Patent US4761431A successfully refreshed from Google Patents.
US4761431A
Expired / Lapsed
US
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Pre-expanded particles of propylene resin
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1987-10-20
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Granted: 1988-08-02
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Expires: 2007-10-20
Abstract
Abstract A pre-expanded particle of a propylene resin having two melting temperatures as determined by DSC, the heat of fusion for the peak based on the higher melting temperature being 0.5 to 2.3 cal/g. By using the pre-expanded particles of the propylene resin of the invention, foamed articles having excellent surface appearance, small dimentional shrinkage can be easily obtained without the procedure for giving the internal pressure.
Inventors
- 👤 Kyoichi Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:06
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/228; C08J9/16; C08J9/18; C08J2323/00; C08J2323/02; C08J2323/10; C08L; C08L23/00; C08L23/02; C08L23/10; Y; Y10; Y10S; Y10S264/00; Y10S264/09; Y10S264/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A pre-expanded particle of a propylene resin having two melting temperatures as determined by differential scanning calorimetry, the heat of fusion Q H for the peak based on the higher melting temperature being 0.5 to 2.3 cal/g.
Claim 2
Dependent Claim
37 words
A pre-expanded particle of a propylene resin having two melting temperatures as determined by differential scanning calorimetry, the heat of fusion Q H for the peak based on the higher melting temperature being 0.5 to 2.3 cal/g.
References Cited (Backward Citations)
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US4436840A
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US4448901A
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US4464484A
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US4602047A
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US4695593A
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US4720509A
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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) | 1991-08-02 | 1992-02-01 | 1992-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-02 | 1996-02-01 | 1996-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-02 | 2000-02-01 | 2000-08-02 | $7700.00 | Window Closed / Lapsed |