Patent US4639495A successfully refreshed from Google Patents.
US4639495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruding process for preparing functionalized polyolefin polymers
Assignee: EIDP Inc
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Filing: 1983-04-14
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Granted: 1987-01-27
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Expires: 2003-04-14
Abstract
Abstract An extruder process for grafting ethylenically unsaturated monomers onto polyolefin polymers through the use of peroxide initiators without evidencing degradation of the base polymer whereby the components are concurrently melted and homogeneously mixed in an intensive mixing zone of an extruder, passed into a reduced pressure zone to remove excess monomer and passed through the remainder of the extruder process.
Inventors
- 👤 Marion G. Waggoner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:46
CPC Classifications
C; C08; C08F; C08F255/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
A process for the preparation of functionalized polyolefin polymers comprising: (i) concurrently heating to 200°-350° C. and homogeneously mixing a blend of a polyolefin having 2 to 8 carbon atoms, said polyolefin being at a temperature below its melting point prior to said heating, 0.1 to 10 weight percent of an α,β ethylenically unsaturated monomer and 0.05 to 2.0 weight percent of an organic peroxide initiator in an intensive mixing zone of an extruder for a time sufficient to graft the monomer onto the polyolefin such that 0.1 to 3.0 weight percent of the grafted polyolefin consists of the monomers; (ii) passing the mixture into a reduced pressure zone as compared to the intensive mixing zone and removing any excess monomer therefrom; and (iii) passing the mixture through the remainder of the extruder.
Claim 2
Dependent Claim
133 words
A process for the preparation of functionalized polyolefin polymers comprising: (i) concurrently heating to 200°-350° C. and homogeneously mixing a blend of a polyolefin having 2 to 8 carbon atoms, said polyolefin being at a temperature below its melting point prior to said heating, 0.1 to 10 weight percent of an α,β ethylenically unsaturated monomer and 0.05 to 2.0 weight percent of an organic peroxide initiator in an intensive mixing zone of an extruder for a time sufficient to graft the monomer onto the polyolefin such that 0.1 to 3.0 weight percent of the grafted polyolefin consists of the monomers; (ii) passing the mixture into a reduced pressure zone as compared to the intensive mixing zone and removing any excess monomer therefrom; and (iii) passing the mixture through the remainder of the extruder.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein step (i) is carried out in between 5 and 30 seconds.
Claim 4
Dependent Claim
44 words
The process of claim 1 wherein the extruder is a twin screw extruder and the intensive mixing zone is comprised of conventional conveying elements, at least one kneading element and at least one element with reverse pitch as compared to the normal conveying elements.
Claim 5
Dependent Claim
45 words
The process of claim 1 wherein the monomer is an unsaturated mono- or polycarboxylic-containing acids (C 3 -C 10 ) with at least one olefinic unsaturation, and anhydride, salt, ester, ether, amide, nitrile, thiol, thio acid, glycidyl, cyano, hydroxy and glycol derivatives of said acids.
References Cited (Backward Citations)
US3261885A
Cited
US3177269A
Cited
US3256362A
Cited
US3267173A
Cited
GB1042178A
Cited
US3270090A
Cited
US3553176A
Cited
US3862265A
Cited
US3830888A
Cited
US3953655A
Cited
US3862266A
Cited
US3949019A
Cited
US4105709A
Cited
US4174358A
Cited
US4174358B1
Cited
US4134927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |