US4410656A
Expired / Lapsed
US
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Method for rubber treatment
Assignee: Flexsys America LP
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Filing: 1982-05-03
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Granted: 1983-10-18
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Expires: 2002-05-03
Abstract
Abstract The method of masticating diene rubber in the presence of maleic acid or maleic anhydride together with sulfur or an organic sulfur compound capable of generating a thiyl radical is shown. Improved tack, green strength or both are realized in the treated diene rubber.
Inventors
- 👤 Aubert Y. Coran
- 👤 Charles P. Rader
- 👤 Chester D. Trivette, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:34
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/28
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
102 words
The method of improving the properties of diene rubber comprising masticating solid diene rubber, in the presence of a modification promoting amount of (A) sulfur or an organic sulfur compound capable of generating thiyl radicals, with (B) maleic acid or anhydride at an appropriate temperature above 130° C. for a time sufficient to increase the green strength or tack of the diene rubber but insufficient to decrease its tack, wherein the time is from 0.1 to 20 minutes and (A) and (B) are present in amounts of from 0.01-15 and 0.1-20 parts by weight, respectively, per 100 parts diene rubber by weight.
Claim 2
Independent Claim
102 words
The method of improving the properties of diene rubber comprising masticating solid diene rubber, in the presence of a modification promoting amount of (A) sulfur or an organic sulfur compound capable of generating thiyl radicals, with (B) maleic acid or anhydride at an appropriate temperature above 130° C. for a time sufficient to increase the green strength or tack of the diene rubber but insufficient to decrease its tack, wherein the time is from 0.1 to 20 minutes and (A) and (B) are present in amounts of from 0.01-15 and 0.1-20 parts by weight, respectively, per 100 parts diene rubber by weight.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the diene rubber is masticated for a time sufficient to increase both its green strength and its tack.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the mastication temperature is at least 150° C.
Claim 5
Dependent Claim
11 words
The method of claim 3 wherein the diene rubber comprises polyisoprene.
Claim 6
Dependent Claim
9 words
The method of claim 4 wherein (A) is sulfur.
Claim 7
Dependent Claim
17 words
The method of claim 4 wherein (A) is an organic sulfur compound capable of generating thiyl radicals.
Claim 8
Dependent Claim
132 words
The method of claim 6 wherein (A) is selected from polymeric polysulfides and compounds of the formula (R 1 S x ) y R 2 , wherein x is an integer of 1-5, y is an integer of from 1-4, R 2 is a radical selected from aliphatic hydrocarbon radicals of 3-18 carbon atoms optionally containing one or more ether or ester linkages and optionally substituted by one or more nitro, amino or carboxyl groups; cycloalkyl of 3-10 carbon atoms; benzyl or phenyl optionally ring-substituted by one or more nitro, amino, carboxyl, or 1-5 carbon-atom alkyl groups; or benzothiazyl, dialkylthiocarbamoyl; alkylamino of 4-12 carbon atoms; morpholino; or dialkylthiophosphoryl; R 2 having a valence of y; and R 1 is hydrogen or a radical selected from the same group as R 2 .
Claim 9
Dependent Claim
16 words
The method of claim 7 wherein (A) is an aliphatic mercaptan of from 3-18 carbon atoms.
Claim 10
Dependent Claim
11 words
The method of claim 7 wherein (A) is a phenyl mercaptan.
Claim 11
Dependent Claim
9 words
The method of claim 7 wherein (A) is 2,2'-dithiobisbenzothiazole.
Claim 12
Dependent Claim
9 words
The method of claim 7 wherein (A) is 2-mercaptobenzothiazole.
Claim 13
Dependent Claim
10 words
The method of claim 4 wherein (B) is maleic acid.
Claim 14
Dependent Claim
10 words
The method of claim 4 wherein carbon black is present.
Claim 15
Dependent Claim
46 words
The method of claim 4 wherein the mastication time is from 0.5 to 15 minutes, the temperature is at least 160° C. and (A) and (B) are present in amounts of from 0.02-4 and 0.2-8 parts by weight, respectively, per 100 parts diene rubber by weight.
Claim 16
Dependent Claim
11 words
The method of claim 14 wherein the diene rubber comprises polyisoprene.
Claim 17
Dependent Claim
12 words
The method of claim 14 wherein the diene rubber comprises natural rubber.
Claim 18
Dependent Claim
14 words
The method of claim 14 wherein the diene rubber includes polybutadiene or styrene/butadiene rubber.
Claim 19
Dependent Claim
9 words
The method of claim 15 wherein (A) is 2,2'-dithiobisbenzothiazole.
Claim 20
Dependent Claim
10 words
The method of claim 18 wherein (B) is maleic acid.
Claim 21
Dependent Claim
44 words
The method of claim 1 wherein the time is from 1-10 minutes, the temperature is from 160° to 210° C., and (A) and (B) are present in amounts of from 0.05-0.25 and 0.25-5 parts by weight, respectively, per 100 parts diene rubber by weight.
Claim 22
Dependent Claim
11 words
The method of claim 20 wherein the diene rubber comprises cis-1,4-polyisoprene.
Claim 23
Dependent Claim
9 words
The method of claim 21 wherein (A) is sulfur.
Claim 24
Dependent Claim
17 words
The method of claim 21 wherein (A) is an organic sulfur compound capable of generating thiyl radicals.
Claim 25
Dependent Claim
132 words
The method of claim 21 wherein (A) is selected from polymeric polysulfides and compounds of the formula (R 1 S x ) y R 2 , wherein x is an integer of 1-5, y is an integer of from 1-4, R 2 is a radical selected from aliphatic hydrocarbon radicals of 3-18 carbon atoms optionally containing one or more ether or ester linkages and optionally substituted by one or more nitro, amino or carboxyl groups; cycloalkyl of 3-10 carbon atoms; benzyl or phenyl optionally ring-substituted by one or more nitro, amino, carboxyl, or 1-5 carbon-atom alkyl groups; or benzothiazyl; dialkylthiocarbamoyl; alkylamino of 4-12 carbon atoms; morpholino; or dialkylthiophosphoroyl; R 2 having a valence of y; and R 1 is hydrogen or a radical selected from the same group as R 2 .
Claim 26
Dependent Claim
16 words
The method of claim 24 wherein (A) is an aliphatic mercaptan of from 3-18 carbon atoms.
Claim 27
Dependent Claim
11 words
The method of claim 24 wherein (A) is a phenyl mercaptan.
Claim 28
Dependent Claim
9 words
The method of claim 24 wherein (A) is 2-mercaptobenzothiazole.
Claim 29
Dependent Claim
9 words
The method of claim 24 wherein (A) is 2,2'-dithiobisbenzothiazole.
Claim 30
Dependent Claim
10 words
The method of claim 21 wherein (B) is maleic acid.
Claim 31
Dependent Claim
26 words
The method of claim 20 wherein the diene rubber includes polybutadiene or styrene/butadiene rubber, (A) is 2,2'-dithiobisbenzothiazole, (B) is maleic acid, and carbon black is present.
Claim 32
Dependent Claim
27 words
The method of claim 20 wherein the diene rubber includes polybutadiene or styrene/butadiene rubber, (A) is 2,2'-dithiobisbenzothiazole, (B) is maleic acid, and a non-black filler is present.
Claim 33
Dependent Claim
18 words
The method of claim 31 wherein the non-black filler is selected from clay, talc, calcium carbonate and silica.
Claim 34
Dependent Claim
12 words
The method of claim 20 wherein the diene rubber comprises natural rubber.
Claim 35
Dependent Claim
26 words
The method of claim 20 and the additional step of incorporating from 10 to 100 parts by weight of diene rubber not present during the treatment.
Claim 36
Dependent Claim
8 words
The product of the method of claim 1.
Claim 37
Dependent Claim
8 words
The product of the method of claim 11.
Claim 38
Dependent Claim
8 words
The product of the method of claim 19.
Claim 39
Dependent Claim
8 words
The product of the method of claim 28.
Claim 40
Dependent Claim
8 words
The product of the method of claim 33.
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) | 1986-10-17 | 1987-04-18 | 1987-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-17 | 1991-04-18 | 1991-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-17 | 1995-04-18 | 1995-10-18 | $7700.00 | Window Closed / Lapsed |