Star-block interpolymers and preparation of the same
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United States of America Patent
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Oct 8, 2002
Grant Date -
Aug 29, 2002
app pub date -
Oct 18, 2001
filing date -
Oct 19, 2000
priority date (Note) -
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Abstract
The present invention relates to star-block interpolymers having the following structure (X-Y).sub.n -C, wherein X represents a random copolymer block derived from conjugated diene and monovinyl aromatic monomer; Y represents a polyconjugated diene block; C represents a residue derived from a multifunctional lithium based initiator; and n represents the functionality of the initiator and has a value of not less than 3; and preparation of the same. The star-block interpolymers according to the present invention have in the same molecule both a random copolymer block derived from conjugated diene and monovinyl aromatic monomer and a rubber block selected from the group consisting of a homopolymer block derived from conjugated diene, a tapered copolymer block derived from conjugated dienes, a random copolymer block derived from conjugated dienes and combinations thereof, and hence possess excellent properties of the both kinds of rubbers, and can be used widely as elastomeric materials.
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