US2653145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for producing copolymers in the form of discrete particles
Assignee: Whitney Blake Co
•
Filing: 1951-03-15
•
Granted: 1953-09-22
•
Expires: 1971-03-15
Abstract
No abstract record available.
Inventors
- 👤 Walter P Hohenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:35
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
THE METHOD OF PRODUCING SOLID BUT RELATIVELY SOFT, RUBBER-LIKE COPOLYMERS WHICH, ALTHOUGH TACKY AT THE TEMPERATURE EMPLOYED IN FORMING THEM, ARE NEVERTHELESS SUBSTANTIALLY FREE, AS FINALLY OBTAINED, FROM OCCLUDED ELECTROLYTES AND HYGROSCOPIC SUBSTANCES DELETERIOUSLY AFFECTING ELECTRICAL INSULATION PROPERTIES, WHICH COMPRISES INTERMIXING A PLURALITY OF INCLUDING AT LEAST ONE VINYLIDENE COMPOUND, AT LEAST ONE CONJUGATED ALIPHATIC DIOLEFINIC COMPOUND COPOLYMERIZABLE THEREWITH TO YIELD SUCH A RELATIVELY SOFT, RUBBER-LIKE COPOLYMER PRODUCT, A POLYMERIZATION CATALYST AND A DISPERSING FLUID; THE DISPERSING FLUID BEING SUBSTANTIALLY A NON-SOLVENT FOR THE MONOMERS AND ALSO FOR THE RESULTANT COPOLYMER; MECHANICALLY AGITATING THE INTERMIXTURE AT A TEMPERATURE BETWEEN ABOUT 120* F. AN ABOUT 325* F. UNTIL SOLID BUT TACKY PARTICLES OF THE DESIRED COPOLYMER ARE PRODUCED; CONTINUING THE MECHANICAL AGITATION TO PREVENT AGGLOMERATION OF THE PARTICLES WHILE CHILLING THE INTERMIXTURE TO A TEMPERATURE ABOVE TH FREEZING POINT OF THE DISPERSING FLUID AND BELOW ABOUT 50* F. AT WHICH SAID PARTICLES ARE NON-TACKY; AND FREEING THE COPOLYMER PARTICLES FROM THE DISPERSING FLUID WHILE THE PARTICLES ARE IN THE SAID CHILLED, NON-TACKY AND NON-AGGLOMERATING CONDITION.
Claim 2
Independent Claim
174 words
THE METHOD OF PRODUCING SOLID BUT RELATIVELY SOFT, RUBBER-LIKE COPOLYMERS WHICH, ALTHOUGH TACKY AT THE TEMPERATURE EMPLOYED IN FORMING THEM, ARE NEVERTHELESS SUBSTANTIALLY FREE, AS FINALLY OBTAINED, FROM OCCLUDED ELECTROLYTES AND HYGROSCOPIC SUBSTANCES DELETERIOUSLY AFFECTING ELECTRICAL INSULATION PROPERTIES, WHICH COMPRISES INTERMIXING A PLURALITY OF INCLUDING AT LEAST ONE VINYLIDENE COMPOUND, AT LEAST ONE CONJUGATED ALIPHATIC DIOLEFINIC COMPOUND COPOLYMERIZABLE THEREWITH TO YIELD SUCH A RELATIVELY SOFT, RUBBER-LIKE COPOLYMER PRODUCT, A POLYMERIZATION CATALYST AND A DISPERSING FLUID; THE DISPERSING FLUID BEING SUBSTANTIALLY A NON-SOLVENT FOR THE MONOMERS AND ALSO FOR THE RESULTANT COPOLYMER; MECHANICALLY AGITATING THE INTERMIXTURE AT A TEMPERATURE BETWEEN ABOUT 120* F. AN ABOUT 325* F. UNTIL SOLID BUT TACKY PARTICLES OF THE DESIRED COPOLYMER ARE PRODUCED; CONTINUING THE MECHANICAL AGITATION TO PREVENT AGGLOMERATION OF THE PARTICLES WHILE CHILLING THE INTERMIXTURE TO A TEMPERATURE ABOVE TH FREEZING POINT OF THE DISPERSING FLUID AND BELOW ABOUT 50* F. AT WHICH SAID PARTICLES ARE NON-TACKY; AND FREEING THE COPOLYMER PARTICLES FROM THE DISPERSING FLUID WHILE THE PARTICLES ARE IN THE SAID CHILLED, NON-TACKY AND NON-AGGLOMERATING CONDITION.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |