US4822547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the extrusion of compositions comprising polypropylene, polyvinyl alcohol and a polypropylene-polyvinyl alcohol adhesive
Assignee: Union Carbide Chemicals and Plastics Technology LLC
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Filing: 1987-04-06
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Granted: 1989-04-18
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Expires: 2007-04-06
Abstract
Abstract This invention relates to a process for extruding scrap material comprising polyvinyl alcohol, polypropylene-polyvinyl alcohol adhesive and polypropylene prepared with a high activity polymerization catalyst, the improvement comprising utilizing in the polypropylene from about 50 to about 5000 ppm of hydrotalcite.
Inventors
- 👤 Wayne E. Derrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:55
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/06; B; B29; B29B; B29B17/00; B29B9/00; B29B9/02; B29B9/06; C08K; C08K3/00; C08K3/18; C08K3/24; C08K3/26; B29C; B29C48/00; B29C48/03; B29C48/09; B29K; B29K2023/00; B29K2023/10; B29K2023/12; B29K2029/00; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
49 words
In the process of extruding a composition comprising polyvinyl alcohol, a polypropylene-polyvinyl alcohol adhesive and a polypropylene prepared with a high activity polymerization catalyst, the improvement which comprises utilizing polypropylene having from about 50 to about 5000 ppm by weight of hydrotalcite incorporated therein to substantially eliminate gel formation.
Claim 2
Dependent Claim
49 words
In the process of extruding a composition comprising polyvinyl alcohol, a polypropylene-polyvinyl alcohol adhesive and a polypropylene prepared with a high activity polymerization catalyst, the improvement which comprises utilizing polypropylene having from about 50 to about 5000 ppm by weight of hydrotalcite incorporated therein to substantially eliminate gel formation.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the amount of hydrotalcite ranges from about 250 to about 3000 ppm.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein the amount of hydrotalcite ranges from about 500 to about 2000 ppm.
Claim 5
Dependent Claim
33 words
The process of claims 1, 2 or 3 wherein the polypropylene additionally incorporates from about 50 to about 5000 ppm by weight of an alkali metal or an alkaline metal earth metal stearate.
Claim 6
Dependent Claim
31 words
The process of claims 1, 2 or 3 wherein the polypropylene incorporates from about 250 to about 3000 ppm by weight of an alkali metal or an alkaline earth metal stearate.
Claim 7
Dependent Claim
31 words
The process of claims 1, 2 or 3 wherein the polypropylene incorporates from about 500 to about 3000 ppm by weight of an alkali metal or an alkaline earth metal stearate.
Claim 8
Dependent Claim
14 words
The process of claims 1, 2 or 3 wherein the hydrotalcite has been calcined.
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) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |