Patent US4013622A successfully refreshed from Google Patents.
US4013622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing breakdown in polyethylene film
Assignee: Cities Service Co
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Filing: 1975-06-23
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Granted: 1977-03-22
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Expires: 1995-06-23
Abstract
Abstract The addition of 200-500 ppm of polyethylene glycol (mw 1,300-7,500) to polyethylene film reduces the incidence of breakdown at typical operating conditions.
Inventors
- 👤 James V. DeJuneas
- 👤 Gordon L. McIntyre
- 👤 James F. O'Horo, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:17
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/10; C08L71/00; C08L71/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
79 words
A composition, to reduce breakdown in polyethylene blown film, comprising a. a majority amount of low-density polyethylene of about 99 wt.%, depending on the levels of anti-block, slip, and anti-oxidant additives, based on the weight of the finished composition, and b. a minor amount of polyethylene glycol, varying from about 100 to about 600 ppm, based on the weight of the finished composition, and wherein the molecular weight of the polyethylene glycol varies from about 600 to about 20,000.
Claim 2
Dependent Claim
79 words
A composition, to reduce breakdown in polyethylene blown film, comprising a. a majority amount of low-density polyethylene of about 99 wt.%, depending on the levels of anti-block, slip, and anti-oxidant additives, based on the weight of the finished composition, and b. a minor amount of polyethylene glycol, varying from about 100 to about 600 ppm, based on the weight of the finished composition, and wherein the molecular weight of the polyethylene glycol varies from about 600 to about 20,000.
Claim 3
Dependent Claim
48 words
The composition of claim 1, in which a. the density of polyethylene varies between about 0.915 and about 0.929, b. the amount of polyethylene glycol varies from about 200 to about 500 ppm, and c. the molecular weight of polyethylene glycol varies from about 1300 to about 7500.
Claim 4
Independent Claim
70 words
A method for reducing breakdown in low-density polyethylene, used in blown film applications, which comprises a. incorporating a minor amount of polyethylene glycol in the low-density polyethylene prior to extrusion, in which the added amount of polyethylene glycol varies from about 100 to about 600 ppm, based on the weight of the total composition, and the molecular weight of the added polyethylene glycol varies from about 600 to about 20,000.
Claim 5
Independent Claim
70 words
A method for reducing breakdown in low-density polyethylene, used in blown film applications, which comprises a. incorporating a minor amount of polyethylene glycol in the low-density polyethylene prior to extrusion, in which the added amount of polyethylene glycol varies from about 100 to about 600 ppm, based on the weight of the total composition, and the molecular weight of the added polyethylene glycol varies from about 600 to about 20,000.
Claim 6
Dependent Claim
30 words
The method of claim 3 wherein the amount of polyethylene glycol varies from about 200 to about 500 ppm, and the molecular weight varies from about 1,300 to about 7,500.
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) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |