US 11,952,516 B2Granted

Addition curable silicone adhesive compositions

AssigneeMomentive Performance Materials Inc.

InventorsSubrata Mandal, Manav Gupta, Koki Otashiro

Life of this patent

Estimating the term…

Abstract

A curable silicone adhesive composition comprising adhesion promoter is shown and described herein. The adhesion promoter is a silicon hydride material containing an aromatic based skeleton with another adhesion promoter to provide a silicone material that is curable at relatively low temperatures and shorter time and provides good adhesion to plastics and metal.

Claims22

Dependent claims

A curable silicone composition comprising:

(a) an alkenyl functional silicone;
(b) a silicone hydride cross linker;
(c) a filler;
(d) a first adhesion promoter;
(e) a second adhesion promoter;
(f) optionally, a silane;
(g) optionally an inhibitor;
and (h) optionally a catalyst;
wherein the first adhesion promoter is chosen from a compound of the formula Z1—R1—O—Ar—O—R2—Z2 where R1 and R2 are a C1-C30 divalent hydrocarbon;
a C2-C20 divalent hydrocarbon;
a C4-C10 divalent hydrocarbon;
or a C1-C4 divalent hydrocarbon;
Z1 and Z2 are independently:
provided that at least one of Z1 and Z2 is
where R3, R4, R5, R6, R7, R8, R9, and R10 are independently chosen from H, a C1-C10 alkyl, or —OR11, where R11 is a C1-C10 alkyl, and at least one of R3, R4, R5, R6, R7, R8, R9, and/or R10 are H;
x is 1 to 10;
y is 2 to 10;
and
Ar is an aromatic group;
wherein the second adhesion promoter is chosen from one or more compounds of the formula R47—SiR48r(OR49)3-r where R47 is a cyclic hydrido siloxane containing group of the formula:
R48 is independently selected from a C1-C10 hydrocarbon group;
each R49 is independently selected from a C1-C10 hydrocarbon;
r is 0, 1, or 2:
R51, R52, and R53 are independently chosen from H, a C1-C10 alkyl, or —OR54, where R54 is a C1-C10 alkyl, and at least one of R51, R52, and R53 are H;
and R50 is an organosilicon group having a side chain bonded to a silicon atom and represented by the following formula
Q1-C(O)—O-Q2
wherein Q1 represents a linear or branched alkylene group that forms a carbon chain having two or more carbon atoms between a silicon atom in R47 and an ester bond, and Q2 represents a linear or branched alkylene group that forms a carbon chain having three or more carbon atoms between an oxygen atom and a silicon atom in SiR48r(OR49)3-r;
and
wherein the first adhesion promoter and the second adhesion promoter are included in the curable silicone composition in different amounts by weight.

26 more elements

Dependencies are inferred from the claim text.

patentgrep

Loading patent…

Abstract

A curable silicone composition comprising:

(a) an alkenyl functional silicone;
(b) a silicone hydride cross linker;
(c) a filler;
(d) a first adhesion promoter;
(e) a second adhesion promoter;
(f) optionally, a silane;
(g) optionally an inhibitor;
and (h) optionally a catalyst;
wherein the first adhesion promoter is chosen from a compound of the formula Z1—R1—O—Ar—O—R2—Z2 where R1 and R2 are a C1-C30 divalent hydrocarbon;
a C2-C20 divalent hydrocarbon;
a C4-C10 divalent hydrocarbon;
or a C1-C4 divalent hydrocarbon;
Z1 and Z2 are independently:
provided that at least one of Z1 and Z2 is
where R3, R4, R5, R6, R7, R8, R9, and R10 are independently chosen from H, a C1-C10 alkyl, or —OR11, where R11 is a C1-C10 alkyl, and at least one of R3, R4, R5, R6, R7, R8, R9, and/or R10 are H;
x is 1 to 10;
y is 2 to 10;
and
Ar is an aromatic group;
wherein the second adhesion promoter is chosen from one or more compounds of the formula R47—SiR48r(OR49)3-r where R47 is a cyclic hydrido siloxane containing group of the formula:
R48 is independently selected from a C1-C10 hydrocarbon group;
each R49 is independently selected from a C1-C10 hydrocarbon;
r is 0, 1, or 2:
R51, R52, and R53 are independently chosen from H, a C1-C10 alkyl, or —OR54, where R54 is a C1-C10 alkyl, and at least one of R51, R52, and R53 are H;
and R50 is an organosilicon group having a side chain bonded to a silicon atom and represented by the following formula
Q1-C(O)—O-Q2
wherein Q1 represents a linear or branched alkylene group that forms a carbon chain having two or more carbon atoms between a silicon atom in R47 and an ester bond, and Q2 represents a linear or branched alkylene group that forms a carbon chain having three or more carbon atoms between an oxygen atom and a silicon atom in SiR48r(OR49)3-r;
and
wherein the first adhesion promoter and the second adhesion promoter are included in the curable silicone composition in different amounts by weight.

26 more elements