US4879141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
In-reactor stabilization of polyolefins via coated stabilizers
Assignee: Union Carbide Chemicals and Plastics Technology LLC
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Filing: 1988-12-27
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Granted: 1989-11-07
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Expires: 2008-12-27
Abstract
Abstract The present invention includes: (i) a method for making a coated particulate comprising the steps of heating until liquid a polyolefin wax; fluidizing with a hot gas, additive particles selected from the group comprising an antioxidant, a processing stabilizer, an acid acceptor, and mixtures thereof; spraying the liquid polyolefin wax on the heated fluidized additive particles; and maintaining the fluidized additive particles at a temperature which is sufficient to prevent the formation of fibers and adequate to form discrete substantially coated additive particles; (ii) a coated particulate made by the above process; and (iii) a process for providing in-reactor stabilization of a polyolefin during a polymerization reaction, using the coated additives prepared by the above described method.
Inventors
- 👤 Ananda M. Chatterjee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:17
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/201; C08F; C08F10/00; C08J3/22; C08J3/226; C08K; C08K9/00; C08K9/08; C08J2391/00; C08J2391/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
78 words
A method for making a coated particulate comprising the steps of: heating until liquid a polyolefin wax; fluidizing with a hot gas, additive particles selected from the group comprising an antioxidant, a processing stabilizer, an acid acceptor, and mixtures thereof; spraying the liquid polyolefin wax on the heated fluidized additive particles; and maintaining the fluidized additive particles at a temperature which is sufficient to prevent the formation of fibers and adequate to form discrete substantially coated additive particles.
Claim 2
Independent Claim
78 words
A method for making a coated particulate comprising the steps of: heating until liquid a polyolefin wax; fluidizing with a hot gas, additive particles selected from the group comprising an antioxidant, a processing stabilizer, an acid acceptor, and mixtures thereof; spraying the liquid polyolefin wax on the heated fluidized additive particles; and maintaining the fluidized additive particles at a temperature which is sufficient to prevent the formation of fibers and adequate to form discrete substantially coated additive particles.
Claim 3
Dependent Claim
18 words
The method of claim 1, wherein particles having sizes between about 1 and about 8000 micrometers are formed.
Claim 4
Dependent Claim
11 words
The method of claim 1, wherein the polyolefin wax is polypropylene.
Claim 5
Dependent Claim
11 words
The method of claim 1, wherein the polyolefin wax is polyethylene.
Claim 6
Dependent Claim
13 words
The method of claim 1, wherein the hot gas is an inert gas.
Claim 7
Dependent Claim
23 words
The method of claim 1, wherein the polyolefin wax is heated at a temperature in the range between 110° C. and 180° C.
Claim 8
Dependent Claim
23 words
The method of claim 1, wherein the olefin wax is heated at a temperature in the range between 130° C. and 165° C.
Claim 9
Dependent Claim
23 words
The method of claim 1, wherein the polyolefin wax is heated at a temperature in the range between 110° C. and 130° C.
Claim 10
Dependent Claim
21 words
The method of claim 1, wherein said fluidizing gas is heated to a temperature between about 150° C. and 180° C.
Claim 11
Dependent Claim
25 words
The method of claim 1, wherein the steps for making the coated particulate can be repeated to dispose a second coating on the coated particulate.
Claim 12
Dependent Claim
15 words
The method of claim 1, wherein the additive is a combination of two dissimilar antioxidants.
Claim 13
Dependent Claim
40 words
The method of claim 1, wherein the additive is a member of the group: 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl) benzene; octadecyl 3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate; tetrakis[methylene (3,5-di-tert-butyl-4-hydroxyhydrocinnamate] methane; tris[3,5-di-t-butyl-4-hydroxybenzyl)isocyanurate; 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid triester with 1,3,5-tris(2-hydroxyethyl)-striazine-2,4,6(1H,3H,5H)-trione; 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl) 1,3,5-triazine-2,4,6-(1H,3H,5H)-trione; bis-[3,3-bis(4'-hydroxy-3'tert-butyl-phenyl)-butanoic acid]-glycolester; 2,2'-methylenebis-(4-methyl-6-tertiary-butyl-phenol-terephthalate; 2,2-bis[4-2-(3,5-di-tert-butyl-4-hydroxyhydrocinnamoyloxy)) ethoxy-phenyl]propane; calcium bis[monoethyl(3,5-di-tert-butyl-4-hydroxybenzyl)phosphonate]; 1,2-bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamoyl)hydrazine; and 2,2'-oxamidobis-[ethyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].
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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) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |