Patent ID: 6018010
Filing Date: 2000-01-25
Classification: C08F

Abstract:
A polymer comprising structural units derived from an .alpha.,.beta.-unsaturated carboxylic acid monomer and structural units derived from another vinyl monomer,said polymer having(1) an acid value of 50 mgKOH/g or higher,(2) when analyzed with a differential scanning calorimeter, a differential DSC curve having at least one peak top in each of the range of from -80 to 20.degree. C. and the range of from 20 to 120.degree. C., and(3) a parallel-ray transmittance of 80% or higher,wherein said .alpha.,.beta.-unsaturated carboxylic acid monomer is at least one selected from the group consisting of acrylic acid and methacrylic acid, and said structural units derived from said .alpha.,.beta.-unsaturated carboxylic acid monomer are contained in an amount at least 7% by weight based on the amount of said polymer, andwherein at least 30% by weight of said structural units derived from said another vinyl monomer is at least one selected from the group consisting of an alkyl acrylate and an alkyl methacrylate.