Curable composition and cured product thereof

Patent metadata

Field	Value
Publication number	US-9593271-B2
Application number	US-201214345751-A
Country	US
Kind code	B2
Filing date	Sep 20, 2012
Priority date	Sep 22, 2011
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

The present invention provides a sealant composition that includes a reactive silyl group-containing organic polymer, and gives a cured product having a low modulus and not having wrinkles or cracks on the surface even though the sealant includes as a curing catalyst a tetravalent tin compound, which is presumed to reduce recovery. The sealant composition is a one-component curable sealant composition including: a linear organic polymer (A) having a number average molecular weight of 11,000 to 30,000, and having an ethanol-elimination reactive silyl group at a molecular terminal; a tetravalent tin compound (B); and a plasticizer (C).

First claim

The invention claimed is:

1. A one-component curable sealant composition, comprising:
100 parts by weight of a linear organic polymer (A) having a number average molecular weight calculated from the amount of hydroxy groups of 11,000 to 30,000, and having a triethoxysilyl group at a molecular terminal;
0.5 to 10 parts by weight of a tetravalent tin compound (B);
70 to 200 parts by weight of a plasticizer (C); and
a silane coupling agent
comprising a mixture of triethoxyvinylsilane and trimethoxyaminosilane.

2. The one-component curable sealant composition according to claim 1 , wherein the tetravalent tin compound (B) is at least one of a dibutyltin compound and a dioctyltin compound.

3. The one-component curable sealant composition according to claim 1 , wherein the component (A) comprises at least one of a polyoxyalkylene polymer and a polyacrylate polymer as its backbone.

4. The one-component curable sealant composition according to claim 1 , wherein the component (A) has a number average molecular weight calculated from the amount of hydroxy groups of 13,000 to 25,000.

5. The one-component curable sealant composition according to claim 1 , wherein the organic polymer (A) is derived from a polyoxyalkylene polymer formed by ring-opening addition polymerization of an alkylene oxide in the presence of a double metal cyanide complex catalyst.

6. The one-component curable sealant composition according to claim 1 , wherein the organic polymer (A) is a polyoxypropylene polymer.

7. The one-component curable sealant composition according to claim 1 , wherein the organic polymer (A) has 1.0 to 2.0 ethanol-elimination reactive silyl groups per molecule on average.

8. The one-component curable sealant composition according to claim 1 , which gives a cured product having a modulus at 100% elongation, measured by a method defined in ISO 8339, of 0.4 MPa or lower.

9. A one-component curable sealant for buildings, comprising the curable sealant composition according to claim 1 .

10. A one-component curable sealant for working joints, comprising the curable sealant composition according to claim 1 .

11. A one-component curable sealant for curtain walls, comprising the curable sealant composition according to claim 1 .

12. A one-component curable sealant for balcony window frames, comprising the curable sealant composition according to claim 1 .

13. A one-component curable sealant for stone materials, comprising the curable sealant composition according to claim 1 .

14. A one-component curable sealant for bridges, comprising
the curable sealant composition according claim 1 .

15. A cured product of the one-component curable sealant composition according to claim 1 .

16. The one-component curable sealant composition according to claim 1 , wherein the number of the triethoxysilyl groups in the organic polymer (A) per molecule of the polymer on average is 1.2 to 1.6.

17. The one-component curable sealant composition according to claim 1 , which comprises 70 to 150 parts by weight of the plasticizer (C) for 100 parts by weight of the organic polymer (A).

Assignees

• Kaneka Corp

Inventors

• Yano Ayako
• Fukunaga Atsushi
• Kawakami Atsushi
• Ogawa Akira

Classifications

• C08K5/0016

  Plasticisers · CPC title

• C08G65/336

  containing silicon · CPC title

• C08G65/2663

  Metal cyanide catalysts, i.e. DMC's · CPC title

• C09K3/1006 Primary

  characterised by the chemical nature of one of its constituents · CPC title

• C09K3/10

  {Materials in mouldable or extrudable form} for sealing or packing joints or covers (filling pastes C09D5/34) · CPC title