Thermoplastic elastomeric block copolymers and process for the preparation thereof
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United States of America Patent
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Oct 31, 2000
Grant Date -
N/A
app pub date -
Jun 16, 1998
filing date -
Aug 4, 1995
priority date (Note) -
Expired
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Abstract
This invention relates to a thermoplastic elastomeric block copolymer and process for the preparation thereof. According to this invention, the block copolymer obtained through block copolymerization process at higher temperature and adding butyllithium in twice during copolymerization are mixed block copolymer of A.sub.1 -B-A.sub.2 /B-A.sub.2 and B-A.sub.2 /B-A.sub.2 (where A represents monovinyl aromatic monomer; B represents conjugated diene monomer) having different blocks, higher elongation and appropriate melt index. The process of this invention is simple and efficient. The thermoplastic elastomeric block copolymer of this invention are particularly useful for various applications of typical styrene butadiene block copolymer, especially plastic modifier.
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