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US3895035A
Expired / Lapsed
US
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Process for the production of pourable, powdery, filler-containing rubber mixtures from rubber solutions
Assignee: Huels AG
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Filing: 1973-03-21
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Granted: 1975-07-15
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Expires: 1993-03-21
Abstract
Abstract Pourable, discrete, finely-divided, tack-free elastomer particles, preferably containing filler, are prepared from an aqueous elastomer emulsion comprising an elastomer dissolved in a volatile inert organic solvent having an emulsifying amount of an alkylamine or alkenylamine oxyalkylate surfactant and an aqueous suspension of a filler, which process comprises gradually adding the filler-containing aqueous elastomer emulsion into a hot aqueous precipitating bath maintained at a pH of 7 or less, and simultaneously evaporating the organic solvent to obtain a precipitate of particles in water, separating therefrom and drying to produce the said pourable filler-containing elastomer particles. The pourable particles are particularly suitable in vulcanization processes to form shaped objects.
Inventors
- 👤 Gerhard Berg
- 👤 Karl-Heinz Nordsiek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:57
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/21; C08J3/215; C08J2321/00
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
50 words
A PROCESS FOR PRODUCING POURABLE, DISCRETE, FINELYDIVIDED, TACK-FREE, ELASTOMER PARTICLES, SAID PROCESS COMPRISING PREPARING AN EMULSION COMPRISING WATER, A VOLATILE INERT WATER INSOLUBLE ORGANIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF ALKANES AND CYCLOALKANES HAVING DISSOLVED THEREIN AN ELASTOMER, AND AN EMULSIFYING AMOUNT OF A SURFACTANT OF THE GENERAL FORMULA
Claim 2
Dependent Claim
50 words
A PROCESS FOR PRODUCING POURABLE, DISCRETE, FINELYDIVIDED, TACK-FREE, ELASTOMER PARTICLES, SAID PROCESS COMPRISING PREPARING AN EMULSION COMPRISING WATER, A VOLATILE INERT WATER INSOLUBLE ORGANIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF ALKANES AND CYCLOALKANES HAVING DISSOLVED THEREIN AN ELASTOMER, AND AN EMULSIFYING AMOUNT OF A SURFACTANT OF THE GENERAL FORMULA
Claim 3
Dependent Claim
54 words
A process for producing pourable, discrete, finely divided, tack-free, filler-containing elastomer particles, said process comprising preparing an emulsion comprising water, a volatile inert water insoluble organic solvent selected from the group consisting of alkanes and cycloalkanes having dissolved therein an elastomer, a filler, and an emulsifying amount of a surfactant of the general formula
Claim 4
Dependent Claim
54 words
A process for producing pourable, discrete, finely divided, tack-free, filler-containing elastomer particles, said process comprising preparing an emulsion comprising water, a volatile inert water insoluble organic solvent selected from the group consisting of alkanes and cycloalkanes having dissolved therein an elastomer, a filler, and an emulsifying amount of a surfactant of the general formula
Claim 5
Dependent Claim
49 words
A process for producing pourable, discrete, finely-divided, tack-free, filler-containing elastomer particles comprising, preparing an emulsion in water of an elastomer dissolved in a volatile inert water insoluble organic solvent selected from the group consisting of alkanes and cycloalkanes using an emulsifying amount of a surfactant having the general formula
Claim 6
Dependent Claim
49 words
A process for producing pourable, discrete, finely-divided, tack-free, filler-containing elastomer particles comprising, preparing an emulsion in water of an elastomer dissolved in a volatile inert water insoluble organic solvent selected from the group consisting of alkanes and cycloalkanes using an emulsifying amount of a surfactant having the general formula
Claim 7
Dependent Claim
28 words
The process of claim 3 wherein said elastomer emulsion includes mineral oil plasticizer in amounts of 1 to 200% by weight, based on the weight of the elastomer.
Claim 8
Dependent Claim
19 words
The process of claim 3 wherein said filler is carbon black and said suspension of fillers includes an emulsifier.
Claim 9
Dependent Claim
18 words
THe process of claim 3 wherein said filler is silicic acid and suspension of fillers includes an emulsifier.
Claim 10
Dependent Claim
27 words
The process of claim 3 wherein said surfactant is an alkylamine oxyalkylate, R1 has 12-18 carbon atoms, and X and Y are integers of 6 to 20.
Claim 11
Dependent Claim
27 words
The process of claim 3 wherein said surfactant is an alkenylamine oxyalkylate, R1 has 12-18 carbon atoms, and X and Y are integers of 6 to 20.
Claim 12
Dependent Claim
12 words
The process of claim 3 wherein said surfactant is a lauryl oxyalkylate.
Claim 13
Dependent Claim
12 words
The process of claim 3 wherein said surfactant is a myristyline oxyalkylate.
Claim 14
Dependent Claim
12 words
The process of claim 3 wherein said surfactant is a cetylamine oxyalkylate.
Claim 15
Dependent Claim
12 words
The process of claim 3 wherein said surfactant is a stearylamine oxyalkylate.
Claim 16
Dependent Claim
12 words
The process of claim 3 wherein said surfactant is an oleylamine oxyalkylate.
Claim 17
Dependent Claim
29 words
The process of claim 3 wherein the surfactant is present in amounts between 0.05% and 2 % by weight, based on the weight of the elastomer in the solution.
Claim 18
Dependent Claim
24 words
The process of claim 3 wherein an organic solvent is selected from the group consisting of aliphatic and cycloaliphatic hydrocarbons of 5-8 carbon atoms.
Claim 19
Dependent Claim
16 words
The process of claim 3 wherein the emulsification is conducted at temperatures up to 200* C.
Claim 20
Dependent Claim
25 words
The process of claim 3 wherein the filler is present in amounts by weight between 40 and 150% based on the weight of the elastomer.
Claim 21
Dependent Claim
22 words
The process of claim 3 wherein the pH of the precipitating bath is maintained between 1.0 and 3.5 during the precipitation step.
Claim 22
Dependent Claim
15 words
The process of claim 3 wherein the said precipitation bath comprises an alkali metal silicate.
Claim 23
Dependent Claim
31 words
The process of claim 19 wherein the alkali metal silicate is sodium silicate having molar ratios in the solution of Na2O : SiO2 of 2 : 1 to 1 : 4.
Claim 24
Dependent Claim
34 words
The process of claim 19 wherein the amount of alkali metal silicate present in said precipition bath is 1-20 moles of SiO2 per mole of surfactant present in the emulsion added to the bath.
Claim 25
Dependent Claim
19 words
The process of claim 19 wherein the pH of the alkali silicate-containing precipitation bath is between 1.0 and 3.5.
Claim 26
Dependent Claim
23 words
The process of claim 3 wherein the temperature of the precipitation bath is above the azeotrope boiling point of said solvent and water.
Claim 27
Dependent Claim
26 words
The process of claim 3 wherein said separation of said solvent from said bath is conducted by distillation at pressures at, below and above atmospheric pressures.
Claim 28
Dependent Claim
30 words
The process of claim 3 wherein the filler-containing elastomer emulsion also includes auxiliary agents selected from the group consisting of antiaging agents, zinc oxide, stearic acid, sulfur, and vulcanization accelerators.
Claim 29
Dependent Claim
18 words
The process of claim 3 wherein the elastomer is polybutadiene with vinyl group content between 25 and 50%.
Claim 30
Dependent Claim
28 words
The process of claim 3 wherein the elastomer is a copolymer of butadiene with 5-40% styrene and wherein the vinyl group content of the polybutadiene proportion is 8-30%.
Claim 31
Dependent Claim
29 words
A process of producing shaped objects comprising mixing the pourable composition made by the process of claim 2 with sulfur and vulcanization accelerators, and shaping and vulcanizing said mixture.
Claim 32
Dependent Claim
21 words
The process of claim 1 wherein R1 has 12-18 carbon atoms, and X and Y are integers of 6 to 20.
Claim 33
Dependent Claim
21 words
The process of claim 2 wherein R1 has 12-18 carbon atoms, and X and Y are integers of 6 to 20.
Claim 34
Dependent Claim
21 words
The process of claim 3 wherein R1 has 12-18 carbon atoms, and X and Y are integers of 6 to 20.
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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |