Sealant composition

Patent metadata

Field	Value
Publication number	US-12570883-B2
Application number	US-201917786425-A
Country	US
Kind code	B2
Filing date	Dec 17, 2019
Priority date	Dec 17, 2019
Publication date	Mar 10, 2026
Grant date	Mar 10, 2026

Abstract

Two-part condensation curable silyl-modified polymer (SMP) based sealant compositions, in particular two-part condensation curable SMP based translucent sealant compositions containing a catalyst comprising (i) a titanate and/or zirconate and (ii) a metal carboxylate salt.

First claim

What is claimed is:

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.

Assignees

• Dow Silicones Corp

Inventors

• Peng Jiang
• Guo Yi
• Liu Nanguo
• Shephard Nick
• Wu Ye

Classifications

• C08L83/04

  Polysiloxanes · CPC title

• B01J31/12

  containing organo-metallic compounds or metal hydrides · CPC title

• B01J21/066

  Zirconium or hafnium; Oxides or hydroxides thereof · CPC title

• B01J21/063

  Titanium; Oxides or hydroxides thereof · CPC title

• C09D171/02 Primary

  Polyalkylene oxides · CPC title