NOVELTY - Thin articles having an abrasion resistant thin film are prepared by applying a photosensitive coating material composition, which comprises a photosetting silicone, (meth)acryloyloxy group-containing monomer, photopolymerisation initiator and an organic solvent, on a base material, by evaporating the organic solvent and by polymerizing and by curing the coated film by exposing to a photoenergy to give a cured coated film having a thickness of less than 3 micron.    DETAILED DESCRIPTION - Thin articles having an abrasion resistant thin film are prepared by applying a photosensitive coating material composition on a base material, by evaporating (D) organic solvent, and by polymerizing and curing the coated film with photoenergy to give a cured film having a thickness of less than 3 micron. The photosensitive coating material composition comprises 10-70 wt. % , as solid content, of (A) photosetting silicone, 30-90 wt. % of (B) monomer having at least one (meth)acryloyloxy group, (C) photopolymerisation initiator and (D) organic solvent. The content of (C) and (D) are each 0.01-10 and 30-2000 parts by weight(pbw) based on 100 pbw of the sum of (A) and (B). The photosetting silicon (A) is prepared by hydrolyzing 40-90 pbw of (a-1) fine particles of colloidal silica and 10-60 pbw of (a-2) monomer of formula (1) and by condensation reaction.    (X-R1)a-Si(R2)b-(OR3)4-a-b (1)    X = methacryloyloxy, acryloyloxy or vinyloxy; R1 = 0-8C straight chain or branched alkyl; R2, R3 = 1-8C straight chain or branched alkyl; a = positive integer of 1-3; b = positive integer of 0-2; a+b = 1-3.    An INDEPENDENT CLAIM is also included for thin articles having an abrasion resistant thin film which are prepared by the same method as defined above except that the photosensitive coating material composition contains (a-3) monomer hydrolysate of formula (2) instead of (1).    (X-R1)a-Si(R2)b-(OH)4-a-b (2)    USE -   The thin film articles are an optical disc, display allied parts, liquid crystal allied parts and solar battery allied parts.    ADVANTAGE -   The thin film has good abrasion resistance, transparency, surface smoothness, heat-resistance, chemical resistance, durability and adhesiveness to a base material.