Kabushiki Kaisha Alpha Giken

Osaka Yuki Kagako Kogyo Kabushiki Kaisha

Eisuke Hirakawa

Minoru Fukuzawa

Akio Tani

Shinobu Nishimoto

Takashi Kato

The invention provides a shaped resin article for optical use which is a three-dimensional reaction product cast from a molding composition essentially comprising a tetrahalobisphenol A epichlorohydrin polycondensate-(meth)acrylic acid adduct (A) and a polyisocyanate compound (B). In another aspect of the invention, the resin article is cast from a composition containing a styrenic or ester monomer (C) in addition to (A) and (B). In still another aspect, the resin article is cast from a composition containing a phenolic compound (D) in addition to (A), (B) and (C).

Optical resin articles

A 2-cyanoacrylate composition which comprises (A) a 2-cyanoacrylate compound and (B) a carbonate compound selected from the group consisting of dialkyl carbonates, alkylene carbonates, alkyne carbonates, alkylene glycol bisalkyl carbonates and trihydric alcohol trisalkyl carbonates.

2-cyanoacrylate-carbonate composition

.alpha.-cyanoacrylate compounds expressed by the following general formula: ##STR1## wherein R.sup.1 designates --CH.sub.2 -- or ##STR2## and R.sup.2 designates alkyl groups, alkenyl groups or alkynyl groups of C.sub.1 to C.sub.4. These compounds are preferably synthesized by the reaction of the compounds expressed by the following general formula: ##STR3## wherein R.sup.1 and R.sup.2 are same as the above described, with formaldehyde products and then the depolymerization of the resulting dehydrating condensation polymers. These compounds are effectively used as fast-setting adhesives.

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Kyoto, Japan

Eisuke Hirakawa