US3751281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing a dimensionally stable waxed polyethylene sheet
Assignee: Chemplex Co
•
Filing: 1972-02-17
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Granted: 1973-08-07
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Expires: 1992-02-17
Abstract
Abstract This invention relates to a method for applying a wax coating to one or both sides of a polyethylene-based film which eliminates a hitherto troublesome problem of dimensional instability of the overwaxed film. More specifically, this invention provides a method for producing a waxed polyethylene film having a degree of dimensional stability heretofore not achieved.
Inventors
- 👤 J Peterson
- 👤 M Shida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:59
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/048; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; C08J2491/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
47 words
A method according to claim 1 wherein said contacting, metering, stretching and cooling steps are carried out at a speed between 200 and 500 feet per minute and said stretching is carried out to the extent of between 10 and 18 percent of the original film length.
Claim 2
Dependent Claim
25 words
A method according to claim 2 wherein the weight of said wax composition after said metering step is between 3 and 6 lbs. per ream.
Claim 3
Dependent Claim
19 words
A method according to claim 3 wherein said polyethylene film is between 0.001 in. and 0.0025 in. in thickness.
Claim 4
Dependent Claim
22 words
A method according to claim 4 wherein said polyethylene film has a surface which is treated to be receptive to fluid coatings.
Claim 5
Independent Claim
107 words
A method for obtaining a dimensionally stable wax-coated polyethylene web suitable for use in high-speed packaging operations which comprises applying a molten petroleum wax composition to at least one surface of a polyethylene web having a thickness of between 0.0005 in. and 0.005 in., maintaining said wax coating in a molten state and said polyethylene web at a temperature between about 130* F. and the softening temperature of the polyethylene while mechanically stretching said coated polyethylene web in a machine direction by an amount between about 5 percent and 20 percent, and subsequently chilling said coated and stretched web to complete solidification of said wax composition coating.
Claim 6
Dependent Claim
43 words
A method according to claim 6 wherein said wax composition is applied to a surface treated polyethylene web traveling at between about 200 and 500 feet per minute, said coated polyethylene web being stretched by an amount between 12 percent and 15 percent.
References Cited (Backward Citations)
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |