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Title:
METHACRYLIC COPOLYMER, COMPOSITION, SHAPED OBJECT, METHOD FOR PRODUCING FILM OR SHEET, AND LAYERED PRODUCT
Document Type and Number:
WIPO Patent Application WO/2021/193521
Kind Code:
A1
Abstract:
The present invention provides a methacrylic copolymer which comprises 40-87 mass% methyl methacrylate units, 6-30 mass% structural units (R) having at least one ring structure in the main chain and selected from the group consisting of lactone ring units, glutaric anhydride units, and N-substituted or unsubstituted glutarimide units, and 7-30 mass% α-methylstyrene units and which has a glass transition temperature of 120°C or higher. The methacrylic copolymer has a negative value of photoelasticity coefficient, and a sheet of the methacrylic copolymer having dimensions of 20 mm × 40 mm × 1.0 mm (thickness), when unidirectionally stretched 100% at a rate of 3 mm/min and a temperature higher by 10°C than the glass transition temperature, gives a stretched film which has a positive orientational birefringence.

Inventors:
UMEDA YASUNARI (JP)
NOMOTO YUSAKU (JP)
Application Number:
PCT/JP2021/011682
Publication Date:
September 30, 2021
Filing Date:
March 22, 2021
Export Citation:
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Assignee:
KURARAY CO (JP)
International Classes:
C08F8/16; C08F8/32; C08F220/14; C08J5/18; C08L33/12; C08L101/00; C08F222/04; C08F222/40
Domestic Patent References:
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Attorney, Agent or Firm:
SAEGUSA & PARTNERS (JP)
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