Film having fine voids and manufacture thereof

Details Film having fine voids and manufacture thereof Film having fine voids and manufacture thereof

1997-11-10

1998-12-01

Pezzuto, Helen L.

Stock material or miscellaneous articles

Composite

Of polyester

4283155, 428480, 525177, B32B 2706

Patent

active

058435786

ABSTRACT:
A polyester film having fine voids, which comprises a polymer mixture comprising a polyester resin and a thermoplastic resin (B) incompatible with said polyester resin, and which has an apparent specific gravity of 0.6-1.3 and an inplane birefringence as determined from the equation:

REFERENCES:
patent: 4871784 (1989-10-01), Otonari et al.

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