Mitsubishi Gas Chemical Company, Inc.

Shoichi Inoue

Susumu Taniyama

Goro Shimaoka

Hiromitsu Takanohashi

A method is herein disclosed for curing an organoalkoxysilane compound characterized by using as a catalyst at least one compound selected from the group consisting of a phosphite of the formula:

Method of curing an organoalkoxysilane compound

A method of treating the surface of a shaped article of a polycarbonate resin, which comprises coating the shaped article of the polycarbonate resin with a specific pre-treating solution (I), air-drying the coated article, then coating the article with a specific coating composition (II), and heat-curing the coated article. The pre-treating solution (I) contains a bisphenol type epoxy resin in a mixed solvent of a lower alcohol and an alkyl ether of ethylene glycol, and the coating composition (II) comprises (A) a reaction mixture of an aminoalkylalkoxy silane of the formula (1) with an epoxyalkylalkoxy silane of the formula (2); (B) a mixture of an alkyl-modified methylol melamine of the formula (3) with an alkyd resin; and (C) an acrylic acid derivative of the formula (5) or its polymer of a low degree of polymerization, the formulas (1), (2), (3) and (5) being given in the claim.

Method of treating the surfaces of shaped articles of polycarbonate

A surface-treating paint for shaped plastic articles, said paint being the reaction product of

Surface-treating paint for shaped plastic articles

A surface-coating composition for plastic articles, which comprises as a film-forming agent (A) a mixture of the reaction of an aminoalkylalkoxy silane of the general formula ##STR1## WHEREIN R.sup.1 represents a divalent hydrocarbon group containing 1 to 4 carbon atoms, R.sup.2 and R.sup.3 represent a monovalent hydrocarbon group containing 1 to 4 carbon atoms, Z represents a hydrogen atom or an aminoalkyl group, and n is 0 or 1, with an epoxyalkylalkoxy silane of the general formula ##STR2## WHEREIN R.sup.1, R.sup.2 and R.sup.3 are as defined above, Q represents a glycidoxy group ##STR3## or an epoxycyclohexyl group, and m is 0 or 1, and (B) a mixture of an alkyl-modified methylol melamine of the general formula ##STR4## wherein R.sup.4, R.sup.5, R.sup.6, R.sup.7, R.sup.8 and R.sup.9 represent a hydrogen atom or a monovalent hydrocarbon group with 1 to 4 carbon atoms, and an alkyd resin; the amount of component (A) being 45 to 80% by weight, and the amount of component (B) being 20 to 55% by weight, both based on the total amount of components (A) and (B). The composition may further contain (C) an acrylic acid derivative of the general formula ##STR5## wherein R.sup.10 represents a hydrogen atom or a methyl group, and R.sup.11 represents a hydrogen atom, a hydrocarbon group containing 1 to 4 carbon atoms, a hydroxyalkyl group or a glycidyl group, or its polymer of a low degree of polymerization, the amount of component (C) being 5 to 30% by weight based on the total amount of components (A), (B) and (C).

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Itami, Japan

Shoichi Inoue