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US 11,965,051 B2Granted
Symmetrical polyolefin block copolymer and preparation method therefor
AssigneeAjou University Industry-Academic Cooperation Foundation
InventorsBun Yeoul Lee, Sung Dong Kim, Su Jin Gwon, Tae Hee Kim
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Abstract
The present invention relates to a method for preparing a polyolefin block copolymer, the method comprising: a first step of coordination polymerization of an olefin monomer with a transition metal catalyst in the presence of organozinc; and a second step of continuously adding a diacyl peroxide compound to perform polymerization, and to a polyolefin block copolymer prepared therefrom.
Claims6
A method of preparing a polyolefin block copolymer represented by Formula 1, the method comprising:
- the first step in which a compound represented by Formula A is prepared by coordination polymerization of an olefin monomer using a transition metal catalyst in the presence of an organozinc compound represented by Formula A-1;
- and
- the second step in which a compound represented by Formula B-1 is added to and reacted with the compound represented by Formula A
- (R1)2Zn [Formula A-1]
- R5C(O)O—OC(O)R5 [Formula B-1]
- wherein Formula A-1, Formula A, Formula B-1 and Formula 1, R1 and R5 are each independently a C1 to C20 hydrocarbyl group;
- R2 to R4 are each independently one selected from among hydrogen, a methyl group, an ethyl group, a butyl group, and a hexyl group;
- p and 1-p are mole fractions of sub-repeat units constituting a repeat unit b, respectively, p being greater than 0 and less than 1;
- a ranges from 50 to 5,000 on average or is 0;
- and b ranges from 50 to 5,000 on average.
7 more elements
Dependencies are inferred from the claim text.