US4596833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polypropylene foamed particles
Assignee: Mitsubishi Chemical BASF Co Ltd
•
Filing: 1985-10-22
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Granted: 1986-06-24
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Expires: 2005-10-22
Abstract
Abstract Substantially non-crosslinked polypropylene foamed particles having a bulk density of from 8 to 100 g/l and a particle diameter of from 1 to 5 mm and containing an organic sodium phosphate represented by the formula: <IMAGE> +TR <IMAGE>
Inventors
- 👤 Hiroshi Endo
- 👤 Toshio Yagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:10
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0038; C08K; C08K5/00; C08K5/0091; C08K5/49; C08K5/51; C08K5/52; C08K5/521; C08K5/523; C08J2323/00; C08J2323/02; C08J2323/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
41 words
Substantially non-crosslinked polypropylene foamed particles having a bulk density of from 8 to 100 g/l and a particle diameter of from 1 to 5 mm, said foamed particles containing an organic sodium phosphate represented by the formula (I) or (II): ##STR3##
Claim 2
Dependent Claim
41 words
Substantially non-crosslinked polypropylene foamed particles having a bulk density of from 8 to 100 g/l and a particle diameter of from 1 to 5 mm, said foamed particles containing an organic sodium phosphate represented by the formula (I) or (II): ##STR3##
Claim 3
Dependent Claim
29 words
Polypropylene foamed particles as in claim 1, wherein said organic sodium phosphate is present in an amount of from 0.02 to 1% by weight based on the polypropylene resin.
Claim 4
Dependent Claim
59 words
Polypropylene foamed particles as in claim 1, wherein said polypropylene is composed of from 5 to 30% by weight of a room-temperature xylene-soluble matter having an ethylene content of from 20 to 80% by weight and from 70 to 95% by weight of a room-temperature xylene-insoluble matter having a main melting peak temperature of from 130° to 158° C.
References Cited (Backward Citations)
US2989782A
Cited
US3236681A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |