US4945127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer composition, its heat-resistant, shape memory formed product and method of producing same
Assignee: Tonen Chemical Corp
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Filing: 1988-12-23
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Granted: 1990-07-31
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Expires: 2008-12-23
Abstract
Abstract A heat-resistant formed product produced from a polymer composition comprising 40-70 weight % of a thermoplastic elastomer containing a repeating unit derived from ethylene and a repeating unit derived from propylene and 60-30 weight % of an ethylene-vinyl acetate copolymer containing 7.5 weight % or more of a vinyl acetate repeating unit, by blending the polymer composition at a temperature of 160° C. or less, molding it at a temperature of 180° C. or less, and then cross-linking the resulting molded product by irradiating electron beam or heating. The formed product also has good shape memory characteristics.
Inventors
- 👤 Seiji Kagawa
- 👤 Hideaki Toda
- 👤 Shinichiro Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:55
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/16; C08L2201/00; C08L2201/12; C08L2205/00; C08L2205/03; C08L23/08; C08L23/0846; C08L23/0853; C08L23/0869
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
A shape memory formed product made of a polymer composition comprising 40-70 weight % of a thermoplastic elastomer containing a repeating unit derived from ethylene and a repeating unit derived from propylene, and 60-30 weight % of an ethylene-vinyl acetate copolymer containing 7.5 weight % or more of a vinyl acetate repeating unit, wherein said polymer composition is prepared by blending at a temperature of 160° C. or less, then molded at a temperature of 180° C. or less to produce a formed product, then which is deformed at such a temperature that crystal phases wherein are melted and then cooled while being kept in a deformed shape so as to obtain a shape memory formed product.
Claim 2
Dependent Claim
117 words
A shape memory formed product made of a polymer composition comprising 40-70 weight % of a thermoplastic elastomer containing a repeating unit derived from ethylene and a repeating unit derived from propylene, and 60-30 weight % of an ethylene-vinyl acetate copolymer containing 7.5 weight % or more of a vinyl acetate repeating unit, wherein said polymer composition is prepared by blending at a temperature of 160° C. or less, then molded at a temperature of 180° C. or less to produce a formed product, then which is deformed at such a temperature that crystal phases wherein are melted and then cooled while being kept in a deformed shape so as to obtain a shape memory formed product.
Claim 3
Dependent Claim
17 words
The shape memory formed product according to claim 1, wherein said thermoplastic elastomer is an ethylene-propylene-diene copolymer.
Claim 4
Dependent Claim
26 words
The shape memory formed product according to claim 2, wherein said ethylene-propylene-diene copolymer is 50-70 weight %, and said ethylene-vinyl acetate copolymer is 50-30 weight %.
Claim 5
Dependent Claim
31 words
The shape memory formed product according to claim 1, further comprising 5-35 parts by weight of a filler per 100 parts by weight of said thermoplastic elastomer+said ethylene-vinyl acetate copolymer+said filler.
Claim 6
Dependent Claim
33 words
The shape memory formed produce according to claim 1, further comprising 20-70 parts by weight of a thermoplastic resin per 100 parts by weight of said thermoplastic elastomer+said ethylene-vinyl acetate copolymer+said thermoplastic resin.
Claim 7
Dependent Claim
26 words
The shape memory formed product according to claim 1, further comprising a foaming agent such that it is foamed when heated in the step of molding.
Claim 8
Dependent Claim
26 words
The shape memory formed product according to claim 1, wherein after the molding step the resulting molded product is cross-linked by electron beam irradiation or heating.
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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) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |