Patent US3311842A successfully refreshed from Google Patents.
US3907734A
Expired / Lapsed
US
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Method of producing powdered polymers
Assignee: Goodyear Tire and Rubber Co
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Filing: 1973-04-11
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Granted: 1975-09-23
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Expires: 1993-04-11
Abstract
Abstract A method of making free-flowing powder from oil and water emulsions by mixing the oil and water emulsion into a partitioning agent containing hydrophobic silica, drying the particulate composition to obtain a powdery plastic or elastomeric composition and in a special embodiment removing at least part of the hydrophobic silica and reusing it to treat further oil and water emulsions.
Inventors
- 👤 Broeck Theodore R Ten
- 👤 Raymond E Downey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:26
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/16; Y; Y10; Y10S; Y10S528/00; Y10S528/931; Y10S528/934
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
55 words
A METHOD OF MAKING A DRY POWDERY PLASTIC OR ELASTOMER COMPOSITION COMPRISING ADDING WITH INTIMATE MIXING A FINE STREAM OF AT LATEX OF A PLASTIC OR ELASTOMER COMPOSITION IN A PARTITIONING AGENT COMPRISED OF A POWDERY HYDROPHOBIC SILICA TO OBTAIN A WET FREE-FLOWING PARTICULATE MASS, AND DRYING THE WET PARTICULATE MASS TO OBTAIN A POWDER..
Claim 2
Independent Claim
55 words
A METHOD OF MAKING A DRY POWDERY PLASTIC OR ELASTOMER COMPOSITION COMPRISING ADDING WITH INTIMATE MIXING A FINE STREAM OF AT LATEX OF A PLASTIC OR ELASTOMER COMPOSITION IN A PARTITIONING AGENT COMPRISED OF A POWDERY HYDROPHOBIC SILICA TO OBTAIN A WET FREE-FLOWING PARTICULATE MASS, AND DRYING THE WET PARTICULATE MASS TO OBTAIN A POWDER..
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the partition agent is a blend of hydrophobic silica and precipitated silica in the ratio of 15 to 70 percent.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein at least 90 percent of the hydrophobic silica is recovered from the dry powder.
Claim 5
Dependent Claim
16 words
The method of claim 3 wherein the recovered hydrophobic silica is used to treat more latex.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein the latex contains an alkali soap of a fatty acid as the emulsifying agent.
Claim 7
Dependent Claim
15 words
The method of claim 5 wherein the alkali soap is a sodium or potassium soap.
Claim 8
Dependent Claim
22 words
The method of claim 1 wherein the plastic or elastomeric composition is a solid over the temperature range of 20* to 50*C.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein a hundred parts oF latex is used to 4 to 80 parts of hydrophobic silicon dioxide.
Claim 10
Dependent Claim
23 words
The method of claim 1 wherein 5 to 60 percent of precipitated silicon dioxide is used in conjunction with the hydrophobic silicon dioxide.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |