US4278731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast-cooling styrene polymer foams
Assignee: Arco Polymers Inc
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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 which have fast cooling rates during molding are produced by dry blending styrene polymer particles in the presence of 0.06 to 0.60 parts of a mixture of alkyl esters of fatty acids per 100 parts of polymer particles. The ester mixture may be added as sole fast cool agent or in addition to the known internal additives which impart fast cool properties.
Inventors
- 👤 John P. Spicuzza, Jr.
- 👤 John G. Klepic, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:58
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/224; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/101; C08J2325/00; F; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
A composition comprising a styrene polymer particles containing dispersed throughout 3 to 20 weight percent of a blowing agent and coated on the surface of said particles with 0.05 to 0.6 weight percent of a mixture of esters having general formula RCO 2 R', wherein R and R' may be the same or different and are long chain alkyl groups having from 12 to 18 carbon atoms and which mixture of esters is composed of 20 to 30 weight percent of C 14 or lower alkyls, 50 to 55 weight percent of C 16 alkyls and 20 to 25 weight percent of C 18 alkyls.
Claim 2
Dependent Claim
105 words
A composition comprising a styrene polymer particles containing dispersed throughout 3 to 20 weight percent of a blowing agent and coated on the surface of said particles with 0.05 to 0.6 weight percent of a mixture of esters having general formula RCO 2 R', wherein R and R' may be the same or different and are long chain alkyl groups having from 12 to 18 carbon atoms and which mixture of esters is composed of 20 to 30 weight percent of C 14 or lower alkyls, 50 to 55 weight percent of C 16 alkyls and 20 to 25 weight percent of C 18 alkyls.
Claim 3
Dependent Claim
11 words
The composition of claim 1 wherein the styrene polymer is polystyrene.
Claim 4
Dependent Claim
19 words
The composition of claim 1 wherein the styrene polymer is a copolymer of styrene with minor amounts of acrylonitrile.
Claim 5
Dependent Claim
20 words
The composition of claim 1 wherein the styrene polymer is a copolymer of styrene with minor amounts of maleic anhydride.
Claim 6
Dependent Claim
21 words
The composition of claim 1 wherein the styrene polymer is a copolymer of styrene with minor amounts of methyl acid maleate.
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) | 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 |