| http://www.w3.org/ns/prov#value | - agent comprises a linear crystallisable polyester having a melting point above about 150 C, e.g. polyethylene terephthalate, 0.1 to 3 wt% of certain esters of carboxylic acids, e.g. PETS, and 0.1 to 3 wt% of a synergistic agent selected from (a) alkali and alkaline earth metal salts of certain organic acids; (b) talc; and (c) asbestos (Claims 1 and 3).
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