US4713419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic olefin elastomer
Assignee: Toyoda Gosei Co Ltd
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Filing: 1986-04-30
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Granted: 1987-12-15
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Expires: 2006-04-30
Abstract
Abstract There is provided a thermoplastic olefin elastomer of polyblend composed of 30 to 70 wt % of ethylene-propylene-diene terpolymer (EPDM), 10 to 30 wt % of ethylene-vinyl acetate copolymer (EVA), and 20 to 50 wt % of polypropylene (PP). The EPDM is specified by the Mooney viscosity, propylene content, and third component. The EVA is specified by the VA content and number-average molecular weight. The PP is specified by the number-average molecular weight. This elastomer is suitable for use as a raw material for automotive exterior trim such as side molding, bumper, and mud guard which are produced by injection molding. The elastomer also affords molded items having a good matte-finished appearance. The polyblend obviates the process for partial crosslinking which was necessary for the preparation of conventional elastomer for injection molding.
Inventors
- 👤 Masahiro Takimoto
- 👤 Junji Takeuchi
- 👤 Yoshio Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:28
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/14; C08L23/142; C08L23/16; C08L2205/00; C08L2205/03; C08L2207/00; C08L2207/04; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L23/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A thermoplastic olefin elastomer of polyblend which comprises 30 to 70 wt% of ethylene-propylene-diene terpolymer (EPDM), 10 to 30 wt% of ethylene-vinyl acetate copolymer (EVA), and 20 to 50 wt% of polypropylene (PP), said EPDM having a Mooney viscosity ML 1+4 (100° C.) of 60 to 100 and containing 20 to 40 wt% of propylene and ethylidenenorbornene as a third component, said EVA containing 10 to 30 wt% of vinyl acetate and having an Mn of 13,500 to 17,000, and said PP having an Mn of 30,000 to 110,000.
Claim 2
Dependent Claim
89 words
A thermoplastic olefin elastomer of polyblend which comprises 30 to 70 wt% of ethylene-propylene-diene terpolymer (EPDM), 10 to 30 wt% of ethylene-vinyl acetate copolymer (EVA), and 20 to 50 wt% of polypropylene (PP), said EPDM having a Mooney viscosity ML 1+4 (100° C.) of 60 to 100 and containing 20 to 40 wt% of propylene and ethylidenenorbornene as a third component, said EVA containing 10 to 30 wt% of vinyl acetate and having an Mn of 13,500 to 17,000, and said PP having an Mn of 30,000 to 110,000.
Claim 3
Dependent Claim
27 words
A thermoplastic olefin elastomer of polyblend as set forth in claim 1, wherein the PP is a block copolymer containing not greater than 10 wt% of polyethylene.
Claim 4
Dependent Claim
101 words
An injection molded product having a substantially uniform matte-finished surface consisting essentially of a thermoplastic olefin elastomer, said elastomer, comprising 30 to 70 wt% of ethylene-propylene-diene terpolymer (EPDM), 10 to 30 wt% of ethylene-vinyl acetate copolymer (EVA), and 20 to 50 wt% of polypropylene (PP), said EPDM having a Mooney viscosity ML 1+4 (100° C.) of 60 to 100 and containing 20 to 40 wt% of propylene and ethylidenenorbornene as a third component, said EVA containing 10 to 30 wt% of vinyl acetate and having an Mn of 13,500 to 17,000, and said PP having an Mn of 30,000 to 110,000.
Claim 5
Dependent Claim
101 words
An injection molded product having a substantially uniform matte-finished surface consisting essentially of a thermoplastic olefin elastomer, said elastomer, comprising 30 to 70 wt% of ethylene-propylene-diene terpolymer (EPDM), 10 to 30 wt% of ethylene-vinyl acetate copolymer (EVA), and 20 to 50 wt% of polypropylene (PP), said EPDM having a Mooney viscosity ML 1+4 (100° C.) of 60 to 100 and containing 20 to 40 wt% of propylene and ethylidenenorbornene as a third component, said EVA containing 10 to 30 wt% of vinyl acetate and having an Mn of 13,500 to 17,000, and said PP having an Mn of 30,000 to 110,000.
Claim 6
Dependent Claim
21 words
The injection molded product according to claim 3, wherein said product is a bumper part, and mud guard or side molding.
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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) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |