US3873645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antistatic polystyrene
Assignee: Individual
•
Filing: 1973-01-09
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Granted: 1975-03-25
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Expires: 1993-01-09
Abstract
Abstract Antistatic polystyrene compositions suitable for being thermoformed into articles having antistatic properties comprise blends of a polymer of a monovinyl aromatic hydrocarbon, certain elastomeric block copolymers and a compatible antistatic agent.
Inventors
- 👤 Leslie A Muirhead
- 👤 William P Millrine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:17
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08K; C08K5/00; C08K5/0008; C08K5/0075; C08K5/16; C08K5/20; C08L51/00; C08L51/04; C08L53/00; C08L53/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
69 words
A TOUGHENED POLYSTYRENE COMPOSITION HAVING IMPROVED ANTISTATIC RETENTION PROPERTIES COMPRISING A PHYSICAL BLEND OF A. FROM ABOUT 20 TO ABOUT 95% BY WEIGHT OF A POLYSTYRENE HOMOPOLYMER OR OF A TOUGHENED POLYSTYRENE OBTAINED BY POLYMERIZATION OF STYRENE MONOMER IN THE PRESENCE OF AN ELASTOMER, B. FROM ABOUT 5 TO ABOUT 40% BY WEIGHT OF A SUBSTANTIALLY UNCROSS-LINKED ELASTOMERIC BLOCK COPOLYMER HAVING A GENERAL FORMULA FROM THE GROUP CONSISTING OF
Claim 2
Dependent Claim
69 words
A TOUGHENED POLYSTYRENE COMPOSITION HAVING IMPROVED ANTISTATIC RETENTION PROPERTIES COMPRISING A PHYSICAL BLEND OF A. FROM ABOUT 20 TO ABOUT 95% BY WEIGHT OF A POLYSTYRENE HOMOPOLYMER OR OF A TOUGHENED POLYSTYRENE OBTAINED BY POLYMERIZATION OF STYRENE MONOMER IN THE PRESENCE OF AN ELASTOMER, B. FROM ABOUT 5 TO ABOUT 40% BY WEIGHT OF A SUBSTANTIALLY UNCROSS-LINKED ELASTOMERIC BLOCK COPOLYMER HAVING A GENERAL FORMULA FROM THE GROUP CONSISTING OF
Claim 3
Dependent Claim
23 words
An improved composition as in claim 1 wherein the antistatic agent is selected from C8-20 aliphatic acid amides and ethylene oxide derivatives thereof.
Claim 4
Dependent Claim
15 words
An improved composition as in claim 2 wherein the antistatic agent is lauric diethanol amide.
Claim 5
Dependent Claim
16 words
An improved composition as in claim 1 wherein the component B is a styrene-butadiene-styrene block copolymer.
Claim 6
Dependent Claim
55 words
An improved composition as in claim 1 containing as an additional component homopolystyrene in a weight ratio of toughened polystyrene to homopolystyrene of 90:10 to 10:90, provided that the elastomeric block copolymer component (a) is not less than 5% by weight and that the antistatic agent component (c) is not less than 0.2% by weight.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |