Olefin block copolymer and production process thereof
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Nov 23, 1999
Issued Date -
N/A
app pub date -
May 28, 1997
filing date -
Sep 22, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A chemically bonded olefin block copolymer consists essentially of chemically bonded polypropylene and poly(ethylene-co-propylene). The block copolymer is obtained by a process of (1) introducing a Ziegler polymerization catalyst based on titanium and propylene to a first polymerization zone (a) and polymerizing the propylene in the polymerization zone (a) for a period of 0.01 to 0.130 seconds and withdrawing an effluent stream of polypropylene, catalyst, solvent and unreacted propylene therefrom; (2) introducing the effluent stream to a second polymerization zone (b) together with ethylene dissolved in a solvent and carrying out a polymerization reaction in the second polymerization zone (b) for a period of 0.01 to 0.130 seconds; and (3) recovering the block copolymer.
First Claim
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Family

- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
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RESEARCH DEVELOPMENT CORPORATION OF JAPAN | 2-5-2 NAGATO-CHO CHIYODA-KU TOKYO |
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
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Terano, Minoru | Ishikawa-ken, JP | 21 | 578 |
# of filed Patents : 21 Total Citations : 578 |
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Patent Citation Ranking
- 5 Citation Count
- C08F Class
- 5.18 % this patent is cited more than
- 26 Age
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Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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