Patent US1684145A successfully refreshed from Google Patents.
Patent US4170304A successfully refreshed from Google Patents.
US4170304A
Expired / Lapsed
US
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Wrapping film
Assignee: British Cellophane Ltd
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Filing: 1978-05-19
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Granted: 1979-10-09
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Expires: 1998-05-19
Abstract
Abstract A wrapping film for use in spin wrapping applications is produced by extruding a blend of polyethylene with between 0.5 and 10% by weight of polyisobutylene to form a film and treating one surface of the film with a corona discharge.
Inventors
- 👤 Peter N. Huke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:44
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; B; B29; B29C; B29C48/00; B29C48/001; B29C48/0018; B29C48/0019; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29K; B29K2995/00; B29K2995/0037; B29K2995/0072; C08L23/18; C08L23/20; C08L23/22; C08L2555/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A method of manufacture of a wrapping film suitable for use in spin wrapping applications comprising extruding a blend of polyethylene with between 0.5 and 10% by weight of a tackifying agent polyisobutylene to form a film and treating one surface of the film with a corona discharge to increase the adhesive characteristics thereof, the level of treatment of the film by corona discharge is not less than the level of treatment required to bring the wetting tension of plain polyethylene film to at least 34 dynes per centimeter.
Claim 2
Independent Claim
89 words
A method of manufacture of a wrapping film suitable for use in spin wrapping applications comprising extruding a blend of polyethylene with between 0.5 and 10% by weight of a tackifying agent polyisobutylene to form a film and treating one surface of the film with a corona discharge to increase the adhesive characteristics thereof, the level of treatment of the film by corona discharge is not less than the level of treatment required to bring the wetting tension of plain polyethylene film to at least 34 dynes per centimeter.
Claim 3
Dependent Claim
24 words
A method according to claim 1 in which the polyisobutylene content in the blend lies in the range between 2 and 5% by weight.
Claim 4
Dependent Claim
24 words
A method according to claim 1 in which the polyisobutylene content in the blend lies in the range between 3 and 4.5% by weight.
Claim 5
Dependent Claim
17 words
A wrapping film when manufactured by a method according to claim 1, claim 2 or claim 3.
Claim 6
Dependent Claim
13 words
A pallet of goods when wrapped with wrapping film according to claim 4.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |