US4452928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Additive-containing polyolefin beads and process for their preparation
Assignee: El Paso Products Co
•
Filing: 1982-11-08
•
Granted: 1984-06-05
•
Expires: 2002-11-08
Abstract
Abstract The invention provides an additive-containing polyolefin having an inner bead of a first polyolefin and an outer adherent coating of a second polyolefin encapsulating the additive.
Inventors
- 👤 Charles A. Trischman
- 👤 Paula S. Weissberger
- 👤 Robert B. Steinert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:22
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; C08J2323/00; C08J2323/02; C08J2423/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
69 words
A process for the production of an additive-containing alpha-olefin polymer composition comprising: intimately contacting beads of a first polyolefin with an additive and a solution of a second polyolefin in a hydrocarbon solvent, the second polyolefin having a higher solubility in hydrocarbon solvents than the first polyolefin; evaporating the solvent in at least one evaporation zone, and recovering beads coated with precipated second polyolefin in admixture with the additive.
Claim 2
Dependent Claim
69 words
A process for the production of an additive-containing alpha-olefin polymer composition comprising: intimately contacting beads of a first polyolefin with an additive and a solution of a second polyolefin in a hydrocarbon solvent, the second polyolefin having a higher solubility in hydrocarbon solvents than the first polyolefin; evaporating the solvent in at least one evaporation zone, and recovering beads coated with precipated second polyolefin in admixture with the additive.
Claim 3
Dependent Claim
32 words
A process according to claim 1, wherein the hydrocarbon solvent is selected from olefinic or paraffinic hydrocarbons containing from 3 to 5 carbon atoms in the molecule, or mixtures of such hydrocarbons.
Claim 4
Dependent Claim
22 words
A process according to claim 1, wherein the solvent to total polyolefins weight ratio is maintained between about 2:98 and about 80:20.
Claim 5
Dependent Claim
29 words
A process according to claim 1, in which the first polyolefin is a polymer of at least one alpha-olefin having from 2 to 18 carbon atoms in the molecule.
Claim 6
Dependent Claim
32 words
A process according to claim 1, in which the first polyolefin is an interpolymer of ethylene and at least one other alpha-olefin containing from 4 to 18 carbon atoms in the molecule.
Claim 7
Dependent Claim
18 words
A process according to claim 1, in which the first polyolefin is an interpolymer of ethylene and butene-1.
Claim 8
Dependent Claim
29 words
A process according to claim 1, in which the second polyolefin is a polymer of at least one alpha-olefin having from 2 to 18 carbon atoms in the molecule.
Claim 9
Dependent Claim
32 words
A process according to claim 1, in which the second polyolefin is an interpolymer of ethylene and at least one other alpha-olefin containing from 4 to 18 carbon atoms in the molecule.
Claim 10
Dependent Claim
18 words
A process according to claim 1, in which the second polyolefin is an interpolymer of ethylene and butene-1.
Claim 11
Dependent Claim
27 words
A process according to claim 1, in which the weight ratio of the second polyolefin to the first polyolefin is maintained between about 0.5:100 and about 10:100.
Claim 12
Dependent Claim
17 words
A process according to claim 10, wherein the weight ratio is between about 0.7:100 and about 6:100.
Claim 13
Dependent Claim
32 words
A process according to claim 1, wherein the additive is provided in amounts ranging from about 0.01 to about 5 percent based on the total weight of the first and second polyolefin.
Claim 14
Dependent Claim
41 words
A process according to claim 1 wherein the beads of the first polymer and the solution of the second polymer in a hydrocarbon solvent have been produced in situ in a slurry polymerization process employing said hydrocarbon solvent as liquid diluent.
Claim 15
Dependent Claim
29 words
A process according to claim 13 wherein the first and second polymers are polymers of at least one alpha-olefin having from 2 to 18 carbon atoms in the molecule.
Claim 16
Dependent Claim
32 words
A process according to claim 13 wherein the first and second polymers are interpolymers of ethylene and butene-1 and the hydrocarbon solvent is a mixture of butene-1 and butane in liquid state.
References Cited (Backward Citations)
US2966474A
Cited
US3455871A
Cited
US3669722A
Cited
US4045403A
Cited
US4165406A
Cited
US4256805A
Cited
US4039507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |