Sekisui Chemical Co., Ltd.

Nagoya University

Hitoshi Shirato

Koichiro Iwasa

Yuji Eguchi

Masami Kamigaito

Shinya Suzuki

Yasuyuki Kori

Hirotake Matsumoto

Kotaro Satoh

Hidekazu Inoue

[1] A &#x3b2;-phellandrene polymer which is a polymerization product of &#x3b2;-phellandrene. [2] The &#x3b2;-phellandrene polymer comprising &#x3b2;-phellandrene units represented by chemical formulae (I-1), (I-2), (II-1) and (II-2), a total amount of the &#x3b2;-phellandrene units being 50% by mass or more. [3] The &#x3b2;-phellandrene polymer, which has a number average molecular weight Mn of 40,000 or more. [4] The &#x3b2;-phellandrene polymer, wherein at least a part of olefinic carbon-carbon double bonds thereof are hydrogenated. [5] The &#x3b2;-phellandrene polymer, which has a glass transition temperature of 80&#xb0; C. or more. 

&#x3b2;-phellandrene polymer, production method for same, and molded article

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

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Tsukuba, Japan

Hitoshi Shirato