Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1996-07-17
1998-02-10
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523213, 524781, 524783, 524785, 524788, 525104, 525106, 525477, 528 38, C08K 906
Patent
active
057170096
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to an adhesive composition which cures in a rubbery state and a process for curing the same. More specifically it relates to an adhesive silicone rubber composition which has an excellent curing rate, deep portion curing property and adhesiveness and is suitable for use as an adhesive or sealing material, and a process for curing the same.
Compositions which cure in a rubbery state by a condensation reaction of a polyorganosiloxane having a silanol group and a silane or siloxane having a silicon functional group have been widely used for parts of automobiles, parts of electric and electronic instruments, etc. by utilizing excellent characteristics such as heat resistance, weather resistance, electric characteristics, etc. Particularly, the above compositions in a deacetic acid curing type, deoximation curing type and deacetone curing type have excellent adhesiveness in addition to the above characteristics so that a high value as an adhesive or sealing material is set on them.
In order to improve the adhesiveness of these adhesive silicone rubber compositions, various proposals have been made. For example, in Japanese Patent Publication No. 11272/1971, it has been disclosed that adhesiveness to various adherends is improved by formulating an alkoxysilane having an amino group into a deoximation type adhesive silicone rubber composition. Further, for the same purpose, there have been disclosed a formulation of a silyl ester such as silyl maleate, silyl fumarate, silyl succinate, etc. containing a trimethoxysilyl group in Japanese Provisional Patent Publication No. 20032/1981 and a formulation of an alkoxysilane having an amino group bonded to a silicon atom through a 2-(p-benzyl)ethyl group in Japanese Patent Publication No. 35373/1985.
It has been proposed that by formulating such an adhesiveness-improving agent into a dealcoholation type composition which is said to be non-adhesive although it is a condensation reaction type silicone rubber composition, or combining a special curing catalyst with an adhesiveness-improving agent, adhesiveness is imparted to obtain an adhesive silicone rubber composition. For example, in Japanese Provisional Patent Publication No. 21157/1986, it has been disclosed that a silane containing 3 amino-nitrogen atoms such as composition having such a curing mechanism to impart adhesiveness. Also, in Japanese. Provisional Patent Publication No. 15900/1973, it has been disclosed that an adhesive composition is obtained according to the same curing mechanism by using a titanium chelate compound as a curing catalyst and using an organosilicon compound in which an alkoxysilyl group is bonded to an isocyanuric ring through a carbon chain, as an adhesiveness-improving agent.
However, all of such condensation reaction type adhesive silicone rubber compositions are the type which react with water (moisture) in the air by a catalytic action of an organic compound having a metal atom in a molecule, including an organic acid salt of a metal such as tin, etc., a dialkyltin dialiphatic acid salt, dialkyltin dialkoxide, dialkyltin oxide, titanium tetraalkoxide and a partially hydrolyzed product thereof, a titanium chelate compound, a zirconium chelate compound, an aluminum trialkoxide and a partially hydrolyzed condensate thereof, and an aluminum chelate compound, etc. and are cured gradually from a surface to an inner portion. Therefore, the curing time is long Additionally, it may not cure properly, particularly when it is used for adhesion of a thick portion or a portion into which water in the air is difficultly permeated. For example, 7 to 10 days are required for curing a composition having a thickness of 10 mm, and about one month is required for curing a composition having a thickness of 20 mm.
When such an adhesive silicone rubber is put to practical use as an adhesive or sealing material, limitations in steps frequently occur because of a long curing time, particularly poor curing occurs in thick portions as described above. For exam
REFERENCES:
patent: 3890271 (1975-06-01), Kokoszka
patent: 4602078 (1986-07-01), Joseph et al.
patent: 4797446 (1989-01-01), Dietlein et al.
patent: 5300611 (1994-04-01), Fujioka et al.
Kobayashi Fumihiko
Matsushita Shigeki
Marquis Melvyn I.
Toshiba Silicone Co. Ltd.
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