Imperial Chemical Industries Limited

Peter G Knowles

Gordon E Pears

Carl F Mathews

Christopher Deverell

Mohanlal S Nerurkar

Polyester films containing 0.2 to 0.9% by weight of filler particles having a nominal particle size of 2 to 10 .mu.m and a hardness of 2.5 to 7 on the moh scale are suitable for the production of slot liners and closures. The films have improved resistance to fibrillation or delamination and tearing during the formation of the slot liners and closures and improved slip properties to promote their insertion into electrical stators and rotors.

Polyester films containing substantially spherical particles useful as

Opaque voided films having a total luminous transmission not exceeding 25% are made from blends of a polyester preferably polyethylene terephthalate, with 3 to 27% of an ethylene or propylene polymer, prepared by dry blending. One end use of the film, as a base for photographic prints is also described.

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Luton, United Kingdom

Peter G Knowles