Patent ID: 7169828

Claim:
A method of manufacturing a replica, which method comprises the provision of a polymerizable resin composition between a front mold having a pre-shaped surface, and a back mold having a pre-shaped surface, carrying out a curing treatment and removing the replica thus manufactured from the molds, which replica comprises a solid body onto which the shape of the surface of the front mold and the shape of the surface of the back mold have been reproduced, characterized in that the curing treatment is a UV-light initiated cationic polymerization, the resin composition used being a compound comprising at least two cationically polymerizable cyclic ether groups, which only shows signs of gelation when at least 30% of the conversion that can be achieved in the mold under the relevant curing conditions has taken place, wherein, the resin composition comprises a compound having the following general formula: wherein: Y=—O—, —SO 2 —, —CH 2 —, —C(CF 3 ) 2 —, —C(CH 3 ) 2 —, —C(═O)—, —O—C(═O)—, —O—C(═O)—O—, X=a halogen or CH 3 , R 1 =—CH 2 —, —C(CH 3 ) 2 —, R 2 =—OCH 2 CH 2 —, —OCCH 3 HCH 2 —, —OCH 2 CCH 3 H—, —OCH 2 CHOHCH 2 —, R 3 =H, C n H 2n+1 , n=an integer ≧1. p=1–4, m, a, b, c are each individual integers in the range from 0–4.