Production of highly birefringent film

Details Production of highly birefringent film Production of highly birefringent film

1993-06-09

1995-12-12

Acquah, Samuel A.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

5283081, 5283082, 5283083, 528481, 528502B, 528503, 2642107, 26421112, 428480, D01D 512

Patent

active

054747309

ABSTRACT:
A thin, biaxially oriented polyester film which is asymetrically oriented by stretching 1-2 times in the machine direction and about 3-5 times in the transverse direction in the plane of the film is disclosed. The film has a birefringence of at least 0.085, an optical retardation of at least 9000 nanometers and a shrinkage of less than 2% in any direction at 150.degree. C. The film produced is substantially free of color fringes when viewed in partially polarized light. There are also disclosed two processes for the production of said film.

REFERENCES:
patent: 4042569 (1977-08-01), Bell et al.
patent: 4072779 (1978-02-01), Knox et al.
patent: 4497865 (1985-02-01), Minami et al.
patent: 4898786 (1990-02-01), Swofford

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