Polymeric film comprising filler particles obtained by calcining precursor silicone resin particles
AssigneeImperial Chemical Industries PLC
InventorsPaul D. A. Mills, Junaid A. Siddiqui, Karl Rakos
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Abstract
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.
Claims10
A polymeric film comprising from 0.0005% to 0.5% by weight, based upon the weight of the polymer in the film, of calcined filler particles having a volume distributed median particle diameter of from 0.1 to 12.5 .mu.m, a skeletal density in the range from 1.95 to 2.3 g/cm.sup.3, and a BET specific surface area of less than 80 m.sup.2 /g, the filler particles being obtained by calcining precursor silicone resin particles prior to incorporation into the film polymer.
A polymeric film comprising from 0.0005% to 2% by weight, based upon the weight of the polymer in the film, of calcined filler particles comprising organic groups and silicon atoms present in the ratio in the range from 0.05 to 0.9:1, said filler particles having a volume distributed medium particle diameter of from 0.1 to 12.5 .mu.m.
A polymeric comprising from 0.0005% to 2% by weight, based upon the weight of the polymer in the film, of calcined filler particles obtained by calcining precursor silicone resin particles prior to incorporation into the film polymer, said filler particles having a volume distributed median particle diameter of from 0.1 to 12.5 .mu.m and comprising organic groups and silicon atoms present in the ratio in the range from 0.05 to 0.9:1.
A polymeric film comprising from 0.0005% to 2% by weight, based upon the weight of the polymer in the film, of calcined filler particles comprising a three-dimensional polymer chain structure of the formula
- R.sub.x (OH).sub.y SiO.sub.2-((x+y)/2)
- wherein x is in the range from 0.05 to 0.9, y is in the range from 0 to 1.2 and R represents an organic group, said filler particles having a volume distributed median particle of from 0.1 to 12.5 .mu.m.
Dependencies are inferred from the claim text.