Curable composition

Patent metadata

Field	Value
Publication number	US-10077375-B2
Application number	US-201414894977-A
Country	US
Kind code	B2
Filing date	May 29, 2014
Priority date	May 30, 2013
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

A curable composition includes organic polymer (A) having more than one reactive silicon group on average per molecule, represented by formula (1): —SiR 1 a X 3-a (1), wherein R 1 is a substituted or unsubstituted hydrocarbon group having 1-20 carbon atoms, each X is independently a hydroxy group or a hydrolyzable group, and a is 0 or 1, and (meth)acrylate-based polymer (B) having a reactive silicon group represented by formula (2): —SiX 3 (2), wherein each X is as defined for the formula (1), polymer (B) has a reactive silicon group equivalent of not less than 0.30 mmol/g, and wherein a monomer (b1) is free of a reactive silicon group, a glass transition temperature of its homopolymer is not more than 80° C., and is contained as monomer(s) constituting polymer (B) in a proportion of not less than 40 wt % per 100 wt % of total monomer.

First claim

The invention claimed is:

1. A curable composition comprising:
organic polymer (A) having more than one reactive silicon group on average per molecule, which is represented by formula (1):
—SiR 1 a X 3-a   (1)

 wherein R 1 is a substituted or unsubstituted hydrocarbon group having 1-20 carbon atoms, each X is independently a hydroxy group or a hydrolyzable group, and a is 0 or 1, and
(meth)acrylate-based polymer (B) having a reactive silicon group represented by formula (2):
—SiX 3   (2)

 wherein each X is as defined for the formula (1),
wherein the polymer (B) has a reactive silicon group equivalent of not less than 0.30 mmol/g, and comprises a monomer (b1) in a proportion of not less than 40 wt % per 100 wt % of total monomers constituting the polymer (B),
wherein the monomer (b1) is free of a reactive silicon group, and a glass transition temperature of a homopolymer of the monomer (b1) is not more than 80° C.,
wherein the monomer (b1) comprises a (meth)acrylate monomer (b1-a) having an alkyl group having 3-6 carbon atoms and a (meth)acrylate monomer (b1-b) having an alkyl group having 7-30 carbon atoms, and a mixing ratio of the monomer (b1-a) and the monomer (b1-b) is (b1-a):(b1-b)=80:20-50:50 (parts by weight),
wherein the polymer (A) has more than one reactive silicon group on average per terminal portion,
wherein a mixing ratio of the polymer (A) and the polymer (B) is (A):(B)=80:20-50:50 (parts by weight), and
wherein a tensile strength at break measured by a tensile test according to JIS K 6251 of a cured product obtained from the curable composition is not less than 3.2 MPa.

2. The curable composition according to claim 1 , wherein the reactive silicon group of the polymer (B) is a trimethoxysilyl group.

3. The curable composition according to claim 1 , wherein the polymer (B) has not less than 1.5 reactive silicon groups on average per molecule.

4. The curable composition according to claim 1 , wherein a total amount of the monomer (b1-a) and the monomer (b1-b) is not less than 60 wt % per 100 wt % of the total monomers.

5. The curable composition according to claim 1 , wherein organic polymer (A) comprises a polyoxyalkylene-based polymer as a main chain skeleton.

6. The curable composition according to claim 1 , wherein the polymer (A) has a number average molecular weight of not less than 20,000.

7. The curable composition according to claim 1 , wherein the polymer (B) has a number average molecular weight of not less than 4,000.

8. The curable composition according to claim 1 , wherein the polymer (B) has a number average molecular weight of not less than 10,000.

9. The curable composition according to claim 1 , wherein the polymer (B) has a number average molecular weight of 500 to less than 4,000.

10. The curable composition according to claim 1 , wherein the polymer (B) further comprises methyl methacrylate as monomer (b2), where not more than 30 wt % of total monomers constituting polymer (B) are monomer (b2).

11. The curable composition according to any claim 1 , wherein a mercapto compound is not used during polymerization of the polymer (B).

12. The curable composition according to claim 1 , further comprising a high molecular weight plasticizer as plasticizer (C).

13. The curable composition according to claim 12 , comprising polyoxyalkylene-based polymer as plasticizer (C).

14. The curable composition according to claim 12 , comprising a (meth)acrylate-based polymer as plasticizer (C).

15. The curable composition according to claim 12 , wherein the high molecular weight plasticizer has not more than one reactive silicon group on average per molecule.

16. The curable composition according to claim 1 , further comprising, as a filler, heavy calcium carbonate having an average primary particle size of less than 1 μm.

17. The curable composition according to claim 1 , further comprising titanium oxide as a filler.

18. The curable composition according to claim 1 , further comprising aluminum hydroxide as a filler.

19. A coating film waterproofing agent comprising the curable composition according to claim 1 .

20. A cured product obtained from the curable composition according to claim 1 .

Assignees

• Kaneka Corp

Inventors

• Miyafuji Kiyoshi
• Itano Yu
• Wakabayashi Katsuyu

Classifications

• C08L71/02

  Polyalkylene oxides · CPC title

• C09D133/06

  of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical · CPC title

• C09D143/04

  Homopolymers or copolymers of monomers containing silicon · CPC title

• C08L33/06

  of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical · CPC title

• C08G65/336

  containing silicon · CPC title