Imperial Chemical Industries Limited

Ici Americas, Inc.

Paul D Mills

Junaid Ahmed Siddiqui

Anton R Olek

Karl Rakos

Junaid A Siddioui

The present invention relates to films or sheets of linear polyester having incorporated therein a combination of glass spheres and calcined clay having certain particle sizes and present in specific amounts based upon the weight of the polyester film. The addition of these fillers improves several properties of the film, including the handleability while maintaining acceptable optical clarity and transparency and to the method of making such films or sheets.

Polyester films containing glass spheres and calcined china clay

A polymeric film comprising from 0.0005% to 2% by weight, based upon the weight of the polymer in the film, of filler particles having a volume distributed median particle diameter of from 0.1 to 12.5 .mu.m, the filler particles being obtainable by calcining precursor silicone resin particles prior to incorporation into the film polymer.

Polymeric film comprising filler particles obtained by calcining

A polymeric film comprising a first layer of polymeric material having on at least one surface thereof a second layer of polymeric material comprising, based upon the weight of the polymer in the second layer, (a) 0.05% to 2.0% by weight of silicone resin particles and/or calcined silicone resin particles having a volume distributed median particle diameter of 1.5 to 12.5 .mu.m, and (b) 0.005% to 1.0% by weight of china clay particles having a volume distributed median particle diameter of 0.1 to 2.0 .mu.m.

Polymeric film having a layer comprising calcined silicone particles and

Polymeric film

A polyester film comprising an essentially unfilled primary layer and a filled secondary layer exhibiting an improved combination of transparency and handling properties. The filler is silicone resin particles having a volume distributed median particle diameter of 1.9 to 3.5 .mu.m, which are present in the secondary layer at a concentration of 200 to 400 ppm, in combination with silicone resin particles having a volume distributed median particle diameter of 0.6 to 0.9 .mu.m, which are present in the secondary layer at a concentration of 100 to 250 ppm. The film is suitable for use in a wide range of applications, particularly for information storage and display.

Polymeric film containing silicone resin particles

A polymeric film, particularly a polyester film, comprising an essentially unfilled primary layer substrate and a filled secondary layer exhibiting an improved combination of transparency and handling properties. The filler is glass particles having a volume distributed median particle diameter of 1.0 to 7.0 .mu.m, which are present in the secondary layer at a concentration of 100 to 1000 ppm. The film is suitable for use in a vide range of applications, particularly for information storage and display.

A polymeric film, particularly a polyester film, comprising an essentially unfilled primary layer substrate and a filled secondary layer exhibiting an improved combination of transparency and handling properties. The filler is a mixture of glass and silica particles. The glass particles have a volume distributed median particle diameter of 1.0 to 7.0 .mu.m and are present in the secondary layer at a concentration of 50 to 1000 ppm, while the silica particles are present in the range 200 to 2000 ppm and have an average primary particle size of 0.01 to 0.09 .mu.m. The film is suitable for use in a wide range of applications, particularly for information storage and display.

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Darlington, United Kingdom

Paul D Mills