US3130171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing fast gelling synthetic rubber latex and product
Assignee: DSM Copolymer Inc
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Filing: 1959-03-18
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Granted: 1964-04-21
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Expires: 1979-03-18
Abstract
No abstract record available.
Inventors
- 👤 Jr John D Sutherland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:18
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08C; C08C1/00; C08C1/02; C08C1/075; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
IN A PROCESS FOR PREPARING SPONGE RUBBER INCLUDING THE STEPS OF FOAMING SYNTHETIC RUBBER LATEX AND GELLING THE FOAMED LATEX IN THE PRESENCE OF A GELLING AGENT, THE LATEX BEING PREPARED BY EMULSIONPOLYMERIZATION IN AN AQUEOUS MEDIUM OF AT LEAST ONE POLYMERIZABLE MATERIAL SELECTED FROM THE CLASS CONSISTING OF CONJUGATED DIOLEFINS AND MIXTURES OF CONJUGATED DIOLEFINS AND ETHYLENICALLY UNSATURATED MONOMERS EMPLOYING A LOW TEMPERATURE POLYMERIZATION PROCESS AND A SULFOXYLATE POLYMERIZATION RECIPE INCLUDING POTASIUM AND SODIUM-CONTAINING COMPOUNDS, AGGLOMERATING THE LATEX TO A RELATIVELY LARGE AVERAGE PARTICLE SIZE BY FREEZING AND THAWING AND CONCENTRATING THE AGGLOMERATED LATEX TO A HIGH SOLIDS CONTENT, THE IMPROVEMENT COMPRISING REDUCING THE GELL TIME OF THE FOAMED LATEX BY FOAMING A LATEX POLYMERIZED FROM A RECIPE HAVING A RATIO OF POTASSIUM TO SODIUM BETWEEN 10:10 AND 1.7:1.0 WHEN CALCULATED ON A GRAM ATOMIC WEIGHT BASIS.
Claim 2
Dependent Claim
138 words
IN A PROCESS FOR PREPARING SPONGE RUBBER INCLUDING THE STEPS OF FOAMING SYNTHETIC RUBBER LATEX AND GELLING THE FOAMED LATEX IN THE PRESENCE OF A GELLING AGENT, THE LATEX BEING PREPARED BY EMULSIONPOLYMERIZATION IN AN AQUEOUS MEDIUM OF AT LEAST ONE POLYMERIZABLE MATERIAL SELECTED FROM THE CLASS CONSISTING OF CONJUGATED DIOLEFINS AND MIXTURES OF CONJUGATED DIOLEFINS AND ETHYLENICALLY UNSATURATED MONOMERS EMPLOYING A LOW TEMPERATURE POLYMERIZATION PROCESS AND A SULFOXYLATE POLYMERIZATION RECIPE INCLUDING POTASIUM AND SODIUM-CONTAINING COMPOUNDS, AGGLOMERATING THE LATEX TO A RELATIVELY LARGE AVERAGE PARTICLE SIZE BY FREEZING AND THAWING AND CONCENTRATING THE AGGLOMERATED LATEX TO A HIGH SOLIDS CONTENT, THE IMPROVEMENT COMPRISING REDUCING THE GELL TIME OF THE FOAMED LATEX BY FOAMING A LATEX POLYMERIZED FROM A RECIPE HAVING A RATIO OF POTASSIUM TO SODIUM BETWEEN 10:10 AND 1.7:1.0 WHEN CALCULATED ON A GRAM ATOMIC WEIGHT BASIS.
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) | 1967-04-21 | 1967-10-21 | 1968-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-21 | 1971-10-21 | 1972-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-21 | 1975-10-21 | 1976-04-21 | $7700.00 | Window Closed / Lapsed |