Patent US5756614A successfully refreshed from Google Patents.
US5756614A
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Polypropylene and other olefin polymer thermoplastic elastomers, novel catalyst for preparing the same and method of preparation
Assignee: Academy of Applied Science Inc
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Filing: 1995-02-03
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Granted: 1998-05-26
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Expires: 2015-02-03
Abstract
Abstract A thermoplastic elastomeric polypropylene (and other olefin homopolymerized polymers) using a novel catalyst with a single monomer olefin, and method of preparing the same to produce a chain of alternating stereo regular crystallizable segments and stereo-irregular non-crystallizable polymerized segments, the former acting as physical crosslinks between the non-crystallizable segments to form a thermoplastic elastomeric material having good elastomeric properties.
Inventors
- 👤 James C. W. Chien
- 👤 Marvin D. Rausch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:56
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/04; C08F110/06; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/6592; C08F4/65922; C08F4/65927; C08F4/65912; Y; Y10; Y10S; Y10S526/00; Y10S526/943
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A thermoplastic elastomeric propylene polymer chain having only alternate blocks of a homopolymerized single propylene monomer that contains alternating stereo-regular crystallizable isotactic polymerized blocks and stereo-irregular non-crystallizable polymerized blocks and with uniformity of structure, the former providing physical crosslinks between the non-crystallizable blocks which impart elastomeric properties with a range of recovery from 93 to 97% after 100% elongation strain, and with of the order of twenty monomer units in each of the attenuating blocks, providing x-ray measured crystallinity with a range of 26.5 to 28.6%.
Claim 2
Dependent Claim
86 words
A thermoplastic elastomeric propylene polymer chain having only alternate blocks of a homopolymerized single propylene monomer that contains alternating stereo-regular crystallizable isotactic polymerized blocks and stereo-irregular non-crystallizable polymerized blocks and with uniformity of structure, the former providing physical crosslinks between the non-crystallizable blocks which impart elastomeric properties with a range of recovery from 93 to 97% after 100% elongation strain, and with of the order of twenty monomer units in each of the attenuating blocks, providing x-ray measured crystallinity with a range of 26.5 to 28.6%.
Claim 3
Independent Claim
54 words
A method of forming a thermoplastic elastomeric propylene polymer, that comprises, in the presence of MAO, homopolymerizing a single monomer only of propylene with a non-symmetrical catalyst of the formula rac-ethylidene) 1-η 5 -tetra methylcyclopentadienyl) (1-η 5 -indenyl) dichloro-M, where M is a metal selected from the group consisting of Ti, Zr and Hf.
Claim 4
Independent Claim
54 words
A method of forming a thermoplastic elastomeric propylene polymer, that comprises, in the presence of MAO, homopolymerizing a single monomer only of propylene with a non-symmetrical catalyst of the formula rac-ethylidene) 1-η 5 -tetra methylcyclopentadienyl) (1-η 5 -indenyl) dichloro-M, where M is a metal selected from the group consisting of Ti, Zr and Hf.
Claim 5
Dependent Claim
53 words
A method as claimed in claim 2 wherein the propylene is polymerized, with one propagation path of the non-symmetric catalyst creating of the order of twenty monomer units in stereo-selective crystallized blocks in the resulting chain and the other propagation path creating of the order of twenty monomer units in irregular non-crystallizable blocks.
Claim 6
Dependent Claim
34 words
A method as claimed in claim 2 wherein the propylene is polymerized with one path of the catalyst creating stereo-selective blocks in the resulting chain and the other propagation path creating irregular non-crystallizable blocks.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-25 | 2001-11-24 | 2002-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-25 | 2005-11-24 | 2006-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-25 | 2009-11-24 | 2010-05-26 | $7700.00 | Window Closed / Lapsed |