Basf Coatings Japan Limited

Basf Coatings Gmbh

Rui Nimi

Tetsu Konishi

Takehito Ito

Masayuki Takemoto

Shinji Mitsumune

Hiroyuki Tagkagi

Machiko Okada

Disclosed herein is a paint composition comprising a carboxyl group containing resin comprising two or more carboxyl groups per molecule, having an acid number of from 100 to 300 mgKOH/g and a weight average molecular weight of from 2,000 to 30,000, obtained by the copolymerization of a carboxyl group containing radically polymerizable monomer and another radically polymerizable monomer, wherein the carboxyl group containing resin comprises 5 to 50 weight percent of structural units based on a lactone compound, based on resin solids; an epoxy group containing resin, comprising two or more epoxy groups per molecule; an ultraviolet absorber; and a light stabilizer having a pKb value of at least 9; wherein the molar ratio of the carboxyl groups of the carboxyl group containing resin to the epoxy groups of the epoxy group containing resin is 3:1 to 1:3.

Paint compositions, method of paint finishing and painted objects

Disclosed herein is a clear paint composition, comprising (A) an acrylic copolymer comprising from 35 to 50 wt % &#x3b5;-caprolactone structural units, based on the resin solid fraction, and wherein the hydroxyl number is from 200 to 340 mgKOH/g and the weight average molecular weight is from 5,000 to 15,000 and (B) a non-yellowing type polyisocyanate compound, wherein the isocyanate group of the (B) component is included in a proportion of from 0.5 to 2 equivalents per 1 equivalent of hydroxyl group of the (A) component, wherein the Young's modulus of the hardened paint film obtained from said paint composition is not more than 1.5 Pa, wherein the molecular weight of intercrosslinking of the cured coating film (Mc) is not more than 350 g/mol, and wherein the glass transition temperature (Tg) of the hardened paint film is at least 65&#xb0; C.

Paint composition and painted objects

Disclosed herein is a heat-hardenable paint composition comprising a base resin, wherein the base resin comprises (A) a lactone modified resin comprising hydroxyl groups, wherein 20 to 70 weight percent of the structural units are based on the lactone compound, and the hydroxyl group value is from 50 to 400 mgKOH/g, and (B) an acrylic resin comprising hydroxyl groups and cyclic structures, wherein 10 to 80 weight percent of structural units are based on a radically polymerizable monomer comprising a cyclic structure, the hydroxyl group value is from 50 to 150 mgKOH/g, and the crosslinking resin is an isocyanate compound, wherein the weight ratio of the solid fractions of (A):(B) in the base resin is from 95:5 to 20:80.

Thermosetting paint compositions

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Munster, Germany

Rui Nimi