Patent US2909400A successfully refreshed from Google Patents.
Patent US3760036A successfully refreshed from Google Patents.
US3760036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pva lubricant for polyvinyl chloride
Assignee: Reynolds Metals Co
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Filing: 1972-04-12
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Granted: 1973-09-18
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Expires: 1992-04-12
Abstract
Abstract The heat seal characteristics of extruded oriented polyvinyl chloride film are improved by the addition of low molecular weight polyvinyl acetate homopolymers to a conventional extrusion mix and thereafter carrying out extrusion operations.
Inventors
- 👤 S Matthews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:04
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L31/00; C08L31/02; C08L31/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
25 words
The process of claim 1 wherein the low molecular weight polyvinyl acetate homopolymer has a softening point of from about 44* to about 86.5* C.
Claim 2
Dependent Claim
22 words
The process of claIm 2 wherein the low molecular weight polyvinyl acetate homopolymer has a softening point of from about 60*-70* C.
Claim 3
Dependent Claim
15 words
The process of claim 2 wherein the polyvinyl chloride film is subjected to stretching operations.
Claim 4
Dependent Claim
23 words
The process of claim 3 wherein the low molecular weight polyvinyl acetate homopolymer contains about 5 weight percent of finely divided polyvinyl chloride.
Claim 5
Dependent Claim
26 words
An extruded biaxially or uniaxially oriented polyvinyl chloride film containing from about 0.5 to about 2.0 weight percent of a low molecular weight polyvinyl acetate homopolymer.
Claim 6
Dependent Claim
25 words
The film of claim 6 wherein the low molecular weight polyvinyl acetate homopolymer has a softening point of from about 44* to about 86.5* C.
Claim 7
Dependent Claim
21 words
The film of claim 6 wherein the low molecular weight polyvinyl acetate homopolymer has a softening point of from about 60-70*C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |