Abstract: In the present invention I, it was able to develop by water, and water resistance is improved in a cured coating layer owing to a photocurable resin composition containing a resin having hydroxyl groups and a polymerizable unsaturated groups, a photopolymerizable initiator, and a photo-polymerizable monomer, and it becomes unnecessary to conduct pH control of a developer which is problematic in alkali development.

Abstract: A polyurethane resin obtained from a diisocyanate compound and a polyester polyol. The polyester polyol may (1) comprise not less than 50% by weight of a polyester glycol having a molecular weight of 500-5,000, the polyester glycol being obtained by reacting an acid and 3,3,5-trimethyl-1,6-hexanediol or 2,2,4-trimethyl-1,6-hexanediol and have a molecular weight of 500-5,000, (2) have a number average molecular weight of 500-5,000 and an alcohol hydroxyl group at terminals thereof and comprise not less than 50% by weight of ester units, the ester units being derived from a dicarboxylic acid and 3,3,5-trimethyl-1,6-hexanediol and/or 2,2,4-trimethyl-1,6-hexanediol, or (3) have a number-average molecular weight of 500-5,000 and comprise not less than 50% by weight of ester units of an aliphatic dicarboxylic acid and trimethyl-1,6-hexanediols.

Abstract: The present invention relates to a surface-coated plastic product which has excellent durability such as weatherability, scratch resistance and thermal stability.The present invention relates to, for example, a surface-coated plastic product of a resin selected from the group composed of a polycarbonate resin, an ABS resin, an acrylic resin, a polyvinyl chloride resin, a polyamide resin, a polyphenylene oxide resin or a resin alloy containing these, coated with a coating composed of a curable resin composition containing 100 parts by weight of an acrylic resin of a weight average molecular weight of 2,000 to 30,000, 0.01 to 10 parts in weight of an organometallic compound, 0.01 to 10 parts in weight of a silicon compound containing a silanol group or capable of forming a silanol group by heating or photo-irradiation and 0.01 to 10 parts by weight of a UV absorbent.

Abstract: .epsilon.-caprolactone-modified hydroxyalkyl acrylate or methyacrylate can be effectively produced from .epsilon.-caprolactone and a hydroxyalkyl acrylate or methacrylate in the presence of a stannous halide as a catalyst. The obtained monomer is used together with another copolymerizable monomer to produce a copolymer which is suitable for coating and photocurable composition.

Abstract: A lactone-modified hydroxyethyl (meth)acrylate solution comprising 30 to 95 parts by weight of a lactone-modified hydroxyethyl (meth)acrylate represented by the formula (I): ##STR1## wherein R is CH.sub.3 or H, and n is an integer of from 3 to 20, and 5 to 70 parts by weight of a solvent selected from the group consisting of toluene, xylene, an acetic acid ester and a mixture thereof is disclosed. The solution of the invention is homogeneous at room temperature.

Abstract: A process for manufacturing a colorless polyetheresteramide, which comprises the step of reacting (A) a polyamide-forming compound selected from aminocarboxylic acids and lactams each having at least 10 carbon atoms, (B) a dicarboxylic acid having from 4 to 20 carbon atoms and (D) a polyoxyalkylene glycol having an average molecular weight of from 300 to 6,000, in the molten state, in the presence of 0.0001 to 0.00999 percent by weight, based on the total weight of the above mentioned reactants, of a tetraalkyl titanate having a straight or branched alkyl having 1 to 24 carbon atoms, at a pressure of at the highest 5 mmHg at a temperature of 200.degree. to 300.degree. C.

Abstract: A process for preparing a graft polymer by subjecting a cyclic ester to ring-opening polymerization in the presence of a cellulose derivative in the presence of a ring-opening polymerization catalyst for the cyclic ester. The resulting graft polymer has high transparency, good film-formability and high solubility and can be suitably used as a novel polymer material.

Abstract: A radiation-curable resin composition is disclosed. It comprises 0.1 to 10 parts by weight of a photosensitizer added to 100 parts by weight of a mixture of 40 to 95 wt % of a resin having a molecular weight of at least 300 and at least one ethylenically unsaturated group in the molecule and 60 to 5 wt % of .epsilon.-caprolactone modified 2-hydroxyethyl acrylate or methacrylate of the formula: ##STR1## wherein R=H or CH.sub.3 andn is 1 to 10.The composition has a high boiling point, low viscosity and shows reduced skin irritation and rash capability without sacrificing its inherent radiation-curing capability.

Abstract: An epoxy resin having hydroxyl groups is modified with .epsilon.-caprolactone by effecting the ring opening polymerization of .epsilon.-caprolactone onto the hydroxyl groups contained in the epoxy resin. The modified epoxy resin is further combined with a polycarboxylic anhydride and a promotor for curing, or polyamine to give a curable composition. The modified epoxy resin is further modified by reacting the epoxy groups therein with a primary or secondary amine. Both the modified resin and the compositions are useful as coating.

Abstract: An epoxy resin having hydroxyl groups is modified with .epsilon.-caprolactone by effecting the ring opening polymerization of .epsilon.-caprolactone onto the hydroxyl groups contained in the epoxy resin. The modified epoxy resin is further combined with a polycarboxylic anhydride and a promotor for curing, or polyamine to give a curable composition. The modified epoxy resin is further modified by reacting the epoxy groups therein with a primary or secondary amine. Both the modified resin and the compositions are useful as coating.

Abstract: A lactone-modified epoxy (meth)acrylate resin is disclosed as is a hardenable resin composition which includes the lactone-modified epoxy resin. The lactone-modified epoxy (meth)acrylate resin is obtained by addition polymerizing 3 to 95 parts by weight of a lactone to 97 to 5 parts by weight of an epoxy (meth)acrylate resin at the whole or a part of the secondary hydroxy groups thereof. The hardenable resin composition comprises (A) 5 to 95 parts by weight of the above referred to lactone-modified epoxy (meth)acrylate resin, (B) 95 to 5 parts by weight of a vinyl compound having an ethylenically unsaturated bond, and (C) 0 to 10 parts by weight of a photosensitizer.

Abstract: A polyester compound has an average molecular weight of 700 to 3000 and is modified with epsilon-caprolactone. It is prepared from (a) epsilon-caprolactone or omega-hydroxycaproic acid, (b) an aliphatic diol component, (c) an aromatic or aliphatic polybasic carboxylic component and (d) an aromatic monocarboxyl to terminate each polymer chain.