Patent ID: 7186788
Filing Date: 2007-03-06
Classification: C09D

Abstract:
1. A wear-resistant coating film comprising (A) (meth)acrylic copolymer resin, wherein the glass transition temperature (Tg1) thereof as determined by a rigid pendulum viscoelastometer and the glass transition temperature (Tg2) thereof as determined by a differential scanning calorimeter (DSC) are in the range of 110° C. to 250° C. respectively, and the wear resistance thereof as determined by a Taber abrasion testing method is 80 times or more, wherein the difference between the glass transition temperature (Tg1) as determined by a rigid pendulum viscoelastometer and the glass transition temperature (Tg3) thereof calculated from a monomer composition constituting the coating film is 30° C. or more and wherein the difference between the glass transition temperature (Tg2) as determined by a differential scanning calorimeter (DSC) and the glass transition temperature (Tg3) thereof calculated from a monomer composition constituting the coating film is 30° C. or more, and wherein the (meth)acrylic copolymer resin (A) has a weight-average molecular weight (Mw) of 20,000 to 82,000, and is produced by radical polymerizing (a-1) 4 to 50 wt % of (meth)acrylic acid, (a-2) 0.5 to 17 wt % of (meth)acrylic acid amide, and (b) 35 to 95.5 wt % of compound having a reactive unsaturated bond other than (a-1) and (a-2), and the (meth)acrylic copolymer resin (A) is dissolved in an organic solvent (B).