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AssigneeSK Kaken Co., Ltd.
InventorsHidehito Karuga, Shigeto Kamimura, Hiroshi Nakai, Hisashi Suzuki, Tadahiko Ikeuchi, Kenichi Ishigaki, Kensuke Kurimoto, Takanori Nakashoya
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The present invention relates to a coating composition, which forms an anti-contamination coat having hydrophilicity on the surface, soil-release effect and excellent stain resistance to oil, and which is also suitable for outside wall coating of buildings, having excellent interlaminar adhesion when multiple coating is performed. A conventional anti-contamination coating was insufficient in stainproofing performance immediately after formation of the coat, and there was no coating which is superior in stain resistance to oil and interlaminar adhesion. The coating composition of the present invention is obtained by mixing a tetraalkoxysilane condensate which has an average condensation degree of 4 to 20 and has an alkyl group having 1 to 2 carbon atoms and an alkyl group having 3 to 10 carbon atoms, or an alkyl group having 1 to 3 carbon atoms and an alkyl group having 4 to 12 carbon atoms, the alkyl group having 3 to 10 carbon atoms or 4 to 12 carbon atoms being contained in the amount of 5 to 50% by equivalent based on all alkyl groups in the condensate, with a polyurethane resin, an acrylic copolymer resin or a silicone-acrylic copolymer resin in the amount of 1.0 to 40.0 parts by weight in term of SiO2 relative to 100 parts by weight of the polyol compound. The addition of a hydrophilic alkoxysilane having a poly alkylene oxide chain compound is also suitable.
An anti-contamination coating composition comprising a polyurethane-forming component (PU-I) obtained by mixing a polyol compound (A1) having a weight-average molecular weight of 5000 to 80000 a Tg of from 100 to 150° C. and a hydroxyl group value of 20 to 150 (KOH mg/g) with a polyisocyanate compound (B1) in a NCO/OH equivalent ratio of 0.6 to 1.4;
An anti-contamination coating composition comprising a polyurethane-forming component (PU-II) containing a polyol compound (A2) having a solubility parameter of 6.5 to 9.5, a weight-average molecular weight of 5000 to 150000 and a hydroxyl group value of 15 to 100 (KOH mg/g) dissolved and/or dispersed in a non-aqueous solvent and a polyisocyanate compound (B2) in a NCO/OH equivalent ratio of 0.7 to 2.0;
An anti-contamination coating composition comprising a polyurethane-forming component (PU-II) containing a polyol compound (A2) having a solubility parameter of 6.5 to 9.5, a weight-average molecular weight of 5000 to 150000 a Tg of from 100 to 150° C. and a hydroxyl group value of 15 to 100 (KOH mg/g) dissolved and/or dispersed in a non-aqueous solvent and a polyisocyanate compound (B2) in a NCO/OH equivalent ratio of 0.7 to 2.0, a tetraalkoxysilane condensate (C2) which is a condensate of tetraalkoxysilane having an average condensation degree of 4 to 20 and which has an alkyl group having 1 to 3 carbon atoms and an alkyl group having 4 to 12 carbon atoms, the alkyl group having 4 to 12 carbon atoms being contained in the amount of 5 to 50% by equivalent based on all alkyl groups in the condensate, and an amine compound (E), wherein the tetraalkoxysilane condensate (C2) is contained in the amount of 1.0 to 50.0 parts by weight in term of SiO2 and the amine compound (E) is contained in the solid content of 0.02 to 5.0 parts by weight, respectively, relative to 100 parts by weight of the resin solid content of the polyol compound (A2).
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