Curable composition

Inactive Publication Date: 2009-07-16
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0027]The present invention provides a curable composition which comprises a reactive silyl group-containing organic polymer and in which an amidine

Problems solved by technology

In recent years, however, the toxicity of organotin type compounds have been pointed out and development of non-organotin catalysts has been looked for.
However, curable compositions using the non-organotin type silanol condensation catalysts described in the above-cited patent documents are sometimes insufficient in surface curability and, further, tend to decrease in adhesiveness with the increasing addition level of carboxylic acid.
As the description in the example section in Patent Document 6 discloses that cure was effected over such a long period as one we

Method used

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  • Curable composition

Examples

Experimental program
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Effect test

Example

Synthesis Example 1

[0285]Propylene oxide was polymerized using polyoxypropylene diol with a molecular weight of about 2,000 as an initiator and a zinc hexacyanocobaltate glyme complex catalyst to give polypropylene oxide having a number average molecular weight of about 25,500 (polystyrene-equivalent molecular weight measured by using a TOSOH model HLC-8120 GPC solvent delivery system, a TOSOH model TSK-GEL H type column, with THF as a solvent). Thereto was then added a methanol solution of NaOMe in an amount of 1.2 equivalents relative to the hydroxyl groups of that hydroxyl-terminated polypropylene oxide, the methanol was distilled off and, further, allyl chloride was added to the residue for conversion of each terminal hydroxyl group to an allyl group. The unreacted allyl chloride was removed by volatilization under reduced pressure. To 100 parts by weight of the crude allyl-terminated polypropylene oxide obtained were added 300 parts by weight of n-hexane and 300 parts by weight...

Example

Synthesis Example 2

[0288]The polymer (P) (100 parts by weight) obtained in Synthesis Example 1 was reacted with 0.95 part by weight of trimethoxysilane at 90° C. for 5 hours in the presence of 150 ppm of an isopropanol solution of a platinum-vinylsiloxane complex (platinum content: 3% by weight) as a catalyst to give a trimethoxysilyl group-terminated polyoxypropylene type polymer (T). As a result of 1H-NMR measurement, the number of terminal trimethoxysilyl groups was found to be about 1.3 per molecule on an average.

Example 1

[0289]Surface-treated colloidal calcium carbonate (120 parts by weight; product of Shiraishi Kogyo Kaisha Ltd., trade name: Hakuenka CCR), 20 parts by weight of titanium oxide (product of Ishihara Sangyo Kaisha Ltd., trade name: Tipaque R-820), 55 parts by weight of a plasticizer (product of Kyowa Hakko Kogyo Co., Ltd., trade name: DIDP), 2 parts by weight of a thixotropic agent (product of Kusumoto Chemicals Ltd., trade name: Disparlon #6500), 1 part by weight...

Example

Example 3

[0293]A curable composition was obtained in the same manner as in Example 1 except that Versatic 10 was used in an amount of 2.3 parts by weight. The ratio between the number of moles (b) of all nitrogen atoms in the (B-1) component and the number of moles (c) of all carboxyl groups in the (C) component, namely the ratio (b) / (c), was 20.

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Abstract

The present invention has its object to provide a curable composition which comprises an amidine compound as a non-organotin catalyst and shows good elongation, flexibility, surface curability, depth curability and adhesiveness; the above object can be achieved by a non-organotin curable composition which comprises: (A) an organic polymer containing a silyl group capable of crosslinking under siloxane bond formation, the silyl group being a group represented by the general formula (1): —SiR1X2; (B) an amidine compound (B-1) as a silanol condensation catalyst; and (C) a carboxylic acid, wherein the ratio between the number of moles (b) of all nitrogen atoms in the (B-1) component of the composition and the number of moles (c) of all carboxyl groups in the (C) component of the composition, namely the ratio (b)/(c), is higher than 2.

Description

TECHNICAL FIELD[0001]The present invention relates to a curable composition which comprises an organic polymer containing a silicon atom-bound hydroxyl or hydrolyzable group and containing a silyl group capable of crosslinking under siloxane bond formation (hereinafter referred to as a “reactive silyl group”).BACKGROUND ART[0002]It is known that organic polymers containing at least one reactive silyl group in the molecule have properties such that they are crosslinked under siloxane bond formation resulting from hydrolysis and other reactions of the reactive silyl group due to moisture and the like, even at room temperature to give rubber-like cured products.[0003]Among these reactive silyl group-containing polymers, those polymers which have a polyoxyalkylene type or polyisobutylene type main chain skeleton are disclosed in Patent Document 1, Patent Document 2 and the like and have already been produced industrially and are in wide use in such fields as sealants, adhesives and coat...

Claims

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Application Information

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IPC IPC(8): C08L83/00
CPCC08G65/336C08K5/0016C08K5/31C08L71/02C08L101/10C09K3/1018C09D201/10C09J133/14C08L2666/22
Inventor NORO, NORIKOWAKABAYASHI, KATSUYUOKAMOTO, TOSHIHIKO
Owner KANEKA CORP
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