Patent US4363771A successfully refreshed from Google Patents.
US4363771A
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US
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Process for preparing non-oriented polyolefin film
Assignee: Mobil Oil AS
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Filing: 1981-06-24
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Granted: 1982-12-14
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Expires: 2001-06-24
Abstract
Abstract A method for producing non-oriented film that comprises depositing high molecular weight polyolefin powder on a smooth non-adherent substrate, sintering the deposited powder, contacting the sintered powder with rollers at the sintering temperature at a pressure sufficient to effect densification of the polyolefin normal to the surface but insufficient to effect significant longitudinal flow of the polyolefin to form a void-free film, and stripping said film from said substrate.
Inventors
- 👤 James G. Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:47
CPC Classifications
C; C08; C08J; C08J5/00; B; B29; B29D; B29D7/00; B29D7/01; C08J2323/00; C08J2323/02; C08J2323/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
95 words
A method for producing a non-oriented film that comprises depositing high molecular weight polyolefin powder on a smooth non-adherent substrate, sintering said deposited powder at a sintering temperature just below the melting temperature of the polyolefin, rolling in a longitudinal direction the sintered powder held at the sintering temperature with at least one unheated roller at a pressure sufficient to effect densification of the polyolefin normal to its surface but insufficient to effect significant longitudinal flow of the polyolefin to form a non-oriented void free film, and quenching and stripping said film from said substrate.
Claim 2
Independent Claim
95 words
A method for producing a non-oriented film that comprises depositing high molecular weight polyolefin powder on a smooth non-adherent substrate, sintering said deposited powder at a sintering temperature just below the melting temperature of the polyolefin, rolling in a longitudinal direction the sintered powder held at the sintering temperature with at least one unheated roller at a pressure sufficient to effect densification of the polyolefin normal to its surface but insufficient to effect significant longitudinal flow of the polyolefin to form a non-oriented void free film, and quenching and stripping said film from said substrate.
Claim 3
Dependent Claim
12 words
The method of claim 1, wherein said polyolefin is high density polyethylene.
References Cited (Backward Citations)
US3400186A
Cited
US3975481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |