US 2022/0033698 A1Published application

Adhesive

AssigneeDow Silicones Corporation

InventorsYi GUO, Jiang PENG, Qiang SONG, Ye WU

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Abstract

Described herein is a two-part condensation curable silyl-modified polymer based adhesive composition suitable for the adhesion of a front lens having an anti-haze coating onto a lamp body for lighting applications. Also described herein are lamps comprising a lamp body and a front lens utilizing the adhesive composition to adhere the front lens to the lamp body while generally preserving the integrity of the anti-haze coating.

Claims16

Dependent claims

A two-part condensation curable silyl-modified polymer based adhesive composition comprising a base part, Part A, and a catalyst package, Part B, wherein part A comprises:

(a) a silyl modified organic polymer having at least two (R)m(Y1)3-m—Si groups per molecule
where each R is a hydroxyl or a hydrolysable group, each Y1 is an alkyl group containing from 1 to 8 carbons, and m is 1, 2, or 3, and where the organic polymer is selected from the group consisting of polyethers, hydrocarbon polymers, acrylate polymers, polyesters, polyurethanes and polyureas;
and
(b) a reinforcing filler;
and
wherein Part B comprises:
(i) a tin based catalyst;
and
(ii) a cross-linker selected from the group consisting of:—
(iia) a silane of the structure
R6jSi(OR5)4-j
where each R5 is an independently selected alkyl group containing at least 2 carbon atoms;
j is 1 or 0;
and R6 is a silicon-bonded organic group selected from a substituted or unsubstituted straight or branched monovalent hydrocarbon group having at least 2 carbons, a cycloalkyl group, an aryl group, an aralkyl group or any one of the foregoing wherein at least one hydrogen atom bonded to carbon is substituted by a halogen atom, or an organic group having an epoxy group, a glycidyl group, an acyl group, a carboxyl group, an ester group, an amino group, an amide group, a (meth)acryl group, a mercapto group or an isocyanate group;
(iib) a silane of the structure
R7Si(OMe)3
wherein Me is CH3 and R7 is R6 providing the molecular weight of the silane (iib) is ≥190;
(iic) a silane of the structure
(R′O)3Si(CH2)nN(H)—(CH2)zNH2
where each R′ is an independently selected alkyl group containing from 1 to 10 carbon atoms, n is from 2 to 10, and z is from 2 to 10;
(iid) a dipodal silane of the structure
(R4O)r(Y2)3-r—Si(CH2)x—((NHCH2CH2)t-Q(CH2)x)w—Si(OR4)r(Y2)3-r
where each R4 is a C1 to C10 alkyl group, each Y2 is an alkyl group containing from 1 to 8 carbon atoms, Q is a chemical group containing a heteroatom with a lone pair of electrons;
each x is an integer of from 1 to 6, and t is 0 or 1;
each r is independently 1, 2 or 3, and w is 0 or 1, or
(iie) a mixture of two or more of (iia), (iib), (iic) and (iid);
and optionally
(iii) a silyl modified organic polymer having at least two (R)m(Y1)3-m—Si groups per molecule, and/or
(iv) a filler.

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Dependencies are inferred from the claim text.

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Abstract

A two-part condensation curable silyl-modified polymer based adhesive composition comprising a base part, Part A, and a catalyst package, Part B, wherein part A comprises:

(a) a silyl modified organic polymer having at least two (R)m(Y1)3-m—Si groups per molecule
where each R is a hydroxyl or a hydrolysable group, each Y1 is an alkyl group containing from 1 to 8 carbons, and m is 1, 2, or 3, and where the organic polymer is selected from the group consisting of polyethers, hydrocarbon polymers, acrylate polymers, polyesters, polyurethanes and polyureas;
and
(b) a reinforcing filler;
and
wherein Part B comprises:
(i) a tin based catalyst;
and
(ii) a cross-linker selected from the group consisting of:—
(iia) a silane of the structure
R6jSi(OR5)4-j
where each R5 is an independently selected alkyl group containing at least 2 carbon atoms;
j is 1 or 0;
and R6 is a silicon-bonded organic group selected from a substituted or unsubstituted straight or branched monovalent hydrocarbon group having at least 2 carbons, a cycloalkyl group, an aryl group, an aralkyl group or any one of the foregoing wherein at least one hydrogen atom bonded to carbon is substituted by a halogen atom, or an organic group having an epoxy group, a glycidyl group, an acyl group, a carboxyl group, an ester group, an amino group, an amide group, a (meth)acryl group, a mercapto group or an isocyanate group;
(iib) a silane of the structure
R7Si(OMe)3
wherein Me is CH3 and R7 is R6 providing the molecular weight of the silane (iib) is ≥190;
(iic) a silane of the structure
(R′O)3Si(CH2)nN(H)—(CH2)zNH2
where each R′ is an independently selected alkyl group containing from 1 to 10 carbon atoms, n is from 2 to 10, and z is from 2 to 10;
(iid) a dipodal silane of the structure
(R4O)r(Y2)3-r—Si(CH2)x—((NHCH2CH2)t-Q(CH2)x)w—Si(OR4)r(Y2)3-r
where each R4 is a C1 to C10 alkyl group, each Y2 is an alkyl group containing from 1 to 8 carbon atoms, Q is a chemical group containing a heteroatom with a lone pair of electrons;
each x is an integer of from 1 to 6, and t is 0 or 1;
each r is independently 1, 2 or 3, and w is 0 or 1, or
(iie) a mixture of two or more of (iia), (iib), (iic) and (iid);
and optionally
(iii) a silyl modified organic polymer having at least two (R)m(Y1)3-m—Si groups per molecule, and/or
(iv) a filler.

26 more elements