PROBLEM TO BE SOLVED: To provide a method of cast moulding in which a transparent article with non- or very little scattering can be obtained.;SOLUTION: The method of preparing a transparent moulding comprising a blend of a first thermoset polymeric material forming the matrix of the transparent moulding and a second polymeric material dispersed within the first material comprises at least the following stages: (i) preparation of a liquid polymerizable mixture by dissolving the second polymeric material in a thermosetting polymerizable composition that is a precursor of the first thermoset polymeric material, (ii) filling of a mould with the liquid polymerizable mixture obtained in stage (i), (iii) cooling of the liquid polymerizable mixture in the mould to the temperature T less than or equal to 0°C, (iv) initiation of the polymerization of the cooled liquid polymerizable mixture at the temperature T' less than or equal to 0°C, (v) continuation of the polymerization of the liquid polymerizable mixture until a hardened blend of polymers is obtained, and (vi) removal of the moulding formed from the blend of polymers from the mould. The invention also relates to a transparent moulding obtainable by such a method comprising a blend of polymers, at least one of which is a thermosetting polymer.;COPYRIGHT: (C)2009,JPO&INPIT
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