Abstract: The present invention is a curable resin composition comprising a copolymer (A) represented by the following general formula (1), silica fine particles (B), a reactive monomer (C) and a polymerization initiator (D). In the general formula (1), X is an atomic group formed by removing “k” mercapto groups from a multifunctional thiol compound having at least “k” mercapto groups; Y is a monovalent organic group derived from a copolymer formed by copolymerizing unsaturated monomers; and “k” is an integer of 3 to 10. The present invention can provide a hard coat agent which has low curing shrinkage and which has both low curing shrinkage and antiblocking properties as needed; a hard coat film and a hard-coat treated plastic substrate having high pencil hardness and low curling properties, by using this hard coat agent.

Abstract: The invention has an object of providing paint compositions showing excellent performances in both scratch resistance and impact resistance, and processes for forming multilayer paint films using the paint composition. The invention has another object of providing paint compositions suitably used as clear paints for finish painting automobiles and the like, and highly solidifiable paint compositions. A paint composition according to the invention includes a polyisocyanate prepolymer (A) including a monomer unit of Formula (1) below and a polyol (B), and has an average functional group equivalent weight of 160 to 400 g/eq. A process for forming multilayer paint films involves the paint composition. wherein R1 is a hydrogen atom or a methyl group; n is an integer of 0 or 1; when n=0, l=0, p=1 and m is an integer of 1 to 8; and when n=1, m=2, l=2 and p is an integer of 1 to 4.

Abstract: The present invention relates to a curable composition having high adhesiveness and transparency, comprising a thiol compound containing two or more groups represented by formula (1): wherein the symbols in the formula have the meanings as described in the specification; and an urethane compound containing an ethylenically unsaturated double bond represented by formula (2): wherein the symbols in the formula have the meanings as described in the specification.

Abstract: A process for preparing tetrafluorobenzene carbaldehyde alkyl acetal represented by the following formula (II), comprising reducing tetrafluorocyanobenzene represented by the following formula (I) with a metal catalyst containing a platinum group metal in the presence of an alkyl alcohol represented by R—OH (R is an alkyl group of 1 to 4 carbon atoms) and an acid; (I) wherein m is 1 or 2, n is 0 or 1, and m+n is 2, (II) wherein m and n are the same as those in the formula (I), and R is an alkyl group of 1 to 4 carbon atoms.

Abstract: A process for preparing tetrafluorobenzene carbaldehyde alkyl acetal represented by the following formula (II), comprising reducing tetrafluorocyanobenzene represented by the following formula (I) with a metal catalyst containing a platinum group metal in the presence of an alkyl alcohol represented by R—OH (R is an alkyl group of 1 to 4 carbon atoms) and an acid; (I) wherein m is 1 or 2, n is 0 or 1, and m+n is 2, (II) wherein m and n are the same as those in the formula (I), and R is an alkyl group of 1 to 4 carbon atoms.

Abstract: A polymerization accelerator includes a specific thiol compound. A curable composition of excellent thermal stability contains the polymerization accelerator. A cured product is obtained from the curable composition. The polymerization accelerator includes a thiol compound having two or more groups represented by Formula (1) below: wherein R1 is a hydrogen atom or a C1-10 alkyl group, and m is an integer of 0, 1 or 2.

Abstract: The present invention relates to a curable composition having high adhesiveness and transparency, comprising a thiol compound containing two or more groups represented by formula (1): wherein the symbols in the formula have the meanings as described in the specification; and an urethane compound containing an ethylenically unsaturated double bond represented by formula (2): wherein the symbols in the formula have the meanings as described in the specification.