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US4208528A
Expired / Lapsed
US
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Process of preparing finely divided thermoplastic resins
Assignee: Equistar Chemicals LP
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Filing: 1978-08-17
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Granted: 1980-06-17
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Expires: 1998-08-17
Abstract
Abstract Powders of thermoplastic resins such as polyethylene homopolymer and ethylene-vinyl acetate copolymer are obtained by agitating molten resin in admixture with water and in the presence of a dispersing amount of an alkali metal salt of an organophosphate ester. The particle size distribution of the dispersed resin can, if desired, be regulated by the addition of base thereto.
Inventors
- 👤 Dorothee M. McClain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:01
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J3/12; C08J3/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
72 words
A process for preparing in finely divided form a solid thermoplastic polyolefin resin which comprises: (a) agitating a mixture of the resin while in the molten state, a dispersion-forming amount of water, and a dispersion-forming amount of an alkali metal salt of an organophosphate ester dispersing agent, to provide a hot aqueous dispersion of the resin; and, (b) cooling the dispersion to below about 100° C. to provide solid particles of resin.
Claim 2
Dependent Claim
72 words
A process for preparing in finely divided form a solid thermoplastic polyolefin resin which comprises: (a) agitating a mixture of the resin while in the molten state, a dispersion-forming amount of water, and a dispersion-forming amount of an alkali metal salt of an organophosphate ester dispersing agent, to provide a hot aqueous dispersion of the resin; and, (b) cooling the dispersion to below about 100° C. to provide solid particles of resin.
Claim 3
Dependent Claim
85 words
A process for preparing in finely divided form a solid thermoplastic polyolefin which comprises: (a) agitating a mixture of the resin while in the molten state, a dispersion-forming amount of water, a base and a dispersion-forming amount of an alkali metal salt of an organophosphate ester dispersing agent in the presence of a base to regulate the particle size distribution of the dispersed resin; and, (b) cooling the dispersion to below about 100° C. to provide solid particles of resin of controlled particle size distribution.
Claim 4
Dependent Claim
85 words
A process for preparing in finely divided form a solid thermoplastic polyolefin which comprises: (a) agitating a mixture of the resin while in the molten state, a dispersion-forming amount of water, a base and a dispersion-forming amount of an alkali metal salt of an organophosphate ester dispersing agent in the presence of a base to regulate the particle size distribution of the dispersed resin; and, (b) cooling the dispersion to below about 100° C. to provide solid particles of resin of controlled particle size distribution.
Claim 5
Dependent Claim
12 words
The process of claim 2 wherein the resin is polyethylene or polypropylene.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |