液晶ディスプレイ保護板の製造方法

Title:

液晶ディスプレイ保護板の製造方法

Document Type and Number:

Japanese Patent JP6542780

Kind Code:

B2

Abstract:

The present invention provides a method for manufacturing a liquid crystal display protection plate in which the in-plane retardation value is controlled so as to be within a predetermined range. The manufacturing method includes: extruding a thermoplastic resin laminated body in a molten state from a T-die (11), the thermoplastic resin laminated body being a polycarbonate resin layer on which a methacrylic resin layer is laminated on at least one surface of the polycarbonate resin layer; pinching the thermoplastic resin laminated body between a first cooling roll (12) and a second cooling roll (13) while forming a bank therebetween; cooling the thermoplastic resin laminated body by winding the thermoplastic resin laminated body around the second cooling roll (13) and a third cooling roll (14); and forming a resin plate (16) by taking up the thermoplastic resin laminated body with a take-up roll (15). Subsequently, after undergoing a process of heating the resin plate (16) for 1 minute or more at a temperature of 50°C or more, the liquid crystal display protection plate is manufactured. The in-plane retardation value of the liquid crystal display protection plate is 50 to 210 nm and the decreasing rate of the in-plane retardation value of the liquid crystal display protection plate with respect to the in-plane retardation value of the resin plate (16) before heating is 5% or more.

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Inventors:

Yoji Ono
Kazuo Funazaki

Application Number:

JP2016547693A

Publication Date:

July 10, 2019

Filing Date:

September 07, 2015

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