US4413109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Embossed films obtained from ethylene-propylene copolymers, and a process and apparatus for manufacturing the films
Assignee: Orkem SA
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Filing: 1981-03-20
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Granted: 1983-11-01
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Expires: 2001-03-20
Abstract
Abstract An embossed ethylene-propylene copolymer film having a thickness of less than or equal to 24 microns. A method and apparatus for making the film by blow-extruding the ethylene-propylene copolymer into a tubular web, pinching the tubular web between pinch rolls, and embossing the pinched web by passing it between an embossing roll and a pressure roll.
Inventors
- 👤 Armand Haas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:58
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C43/00; B29C43/22; B29C43/30; B29C43/305; B29C59/00; B29C59/005; B29C48/00; B29C48/001; B29C48/0019; B29C48/03; B29C48/09; B29C48/10; B29C59/02; B29C59/04; B29K; B29K2023/00; C08J2323/00; C08J2323/02; C08J2323/16; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
An embossed film comprising an ethylene-propylene copolymer, said embossed film having a thickness of less than or equal to 24 microns, and said ethylene-propylene copolymer having a density (ρ) between 0.900 and 0.935 g/cm 3 , a melt index between 0.4 and 2 dg/mn, a proportion (m) of methyl groups between 22 and 62 per 1000 carbon atoms, and wherein ρ and m are such that 0.9534≦ρ+0.83m≦0.9568.
Claim 2
Dependent Claim
67 words
An embossed film comprising an ethylene-propylene copolymer, said embossed film having a thickness of less than or equal to 24 microns, and said ethylene-propylene copolymer having a density (ρ) between 0.900 and 0.935 g/cm 3 , a melt index between 0.4 and 2 dg/mn, a proportion (m) of methyl groups between 22 and 62 per 1000 carbon atoms, and wherein ρ and m are such that 0.9534≦ρ+0.83m≦0.9568.
References Cited (Backward Citations)
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GB1087036A
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GB1355245A
Cited
US3857144A
Cited
US3950480A
Cited
US3911187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |