Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1998-10-27
2000-02-29
Acquah, Samuel A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
528 12, 528 14, 528 29, 528 32, 528 92, 528 93, 528 95, 528 97, 528 98, 528101, 521 82, 521 86, 521 88, 521 89, 521 90, 521 92, 521 97, 521 99, 521110, 521113, 521134, 521136, 521139, 521154, 521180, C08J 900, C08G 5900
Patent
active
06031012&
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a novel curable composition which foams and cures at room temperature or under heat at relatively low temperatures to give foams which are poorly corrodable and poorly toxic, to the foams made from the composition, and to a method for producing the foams.
2. Background Art
As having good mechanical characteristics and flame retardancy, phenolic foams are widely used for soundproofing, heat insulation, water sealing, vapor sealing, damping, protection, cushioning, decoration, etc.
Phenolic foams include novolak foams to be produced by the use of acid catalysts and resolic foams to be produced by the use of alkali catalysts. To cure novolak foams, they must be heated, and their use is limited. Resolic foams can be cured at room temperature in the presence of acid catalysts, which, however, corrode metals. To solve this problem, neutralizing agents may be added to the curing system, but could not produce good results. Accordingly, desired are foams which can be produced and cured under heat at relatively low temperatures and which are poorly corrodable.
The present invention has been made in consideration of the current situation noted above, and its object is to provide a curable composition which is poorly corrodable and poorly toxic and which can be foamed and cured at room temperature or under heat at relatively low temperatures in a curing method quite different from the conventional method using acids, to provide foams made from the composition, and to provide a method for producing the foams.
Disclosure of the Invention
Having assiduously studied, we, the present inventors have found that the object can be attained by a curable composition comprising (A) a phenolic compound having a carbon-carbon doublebond, (B) a compound having an SiH group, and (C) a foaming agent.
The component (A) and the component (B) cure at room temperature or at relatively low temperatures through hydrosilylation for addition crosslinking. The component (C) acts as a foaming agent owing to the heat of the reaction, and produces a foam. Specifically, in the invention, the component (C) (foaming agent) absorbs the heat of vaporization or decomposition and prevents any rapid temperature increase during the reaction, and, as a result, foams having a fine cellular structure and a high expansion ratio are obtained. Preferably, the composition of the invention contains a hydrosilylation catalyst as an additional component (D).
The phenolic compound of the component (A) preferably has a molecular backbone comprising at least one structure selected from the following formulae (1) to (3): ##STR1## wherein R.sup.1 represents H or CH.sub.3 ; R.sup.2 and R.sup.3 each represent a divalent substituent having from 1 to 6 carbon atoms; R.sup.4 and R.sup.5 each represent a hydroxyl group and/or a monovalent substituent having from 0 to 6 carbon atoms; X and Y each represent a divalent substituent having from 0 to 10 carbon atoms; n and m each represent an integer of from 0 to 300; l represents an integer of from 1 to 300 and p and q each represent an integer of from 0 to 3. ##STR2## wherein R.sup.1 represents H or CH.sub.3 ; R.sup.6, R.sup.7 and R.sup.8 each represent a divalent substituent having from 1 to 6 carbon atoms; R.sup.9, R.sup.10 and R.sup.11 each represent a hydroxyl group and/or a monovalent substituent having from 0 to 6 carbon atoms; X and Y each represent a divalent substituent having from 0 to 10 carbon atoms; n and m each represent an integer of from 0 to 300 l and s each represent an integer of from 1 to 300; and p, q and r each represent an integer of from 0 to 3. ##STR3## wherein R.sup.1 represents H or CH.sub.3 ; R.sup.12 represents a divalent substituent having from 0 to 6 carbon atoms; R.sup.13 and R.sup.14 each represent a hydroxyl group and/or a monovalent substituent having from 0 to 10 carbon atoms; X and Y each represent a divalent substituent having from 0 to 10 carbon atoms; and n and m each represent an integer of from 0 to 4.
The SiH-having comp
REFERENCES:
Database WPI Week 9313, Derwent Publications Ltd., London, GB; AN 93-106092 XP002102328 & JP 05 047964 A (Sumitomo Bakelite Co)* abstract *.
Database WPI Week 9007, Derwent Publications Ltd., London, GB; AN 90-049160 XP002102329 & JP 02 003409 A (Sumitomo Bakelite Co) * abstract *.
Himeno Koji
Komitsu Shintaro
Nakanishi Naoaki
Acquah Samuel A.
Kaneka Corporation
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