US4238570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel expandable particles of a styrene polymer and process for preparing the same
Assignee: Resonac Corp
•
Filing: 1979-02-23
•
Granted: 1980-12-09
•
Expires: 1999-02-23
Abstract
Abstract Expandable particles of a styrene polymer which comprise on the surface thereof an ester of an aliphatic carboxylic acid with an aliphatic alcohol, the ester having no hydroxyl group in the molecule and being a solid at room temperature, or a mixture of said ester and a finely divided lubricant, and a process for preparing the same.
Inventors
- 👤 Hideaki Shibata
- 👤 Michihisa Osawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:45
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/224; C08J2325/00; C08J2325/02; C08J2325/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
Expandable particles of a styrene polymer containing a blowing agent, said particles having a surface coating consisting essentially of (i) an ester of a saturated fatty acid with a monohydric saturated aliphatic alcohol, or (ii) a triglyceride of a saturated fatty acid, said ester or triglyceride having no hydroxyl group in the molecule and being a solid at room temperature.
Claim 2
Dependent Claim
60 words
Expandable particles of a styrene polymer containing a blowing agent, said particles having a surface coating consisting essentially of (i) an ester of a saturated fatty acid with a monohydric saturated aliphatic alcohol, or (ii) a triglyceride of a saturated fatty acid, said ester or triglyceride having no hydroxyl group in the molecule and being a solid at room temperature.
Claim 3
Dependent Claim
42 words
Expandable particles of a styrene polymer according to claim 1 or claim 1 wherein said ester or triglyceride is contained on the surface of the particles in an amount of 0.03-0.5% by weight calculated on the expandable particles of a styrene polymer.
Claim 4
Dependent Claim
20 words
Expandable particles of a styrene polymer according to claim 1 wherein said coating has a melting point of 50°-110° C.
Claim 5
Dependent Claim
16 words
Expandable particles of a styrene polymer according to claim 1 wherein said coating is a triglyceride.
Claim 6
Dependent Claim
35 words
Expandable particles of a styrene polymer according to claim 1 wherein said finely divided lubricant and said ester or triglyceride are contained on the surface of the particles in a ratio of 1/1-1/300 by weight.
Claim 7
Dependent Claim
22 words
Expandable particles or a styrene polymer according to claim 1 wherein said lubricant is a metal soap or a fatty acid amide.
Claim 8
Dependent Claim
18 words
Expandable particles of a styrene polymer according to claim 1, wherein said ester comprises a finely divided lubricant.
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) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |