US4278732A
Expired / Lapsed
US
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Antilumping expandable styrene polymers
Assignee: Lyondell Chemical Technology LP
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Filing: 1980-10-01
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Granted: 1981-07-14
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Expires: 2000-10-01
Abstract
Abstract Expandable styrene polymer particles are surface-coated with decaglyceroloctaoleate to prevent the particles from lumping together during expansion. The coating is applied by adding 0.02-0.05 part of decaglyceroloctaoleate to an aqueous suspension containing 100 parts of polymer particles subsequent to impregnating the mixture with a blowing agent, or by dry blending polymer particles with the octaoleate.
Inventors
- 👤 John P. Spicuzza, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:48
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/224; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/101; C08K5/103; C08J2325/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
Expandable styrene polymer particles which will not lump during pre-expansion, comprising styrene polymer particles containing a blowing agent and having on their surface from 0.02 to 0.05 percent by weight based on polymer of decaglyceroloctaoleate.
Claim 2
Dependent Claim
35 words
Expandable styrene polymer particles which will not lump during pre-expansion, comprising styrene polymer particles containing a blowing agent and having on their surface from 0.02 to 0.05 percent by weight based on polymer of decaglyceroloctaoleate.
Claim 3
Dependent Claim
11 words
The composition of claim 1 wherein said styrene polymer is polystyrene.
Claim 4
Dependent Claim
23 words
The composition of claim 1 wherein said styrene polymer is a copolymer of a vinylaromatic monomer with a minor amount of maleic anhydride.
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) | 1984-07-13 | 1985-01-12 | 1985-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-13 | 1989-01-12 | 1989-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-13 | 1993-01-12 | 1993-07-14 | $7700.00 | Window Closed / Lapsed |