Paint-protective coating material and acrylic coating composition
AssigneeNitto Denko Corporation
InventorsTakeshi Igarashi, Eiichi Imoto, Chihiro Yoshida, Koki Hashimoto
Life of this patent
Estimating the term…
Abstract
Provided is a paint-protective coating material formed from an acrylic coating composition comprising an acrylic polymer as base polymer. The acrylic polymer-forming monomers includes a monomer (mT) having a homopolymer Tg of 90° C. or higher and a monomer (mL) having a homopolymer Tg of −30° C. or lower. The monomer (mT) includes at least acrylonitrile. In the monomers, the monomers (mT) and (mL) have a molar ratio (mT/mL) of 0.8 or higher and 1.5 or lower. The paint-protective coating material has storage moduli of 150 MPa or higher and 1000 MPa or lower at 23° C., and 0.40 MPa or higher at 70° C.
Claims9
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.
An acrylic coating composition for forming a paint-protective coating material, wherein the acrylic coating composition comprises an acrylic polymer as base polymer, 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 acrylic coating composition forms a paint-protective coating material having 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.
Dependencies are inferred from the claim text.