Patent US5202570A successfully refreshed from Google Patents.
US4048409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Article made of propylene-ethylene copolymer
Assignee: Mitsui Toatsu Chemicals Inc
•
Filing: 1976-03-12
•
Granted: 1977-09-13
•
Expires: 1996-03-12
Abstract
Abstract Articles such as containers made of a highly crystalline olefin polymer having improved transparency and impact strength are obtained by biaxially extending an extruded tubular body of said polymer at an orientation temperature below the melting point thereof to attain an extension magnification ratio of at least 1.5 for each of the longitudinal and lateral directions. The polymer is a statistical random copolymer of propylene and from 1.5% to 5.0%, and preferably from 3.0% 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 p-tert. butyl benzoic acid, benzoic acid or sodium 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
2026-10-29 07:04
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/08; B29C49/0005; C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098; Y; Y10; Y10S; Y10S526/00; Y10S526/901; Y10S526/916
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
An article having improved transparency, impact strength and moldability which is obtained by cooling and solidifying an extruded tubular body of a highly crystalline olefin polymer and thereafter extending it biaxially by orientation blow molding 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 which has a melt index of from 0.6 to 3.0 g/10 min. and an ethylene content of from 1.5% to 5.0% by weight.
Claim 2
Dependent Claim
95 words
An article having improved transparency, impact strength and moldability which is obtained by cooling and solidifying an extruded tubular body of a highly crystalline olefin polymer and thereafter extending it biaxially by orientation blow molding 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 which has a melt index of from 0.6 to 3.0 g/10 min. and an ethylene content of from 1.5% to 5.0% by weight.
Claim 3
Dependent Claim
20 words
The article according to claim 1 wherein said polymer has an ethylene content of from 3.0% to 5.0% by weight.
Claim 4
Dependent Claim
12 words
The article according to claim 1 wherein said article is a container.
Claim 5
Dependent Claim
41 words
The article according to claim 1 wherein a crystallization nucleating agent selected from the group consisting of benzoic acid, sodium benzoate and p-tert. butyl benzoic acid is added in an amount of from 0.03% to 0.20% by weight of said polymer.
Claim 6
Dependent Claim
20 words
The article according to claim 4 wherein said polymer has an ethylene content of from 3.0% to 5.0% by weight.
Claim 7
Dependent Claim
12 words
The article according to claim 5 wherein said article is a container.
References Cited (Backward Citations)
US3294885A
Cited
US3736307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |