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US 4,020,251 AGranted
1,3-Cyclodiene-acyclic conjugated diene copolymers
AssigneePhillips Petroleum Company
InventorHenry L. Hsieh
Life of this patent
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Abstract
A copolymer is produced by polymerization of a mixture comprising a 1,3-cyclodiene and an acyclic conjugated diene wherein a substantial percentage by weight of the acyclic conjugated diene units of the copolymer is in the trans and vinyl configurations. A method for producing the copolymer is provided employing an organolithium initiator. A hydrogenated copolymer and method of its production is also provided.
Claims21
A method for the production of a copolymer by polymerizing a monomer mixture consisting essentially of
- 1,3-butadiene;
- a 1,3-cyclodiene represented by the general formulas ##STR4## wherein R is selected from the group consisting of hydrogen, methyl and ethyl radicals, R' is selected from the group consisting of hydrogen, cycloalkyl, aryl and linear and branced alkyl radicals such that the maximum number of carbon atoms per R' radical is about 6 and the total number of carbon atoms per cyclodiene monomer is in the range of from about 5 to 20;
- an organolithium initiator consisting of alpha-lithio multisubstituted dialkylbenzenes and dialkylbenzene oligomers represented by the general formula ##STR5## wherein R"' is a linear or branched alkyl containing 2 to 12 carbon atoms, and n is an integer from 0 to 2;
- optionally a vinylaromatic compound containing in the range of from about 8 to 14 carbon atoms per molecule;
- optionally an ether or tertiary amine in an amount in the range of from about 0.01 to 50 parts by weight per 100 parts by weight monomer;
- and
- optionally a hydrocarbon diluent which is not detrimental to said polymerization.
4 more elements
A copolymer consisting essentially of
- units of 1,3-butadiene;
- units of a 1,3-cyclodiene represented by the general formulas ##STR6## wherein R is selected from the group consisting of hydrogen, methyl and ethyl radicals, R' is selected from the group consisting of hydrogen, cycloalkyl, aryl and linear and branched alkyl radicals such that the maximum number of carbon atoms per R' radical is about 6 and the total number of carbon atoms per cyclodiene monomer is in the range of from about 5 to 20;
- optionally units of a vinylaromatic compound containing in the range of from about 8 to 14 carbon atoms per molecule;
- and
- wherein the 1,3-butadiene portion of said copolymer has a trans and vinyl content ranging from about 48 to 99 percent when said copolymer does not contain units of said vinylaromatic compound and 39 to 99 percent when said copolymer does contain units of said vinylaromatic compound.
2 more elements
Dependencies are inferred from the claim text.