Patent ID: 7101498
Filing Date: 2006-09-05
Classification: C08G,C09K,G02B

Abstract:
1. An optical film comprising a thermoplastic norbornene-based resin formed of a copolymer comprising a structural unit a represented by a general formula (1) shown below, and a structural unit b represented by a general formula (2) shown below: wherein, n represents either 0 or 1, and m represents either 0, or an integer of 1 or greater; X represents a group represented by a formula —CH═CH— or a group represented by a formula —CH 2 CH 2 —, R 1 , R 2 , R 3 , and R 4 each represent, independently, a hydrogen atom; a halogen atom; a substituted or unsubstituted hydrocarbon group of 1 to 30 carbon atoms which may contain a linkage group incorporating an oxygen atom, a nitrogen atom, a sulfur atom or a silicon atom; or a polar group; or alternatively R 1 and R 2 , or R 3 and R 4 , or R 2 and R 3 may be mutually bonded together forming a hydrocarbon ring or a heterocyclic ring wherein said hydrocarbon ring or said heterocyclic ring may be aromatic or non-aromatic, and may be either a single ring structure, or form a polycyclic structure through condensation with another ring, and at least one of said groups R 1 to R 4 is, independently, a group represented by a general formula (1-1) shown below or a group represented by a general formula (1-2) shown below; and wherein a plurality of each of said groups X, R 1 , R 2 , R 3 and R 4 within said copolymer may be identical or different, wherein, R 5 to R 14 each represent, independently, a hydrogen atom; a halogen atom; a substituted or unsubstituted monovalent hydrocarbon group of 1 to 30 carbon atoms which may contain a linkage group incorporating an oxygen atom, a nitrogen atom, a sulfur atom or a silicon atom; or a monovalent polar group, and one of said groups R 5 to R 14 is a group represented by a formula —C(O)O— in which a carbonyl group side is bonded to a carbon atom of a ring structure shown in said formula (1-1); p and q each represent, independently, an integer of 0 to 2, and in a case in which p=q=0, R 6 and R 9 , or R 13 and R 9 , or R 5 and R 14 , or R 12 and R 14 may be mutually bonded together forming a hydrocarbon ring or a heterocyclic ring wherein said hydrocarbon ring or said heterocyclic ring may be either a single ring structure, or form a polycyclic structure through condensation with another ring; and a plurality of each of said groups R 5 to R 14 within said copolymer may be identical or different, wherein, Z, R A and R B each represent, independently, a hydrogen atom; a halogen atom; a substituted or unsubstituted monovalent hydrocarbon group of 1 to 30 carbon atoms which may contain a linkage group incorporating an oxygen atom, a nitrogen atom, a sulfur atom or a silicon atom; or a monovalent polar group, and one of said groups R A , R B and Z is a group represented by a formula —C(O)O— in which a carbonyl group side is bonded to a carbon atom of a ring structure shown in said formula (1-2); s represents 0 or an integer of 1 or greater; and a plurality of each of said groups Z, R A and R B within said copolymer may be identical or different, wherein, t represents 0 or 1, u represents 0 or an integer of 1 or greater; and X, R 1 , R 2 , R 3 and R 4 each have an identical meaning as defined in relation to said general formula (1), although cases in which said groups R 1 to R 4 a group represented by said general formula (1-1) or a group represented by said general formula (1-2) are excluded.