Patent US4568608A successfully refreshed from Google Patents.
US4568608A
Expired / Lapsed
US
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Pre-foamed particles of polypropylene-base resin
Assignee: JSP Corp
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Filing: 1985-05-06
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Granted: 1986-02-04
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Expires: 2005-05-06
Abstract
Abstract In pre-foamed particles of a propylene-base resin obtained by foaming raw particles of the propylene-base resin, the relation, G1-G2>/=10%, exists between the content G1 (%) of matter, which is contained in the pre-foamed particles and is insoluble in boiling n-heptane, and the content G2 (%) of matter contained in the raw particles and insoluble in boiling n-heptane. The pre-foamed particles have excellent moldability and can hence provide with ease low-density (highly-expanded) molded articles, which enjoy superb dimensional accuracy, good surface conditions, low percent water absorption, excellent impact and chemical resistance.
Inventors
- 👤 Hideki Kuwabara
- 👤 Toru Yamaguchi
- 👤 Atushi Kitagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:46
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/228; C08J2323/00; C08J2323/02; C08J2323/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
65 words
Pre-foamed particles of a propylene-base resin obtained by foaming raw particles of the propylene-base resin, characterized in that the relation, G 1 -G 2 ≧10%, exists between the content G 1 (%) of matter, which is contained in the pre-foamed particles and is insoluble in boiling n-heptane, and the content G 2 (%) of matter contained in the raw particles and insoluble in boiling n-heptane.
Claim 2
Dependent Claim
65 words
Pre-foamed particles of a propylene-base resin obtained by foaming raw particles of the propylene-base resin, characterized in that the relation, G 1 -G 2 ≧10%, exists between the content G 1 (%) of matter, which is contained in the pre-foamed particles and is insoluble in boiling n-heptane, and the content G 2 (%) of matter contained in the raw particles and insoluble in boiling n-heptane.
Claim 3
Dependent Claim
29 words
Pre-foamed particles according to claim 1, wherein the content G 2 (%) of the matter contained in the raw particles and insoluble in boiling n-heptane is 40% or less.
Claim 4
Dependent Claim
15 words
Pre-foamed particles according to claim 1, wherein the polypropylene-base resin is a random propylene copolymer.
Claim 5
Dependent Claim
16 words
Pre-foamed particles according to claim 1, wherein the polypropylene-base resin contains a rubber or thermoplastic elastomer.
Claim 6
Dependent Claim
29 words
Pre-foamed particles according to claim 1, wherein the content G 1 (%) of the matter contained in the pre-foamed particles and insoluble in boiling n-heptane is 20% or more.
Claim 7
Dependent Claim
54 words
Pre-foamed particles according to claim 1, wherein the relation, G 1 -G 2 ≧15%, exists between the content G 1 (%) of matter, which is contained in the pre-foamed particles and is insoluble in boiling n-heptane, and the content G 2 (%) of matter contained in the raw particles and insoluble in boiling n-heptane.
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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |