Curable composition

Patent metadata

Field	Value
Publication number	US-9534158-B2
Application number	US-201214002573-A
Country	US
Kind code	B2
Filing date	Feb 22, 2012
Priority date	Mar 2, 2011
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

The present invention provides a curable composition useful as a contact adhesive which has a high rate of initial tack development, high tack strength, and long retention time of the developed tack. The curable composition includes an organic polymer (Q) containing a reactive silyl group, and a linear organic polymer (P) having a number average molecular weight larger than that of the polymer (Q) and having a reactive silyl group containing three hydrolyzable groups at only one terminal. The organic polymer (P) and the organic polymer (Q) are mixed at a mixing ratio (P):(Q), in terms of parts by weight, of 60:40 to 5:95.

First claim

The invention claimed is:

1. A curable composition, comprising
a linear organic polymer (P) having 0.5 to less than 1.0 reactive silyl groups on average per molecule represented by the following formula (1), and
an organic polymer (Q) containing a reactive silyl group represented by the following formula (2),
the organic polymer (P) and the organic polymer (Q) being mixed at a mixing ratio (P):(Q), in terms of parts by weight, of 60:40 to 5:95,
the organic polymer (P) having a number average molecular weight larger than that of the organic polymer (Q),
the formula (1) being:
—V—SiX 3   (1)

wherein V represents a C1 to C8 divalent hydrocarbon group, Xs each represent a hydroxyl or hydrolyzable group, and when there are a plurality of Xs, Xs may be the same as or different from one another,
the formula (2) being:
—V—SiR 1 d X 3-d   (2)

wherein R 1 represents a C1 to C20 hydrocarbon group, a C6 to C20 aryl group, a C7 to C20 aralkyl group, or a triorganosiloxy group represented by R 0 3 SiO— where the three R 0 s each represent a C1 to C20 hydrocarbon group and may be the same as or different from one another; V represents a C1 to C8 divalent hydrocarbon group; X represents a hydroxyl or hydrolyzable group; d represents 1 or 2; when there are a plurality of R 1 s, R 1 s may be the same as or different from one another; and when there are a plurality of Xs, Xs may be the same as or different from one another.

2. The curable composition according to claim 1 ,
wherein a backbone structure of the organic polymer (P) is a polyoxypropylene polymer.

3. The curable composition according to claim 1 ,
wherein a backbone structure of the organic polymer (Q) is a polyoxypropylene polymer.

4. The curable composition according to claim 1 ,
wherein the organic polymer (P) has a number average molecular weight of 10000 or more.

5. The curable composition according to claim 1 ,
wherein the organic polymer (Q) has a number average molecular weight of 20000 or less.

6. The curable composition according to claim 1 ,
wherein the organic polymer (Q) has 1.4 or more reactive silyl groups per molecule on average.

7. The curable composition according to claim 1 , further comprising a (meth)acrylic acid alkyl ester (co)polymer (R).

8. The curable composition according to claim 1 , comprising an amine compound as a curing catalyst (H).

9. The curable composition according to claim 1 , comprising a tin compound as a curing catalyst (H) in an amount of 2 parts by weight or less for each 100 parts by weight in total of the polymers (P) and (Q).

10. The curable composition according to claim 9 ,
wherein the tin curing catalyst (H) is at least one of dibutyltin dilaurate and dioctyltin dilaurate.

11. The curable composition according to claim 1 , comprising at least one of silica and calcium carbonate as a filler (F).

12. The curable composition according to claim 2 ,
wherein the organic polymer (P) having a polyoxypropylene polymer backbone structure is formed from a polyoxypropylene polymer polymerized using an initiator that has one hydroxyl group per molecule.

13. A contact adhesive, comprising the curable composition according to claim 1 as a component.

14. The curable composition according to claim 1 , wherein the reactive silyl group represented by the formula (2) is —CH 2 CH 2 CH 2 —Si(CH 3 ) (OCH 3 ) 2 .

15. The curable composition according to claim 1 , wherein the organic polymer (P) has a number average molecular weight of 22,000 or more.

Assignees

• Fujimoto Toyohisa
• Okamoto Toshihiko
• Kaneka Corp

Inventors

• Fujimoto Toyohisa
• Okamoto Toshihiko

Classifications

• C08L101/10

  containing hydrolysable silane groups · CPC title

• C09J171/02 Primary

  Polyalkylene oxides · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08G65/336

  containing silicon · CPC title

• C08G65/2663

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