Ciba-geigy Corporation

Kurara Co., Ltd.

Hiroshi Uchida

Makoto Shiraishi

Yoshinori Koizumi

Akihiro Izumi

Akira Saito

An epoxy resin composition characterized by comprising (A) an epoxy resin containing an oxazolidone ring, (B) a halogen-containing epoxy resin and (C) a curing agent as its ingredients, wherein the ratio by weight of ingredients (A) to (B) is 5-100:95-0, the hydrolizable chlorine content of ingredients (A) and (B) is no more than 500 ppm and the amount of .alpha.-glycol is no more than 100 m eq/kg has excellent properties and can be employed as the materials for electronic applications and as paints, adhesives, molding materials, composite materials, laminates and sealing materials.

Urethane modified epoxy resin compositions

A reaction product formed between an epoxy resin, a phenol compound such as bisphenol or the like and an isocyanate compound contains oxazolidone rings and it is a polymeric epoxy resin. Herein is provided an epoxy resin composition comprising said reaction product and a curing agent. The said reaction product contains oxazolidone rings and epoxy groups, and is excellent in heat resistance and adhesive property. Further said reaction product is made into a polymer by the use of the bisphenol compound and at the same time it contains oxazolidone rings; it is excellent in toughness and water resistance. When a tetrabromobisphenol is used as the bisphenol compound, flame retardance is also good. Accordingly, the epoxy resin composition of the present invention is excellent in heat resistance, toughness, adhesive property and water resistance. When a brominated compound is used as the phenol compound, the epoxy resin composition of the invention exhibits an excellent flame retardance.

A method for suspension polymerizing vinyl chloride monomer, or a mixture thereof with copolymerizable monomers, employs as a suspension stabilizer a partially saponified polyvinyl alcohol having a degree of saponification between about 60 and about 90 mol percent, and a solubility-in-methanol index at 55.degree. C. in a range of up to about 60 percent.

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Kurashiki, Japan

Hiroshi Uchida