The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 11, 2022
Filed:
Jul. 25, 2017
Riken Technos Corporation, Tokyo, JP;
Hideaki Yambe, Tokyo, JP;
Kohei Nakashima, Tokyo, JP;
Abstract
Embodiments provide a method for producing a multilayer film, the method including: (A) a step for continuously coextruding from a T die () a molten film () of a multilayer film in which a first acrylic resin layer (α), an aromatic polycarbonate resin layer (β), and a second acrylic resin layer (α) 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 () that rotates or revolves and a second mirror surface body () that rotates or revolves so that the first acrylic resin layer (α) 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 () that rotates or revolves, where TR(surface temperature of first mirror surface body), TR(surface temperature of second mirror surface body), Tα(glass transition temperature of first acrylic resin), Tα(glass transition temperature of second acrylic resin), and Tβ (glass transition temperature of aromatic polycarbonate resin) satisfy a prescribed relationship.