Alkylidenenorbornene polymer and process for producing the same
AssigneeNippon Zeon Co., Ltd.
InventorsTeiji Kohara, Shin-ichiro Tahara, Yoshitsugu Hirokawa, Tadao Natsuume
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Abstract
The present invention discloses an alkylidenenorbornene polymer comprising as the essential constituent at least one kind of the structural unit represented by the formula ##STR1## wherein R.sub.1 denotes an alkyl group of 1-4 carbon atoms and R.sub.2 denotes a hydrogen atom or an alkyl group of 1-5 carbon atoms, and a process for producing the same. According to the present invention, an alkylidenenorbornene polymer is obtained which is excellent in light resistance, transparency, heat resistance and moisture resistance and is useful as an optical polymeric material.
Claims27
An alkylidenenorbornene polymer, having an intrinsic viscosity of 0.2 to 10 dl/g measured at 50.degree. C. in decahydronaphthalene a principal chain comprising at least 50% by weight of a structural unit represented by the formula (I):
- ##STR8## wherein R.sub.1 denotes an alkyl group and R.sub.2 denotes a hydrogen atom or an alkyl group.
An alkylidenenorbornene polymer, having an intrinsic viscosity of 0.2 to 10 dl/g measured at 50.degree. C. in decahydronaphthalene, which comprises a principal chain comprising at least 50% by weight of a first structural unit represented by the following formula I:
- ##STR9## wherein R.sub.1 denotes an alkyl group and R.sub.2 denotes a hydrogen atom or an alkyl group, and, in addition to said first structural unit, as a second structural unit in said principal chain, a different cationically polymerized monomer.
A process for producing an alkylidenenorbornene polymer having an intrinsic viscosity of 0.2 to 10 dl/g measured at 50.degree. C. in decahydronaphthalene comprising a principal chain comprising at least 50% by weight of a structural unit represented by the formula (I):
- ##STR10## wherein R.sub.1 denotes an alkyl group and R.sub.2 denotes a hydrogen atom or an alkyl group, which comprises:
- polymerizing an alkylidenenorbornene represented by the formula (II):
- ##STR11## wherein R.sub.1 and R.sub.2 are the same meanings as defined above, or a mixture thereof with a comonomer cationically copolymerizable therewith, in the presence of a catalyst comprising a Lewis acid and an initiator compound of the formula (III):
- ##STR12## wherein R.sub.3 denotes an aliphatic or aromatic hydrocarbon group, R.sub.4 and R.sub.5 each independently denote a lower aliphatic hydrocarbon group or an aromatic hydrocarbon group, X denotes a hydroxyl group, an alkoxyl group, an acyloxy group or a halogen.
A process for producing an alkylidenenorbornene polymer having an intrinsic viscosity of 0.2 to 10 dl/g measured at 50.degree. C. in decahydronaphthalene comprising a principal chain comprising at least 50% by weight of a structural unit represented by the formula (I):
- ##STR13## wherein R.sub.1 denotes an alkyl group and R.sub.2 denotes a hydrogen atom or an alkyl group, which comprises:
- polymerizing an alkylidenenorbornene represented by the formula II:
- ##STR14## wherein R.sub.1 and R.sub.2 are the same meanings as defined above, or a mixture thereof with a comonomer cationically copolymerizable therewith, in the presence of a catalyst comprising a Lewis acid and as an initiator at least one compound selected from the group consisting of 2,5-dimethyl-dihydroxyhexane, 2,5-dimethyl-2,5-diacetoxyhexane, 2,5-dimethyl-2,5-dichlorohexyne, 2,4,4,6-tetramethyl-2,6-dihydroxy heptane, 1,3-bis(2-acetoxy-2-propyl)benzene, 1,4-bis(2-methoxy-2-propyl)benzene, and 1,3,4-tris (2-bromo-2-propyl)benzene.
A process as claimed in 21 wherein the electron donor is at least one compound represented by the formula (IV) ##STR15## wherein R.sub.6, R.sub.7 and R.sub.8 each independently denote a hydrogen atom, an aliphatic hydrocarbon group or an aromatic group, or R.sub.6, R.sub.7 and R.sub.8 may form a ring structure;and W denotes N, NO, P, PO or PS.
Dependencies are inferred from the claim text.