| http://www.w3.org/ns/prov#value | - The silicone resin particles suitable for use in the secondary layer of a polymeric film according to the present invention preferably comprise a cross-linked three-dimensional network of siloxane linkages, represented by the structures ##STR1## wherein R is an organic group, such as an aliphatic hydrocarbon e.g. methyl, ethyl or butyl group, or an aromatic hydrocarbon e.g. phenyl group, or an uns
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