US3944530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Article made of propylene-ethylene copolymer
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1974-09-17
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Granted: 1976-03-16
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Expires: 1994-09-17
Abstract
Abstract Articles such as containers made of a crystalline olefin polymer having improved transparency and impact strength obtained by biaxially extending an extruded tubular body of said polymer at an orientation temperature below the melting point to attain an extension magnification ratio of at least 1.5 for each of longitudinal and lateral directions wherein said polymer is a statistical random copolymer of propylene and from 0.3% to 5.0% by weight ethylene having a melt index of 0.6 - 3.0 g/10 min. Optionally, from 0.03 to 0.20 part by weight of aluminum p-tert-butyl benzoate or sodium p-tert-butyl benzoate are added to 100 parts by weight of said copolymer.
Inventors
- 👤 Yasunori Sugita
- 👤 Yasuhiko Itagaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:47
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/04; C08F210/06; B; B29; B29C; B29C49/00; B29C49/0005; B29C49/08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
128 words
An article having improved transparency and impact strength which is obtained by cooling and solidifying an extruded tubular body of a highly crystalline olefin polymer and thereafter extending it biaxially at an orientation temperature below the melting point to attain an extension magnification ratio of at least 1.5 for each of longitudinal and lateral directions, wherein said polymer is a statistical random copolymer of propylene with ethylene having a melt index of 0.6 - 3.0 g/10 min. and an ethylene content of from 0.3% to 5.0% by weight and contains a crystalline nucleating agent selected from the group consisting of aluminum p-tert-butyl benzoate and sodium p-tert-butyl benzoate in an amount of from 0.03 to 0.20 part by weight per 100 parts by weight of said statistical random copolymer.
Claim 2
Dependent Claim
128 words
An article having improved transparency and impact strength which is obtained by cooling and solidifying an extruded tubular body of a highly crystalline olefin polymer and thereafter extending it biaxially at an orientation temperature below the melting point to attain an extension magnification ratio of at least 1.5 for each of longitudinal and lateral directions, wherein said polymer is a statistical random copolymer of propylene with ethylene having a melt index of 0.6 - 3.0 g/10 min. and an ethylene content of from 0.3% to 5.0% by weight and contains a crystalline nucleating agent selected from the group consisting of aluminum p-tert-butyl benzoate and sodium p-tert-butyl benzoate in an amount of from 0.03 to 0.20 part by weight per 100 parts by weight of said statistical random copolymer.
Claim 3
Dependent Claim
12 words
The article according to claim 1 wherein said article is a container.
Claim 4
Dependent Claim
22 words
The article according to claim 1 wherein said statistical random copolymer has an ethylene content of from 1.5% to 5.0% by weight.
References Cited (Backward Citations)
US2956991A
Cited
US3244778A
Cited
US3294885A
Cited
US3541189A
Cited
US3449263A
Cited
US3736307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |