US5141772A
Expired / Lapsed
US
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Process for coating polyolefin granules in a fluidized bed
Assignee: Union Carbide Chemicals and Plastics Technology LLC
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Filing: 1991-10-21
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Granted: 1992-08-25
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Expires: 2011-10-21
Abstract
Abstract A low temperature process for coating polymer granules with additives in order to modify the properties of the polymer comprises contacting a fluidized bed of the polymer granules with an aqueous dispersion of additives.
Inventors
- 👤 Ananda M. Chatterjee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:16
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/2053; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
37 words
In the process of applying additives to a fluidized bed of polymer granules to obtain a substantially uniform coating of additive on the polymer granules, the improvement comprising providing additive in the form of an aqueous dispersion.
Claim 2
Dependent Claim
37 words
In the process of applying additives to a fluidized bed of polymer granules to obtain a substantially uniform coating of additive on the polymer granules, the improvement comprising providing additive in the form of an aqueous dispersion.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the dispersion is applied to the polymer granules at a temperature from about 15° C. to about 30° C.
Claim 4
Dependent Claim
28 words
The process of claim 2 wherein the concentration of additive in the dispersion is from about 3% by weight to about 70% by weight based on total dispersion.
Claim 5
Dependent Claim
63 words
In the process of applying additives to a fluidized bed of granules of polymer of at least one straight-chain α-olefin of up to 4 carbon atoms inclusive, thereby obtaining a polymer granule having a substantially uniform coating of additive on the surface thereof, the improvement comprising providing additive as an aqueous dispersion at a temperature from about 15° C. to about 260° C.
Claim 6
Dependent Claim
63 words
In the process of applying additives to a fluidized bed of granules of polymer of at least one straight-chain α-olefin of up to 4 carbon atoms inclusive, thereby obtaining a polymer granule having a substantially uniform coating of additive on the surface thereof, the improvement comprising providing additive as an aqueous dispersion at a temperature from about 15° C. to about 260° C.
Claim 7
Dependent Claim
29 words
The process of claim 4 wherein the concentration of additive in the aqueous dispersion is from about 3% by weight to about 70% by weight based on total dispersion.
Claim 8
Dependent Claim
28 words
The process of claim 5 wherein fluidizing gas in the fluidized bed vaporizes the water of the aqueous dispersion thereby providing the coated polymer as a dry granule.
Claim 9
Dependent Claim
25 words
The process of claim 6 wherein the dispersion is applied to the polymer granules at a temperature from about 15° C. to about 30° C.
Claim 10
Dependent Claim
66 words
In the process of applying stabilizers to a fluidized bed of polypropylene granules to obtain polypropylene granules having a substantially uniform coating of stabilizer on the surface thereof, the improvement comprising providing stabilizer as an aqueous dispersion having a stabilizer concentration from about 3% by weight to about 70% by weight based on total dispersion at a temperature from about 15° C. to about 30° C.
Claim 11
Dependent Claim
66 words
In the process of applying stabilizers to a fluidized bed of polypropylene granules to obtain polypropylene granules having a substantially uniform coating of stabilizer on the surface thereof, the improvement comprising providing stabilizer as an aqueous dispersion having a stabilizer concentration from about 3% by weight to about 70% by weight based on total dispersion at a temperature from about 15° C. to about 30° C.
Claim 12
Dependent Claim
64 words
A process of producing a dry polymer granule having a substantially uniform coating of additive on the surface thereof which comprises fluidizing a bed of the polymer in the form of granules with fluidizing gas at a temperature from about 15° C. to about 260° C., applying an aqueous dispersion of additive to the fluidized bed and vaporizing the water of the aqueous dispersion.
Claim 13
Dependent Claim
64 words
A process of producing a dry polymer granule having a substantially uniform coating of additive on the surface thereof which comprises fluidizing a bed of the polymer in the form of granules with fluidizing gas at a temperature from about 15° C. to about 260° C., applying an aqueous dispersion of additive to the fluidized bed and vaporizing the water of the aqueous dispersion.
Claim 14
Dependent Claim
24 words
The process of claim 9 wherein the polymer is a polymer of at least one lower α-olefin of up to 6 carbon atoms inclusive.
Claim 15
Dependent Claim
22 words
The process of claim 10 wherein the additive is at least one of antioxidants, ultraviolet light stabilizer, processing stabilizer or acid acceptor.
Claim 16
Dependent Claim
15 words
The process of claim 11 wherein the polymer is a homopolymer or copolymer of propylene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |