Granted Patent B2

US 12,570,883 · App. 17/786,425 · Granted Mar 10, 2026

Inventors: Jiang Peng (Shanghai, CN); Yi Guo (Shanghai, CN); Nanguo Liu (Midland, MI); Nick Shephard (Auburn, MI); Ye Wu (Shanghai, CN)

Assignee: DOW SILICONES CORPORATION

C09K3/1018B01J21/063B01J21/066B01J31/12C08L83/04

Abstract

Claims (55)

1 . A two-part condensation curable silyl modified polymer-based sealant composition comprising a base part, Part A, and a catalyst package, Part B,

wherein the base part comprises:

(a) a silyl modified organic polymer having at least two (R) m (Y 1 ) 3-m —Si— groups per molecule where each R is hydroxyl or a hydrolysable group, each Y 1 is an alkyl group containing from 1 to 8 carbons and m is 1, 2 or 3, which organic polymer is selected from polyethers, hydrocarbon polymers, acrylate polymers, polyesters, polyurethanes, and polyureas; and

(b) a reinforcing filler; and

optionally, further comprising:

(c) one or more plasticisers; and/or

(d) one or more stabilizers; and

wherein the catalyst package comprises:

(ai) a silyl modified organic polymer having at least two (R) m (Y 1 ) 3-m —Si— groups per molecule where each R is hydroxyl or a hydrolysable group, each Y 1 is an alkyl group containing from 1 to 8 carbons and m is 1, 2 or 3, which organic polymer is selected from polyethers, hydrocarbon polymers, acrylate polymers, polyesters, polyurethanes, and polyureas;

(e) a catalyst comprising (i) a titanate and (ii) a zinc carboxylate salt comprising:

zinc, and

a carboxylate group conforming to the formula R 15 COO − , where R 15 is an alkyl group; and

(f) an adhesion promoter; and

optionally, further comprising:

(g) a cross-linker; and/or

(h) a hydroxy scavenging agent selected from a disilazane or polysilazane; and

wherein the titanate (i) and the zinc carboxylate salt (ii) of catalyst (e) is provided in a molar ratio of 4:1 to 2:1.

2 . The two-part condensation curable silyl modified polymer-based sealant composition in accordance with claim 1 , wherein the zinc carboxylate salt (ii) is selected from the group consisting of zinc (II) carboxylates, zinc (II) alkylcarboxylates, and combinations thereof.

3 . The two-part condensation curable silyl modified polymer-based sealant composition in accordance with claim 1 , wherein the zinc carboxylate salt (ii) is selected from the group consisting of zinc ethylhexanoate, zinc stearate, zinc undecylenate, and zinc neodecanoate.

4 . The two-part condensation curable silyl modified polymer-based sealant composition in accordance with claim 1 , wherein silyl modified organic polymer (a) and/or silyl modified organic polymer (ai) is a polyether terminated with

(R) m (Y 1 ) 3-m —Si-D-[NH—C(═O)] k —

where each R is hydroxyl or a hydrolysable group, each Y 1 is an alkyl group containing from 1 to 8 carbons, m is 1, 2 or 3, D is a divalent C 2-6 alkylene group, and k is 1 or 0.

5 . The two-part condensation curable silyl modified polymer-based sealant composition in accordance claim 4 , wherein k is 0.

6 . The two-part condensation curable silyl modified polymer-based sealant composition in accordance with claim 1 , wherein Part A comprises:

silyl modified organic polymer (a) in an amount of from 50 to 96% by weight of Part A;

reinforcing filler (b) in an amount of from 4 to 40% by weight of Part A;

one or more plasticisers (c) in an amount of from 0 to 40% by weight of Part A; and

one or more stabilizers (d) in an amount of from 0 to 5% by weight of Part A;

wherein the total weight % of any Part A of the composition is 100%.

7 . The two-part condensation curable silyl modified polymer-based sealant composition in accordance with claim 1 , wherein Part B comprises:

silyl modified organic polymer (ai) in an amount of from 50 to 97.9% by weight of Part B;

catalyst (e) in an amount of from 2 to 10% by weight of Part B;

adhesion promoter (f) in an amount of from 0.1 to 25% by weight of Part B;

cross-linker (g) in an amount of from 0 to 25% by weight of Part B; and

moisture scavenger (h) in an amount of from 0 to 10% by weight of Part B;

wherein the total weight % of any Part B of the composition is 100%.

8 . The two-part condensation curable silyl modified polymer-based sealant 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.

9 . A method of making the two-part condensation curable silyl modified polymer-based sealant composition in accordance with claim 1 , the method comprising mixing all of Part A and Part B together in a pre-defined weight ratio of from 15:1 to 1:1.

10 . An elastomeric sealant material which is the cured product of the two-part condensation curable silyl modified polymer-based sealant composition in accordance with claim 1 .

11 . The elastomeric sealant material in accordance with claim 10 , which is translucent.

12 . A sealant suitable for use in the facade, insulated glass, window construction, automotive, solar and construction fields, wherein the sealant comprises or is formed from the two-part condensation curable silyl modified polymer-based sealant composition in accordance with claim 1 .

13 . A method for filling a space between two substrates so as to create a seal therebetween, the method comprising:

a) providing the two-part condensation curable silyl modified polymer-based sealant composition in accordance with claim 1 , and either b) or c);

b) applying the silicone composition to a first substrate, and bringing a second substrate in contact with the sealant composition that has been applied to the first substrate, or

c) filling a space formed by the arrangement of a first substrate and a second substrate with the sealant composition and curing the sealant composition.

14 . The two-part condensation curable silyl modified polymer-based sealant composition in accordance with claim 6 , wherein Part B comprises:

silyl modified organic polymer (ai) in an amount of from 50 to 97.9% by weight of Part B;

catalyst (e) in an amount of from 2 to 10% by weight of Part B;

adhesion promoter (f) in an amount of from 0.1 to 25% by weight of Part B;

cross-linker (g) in an amount of from 0 to 25% by weight of Part B; and

moisture scavenger (h) in an amount of from 0 to 10% by weight of Part B;

wherein the total weight % of any Part B of the composition is 100%.

15 . The two-part condensation curable silyl modified polymer-based sealant composition in accordance with claim 14 , wherein Part A and Part B are inter-mixed in a weight ratio of from 15:1 to 1:1.

16 . The two-part condensation curable silyl modified polymer-based sealant composition in accordance with claim 3 , wherein the zinc carboxylate salt (ii) is zinc ethylhexanoate.

17 . The two-part condensation curable silyl modified polymer-based sealant composition in accordance with claim 1 , wherein the titanate (i) is tetra t-butyl titanate.

Assignments (5)

Continuity (1)

References Cited (73)