Abstract: A condensation polymerization of apolyhydric alcohol and a polybasic acid in a solvent is performed to give a polyester resin. The polyester resin and an unsaturated polybasic acid are polymerized to give a polyester resin intermediate of following formula (1) having a carbon-carbon double bond at one end. The polyester resin intermediate is polymerized with an acryl monomer to give an acryl-modified polyester resin composition. Due to the polymerization of the polyester resin intermediate having the carbon-carbon double bond and the acryl monomer, a paint including the acryl-modified polyester resin composition has advantages of a polyester resin and the acryl resin, R—CH2—O—CO—CH?CH—X??(1) wherein R represents a polyester polymer residue, and X represents a methyl or carboxylic group.

Abstract: A water soluble thermosetting polyester resin composition for undercoating a PCM steel sheet is prepared from about 100 parts by weight of thermosetting polyester resin obtained by condensing polyethylene terephthalate using glycol and polybasic acid, about 5-20 parts by weight of anhydrous polybasic acid and amine. A paint composition prepared using thus prepared resin composition is applicable for undercoating PCM steel sheet for both of home appliances and construction materials. In addition, an organic solvent included in the conventional oily paint composition can be excluded to minimize an environmental contamination, a dangerous factor of initiating fire and a bodily harm on human. Further, a paint composition having advantageous processibility, chemical resistance, solvent resistance, adhesion and scratch resistance may be prepared.

Abstract: In a uniformly copolymerized one-part polyurethane resin composition with improved processing behaviors and chemical resistance, the one-part polyurethane resin composition comprises about 20 to 50% by weight of a hard segment and about 50 to 80% by weight of a soft segment. The hard segment reduces drying time and recoating time of a film coated by the composition, and the soft segment improves processing behaviors of the film including rolling and spraying properties. The one-part polyurethane resin composition may further comprise a catalyst. The catalyst may regulate film drying time and improve gloss of a coated film. Thus, the resin composition may be applied in various fields.

Abstract: In a uniformly copolymerized one-part polyurethane resin composition with improved processing behaviors and chemical resistance, the one-part polyurethane resin composition comprises about 20 to 50% by weight of a hard segment and about 50 to 80% by weight of a soft segment. The hard segment reduces drying time and recoating time of a film coated by the composition, and the soft segment improves processing behaviors of the film including rolling and spraying properties. The one-part polyurethane resin composition may further comprise a catalyst. The catalyst may regulate film drying time and improve gloss of a coated film. Thus, the resin composition may be applied in various fields.

Abstract: A water soluble thermosetting polyester resin composition for undercoating a PCM steel sheet is prepared from about 100 parts by weight of thermosetting polyester resin obtained by condensing polyethylene terephthalate using glycol and polybasic acid, about 5-20 parts by weight of anhydrous polybasic acid and amine. A paint composition prepared using thus prepared resin composition is applicable for undercoating PCM steel sheet for both of home appliances and construction materials. In addition, an organic solvent included in the conventional oily paint composition can be excluded to minimize an environmental contamination, a dangerous factor of initiating fire and a bodily harm on human. Further, a paint composition having advantageous processibility, chemical resistance, solvent resistance, adhesion and scratch resistance may be prepared.

Abstract: A urethane-modified polyester resin composition used for undercoating a PCM steel sheet for home appliances or construction materials is produced by an addition reaction of a polyester resin having a hydroxyl value of about 10 to 50 mgKOH/g and a weight average molecular weight of about 5,000 to 20,000 and isocyanate. The isocyanate is reacted with the polyester resin in a proportion of 20 to 80% with respect to an equivalent weight of the polyester resin. A paint including the urethane-modified polyester resin composition has improved adhesion between the undercoat film and a substrate or topcoat film and has enhanced processibility.

Abstract: In a uniformly copolymerized one-part polyurethane resin composition with improved processing behaviors and chemical resistance, the one-part polyurethane resin composition comprises about 20 to 50% by weight of a hard segment and about 50 to 80% by weight of a soft segment. The hard segment reduces drying time and recoating time of a film coated by the composition, and the soft segment improves processing behaviors of the film including rolling and spraying properties. The one-part polyurethane resin composition may further comprise a catalyst. The catalyst may regulate film drying time and improve gloss of a coated film. Thus, the resin composition may be applied in various fields.

Abstract: A condensation polymerization of apolyhydric alcohol and a polybasic acid in a solvent is performed to give a polyester resin. The polyester resin and an unsaturated polybasic acid are polymerized to give a polyester resin intermediate of following formula (1) having a carbon-carbon double bond at one end. The polyester resin intermediate is polymerized with an acryl monomer to give an acryl-modified polyester resin composition.