Light-weight polyester film and process for its production

Details Light-weight polyester film and process for its production Light-weight polyester film and process for its production

1992-01-30

1993-04-20

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528272, 528298, 528300, 528301, 528302, 528307, 528308, 5283086, 528310, 528322, 5283291, 525437, 525444, 525448, 525539, 525540, 525 88, 2641761, 2642105, 2642107, 26421112, 26421117, C08F 2000

Patent

active

052044181

ABSTRACT:
A light-weight polyester film which comprises (A) from 50 to 95% by weight of a crystalline polyester resin and (B) from 5 to 50% by weight of a maleimide copolymer, said maleimide copolymer being dispersed in the film in the form of particles having diameters of from 0.1 to 20 .mu.m and fine voids being present in the film, and which has an apparent specific gravity of from 0.3 to 1.1, wherein said maleimide copolymer comprises from 30 to 50 mol % of a maleimide monomer group, from 30 to 70 mol % of an aromatic vinyl monomer group, from 0 to 40 mol % of an unsaturated dicarboxylic anhydride monomer group and from 0 to 40 mol % of other copolymerizable monomer group, and said maleimide copolymer has a glass transition temperature higher by at least 10.degree. C. than the crystalline polyester resin.

REFERENCES:
patent: 4388446 (1983-06-01), Hornbaker et al.

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