US2739142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparation of moldable copolymers of styrene and acrylonitrile
Assignee: Dow Chemical Co
•
Filing: 1953-08-24
•
Granted: 1956-03-20
•
Expires: 1973-08-24
Abstract
No abstract record available.
Inventors
- 👤 Jones Clifford
- 👤 Harris Bronson
- 👤 Frank L Ingley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:53
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F212/10; C08F220/00; C08F220/02; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A METHOD WHICH COMPRISES HEATING IN A POLYMERIZATION REACTION ZONE AT A POLYMERIZATION TEMPERATURE BETWEEN 130* AND 175* C. A HOMOGENEOUS LIQUID REACTION MIXTURE COMPRISING A POLYMERIZABLE COMPOSITION AND A POLYMERIZATION MODIFIER, SAID POLYMERIZABLE COMPOSITION CONSISTING BY WEIGHT OF FROM 20 TO 35 PER CENT ACRYLONITRILE, FROM 80 TO 35 PER CENT STYRENE AND FROM 0 TO 30 PER CENT ALPHA-METHYLSTYRENE, SAID POLYMERIZATION MODIFIER BEING FROM 10 TO 40 PER CENT BY WEIGHT OF THE REACTION MIXTURE AND CONSISTING OF AT LEAST ONE MONOCYCLIC AROMATIC COMPOUND HAVING ONLY BENZOID UNSATURATION AND SELECTED FROM THE CLASS CONSISTING OF AROMATIC HYDROCARBONS OF THE BENZENE SERIES AND NUCLEAR CHLORINATED DERIVATIVES THEREOF, CONTINUING THE HEATING OF SAID REACTION MIXTURE UNTIL THE SAME CONTAINS NOT MORE THAN 70 PER CENT BY WEIGHT OF A COPOLYMERIC PRODUCT AND SEPARATING FROM AT LEAST A PORTION OF THE RESULTING REACTION MIXTURE A COPOLYMERIC PRODUCT HAVING VISCOSITY OF FROM 6 TO 40 CENTIPOISES WHEN MEASURED AS A 10 WEIGHT PER CENT SOLUTION IN BUTANONE AT 25* C.
Claim 2
Independent Claim
168 words
A METHOD WHICH COMPRISES HEATING IN A POLYMERIZATION REACTION ZONE AT A POLYMERIZATION TEMPERATURE BETWEEN 130* AND 175* C. A HOMOGENEOUS LIQUID REACTION MIXTURE COMPRISING A POLYMERIZABLE COMPOSITION AND A POLYMERIZATION MODIFIER, SAID POLYMERIZABLE COMPOSITION CONSISTING BY WEIGHT OF FROM 20 TO 35 PER CENT ACRYLONITRILE, FROM 80 TO 35 PER CENT STYRENE AND FROM 0 TO 30 PER CENT ALPHA-METHYLSTYRENE, SAID POLYMERIZATION MODIFIER BEING FROM 10 TO 40 PER CENT BY WEIGHT OF THE REACTION MIXTURE AND CONSISTING OF AT LEAST ONE MONOCYCLIC AROMATIC COMPOUND HAVING ONLY BENZOID UNSATURATION AND SELECTED FROM THE CLASS CONSISTING OF AROMATIC HYDROCARBONS OF THE BENZENE SERIES AND NUCLEAR CHLORINATED DERIVATIVES THEREOF, CONTINUING THE HEATING OF SAID REACTION MIXTURE UNTIL THE SAME CONTAINS NOT MORE THAN 70 PER CENT BY WEIGHT OF A COPOLYMERIC PRODUCT AND SEPARATING FROM AT LEAST A PORTION OF THE RESULTING REACTION MIXTURE A COPOLYMERIC PRODUCT HAVING VISCOSITY OF FROM 6 TO 40 CENTIPOISES WHEN MEASURED AS A 10 WEIGHT PER CENT SOLUTION IN BUTANONE AT 25* C.
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) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |