US 12,460,102 B2
Paint-protective coating material and acrylic coating composition
Takeshi Igarashi, Ibaraki (JP); Eiichi Imoto, Ibaraki (JP); Chihiro Yoshida, Ibaraki (JP); and Koki Hashimoto, Ibaraki (JP)
Assigned to NITTO DENKO CORPORATION, Ibaraki (JP)
Filed by NITTO DENKO CORPORATION, Ibaraki (JP)
Filed on May 16, 2022, as Appl. No. 17/745,173.
Claims priority of application No. 2021-082914 (JP), filed on May 17, 2021; and application No. 2022-024082 (JP), filed on Feb. 18, 2022.
Prior Publication US 2022/0363940 A1, Nov. 17, 2022
Int. Cl. C09D 5/20 (2006.01); C09D 7/61 (2018.01); C09D 133/20 (2006.01)
CPC C09D 133/20 (2013.01) [C09D 5/20 (2013.01); C09D 7/61 (2018.01)] 9 Claims
 
1. A paint-protective coating material formed from an acrylic coating composition comprising an acrylic polymer as base polymer, wherein the acrylic polymer is formed from monomers comprising a monomer (mT) having a homopolymer glass transition temperature of 90° C. or higher and a monomer (mL) having a homopolymer glass transition temperature of −30° C. or lower, with the monomer (mT) comprising an acrylonitrile, in the monomers, the monomer (mT) and the monomer (mL) have a molar ratio (mT/mL) of 0.8 or higher and 1.5 or lower, a content of the acrylonitrile in the monomers is greater than 50 mol %, the base polymer accounts for 95% by weight or more of polymers in the acrylic coating composition, and the paint-protective coating material has a storage modulus at 23° C. of 150 MPa or higher and 1000 MPa or lower and a storage modulus at 70° C. of 0.40 MPa or higher.