Threebond Co., Ltd.

Atsushi Okuma

Shuji Mochizuki

Katsunori Haruna

Miwako Ota

Kazuhide Fukuda

An anaerobic composition comprising a polymerizable monomer having at least one ethylenic double bond, a free radical initiator and at least one azole compound.

Anaerobic compositions

An anaerobically curing adhesive sealing composition comprising (A) a mono(meth)acrylate monomer represented by formula (I) ##STR1## wherein R.sub.1 represents a hydrogen atom or a methyl group; and R.sub.2 represents ##STR2## and (B) a (meth)acrylate prepolymer having a urethane structure in the main chain thereof and having an average molecular weight of 10,000 or more and further containing (C) a (meth)acrylate prepolymer having a urethane structure in the main chain thereof and an average molecular weight of at most 5,000. The sealing composition exhibits, upon curing, excellent elasticity and properties to follow an adherend while retaining excellent resistance to oil and heat as possessed by acrylate type reactive sealing compositions.

Anaerobically curing adhesive sealing composition

A primer for .alpha.-cyanoacrylate-based resin compositions, which is disclosed herein, comprises (A) a compound selected from the group consisting of benzene ring compounds having aldehyde group and nitrogen or oxygen atom-containing heterocyclic compounds having aldehyde group, and (B) an organic amine compound. In bonding, coating or printing various non-polar or highly crystallized resins, the primer exhibits a high bonding strength by a simple procedure.

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Tokyo, Japan

Atsushi Okuma