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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2018/042952
Kind Code:
The present invention is a method for producing a multilayer film, the method including: (A) a step for continuously coextruding from a T die (3) a molten film (4) of a multilayer film in which a first acrylic resin layer (α1), an aromatic polycarbonate resin layer (β), and a second acrylic resin layer (α2) are directly laminated in the stated order using a coextrusion apparatus; (B) a step for feeding and pressing the molten film of the multilayer film between a first mirror surface body (5) that rotates or revolves and a second mirror surface body (6) that rotates or revolves so that the first acrylic resin layer (α1) is disposed on the first-mirror-surface-body side; and (C) a step for holding the pressed multilayer film against the first mirror surface body and sends the pressed multilayer film to the subsequent third mirror surface body (8) that rotates or revolves, where TR1 (surface temperature of first mirror surface body), TR2 (surface temperature of second mirror surface body), Tα1 (glass transition temperature of first acrylic resin), Tα2 (glass transition temperature of second acrylic resin), and Tβ (glass transition temperature of aromatic polycarbonate resin) satisfy a prescribed relationship.

YAMBE Hideaki (2-101 Kanda-Awajicho, Chiyoda-k, Tokyo 36, 〒1018336, JP)
NAKASHIMA Kohei (2-101 Kanda-Awajicho, Chiyoda-k, Tokyo 36, 〒1018336, JP)
Application Number:
Publication Date:
March 08, 2018
Filing Date:
July 25, 2017
Export Citation:
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RIKEN TECHNOS CORPORATION (2-101, Kanda-Awajicho Chiyoda-k, Tokyo 36, 〒1018336, JP)
International Classes:
B29C47/88; B29C47/06; B32B27/30; B32B27/36
Attorney, Agent or Firm:
ASAMURA PATENT OFFICE, P.C. (Tennoz Central Tower, 2-2-24 Higashi-Shinagawa Shinagawa-k, Tokyo 76, 〒1408776, JP)
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