Sekisui Chemical Co., Ltd.

Hirotake Matsumoto

Akihiko Fujiwara

Akihiro Niki

Juichi Fukatani

Shoji Nozato

Yasuhiro Nakatani

Hitoshi Shirato

Hidekazu Inoue

It is an object of the present invention to provide a release film which is superior in the flexibility at high temperature, the conformability to circuit patterns, the heat resistance, the releasing property and the non-contaminative property, and easily discarded after use. The present invention relates to a release film, which is used in a manufacturing process of a printed-circuit board, a flexible printed-circuit board or a multilayer printed-circuit board, having a layer comprising a resin composition comprising a resin having a polar group in a main chain as a matrix and having a halogen content of 5% by weight or less on at least one surface.

Release film

The present invention presents a thermoplastic elastomer that exhibits superior moisture permeability, excellent flexibility and mechanical properties at a high temperature, particularly settling resistance at a high temperature, and excellent moisture permeability. The thermoplastic elastomer includes, as a constituting unit, a polyether component (A) and a polyester component (B), wherein the polyether component (A) includes poly-oxyalkylene groups (&#x2014;CHO&#x2014;) having a carbon/oxygen atomic ratio in a range from 2.0 to 2.5, the polyester component (B) has a number-average molecular weight in a range from 500 to 10,000, the thermoplastic elastomer has a content of polyether component (A) in a range from 50 to 95 weight %, and the thermoplastic elastomer has a glass transition temperature of not more than &#x2212;20&#xb0; C.

Thermoplastic elastomer, use thereof, and process for producing the same

Polyesterurethane elastomers and process for their production

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Mishima-gun, Japan

Hirotake Matsumoto