Granted Patent B2

US 12,497,539 · App. 17/631,014 · Granted Dec 16, 2025

Inventors: Rui Wang (Shanghai, CN); Shaohui Wang (Shanghai, CN); Yusheng Chen (Shanghai, CN)

Assignee: DOW SILICONES CORPORATION

C09D183/10C08K3/36C08K5/56C09D7/61C09D7/63D06M15/643

Abstract

Claims (40)

1 . A hydrosilylation curable textile coating composition, the composition comprising:

(a) a linear organopolysiloxane polymer having at least two alkenyl and/or alkynyl groups per molecule;

(b) a reinforcing filler comprising at least one of fumed silica, precipitated silica, or calcium carbonate;

(c) a linear trimethyl terminated polydimethyl methylhydrogen siloxane containing at least two, optionally at least three, silicon-bonded hydrogen groups per molecule;

(d) a hydrosilylation cure catalyst;

(e) an organosilicon resin containing M and Q units, wherein M units are R 2 3 SiO 1/2 and Q units are SiO 4/2 , each R 2 is the same or different monovalent hydrocarbon group, and at least one R 2 is a vinyl group; and

(f) an adhesion promoter comprising a mixture and/or reaction product of:

(i) one or more alkoxysilanes having an epoxy group in the molecule;

(ii) a linear organopolysiloxane oligomer containing at least one alkenyl group and at least one hydroxy or alkoxy group per molecule; and

(iii) an organometallic condensation reaction catalyst comprising organoaluminum or organozirconium compounds;

wherein component (e) contains an average of from 2 to 7.5 weight % vinyl groups;

wherein the molar ratio of M to Q units has a value of from 0.6:1 to 1.1:1;

wherein component (e) has a number-average molecular weight of from 3,000 to 30,000 g/mol;

wherein:

component (a) is present in an amount of from 50 to 75 wt. % of the composition;

component (b) is present in an amount of from 5 to 25 wt. % of the composition;

component (c) is present in an amount of from 1 to 30 wt. % of the composition;

component (d) is present in an amount of from 0.001 to 3 wt. % of the composition;

component (e) is present in an amount of from 1 to 40 wt. % of the composition; and

component (f) is present in an amount of from 0.3 to 6 wt. % of the composition;

provided the total wt. % is 100 wt. % of the composition; and

wherein the composition, upon cure on a fabric substrate, has a scrub resistance of greater than 600 strokes after heat aging at 105° C. and 95% relative humidity in accordance with EASC 99040180 A09.

2 . The composition in accordance with claim 1 , wherein

i) the molar ratio of silicon-bonded hydrogen groups to alkenyl groups and alkynyl groups in the composition is from 1:1 to 5:1 in accordance with ASTM E168, and/or

ii) component (c) is present in an amount of from 1 to 15% by weight of the composition.

3 . The composition in accordance with claim 1 , wherein the adhesion promoter (f) is present in the composition in a cumulative amount of components (f) (i), (ii) and (iii) of from about 0.3 to 4% by weight of the composition.

4 . The composition in accordance with claim 1 , wherein component (f) (i) is

i) selected from the group consisting of 3-glycidoxypropyl trimethoxysilane, 3-glycidoxypropyl triethoxysilane, 3-glycidoxypropyl methyldimethoxysilane, 4-glycidoxybutyl trimethoxysilane, 5,6-epoxyhexyl triethoxysilane, 2-(3,4-epoxycyclohexyl) ethyltrimethoxysilane, and 2-(3,4-epoxycyclohexyl) ethyltriethoxysilane, and/or

ii) is present in an amount of from 0.1 to 5% by weight of the composition.

5 . The composition in accordance with claim 1 , wherein component (f) (ii) is

i) a methylvinylpolysiloxane in which both molecular terminals are dimethylhydroxysiloxy units, or a copolymer of a methylvinyl siloxane and dimethylsiloxane units in which both molecular terminals are dimethylhydroxysiloxy units, in each case having a viscosity not exceeding 500 mPa·s at 25° C., and/or

ii) is present in an amount of from 0.1 to 5% by weight of the composition.

6 . The composition in accordance with claim 1 , wherein component (f) (iii) is a zirconate based catalyst selected from the group consisting of zirconium tetrapropylate, zirconium tetrabutyrate, tetra-isopropyl zirconate, zirconium (IV) tetraacetyl acetonate, zirconium (IV) hexafluoracetyl acetonate, zirconium (IV) trifluoroacetyl acetonate, tetrakis (ethyltrifluoroacetyl acetonate) zirconium, tetrakis (2,2,6,6-tetramethyl-heptanethionate) zirconium, zirconium (IV) dibutoxy bis(ethylacetonate), zirconium tributoxyacetylacetate, zirconium butoxyacetylacetonate bisethylacetoacetate, zirconium butoxyacetylacetonate bisethylacetoacetate, diisopropoxy bis(2,2,6,6-tetramethyl-heptanethionate) zirconium, and zirconium complexes having β-diketones.

7 . The composition in accordance with claim 1 , wherein the composition further comprises an inhibitor to inhibit cure of the composition.

8 . The composition in accordance with claim 1 , wherein the composition is stored in two parts, Part A and Part B, in which Part A comprises components (a), (b), (d), and (f) (iii) and optionally component (e), and Part B comprises components (a), (b), (c), (f)(i), and (f)(ii) and optionally component (e).

9 . The composition in accordance with claim 1 , which upon cure on a fabric substrate has a scrub resistance of 800 strokes or greater after heat aging at 105° C. and 95% relative humidity in accordance with EASC 99040180 A09.

10 . An airbag fabric coated with an elastomeric coating which is a cured product of the hydrosilylation curable textile coating composition in accordance with claim 1 .

11 . The airbag fabric in accordance with claim 10 , which has a scrub resistance of 800 strokes or greater after heat aging at 105° C. and 95% relative humidity in accordance with EASC 99040180 A09.

12 . A method of coating a textile with the hydrosilylation curable textile coating composition in accordance with claim 1 , comprising mixing the composition, coating a textile with the composition, and curing the composition on the textile.

13 . A method of coating a textile with the hydrosilylation curable textile coating composition in accordance with claim 1 , wherein the textile is coated with the composition by spraying, gravure coating, bar coating, coating by knife-over-roller, coating by knife-over-air, padding, dipping and screen-printing, and/or wherein the composition is applied at a coat-weight of from 10 g/m 2 to 150 g/m 2 .

Assignments (2)

Continuity (1)

References Cited (40)