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US4788231A
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Process for producing pourable powdered rubber containing filler
Assignee: PKU Pulverkautschuk Union GmbH
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Filing: 1988-04-05
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Granted: 1988-11-29
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Expires: 2008-04-05
Abstract
Abstract A process for preparing a pourable powdered rubber containing filler, comprising preparing a blend by mixing a portion of said filler to be incorporated in said rubber product with 0.1 to 6.5 phr of a water-soluble salt of a Group IIa, IIb, IIIa or VIII metal of the Periodic Table and a rubber latex or aqueous emulsion of a rubber solution, adjusting the pH of the blend to a pH ranging from 3.2 to 8.6 by addition of an acid, adding the remaining amount of filler to the pH adjusted blend, separating the rubber containing filler from the aqueous phase of the blend, and drying the powdered rubber product obtained.
Inventors
- 👤 Hans-Jurgen Smigerski
- 👤 Uwe Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:43
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/21; C08J3/212; C08J2321/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
110 words
A process for preparing a pourable powdered rubber containing filler, comprising: preparing a blend by mixing a portion of said filler to be incorporated in said rubber product with 0.1 to 6.5 phr of a water-soluble salt of a Group IIa, IIb, IIIa or VIII metal of the Periodic Table and a rubber latex or aqueous emulsion of a rubber solution; adjusting the pH of the blend to a pH ranging from 3.2 to 8.6 by addition of an acid; adding the remaining amount of filler to the pH adjusted blend; separating the rubber containing filler from the aqueous phase of the blend; and drying the powdered rubber product obtained.
Claim 2
Dependent Claim
110 words
A process for preparing a pourable powdered rubber containing filler, comprising: preparing a blend by mixing a portion of said filler to be incorporated in said rubber product with 0.1 to 6.5 phr of a water-soluble salt of a Group IIa, IIb, IIIa or VIII metal of the Periodic Table and a rubber latex or aqueous emulsion of a rubber solution; adjusting the pH of the blend to a pH ranging from 3.2 to 8.6 by addition of an acid; adding the remaining amount of filler to the pH adjusted blend; separating the rubber containing filler from the aqueous phase of the blend; and drying the powdered rubber product obtained.
Claim 3
Dependent Claim
28 words
The process of claim 1, wherein said blend contains a solvent, and said solvent is removed from said blend after the pH of the blend has been adjusted.
Claim 4
Dependent Claim
24 words
The process of claim 1, wherein at least 50 wt. % of the filler is incorporated in said blend initially at the blend's formulation.
Claim 5
Dependent Claim
27 words
The process of claim 1, wherein said metal salt is magnesium chloride, zinc sulfate, aluminum chloride, aluminum sulfate, ferric chloride, ferric sulfate, cobalt nitrate or nickel sulfate.
Claim 6
Dependent Claim
11 words
The process of claim 4, wherein said salt is aluminum sulfate.
Claim 7
Dependent Claim
13 words
The process of claim 1, wherein said blend contains an alkali metal silicate.
Claim 8
Dependent Claim
29 words
The process of claim 6, wherein said blend contains up to 5 parts by weight of silica, as an alkali metal silicate, per 100 parts by weight of rubber.
Claim 9
Dependent Claim
24 words
The process of claim 1, wherein the pH of the blend is decreased to 2.5 prior to separating the rubber from the aqueous phase.
Claim 10
Dependent Claim
35 words
The process of claim 1, wherein the pH of the blend is decreased to 2.5 prior to separating the rubber from the aqueous phase when preparing powdered rubbers which have a filler ratio ≧100 phr.
Claim 11
Dependent Claim
28 words
The process of claim 1, wherein said rubber is a homopolymer of a conjugated diene selected from the group consisting of 1,3-butadiene, isoprene, piperylene, 2-chloro-1,3-butadiene, 2,3-dichloro-1,3-butadiene and 2,3-dimethyl-1,3-butadiene.
Claim 12
Dependent Claim
41 words
The process of claim 1, wherein said rubber is a copolymer formed from a combination of at least two conjugated dienes or is a copolymer of at least one conjugated diene with styrene, α-methylstyrene, acrylonitrile, acrylic acid, methacrylic acid or vinylpyridine.
Claim 13
Dependent Claim
20 words
The process of claim 1, wherein said powdered rubber product obtained has a particle distribution of less than 10 mm.
Claim 14
Dependent Claim
16 words
The process of claim 12, wherein said particle size distribution ranges from 50 μm to 5mm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |