US4599366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-static styrene polymer particles
Assignee: Lyondell Chemical Technology LP
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Filing: 1985-12-23
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Granted: 1986-07-08
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Expires: 2005-12-23
Abstract
Abstract Expandable styrene polymer particles which have anti-static and anti-lumping properties during expansion and after molding into an article are produced by adding 0.1 to 0.4 parts of trialkyl alkylalkoxylated quaternary ammonium salts, per 100 parts of polymer particles by coating of the expandable polymer particles with the salts. The salts may be added as sole antistatic agent or in addition to the known internal additives which impart fast-cool and anti-lump properties.
Inventors
- 👤 Haven S. Kesling, Jr.
- 👤 James J. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:27
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/224; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/19; C08J2325/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
93 words
Method of making expandable styrene polymer particles which exhibit anti-lumping and anti-static properties comprising coating the surface of expandable styrene polymer paraticles with 0.1 to 0.4 weight percent bases on polymer of a quaternary ammonium salt having general formula ##STR3## Wherein R may be C 1 -C 11 linear or branched alkyl and mixtures thereof, R' may be oxyethylene, oxypropylene, oxybutylene or mixtures thereof, R" may be C 1 -C 4 linear or branched alkyl, hydroxylalkyl, or benzyl, x may be a integer from 6 to 20, and A may be any anion.
Claim 2
Dependent Claim
93 words
Method of making expandable styrene polymer particles which exhibit anti-lumping and anti-static properties comprising coating the surface of expandable styrene polymer paraticles with 0.1 to 0.4 weight percent bases on polymer of a quaternary ammonium salt having general formula ##STR3## Wherein R may be C 1 -C 11 linear or branched alkyl and mixtures thereof, R' may be oxyethylene, oxypropylene, oxybutylene or mixtures thereof, R" may be C 1 -C 4 linear or branched alkyl, hydroxylalkyl, or benzyl, x may be a integer from 6 to 20, and A may be any anion.
Claim 3
Dependent Claim
19 words
The method claim 1 wherein said coating is accomplished by dry-blending the expandable polymer particles with the ammonium salt.
Claim 4
Dependent Claim
42 words
The method of claim 1 wherein said coating is accomplished by intimately mixing the expandable polymer particles with a solution of ammonium salt in volatile solvent while allowing the solvent to evaporate off leaving the salt on the surface of the particles.
Claim 5
Dependent Claim
30 words
The method of claim 1 wherein said coating is accomplished by spraying a solution of ammonium salt into a fluidized bed of expandable polymer particles and drying off the solvent.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein said styrene polymer particles are polystyrene.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein said styrene polymer particles are a copolymer of styrene with minor amounts of maleic anhydride.
Claim 8
Dependent Claim
20 words
The method of claim 1 wherein said styrene polymer particles are a copolymer of styrene with minor amounts of acrylonitrile.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein said styrene polymer particles are a copolymer of styrene with minor amounts of methyl acid maleate.
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) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |