US3878153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of mixing two elastomers
Assignee: Cities Service Co
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Filing: 1971-11-26
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Granted: 1975-04-15
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Expires: 1991-11-26
Abstract
Abstract Homogeneous blends of elastomers are produced by mixing an elastomer in latex form with an elastomer dissolved in an organic solvent to form a pseudoemulsion in which the two elastomers are thoroughly mixed in the liquid phase. Both of the mixed elastomers are then coagulated and agglutinated to provide the blend. The latex is at least partially coagulated prior to coagulation of the dissolved elastomer. Subsequently the solvent is vaporized and removed from the pseudoemulsion to effect coagulation of the dissolved elastomer in the presence of elastomer from the latex which has already been coagulated, and the two elastomers are thus agglutinated.
Inventors
- 👤 Richard E Driscoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:35
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/005; C08J3/20; C08J3/205; C08J3/21; C08J3/212; C08J2321/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
166 words
IN A PROCESS FOR PRODUCING A HOMOGENOUS BLEND OF ELASTOMERS BY MIXING AN ELASTOMER INLATEX FORM WITH AN ELASTOMER DISSOLVED IN A WATER IMMISCIBLE ORGANIC SOLVENT TO FORM A PSEUDOEMULSION IN WHICH THE TWO ELASTOMERS ARE MIXED IN THE LIQUID PHASE AND BOTH OF THE MIXED ELASTOMERS ARE THEN COAGULATED AND AGGLUTINATED TO PROVIDE A BLEND OF THE TWO ELASTOMERS, THE IMPROVED METHOD WHICH COMPRISES THE FOLLOWING STEPS: A. MIXING A TALEX COAGULATING AGENT INTO THE AQUEOUS PHASE OF SAID PSEUDOEMULSION AND PARTIALLY COAGULATING THE ELASTOMER OF THE LATEX PRIOR TO SUBSTANTIAL VAPORIZATION OF SAID SOLVENT AND HENCE PRIOR TO COAGUALTION OF THE DISSOLVED ELASTOMER, B. INTRODUCING THE PSEUDOEMULSION FOLLOWING STEP (A) INTO A HOT WATER BATH WHICH CONTAINS A LATEX COAGULATING AGENT, VAPORIZING SAID ORGANIC SOLVENT, COAGUALTING THE DISSOLVED ELASTOMER AND ALOS THE ELASTOMER OF THE LATEX WHICH REMAINS UNCOAGULATED FOLLOWING STEP (A), THE DISSOLVED ELASTOMER BEING CCOAGULATED IN THE PRESENCE OF COAGULATED LATEX ELASTOMER PRODUCED DURING STEP (A), AND THUS AGGLUTINATING THE TWO ELASTOMERS.
Claim 2
Dependent Claim
166 words
IN A PROCESS FOR PRODUCING A HOMOGENOUS BLEND OF ELASTOMERS BY MIXING AN ELASTOMER INLATEX FORM WITH AN ELASTOMER DISSOLVED IN A WATER IMMISCIBLE ORGANIC SOLVENT TO FORM A PSEUDOEMULSION IN WHICH THE TWO ELASTOMERS ARE MIXED IN THE LIQUID PHASE AND BOTH OF THE MIXED ELASTOMERS ARE THEN COAGULATED AND AGGLUTINATED TO PROVIDE A BLEND OF THE TWO ELASTOMERS, THE IMPROVED METHOD WHICH COMPRISES THE FOLLOWING STEPS: A. MIXING A TALEX COAGULATING AGENT INTO THE AQUEOUS PHASE OF SAID PSEUDOEMULSION AND PARTIALLY COAGULATING THE ELASTOMER OF THE LATEX PRIOR TO SUBSTANTIAL VAPORIZATION OF SAID SOLVENT AND HENCE PRIOR TO COAGUALTION OF THE DISSOLVED ELASTOMER, B. INTRODUCING THE PSEUDOEMULSION FOLLOWING STEP (A) INTO A HOT WATER BATH WHICH CONTAINS A LATEX COAGULATING AGENT, VAPORIZING SAID ORGANIC SOLVENT, COAGUALTING THE DISSOLVED ELASTOMER AND ALOS THE ELASTOMER OF THE LATEX WHICH REMAINS UNCOAGULATED FOLLOWING STEP (A), THE DISSOLVED ELASTOMER BEING CCOAGULATED IN THE PRESENCE OF COAGULATED LATEX ELASTOMER PRODUCED DURING STEP (A), AND THUS AGGLUTINATING THE TWO ELASTOMERS.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the elastomer of the latex is creamed prior to the coagulation thereof.
Claim 4
Dependent Claim
37 words
The process of claim 1 wherein a portion of said hot water bath which contains a latex coagulating agent is circulated and mixed with the pseudoemulsion before it is introduced into the main body of the bath.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the coagulating agent is sulfuric acid.
Claim 6
Dependent Claim
70 words
The process of claim 1 wherein a latex coagulating agent is added to the pseudoemulsion, the latex elastomer is partially coagulated during step (a), the resulting mixture is then diluted with a hot aqueous solution of the latex coagulating agent, organic solvent is vaporized from the dissolved elastomer, the dissolved elastomer is coagulated accompanied by further coagulation of the elastomer of the latex, and the two elastomers are thus agglutinated.
Claim 7
Dependent Claim
25 words
The process of claim 1 wherein a rubber pigment is incorporated in the pseudoemulsion and is bound within the coagulum upon agglutination of the elastomers.
Claim 8
Dependent Claim
12 words
The process of claim 6 wherein the rubber pigment is carbon black.
Claim 9
Dependent Claim
26 words
The process of claim 1 wherein a rubber compounding oil is incorporated in the pseudoemulsion and is bound within the coagulum upon agglutination of the elastomers.
Claim 10
Dependent Claim
19 words
The process of claim 1 wherein the elastomer in the form of a latex is a styrene-butadiene copolymer rubber.
Claim 11
Dependent Claim
17 words
The process of claim 1 wherein the elastomer dissolved in an organic solvent is a stereo-specific rubber.
References Cited (Backward Citations)
US3491052A
Cited
US3304281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |