US3303159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making articles of crystalline polystyrene containing lower polymers of alkenyl aromatic monomers
Assignee: Dow Chemical Co
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Filing: 1962-01-11
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Granted: 1967-02-07
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Expires: 1982-01-11
Abstract
No abstract record available.
Inventors
- 👤 Frank L Saunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:52
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; D; D01; D01F; D01F6/00; D01F6/02; D01F6/20; D01F6/22; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06; C08L25/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
METHOD OF MAKING ARTICLES OF ISOTACTIC POLYSTYRENE HAVING ENHANCED CRYSTALIZATION RATESWHICH COMPRISES (I) PREPARING A HOMOGENEOUS MIXTURE OF ISOTACTIC POLYSTYRENE AND AT LEAST 1 WEIGHT PERCENT BASED ON THE WEIGHT OF SAID ISOTACTIC POLYSTYRENE OF A LOWER POLYMER OF AN ALKENYL AROMATIC MONOMER OF THE BENZENE SERIES, SAID LOWER POLYMER BEING LIQUID AT TEMPEERATURES OF ABOUT 60%C. OR LESS; (II) FORMING SAID HOMOGENEOUS MIXTURE INTO A SHAPED ARTICLE AT A TEMPERATURE BETWEEN ABOUT 100%C. AND 300% C.; AND (III) THEREAFTER ANNEALING SAID SHAPED ARTICLE AT A TEMPERATURE BETWEEN ABOUT 100%C. AND 200%C. FOR A PERIOD BETWEEN ABOUT 30 MINUTES TO 2 HOURS TO EFFECT CRYSTALLIZATION THEREOF.
Claim 2
Dependent Claim
106 words
METHOD OF MAKING ARTICLES OF ISOTACTIC POLYSTYRENE HAVING ENHANCED CRYSTALIZATION RATESWHICH COMPRISES (I) PREPARING A HOMOGENEOUS MIXTURE OF ISOTACTIC POLYSTYRENE AND AT LEAST 1 WEIGHT PERCENT BASED ON THE WEIGHT OF SAID ISOTACTIC POLYSTYRENE OF A LOWER POLYMER OF AN ALKENYL AROMATIC MONOMER OF THE BENZENE SERIES, SAID LOWER POLYMER BEING LIQUID AT TEMPEERATURES OF ABOUT 60%C. OR LESS; (II) FORMING SAID HOMOGENEOUS MIXTURE INTO A SHAPED ARTICLE AT A TEMPERATURE BETWEEN ABOUT 100%C. AND 300% C.; AND (III) THEREAFTER ANNEALING SAID SHAPED ARTICLE AT A TEMPERATURE BETWEEN ABOUT 100%C. AND 200%C. FOR A PERIOD BETWEEN ABOUT 30 MINUTES TO 2 HOURS TO EFFECT CRYSTALLIZATION THEREOF.
Claim 3
Dependent Claim
42 words
A CRYSTALLINE ARTICLE PREPARED FROM A HOMOGENEOUS MIXTURE COMPRISED OF ISOTACTIC POLYSTYRENE AND AT LEST 1 WEIGHT PERCENT BASED ON THE WEIGHT OF SAID ISOTACTIC POLYSTYRENE OF A LOWER POLYMER OF AN ALKENYL AROMATIC MONOLIQUID AT A TEMPERATURE OF ABOUT 60%C. LESS.
Claim 4
Dependent Claim
42 words
A CRYSTALLINE ARTICLE PREPARED FROM A HOMOGENEOUS MIXTURE COMPRISED OF ISOTACTIC POLYSTYRENE AND AT LEST 1 WEIGHT PERCENT BASED ON THE WEIGHT OF SAID ISOTACTIC POLYSTYRENE OF A LOWER POLYMER OF AN ALKENYL AROMATIC MONOLIQUID AT A TEMPERATURE OF ABOUT 60%C. LESS.
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) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |