US4594390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of thermoplastic elastomers
Assignee: Advanced Elastomer Systems LP
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Filing: 1982-08-23
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Granted: 1986-06-10
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Expires: 2002-08-23
Abstract
Abstract A process is described for the preparation of thermoplastic elastomers comprising a blend of plastic and cured rubber by dynamic vulcanization wherein the blend is subjected to high shear.
Inventors
- 👤 Sabet Abdou-Sabet
- 👤 Kuo-Shein Shen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:00
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/26; C08L23/02; C08L23/10; B; B29; B29B; B29B13/00; B29C; B29C35/00; B29C35/02; B29C48/00; B29C48/25; B29C48/78; B29C48/80; B29C48/83; B29C48/832; C08L23/04; C08L23/16; B29C48/03; B29C48/04
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
49 words
In a process for preparing thermoplastic elastomer composition comprising a blend of plastic and cured rubber by dynamic vulcanization, the improvement comprising masticating during dynamic vulcanization a composition comprising a blend of polypropylene and ethylene-propylene diene monomer rubber at a shear rate of at least 2000 sec -1 .
Claim 2
Dependent Claim
49 words
In a process for preparing thermoplastic elastomer composition comprising a blend of plastic and cured rubber by dynamic vulcanization, the improvement comprising masticating during dynamic vulcanization a composition comprising a blend of polypropylene and ethylene-propylene diene monomer rubber at a shear rate of at least 2000 sec -1 .
Claim 3
Dependent Claim
19 words
The process of claim 1 in which the melt viscosity of the composition is 10 to 200 pascal seconds.
Claim 4
Dependent Claim
18 words
The process of claim 2 in which the shear rate is about 2500 to 7500 sec -1 .
Claim 5
Dependent Claim
28 words
The process of claim 3 in which the composition comprises 50 weight percent or less of polypropylene and has a melt viscosity of 10 to 100 pascal seconds.
Claim 6
Dependent Claim
27 words
The process of claim 4 in which the composition comprises a blend of 60-85 parts by weight of rubber and correspondingly, 40-15 parts by weight of polypropylene.
Claim 7
Dependent Claim
14 words
The process of claim 5 in which vulcanization is essentially complete in 20-60 seconds.
Claim 8
Dependent Claim
30 words
The process of claim 6 in which the rubber is cured to the extent that no more than 5 weight percent of the rubber is soluble in a rubber solvent.
Claim 9
Dependent Claim
20 words
The process of claim 7 in which the rubber curative is a phenolic curative comprising phenolic resin and cure activator.
Claim 10
Dependent Claim
29 words
The process of claim 8 in which the blend is masticated by the use of a twin-shaft screw extruder in which two intermeshing screws rotate in the same direction.
Claim 11
Dependent Claim
27 words
The process of claim 9 in which the composition comprises a blend of 70-80 parts by weight of rubber and, correspondingly, 30-20 parts by weight of polypropylene.
Claim 12
Dependent Claim
19 words
The process of claim 10 in which the composition contains 1-1.5 parts of extender oil per part of rubber.
Claim 13
Dependent Claim
9 words
A product prepared by the process of claim 1.
Claim 14
Dependent Claim
12 words
The product of claim 12 prepared by the process of claim 7.
Claim 15
Dependent Claim
12 words
The product of claim 13 prepared by the process of claim 8.
Claim 16
Dependent Claim
12 words
The product of claim 14 prepared by the process of claim 9.
Claim 17
Dependent Claim
27 words
The product of claim 15 in which the composition comprises a blend of 70-80 parts by weight of rubber and, correspondingly, 30-20 parts by weight of polypropylene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |