US4587270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preliminarily foamed particles of non-crosslinked polypropylene-type resin
Assignee: JAPAN STYRENE PAPER Corp A CORP OF JAPAN
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Filing: 1984-11-21
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Granted: 1986-05-06
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Expires: 2004-11-21
Abstract
Abstract Preliminarily foamed particles of a non-crosslinked polypropylene resin based on an alpha-olefin/propylene random copolymer having an amount of the heat of crystallization in the range of 5 to 15 cal/g, said preliminarily foamed particles having such a crystal structure that when a DSC curve is drawn by means of a differential scanning calorimeter, by heating 1 to 3 mg of the preliminarily foamed particles to 220° C. at a rate of 10° C./min., a high temperature peak is observed at a higher temperature than the temperature of the peak inherent to the base resin.
Inventors
- 👤 Hideki Kuwabara
- 👤 Yoshimi Sudo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:55
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/228; C08J2323/00; C08J2323/02; C08J2323/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
Preliminarily foamed particles of a non-crosslinked polypropylene resin based on an alpha-olefin having 4 to 6 carbon atoms/propylene random copolymer having an amount of the heat of crystallization in the range of 5 to 15 cal/g, said preliminarily foamed particles having such a crystal structure that when a DSC curve is drawn by heating 1 to 3 mg of the preliminarily foamed particles to 220° C. at a rate of 10° C./min. by means of a differential scanning calorimeter, a high temperature peak is observed at a higher temperature than the temperature of the peak inherent to the base resin.
Claim 2
Dependent Claim
100 words
Preliminarily foamed particles of a non-crosslinked polypropylene resin based on an alpha-olefin having 4 to 6 carbon atoms/propylene random copolymer having an amount of the heat of crystallization in the range of 5 to 15 cal/g, said preliminarily foamed particles having such a crystal structure that when a DSC curve is drawn by heating 1 to 3 mg of the preliminarily foamed particles to 220° C. at a rate of 10° C./min. by means of a differential scanning calorimeter, a high temperature peak is observed at a higher temperature than the temperature of the peak inherent to the base resin.
Claim 3
Dependent Claim
34 words
The preliminarily foamed particles of claim 1 wherein the difference between the temperature of the inherent peak of the base resin and the temperature of the high temperature peak is at least 5° C.
Claim 4
Dependent Claim
15 words
The preliminarily foamed particles of claim 1 wherein the alpha-olefin is 1-butene, 1-pentene, or 1-hexene.
Claim 5
Dependent Claim
33 words
The preliminarily foamed particles of claim 1 wherein the alpha-olefin/propylene random copolymer is a 1-butene/propylene random copolymer in which the proportion of 1-butene in the copolymer is from about 15 to 40 mole%.
Claim 6
Dependent Claim
18 words
An in-mold article obtained by foaming the preliminarily foamed particles of claim 1 in a mold under heat.
References Cited (Backward Citations)
US4399087A
Cited
US4379859A
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US4415680A
Cited
US4436840A
Cited
US4448901A
Cited
US4504601A
Cited
US4464484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |