US4369227A
Expired / Lapsed
US
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Particulate styrene polymers containing blowing agent
Assignee: BASF SE
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Filing: 1982-03-10
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Granted: 1983-01-18
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Expires: 2002-03-10
Abstract
Abstract Particulate styrene polymers which contain a blowing agent and are surface-coated with from 0.05 to 1% by weight of an ester. The coating agent is a hydroxycarboxylic acid ester, or an ester of a carboxylic acid with an oxyalkylated alcohol; tristearyl citrate is a preferred ester. The styrene polymers can be used to produce foam moldings, with short mold dwell times and good welding of the foam particles.
Inventors
- 👤 Klaus Hahn
- 👤 Hans P. Rath
- 👤 Heinz Krapf
- 👤 Isidoor De Grave
- 👤 Manfred Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:47
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/224; C08J2325/00; C08J2325/02; C08J2325/04; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
35 words
A particulate styrene polymer, containing blowing agent, which is surface-coated with from 0.05 to 1% by weight of an ester of a hydroxycarboxylic acid having 3-6 carbon atoms with an alcohol having 10-20 carbon atoms.
Claim 2
Dependent Claim
35 words
A particulate styrene polymer, containing blowing agent, which is surface-coated with from 0.05 to 1% by weight of an ester of a hydroxycarboxylic acid having 3-6 carbon atoms with an alcohol having 10-20 carbon atoms.
Claim 3
Dependent Claim
19 words
A particulate styrene polymer, containing blowing agent, as claimed in claim 1, which is coated with a tristearyl citrate.
Claim 4
Dependent Claim
36 words
A particulate styrene polymer, containing blowing agent, as claimed in claim 1, which is coated with a mixture of a hydroxycarboxylic acid ester and a glycerol ester in the weight ratio of from 5:1 to 1:5.
Claim 5
Dependent Claim
28 words
A particulate styrene polymer, containing blowing agent, as claimed in claim 1, wherein said hydroxycarboxylic acid is citric acid and said alcohol has 10 to 20 carbon atoms.
References Cited (Backward Citations)
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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) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |