Patent US3872036A successfully refreshed from Google Patents.
US3872036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of rubber composition
Assignee: Japanese Geon Co Ltd
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Filing: 1971-03-10
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Granted: 1975-03-18
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Expires: 1991-03-10
Abstract
Abstract A process for the preparation of a carbon black-containing rubber composition having improved green strength the rubber components of which consist of 80 - 40 percent by weight of butadiene-acrylonitrile copolymer rubber (A) and 20 - 60 percent by weight of isoprene-acrylonitrile copolymer rubber (B) or a carbon black-containing rubber composition the rubber components of which consist of 60 - 30 percent by weight of butadienestyrene copolymer rubber (A) and 40 - 70 percent by weight of natural rubber (B), wherein 100 parts by weight of rubber (A) are mixed with 30 - 100 parts by weight of carbon black, the mixture is milled and aged, and then it is mixed with rubber (B), and the resultant mixture is milled.
Inventors
- 👤 Yoshihiro Todani
- 👤 Nagatoshi Sugi
- 👤 Kinro Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:54
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; C08K; C08K3/00; C08K3/02; C08K3/04; C08L; C08L7/00; C08L9/00; C08L9/02; C08L9/06; C08J2321/00; C08J2409/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
131 words
IN A PROCESS FOR THE PREPARATION OF A CARBON BLACKCONTAINING RUBBER COMPOSITION WHEREIN THE RUBBER COMPONENTS OF SAID COMPOSITION CONSIST OF 80-40 PERCENT BY WEIGHT OF BUTADIENE-ACRYLONITRILE COPOLYMER RUBBER (A) AND 20-60 PERCENT BY WEIGHT OF ISOPRENE-ACRYLONITRILE COPOLYMER RUBBER (B) OR 60-30 PERCENT BY WEIGHT OF BUTADIENE-STYRENE COPOLYNER (A) AND 40-70 PERCENT BY WEIGHT OF NATURAL RUBBER (B), THE IMPROVEMENT WHEREIN A RUBBER COMPOSITION HAVING IMPROVED GREEN STRENGTH IS OBTAINED BY MIXING 100 PARTS BY WEIGHT OF SAID RUBBER (A) WITH 30-100 PARTS BY WEIGHT OF CARBON BLACK, MILLING THE RESULTING MIXTURE AND AGING THE RESULTING MIXTURE BY ALLOWING SAID MIXTURE TO STAND AT ROOM TEMPERATURE FOR A PERIOD OF AT LEAST 12 HOURS, AND THEN MIXING THE MILLED AND AGED MIXTURE WITH SAID RUBBER (B), AND MILLING THE RESULTANT MIXTURE.
Claim 2
Dependent Claim
131 words
IN A PROCESS FOR THE PREPARATION OF A CARBON BLACKCONTAINING RUBBER COMPOSITION WHEREIN THE RUBBER COMPONENTS OF SAID COMPOSITION CONSIST OF 80-40 PERCENT BY WEIGHT OF BUTADIENE-ACRYLONITRILE COPOLYMER RUBBER (A) AND 20-60 PERCENT BY WEIGHT OF ISOPRENE-ACRYLONITRILE COPOLYMER RUBBER (B) OR 60-30 PERCENT BY WEIGHT OF BUTADIENE-STYRENE COPOLYNER (A) AND 40-70 PERCENT BY WEIGHT OF NATURAL RUBBER (B), THE IMPROVEMENT WHEREIN A RUBBER COMPOSITION HAVING IMPROVED GREEN STRENGTH IS OBTAINED BY MIXING 100 PARTS BY WEIGHT OF SAID RUBBER (A) WITH 30-100 PARTS BY WEIGHT OF CARBON BLACK, MILLING THE RESULTING MIXTURE AND AGING THE RESULTING MIXTURE BY ALLOWING SAID MIXTURE TO STAND AT ROOM TEMPERATURE FOR A PERIOD OF AT LEAST 12 HOURS, AND THEN MIXING THE MILLED AND AGED MIXTURE WITH SAID RUBBER (B), AND MILLING THE RESULTANT MIXTURE.
Claim 3
Dependent Claim
149 words
In a process for the preparation of a carbon black-containing rubber composition wherein the rubber components of said composition consist of 80-40 percent by weight of butadiene-acrylonitrile copolymer rubber (A) and 20-60 percent by weight of isoprene-acrylonitrile copolymer rubber (B) or 60-30 percent by weight of butadiene-styrene copolymer rubber (A) and 40-70 percent by weight of natural rubber (B), the improvement wherein a rubber composition having improved green strength is obtained by first compounding said rubber (A) with carbn black, milling the resulting mixture and aging the resulting mixture by allowing said mixture to stand at room temperature for a period of at least 12 hours, and then mixing the resulting gelled carbon black master batch with said rubber (B) and carbon black, and milling the resultant mixture, the total amount of carbon black used being 40-150 parts by weight per 100 parts by weight of the total rubber.
Claim 4
Dependent Claim
149 words
In a process for the preparation of a carbon black-containing rubber composition wherein the rubber components of said composition consist of 80-40 percent by weight of butadiene-acrylonitrile copolymer rubber (A) and 20-60 percent by weight of isoprene-acrylonitrile copolymer rubber (B) or 60-30 percent by weight of butadiene-styrene copolymer rubber (A) and 40-70 percent by weight of natural rubber (B), the improvement wherein a rubber composition having improved green strength is obtained by first compounding said rubber (A) with carbn black, milling the resulting mixture and aging the resulting mixture by allowing said mixture to stand at room temperature for a period of at least 12 hours, and then mixing the resulting gelled carbon black master batch with said rubber (B) and carbon black, and milling the resultant mixture, the total amount of carbon black used being 40-150 parts by weight per 100 parts by weight of the total rubber.
Claim 5
Dependent Claim
158 words
In a process for the preparation of a carbon black-containing rubber composition wherein the rubber components of said composition consist of 80-40 percent by weight of butadiene-acrylonitrile copolymer rubber (A) and 20-60 PERCENT by weight of isoprene-acrylonitrile copolymer rubber (B) or 60-30 percent by weight of butadiene-styrene copolymer rubber (A) and 40-70 percent by weight of natural rubber (B), the improvement wherein a rubber composition having improved green strength is obtained by first mixing a latex of said rubber (A) with a dispersion of carbon black, coagulating, drying and milling the resulting mixture and aging the resulting mixture by allowing said mixture to stand at room temperature for a period of at least 12 hours, and then mixing the resulting gelled carbon black master batch with said rubber (B) and carbon black, and milling the resultant mixture, the total amount of carbon black used being 40-150 parts by weight per 100 parts by weight of the total rubber.
Claim 6
Dependent Claim
158 words
In a process for the preparation of a carbon black-containing rubber composition wherein the rubber components of said composition consist of 80-40 percent by weight of butadiene-acrylonitrile copolymer rubber (A) and 20-60 PERCENT by weight of isoprene-acrylonitrile copolymer rubber (B) or 60-30 percent by weight of butadiene-styrene copolymer rubber (A) and 40-70 percent by weight of natural rubber (B), the improvement wherein a rubber composition having improved green strength is obtained by first mixing a latex of said rubber (A) with a dispersion of carbon black, coagulating, drying and milling the resulting mixture and aging the resulting mixture by allowing said mixture to stand at room temperature for a period of at least 12 hours, and then mixing the resulting gelled carbon black master batch with said rubber (B) and carbon black, and milling the resultant mixture, the total amount of carbon black used being 40-150 parts by weight per 100 parts by weight of the total rubber.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |