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US4190624A
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Process for the extrusion of compositions based on alpha-olefin polymers
Assignee: Solvay SA
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Filing: 1978-06-05
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Granted: 1980-02-26
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Expires: 1998-06-05
Abstract
Abstract Process for the extrusion, followed by cooling with water, of compositions based on alpha-olefin polymers. The composition being extruded comprises a phenolic anti-oxidizing agent, an organic phosphite, and a carbonate of an alkaline-earth metal. The process permits fabricating films, filaments and tubes.
Inventors
- 👤 Joseph Alard
- 👤 Jean-Louis Derroitte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:53
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/24; C08K3/26; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/524
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
69 words
Process for the extrusion of a composition based on an alpha-olefin polymer, followed by a cooling with water of the extruded material, comprising: extruding an alpha-olefin composition which comprises stabilizing amounts of (a) at least one phenolic anti-oxidant and (b) at least one organic phosphite; and (c) at least one carbonate of an alkaline-earth metal in an amount effective to reduce the entrainment of water by the extruded material.
Claim 2
Dependent Claim
69 words
Process for the extrusion of a composition based on an alpha-olefin polymer, followed by a cooling with water of the extruded material, comprising: extruding an alpha-olefin composition which comprises stabilizing amounts of (a) at least one phenolic anti-oxidant and (b) at least one organic phosphite; and (c) at least one carbonate of an alkaline-earth metal in an amount effective to reduce the entrainment of water by the extruded material.
Claim 3
Dependent Claim
14 words
Process according to claim 1, wherein the alpha-olefin polymer is a polymer of propylene.
Claim 4
Dependent Claim
19 words
Process according to claim 1 wherein the phenolic anti-oxidant is selected from the alkylated mono-, poly- and thiobis- phenols.
Claim 5
Dependent Claim
18 words
Process according to claim 1 wherein the organic phosphite is selected from the trialkyl-phosphites and diphosphites of dialkylpentaerythritol.
Claim 6
Dependent Claim
14 words
Process according to claim 1, wherein the carbonate of alkaline-earth metal is calcium carbonate.
Claim 7
Dependent Claim
23 words
Process according to claim 5, wherein the calcium carbonate is in the form of particles whose average diameter is less than 10 microns.
Claim 8
Dependent Claim
30 words
Process according to claim 1, wherein the carbonate of alkaline-earth metal is incorporated into the composition in a proportion of 0.1 to 10 per mil by weight of the polymer.
Claim 9
Dependent Claim
27 words
Process according to claim 1, wherein the carbonate of alkaline-earth metal is in the form of particles of an average diameter of between 0.05 and 0.8 microns.
Claim 10
Dependent Claim
14 words
Process according to claim 1, wherein it is applied to the fabrication of films.
Claim 11
Dependent Claim
12 words
Process according to claim 9, wherein the films are cut into strips.
Claim 12
Dependent Claim
30 words
Process according to claim 1, wherein the carbonate of alkaline-earth metal is incorporated into the composition in a proportion of 0.2 to 0.3 per mil by weight of the polymer.
References Cited (Backward Citations)
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Cited
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Cited
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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) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |