Patent US2386519A successfully refreshed from Google Patents.
US5028461A
Expired / Lapsed
US
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Injection molded container for food
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1989-10-02
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Granted: 1991-07-02
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Expires: 2009-10-02
Abstract
Abstract The present invention provides an injection molded food container which is produced by injection molding a polyarylene sulfide resin composition containing 20-70% by weight of glass fiber or glass fiber and other inorganic filler and is excellent in heat resistance, oil resistance and mechanical strength and is suitable as a food container used in microwave oven and convection oven having a heater. The injection molded food container can be manufactured by injection molding a polyarylene sulfide resin composition containing 20-70% by weight of glass fiber or glass fiber and other inorganic filler, using metal mold of which surface roughness is not greater than 5 μm, under condition of mold temperature 130°-180° C.
Inventors
- 👤 Masahiro Nakamichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:23
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/0005; A; A47; A47J; A47J36/00; A47J36/02; A47J36/027; A47J36/04; B29C45/0001; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/1352; Y10T428/1372
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
An injection molded food container having a body injection molded of a material selected from the group consisting of: (1) a mixture consisting essentially of 30-50% by weight of glass fiber and 70-50% by weight of polyarylene sulfide resin, and (2) a mixture consisting essentially of 15-50% by weight of glass fiber, 15-40% by weight of an inorganic filler other than glass fiber, and 25-60% by weight of polyarylene sulfide resin, said polyarylene sulfide resin having an initial melt viscosity of 300-30,000 poises and an initial melt index of 10-2,000 g/10min, and a heat cured melt index of 20-1,000 g/10min, said glass fiber has a diameter of 5-20 μm, a length of 0.1-20 mm and an aspect ratio of 10-10,000, and said body having a heat distortion temperature of at least 260° C. and an Izod notched impact strength of at least 3 kg. cm/cm.
Claim 2
Dependent Claim
145 words
An injection molded food container having a body injection molded of a material selected from the group consisting of: (1) a mixture consisting essentially of 30-50% by weight of glass fiber and 70-50% by weight of polyarylene sulfide resin, and (2) a mixture consisting essentially of 15-50% by weight of glass fiber, 15-40% by weight of an inorganic filler other than glass fiber, and 25-60% by weight of polyarylene sulfide resin, said polyarylene sulfide resin having an initial melt viscosity of 300-30,000 poises and an initial melt index of 10-2,000 g/10min, and a heat cured melt index of 20-1,000 g/10min, said glass fiber has a diameter of 5-20 μm, a length of 0.1-20 mm and an aspect ratio of 10-10,000, and said body having a heat distortion temperature of at least 260° C. and an Izod notched impact strength of at least 3 kg. cm/cm.
Claim 3
Dependent Claim
21 words
An injection molded food container according to claim 1, which has been heat treated at 150°-280° C. for 10 seconds-300 minutes.
Claim 4
Dependent Claim
25 words
An injection molded food container according to claim 1, wherein the glass fiber has a length of 1-20 mm and an aspect ratio of 15-3,000.
Claim 5
Dependent Claim
22 words
An injection molded food container according to claim 1, wherein the inorganic filler is calcium carbonate, talc, titanium white, or calcium sulfate.
Claim 6
Dependent Claim
22 words
An injection molded food container according to claim 1 which has a protective film on at least an inner wall surface thereof.
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) | 1994-07-01 | 1994-12-31 | 1995-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-01 | 1998-12-31 | 1999-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-01 | 2002-12-31 | 2003-07-02 | $7700.00 | Window Closed / Lapsed |