Process for producing hydrogenated α-olefin-dicyclopentadiene copolymer, method for molding the same and optical material
AssigneeTeijin Limited
InventorsKiyonari Hashidzume, Kaoru Iwata
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Abstract
Process for producing a hydrogenated α-olefin-dicyclopentadiene copolymer. The process includes a step of distilling of unreacted dicyclopentadiene or tetrahydrodicyclopentadiene which is a hydrogenated product of unreacted dicyclopentadiene from a mixture containing α-olefin-dicyclopentadiene copolymer or its hydrogenated product in the presence of a high-boiling hydrocarbon solvent having a boiling point of 195 to 300° C. and an ignition point of 260° C. or more. Method for melt molding the hydrogenated α-olefin-dicyclopentadiene copolymer is also proposed.
Claims28
A process for producing a hydrogenated α-olefin-dicyclopentadiene copolymer comprising:
- (1) the step of addition-polymerization of an α-olefin having 2 or more carbon atoms and dicyclopentadiene in a hydrocarbon solvent in the presence of a polymerization catalyst, and then removing the polymerization catalyst as required, to produce an α-olefin-dicyclopentadiene copolymer solution containing unreacted dicyclopentadiene;
- (2) the step of adding a hydrogenation catalyst to the copolymer solution produced in the step (1) to hydrogenate the unsaturated double bonds of the α-olefin-dicyclopentadiene copolymer so as to produce a mixture containing a hydrogenated α-olefin-dicyclopentadiene copolymer;
- and
- (3) the step of distilling off tetrahydrodicyclopentadiene formed in the hydrogenation reaction of the step (2) from the mixture containing a hydrogenated α-olefin-dicyclopentadiene copolymer produced in the previous step,
- wherein at least one of the following operations (i), (ii) and (iii) is carried out to ensure that a high-boiling hydrocarbon solvent is existent in an amount of at least 10 parts by weight based on 100 parts by weight of the hydrogenated α-olefin-dicyclopentadiene copolymer at the end of the step (3):
- (i) use of a high-boiling hydrocarbon solvent as at least part of the hydrocarbon solvent of the step (1),
- (ii) addition of a high-boiling hydrocarbon solvent in the step (2), and
- (iii) addition of a high-boiling hydrocarbon solvent in the step (3);
- and the high-boiling hydrocarbon solvent contains at least a hydrocarbon solvent having a boiling point at normal pressure of 195 to 300° C. and an ignition point of 260° C. or more.
A process for producing a hydrogenated α-olefin-dicyclopentadiene copolymer comprising:
- (1′) the step of addition-polymerization of an α-olefin having 2 or more carbon atoms and dicyclopentadiene in a hydrocarbon solvent in the presence of a polymerization catalyst, and then removing the polymerization catalyst as required, to produce an α-olefin-dicyclopentadiene copolymer solution containing unreacted dicyclopentadiene;
- (2′) the step of distilling off the unreacted dicyclopentadiene from the α-olefin-dicyclopentadiene copolymer solution containing the unreacted dicyclopentadiene produced in the step (1′) to produce an α-olefin-dicyclopentadiene copolymer solution containing substantially no dicyclopentadiene;
- and
- (3′) the step of adding a hydrogenation catalyst to the α-olefin-dicyclopentadiene copolymer solution produced in the previous step to hydrogenate the unsaturated double bonds of the α-olefin-dicyclopentadiene copolymer to produce a mixture containing a hydrogenated α-olefin-dicyclopentadiene copolymer,
- wherein at least one of the following operations (i′) and (ii′) is carried out to ensure that a high-boiling hydrocarbon solvent is existent in an amount of at least 10 parts by weight based on 100 parts by weight of the α-olefin-dicyclopentadiene copolymer at the end of the above step (2′):
- (i′) use of a high-boiling hydrocarbon solvent as at least part of the hydrocarbon solvent of step (1′), and
- (ii′) addition of a high-boiling hydrocarbon solvent in step (2′);
- and the high-boiling hydrocarbon solvent contains at least a hydrocarbon solvent having a boiling point at normal pressure of 195 to 30° C. and an ignition point of 260° C. or more.
Dependencies are inferred from the claim text.