Patent ID: 8003222

Claim:
A resin composition for use in forming an ultraviolet absorbing layer on the surface of a plastic substrate, having an ultraviolet absorbing polymer as a major component being synthesized from monomer mixtures containing an ultraviolet absorbing monomer, wherein the resin composition contains 0.5-5 parts by mass of a saturated polyester resin with a number-average molecular weight of 10,000 or higher and 0.1-30 parts by mass of a polyisocyanate based crosslinker relative to 100 parts by mass of the ultraviolet absorbing polymer, wherein the ultraviolet absorbing polymer has a weight-average molecular weight (Mw) in the range of 10,000 to 300,000, and the ultraviolet absorbing monomer is at least one monomer selected from the group consisting of a monomer represented by formula (2): wherein R 4 represents a hydrogen atom, a halogen atom, an alkyl group with a carbon number of 1-8, an alkoxy group with a carbon number of 1-4, a cyano group or a nitro group, R 5 represents a linear or branched alkylene group having an element with a carbon number of 1-12, —R 8 —O—, wherein R 8 represents a linear or branched alkylene group with a carbon number of 2 or 3, or a group having an element capable of forming a hydrogen bond, R 6 represents a hydrogen atom or a methyl group, and R 7 represents a hydrogen atom or a hydrocarbon group with a carbon number of 1-8; a monomer represented by formula (3): wherein R 9 represents a hydrogen atom or a hydroxyl group, R 10 represents a hydrogen atom or an alkoxy group with a carbon number of 1-6, R 11 represents —O—, OCH 2 CH 2 O—, —OCH 2 CH(OH)CH 2 O—, R 12 represents a hydrogen atom or a methyl group, and R 13 represents a hydrogen atom or a hydrocarbon group with a carbon number of 1-8; and a monomer represented by formula (4): wherein R 14 represents a direct bond, —(CH 2 CH 2 O)n—or —CH 2 CH(OH)—CH 2 O—, wherein n represents an integer of 1 to 5, R 15 represents a hydrogen atom or a methyl group, and R 16 through R 23 each independently represents a hydrogen atom, an alkoxy group, an alkenyl group or an alkyl group having a carbon number of 1 to 10.