) a Lewis base selected from the group consisting of PR73, P(NR72)3, NR73, N(SiR73)xR73-x, P(N—R7)R73 and
- where each R7 is independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, aryl, and substituted aryl;
- and
- (iii) a bridging molecule connecting the fluorinated triaryl borane and the Lewis base, where the bridging molecule is selected from the group consisting of carbon dioxide, H2, nitriles, alkenes, alkynes, ketones, esters and aldehydes, where the method comprises mixing, under ambient conditions, starting materials comprising (A) and (B).
11 more elements
Dependencies are inferred from the claim text.