Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1990-10-29
1996-12-03
Zitomer, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525102, 525106, 5253265, 5253297, 5253303, 5253319, 5253331, 5253337, 525342, 525474, 525479, 528 10, 528 12, 528 31, 528 33, 528 35, C08F29908
Patent
active
055809251
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an organic polymer having a hydrosilyl group, a preparation thereof, and a curable composition comprising said polymer.
BACKGROUND ART
Hitherto, various curable liquid compositions which are cured to give rubbery materials have been developed. Among them, a curing system having good depth curability has been developed, which system is prepared by cross-linking a polyorganosiloxane having on the average two or more vinyl groups at a molecular end or in a molecular chain of one molecule, with a polyorganohydrogensiloxane having two or more hydrogen atoms bonded to silicon atoms in one molecule. Such a system is used as a sealing agent or a potting agent by utilizing its good weather resistance, water resistance and thermal resistance. However, such systems have limited applications because the cost is high, the adhesion property is not good and fungus easily grows. Further, said polyorganosiloxane generally has poor comparability with an organic polymer. When a polyorganohydrogensiloxane and an organic polymer having an alkenyl group are intended to be cured, hydrolysis and dehydrogenation condensation reaction of the polyorganohydrogensiloxane increase due to phase separation, and sufficient mechanical properties are not achieved because of voids.
DISCLOSURE OF THE INVENTION
As the result of an extensive study under such circumstances, the present invention solves these problems. The present invention provides a curable liquid composition having rapid curability, good depth curability and good mechanical properties, an organic polymer having a hydrosilyl group in a molecule which is suitable to give such composition, and preparation of the polymer.
The first aspect of the present invention resides in an organic polymer having at least two hydrosilyl groups in the molecule and having a molecular weight of from 500 to 50,000.
The second aspect of the present invention resides in a method for preparing a hydrosilyl group-containing organic polymer having a molecular weight of from 500 to 50,000 which comprises reacting (A) an organic polymer having at least one alkenyl group in the molecule with (B) a polyvalent hydrogensilicon compound in the presence of a hydrosilylation catalyst so that the hydrosilyl group remains after the reaction.
The third aspect of the present invention resides in a curable composition which comprises molecule, and
Polymers having various backbones can be used as the organic polymer having at least two hydrosilyl groups in a molecule and having the molecular weight of from 500 to 50,000 according to the first aspect of the present invention.
For example, a polyether polymer, a polyester polymer, a hydrocarbon polymer, a (meth)acrylate ester polymer and a polycarbonate polymer are mentioned.
Specific examples of the polyether polymer are those having the backbone comprising a repeating unit of, for example, ##STR1##
The polyether polymer may comprise one kind of the repeating unit or a combination of two or more kinds of the repeating unit. Specific examples of the polymer are polyoxyethylene, polyoxypropylene, polyoxytetramethylene and polyoxyethylene/polyoxypropylene copolymer. The polyether polymer may be a linear or branched one.
The polyester polymer may have the backbone prepared by, for example, polycondensing a polybasic acid and polyhydric alcohol by a direct esterification, a transesterification or the like. Concretely, the following components may be polycondensed, but the present invention is not restricted to them.
Ethylene glycol, propylene glycol, butanediol, hexamethylene glycol, hydrogenated bisphenol A, neopentyl glycol, polybutadienediol, diethylene glycol, triethylene glycol and dipropylene glycol
Glycerol, trimethylolmethane, trimethylolpropane and pentaerythritol
Phthalic acid, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid, tetrachlorophthalic acid, polybutadiene dicarboxylic acid, oxalic acid, malonic acid, succinic acid, adipic acid, sebacic acid, maleic acid, f
REFERENCES:
patent: 4334036 (1982-06-01), Yonezawa
patent: 4520160 (1985-05-01), Brown
Patent Abstracts of Japan, vol. 8, No. 62, Mar. 23, 1984, JPA 58-217505.
Patent Abstracts of Japan, vol. 12, No. 202, Jun. 10, 1988, JPA 63-6041.
Chemicals Patents Index, Basic Abstracts Jnl., SectionA, week 8619, Jul. 2, 19876, JPA 86-121878.
Chiba Makato
Iwahara Takahisa
Takahara Tomoko
Yonezawa Kazuya
Kanegafuchi Chemical Industry Co. Ltd.
Zitomer Fred
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