# US 2022/0033698 A1 · Adhesive

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- Number: US 2022/0033698 A1
- Document ID: US20220033698A1
- Status: Published application
- Kind: A1
- Application number: 17/288,513
- Filed: 2018-10-31
- Published: 2022-02-03
- Earliest claimed: 2018-10-31
- Assignees: Dow Silicones Corporation
- Applicants: Dow Silicones Corporation
- Inventors: Yi GUO; Jiang PENG; Qiang SONG; Ye WU
- Web page: https://patentgrep.com/patent/US20220033698A1

## CPC

- C09J 175/08: from polyethers
- C09J 183/06: containing silicon bound to oxygen-containing groups (C09J183/12 takes precedence)
- C08G 65/336: containing silicon
- C09J 11/04: inorganic
- C09J 133/08: Homopolymers or copolymers of acrylic acid esters
- C09J 143/04: Homopolymers or copolymers of monomers containing silicon
- C09J 171/00: Adhesives based on polyethers obtained by reactions forming an ether link in the main chain (based on polyacetals C09J159/00; based on epoxy resins C09J163/00; based on polythioether-ethers C09J181/02; based on polyethersulfones C09J181/06); Adhesives based on derivatives of such polymers
- C09J 171/02: Polyalkylene oxides
- C09J 175/04: Polyurethanes
- C08K 2003/265: {Calcium, strontium or barium carbonate}
- C09J 2433/00: Presence of (meth)acrylic polymer
- C09J 2471/00: Presence of polyether
- C09J 2475/00: Presence of polyurethane
- C09J 2483/00: Presence of polysiloxane
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The two-part condensation curable silyl-modified polymer based adhesive composition in accordance with claim 1, wherein the reinforcing filler (b) in Part A is a precipitated calcium carbonate and the optional filler (iv) in Part B is ground calcium carbonate, precipitated calcium carbonate, precipitated silica, and/or fumed silica.

### Claim 3 (depends on 1)

The two-part condensation curable silyl-modified polymer based adhesive composition in accordance with claim 1, wherein the tin based catalyst (i) in Part B is a tin catalyst selected from the group consisting of a tin triflate, triethyltin tartrate, tin octoate, tin oleate, tin naphthate, butyltintri-2-ethylhexoate, tin butyrate, carbomethoxyphenyl tin trisuberate, isobutyltintriceroate, dibutyltin dilaurate, dimethyltin dibutyrate, dibutyltin dimethoxide, dibutyltin diacetate, dimethyltin bisneodecanoate, dibutyltin dibenzoate, stannous octoate, dibutyltin bis 2,4-pentanedionate, dimethyltin dineodecanoate, and dibutyltin dioctoate.

### Claim 4 (depends on 1)

The two-part condensation curable silyl-modified polymer based adhesive composition in accordance with claim 1, wherein the polymer (a) in Part A is a polyether terminated with
(R)m(Y1)3-m—Si-D-[NH—C(═O)]k—
where each R is a hydroxyl or a hydrolysable group, each Y1 is an alkyl group containing from 1 to 8 carbons, m is 1, 2, or 3, D is a divalent C2-6 alkylene group, and k is 1 or 0.

### Claim 5 (depends on 1)

The two-part condensation curable silyl-modified polymer based adhesive composition in accordance with claim 1, wherein the cross-linker (ii) in Part B is either cross-linker (iic) or a mixture of cross-linkers (iic) and (iid).

### Claim 6 (depends on 1)

The two-part condensation curable silyl-modified polymer based adhesive composition in accordance with claim 1, wherein a pigment/non-reinforcing filler is present in Part B in an amount of from 1 to 30% by weight of Part B.

### Claim 7 (depends on 1)

The two-part condensation curable silyl-modified polymer based adhesive composition in accordance with claim 1, wherein Part B comprises:
the tin based catalyst (i) in an amount of from 0.5 to 40 weight %;
the cross-linker (ii) in an amount of from 1 to 80 weight %;
the silyl modified organic polymer (iii) in an amount of from 0 to 98.5 weight %; and
the filler (iv) in an amount of from 0 to 40% by weight; with the total weight of Part B being 100% by weight.

### Claim 8 (depends on 1)

The two-part condensation curable silyl-modified polymer based adhesive composition in accordance with claim 1, wherein Part A and Part B are inter-mixed in a weight ratio of from 15:1 to 1:1.

### Claim 9 (depends on 1)

A lamp having a lamp body defining a lamp chamber containing a light source and having a front opening, and a front lens to engage into the front opening, the front lens having an inner surface and an outer surface, with the inner surface further defining the lamp chamber, the inner surface being coated with an anti-haze coating, wherein the front lens is adhered to the lamp chamber by a cured adhesive formed from the two-part condensation curable silyl-modified polymer based adhesive composition in accordance with claim 1.

### Claim 10 (depends on 9)

The lamp in accordance with claim 9, wherein the lamp body is made from polybutylene terephthalate, cast aluminum, acrylonitrile butadiene styrene, polypropylene, ethylene propylene diene monomer rubber, polyphenylene sulfide, polyether ether ketone or a composite thereof, low density polyethylene, high density polyethylene, polyamide, acrylic-styrene-acrylonitrile, or polybutylene terephthalate or a composite thereof.

### Claim 11 (depends on 9)

The lamp in accordance with claim 9, wherein the front lens is made from polycarbonate or poly(methyl methacrylate).

### Claim 12 (depends on 9)

The lamp in accordance with claim 9, wherein the outer surface of the front lens is treated with a scratch resistant coating.

### Claim 13 (depends on 9)

A method for making the lamp in accordance with claim 9, the method including the steps of: providing the lamp body and the front lens; engaging the front lens into the front opening of the lamp body to form a joint; and sealing the joint between the front lens and the lamp body with the adhesive composition by mixing Part A and Part B together to form a mixture, applying the mixture onto the joint between the front lens and the lamp body, and causing or allowing the adhesive composition to cure.

### Claim 14 (depends on 9)

The lamp in accordance with claim 9, further defined as at least one of an outdoor light, a decorative light, or a vehicle lamp.

### Claim 15 (depends on 14)

The lamp in accordance with claim 14, further defined as a vehicle lamp selected from the group consisting of headlamps, brake lamps, running lamps, turn signal lamps, fog lamps, back-up lamps, and parking lamps.

### Claim 16 (depends on 1)

An adhesive comprising the reaction product of the two-part condensation curable silyl-modified polymer based adhesive composition in accordance with claim 1.