Method of producing an acylated cellulose film

Details Method of producing an acylated cellulose film Method of producing an acylated cellulose film

1995-06-06

1997-12-09

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Light polarizing article or holographic article

264 85, 264217, 264 26, 359 73, 428 1, 524108, B29D 1100

Patent

active

056956940

ABSTRACT:
An acylated cellulose film having a high optical isotropy and uniformity is produced by dissolving an acylated cellulose in a solvent substantially free from water and including, as a principal component, 1,3-dioxolane in a ratio in weight of the acylated cellulose to the solvent of 10/250 to 10/15; spreading the acylated cellulose solution on a film-forming surface of a support; and drying, for example, initially drying the spread solution layer on film-forming surface so as to reduce the content of the residual solvent in the resultant film to 5 to 30% by weight; removing the resultant residual solvent-containing film from the film-forming surface; and finally drying the removed film, while allowing the film to shrink in the transversal direction thereof, at a drying temperature controlled continuously or intermittently to a level satisfying the relationship (I): (Tg'-50.degree. C.).ltoreq.T.ltoreq.(Tg'+20.degree. C.) (I), wherein T is the drying temperature (.degree.C.) and Tg' is a glass transition temperature (.degree.C.) of the solvent-containing film, the temperature Tg' varying in response to the solvent content in the film.

REFERENCES:
patent: 2319051 (1943-05-01), Fordyee et al.
patent: 2512490 (1950-06-01), Drisch et al.
patent: 3290286 (1966-12-01), Kesting
patent: 5152947 (1992-10-01), Takeda et al.
patent: 5478518 (1995-12-01), Taketani et al.

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