Cellulose acylate film, method of producing the same,...

Details Cellulose acylate film, method of producing the same,... Cellulose acylate film, method of producing the same,...

2011-04-26

2011-04-26

Teskin, Fred M (Department: 1762)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

With substrate layer of specified composition

C428S001100, C428S532000, C349S096000, C264S211110, C528S50200C, C536S065000, C536S068000, C527S300000

Reexamination Certificate

active

07931947

ABSTRACT:
An unstretched cellulose acylate film hardly breakable upon stretching can be produced by melt film forming and as a result, a highly oriented stretched cellulose acylate film can be obtained. Using an extruder with a screw compression ratio of 2.5 to 4.5 and an L/D of 20 to 50, a cellulose acylate resin is extruded into a sheet at an extrusion temperature of 190° C. to 240° C. from a die to a cooling drum, and solidified by cooling to prepare an unstretched cellulose acylate film16, which is then stretched to produce a stretched cellulose acylate film.

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English language translation of JP 2002-265636A; publication date: Sep. 18, 2002.
Kokaigiho of Japan Inst of Invention & Innovation, Koki 2001-1745, Mar. 15, 2001, pp. 17-22.

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