Nissan Motor Company Limited

Nippon Zeon Company, Ltd.

Asahi Denka Kogyo K.k.

Tsuchiya Mfg. Co., Ltd.

Acr Co., Ltd.

Tokyo Institute of Technology, Reasearch Laboratory of Precision

Tadashi Ashida

Akira Nakayama

Toshio Nagase

Masahiko Ohnishi

Masao Nakajima

Tsuneo Sakauchi

Yakichi Higo

Takeichiro Takehara

Koichi Handa

Akio Ogawa

Shigetomo Nunomura

Seiichiro Hashimoto

Toshio Takano

Junichiro Matsuoka

Yukio Ohsaki

Shozo Yamamoto

Epoxy resin structural adhesive composition

An epoxy resin adhesive composition has excellent adhesive properties such as impact resistance, tensile shear strength and T-peel strength as well as excellent semi-gelling property. An epoxy resin adhesive composition comprising ionic crosslinking in a polymer utilized as the impact resistance modifier has not only excellent semi-gelling property and mechanical properties of cured products but also excellent storage stability for a long time and it is advantageously utilized when the application occasionally requires storage or standing of the material for one month to one year at the room temperature. The epoxy resin adhesive composition comprises an epoxy resin, a powder core/shell polymer and a heat activation type hardener for epoxy resins. The powder core/shell polymer is composed of a core comprising an acrylate polymer or a methacrylate polymer having a glass transition temperature of -30.degree. C. or lower and a shell comprising an acrylate polymer or a methacrylate polymer comprising crosslinking monomer units having a glass transition temperature of 70.degree. C. or higher and weight ratio of the core to the shell is in the range from 10/1 to 1/4.

Epoxy resin adhesive composition

A curable epoxy resin composition comprises (I) an epoxy resin and (II) a curing agent. It may comprise (III) another curing agent. It is preferable for it to comprise 25 to 95 wt.% of (I) and 5 to 45 wt.% of (II).

Curable epoxy resin composition for structural parts containing

The coherence between inputted and received white noise is used to determined the presence or absence of flaws in a structure such as a joint. The strength of the joint is determined by integrating the coherence factor and observing the magnitude of the same.

Non-destructive inspection method

In making a peripheral joint between first and second metal panels such as, e.g., outer and inner panels of an automobile door by hemming the first panel after application of a rust preventive sealant, the sealant is used in a quantity in excess of just sufficiency for completely filling in gaps in the joint to ensure that the excess portion of the sealant is pressed out of the joint by the end of the hemming operation, and the press die member used in the hemming working is formed with a groove in its hemming surface such that the sealant pressed out of the joint is confined within a space defined by the groove and shaped in conformance with the shape of the groove so as to serve as an external seal which closely covers the edge of the hemmed marginal part of the first panel.

Method of making a rust preventive hemmed joint between two metal panels

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Yokohama, Japan

Tadashi Ashida