Patent US3607807A successfully refreshed from Google Patents.
US3607807A
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US
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High solids rubber latex and method
Assignee: DSM Copolymer Inc
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Filing: 1969-06-13
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Granted: 1971-09-21
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Expires: 1989-06-13
Abstract
Abstract The preparation of a high solids, low viscosity rubber latex by blending a fast reaction latex of small particles with a slow reaction latex of large particles, before concentration, and preferably before stripping for removal of unreacted monomers, stripping and concentrating the blend to about 50 percent solids, freezing the concentrate after acidifying to a pH of about 8.3, and then thawing and concentrating the frozen blend to a solids content above 60 percent.
Inventors
- 👤 George R Huddleston Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:25
CPC Classifications
C; C08; C08C; C08C1/00; C08C1/02; C08C1/075
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
21 words
The method as claimed in claim 1 in which the long chain fatty acid soap is a soap of oleic acid.
Claim 2
Dependent Claim
31 words
The method as claimed in claim 1 in which the slow reaction is carried out in the presence of a rosin soap in admixture with a long chain fatty acid soap.
Claim 3
Dependent Claim
25 words
The method as claimed in claim 1 in which the latices are stripped of unreacted monomer after blending but before removal of water to concentrate.
Claim 4
Dependent Claim
48 words
The method as claimed in claim 1 in which the slow reaction latex and the fast reaction latex are blends in the ratio of 40-90 parts by weight on a solids content basis of the slow reaction latex to 60-10 parts by weight of the fast reaction latex.
Claim 5
Dependent Claim
43 words
The method as claimed in claim 1 in which the slow reaction latex and the fast reaction latex are blends in the ratio of 60-80 parts by weight of the slow reaction latex to 40-20 parts by weight of the fast reaction latex.
Claim 6
Dependent Claim
43 words
The method as claimed in claim 1 in which the slow reaction latex and the fast reaction latex are blends in the ratio of 70 parts by weight of the slow reaction latex to 30 parts by weight of the fast reaction latex.
Claim 7
Dependent Claim
28 words
The method as claimed in claim 1 in which the blend is concentrated to a solids content within the range of 45-50 percent pH adjustment and freezing. .
Claim 8
Dependent Claim
39 words
The method as claimed in claim 1 in which the blend, after acidification, is frozen in the form of a layer on a continuously moving refrigerated surface and the frozen layer is continuously removed from the surface for thawing.
Claim 9
Dependent Claim
44 words
A stable, high solids, low viscosity latex of an agglomerated rubber selected from the group consisting of a homopolymer of a conjugated diolefin and a copolymer of a conjugated diolefin with one or more monoethylenically unsaturated monomers, prepared by the method of claim 1.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |