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US3869435A
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Method for cross-linking rubber
Assignee: Monsanto Co
•
Filing: 1971-11-19
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Granted: 1975-03-04
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Expires: 1991-11-19
Abstract
Abstract Rubber is cross-linked by heating with compounds of the formula (Acc-SSx)nR wherein Acc-S- is an accelerating moiety, R is an organic bridging group and n is two or more. If it is postulated that cross-link formation results from direct reaction of accelerator polysulfide intermediates via a concerted mechanism and that there is ultimately formed from reaction of accelerator and sulfur a polysulfide, Acc-SSx-S-Acc, the simplest cross-linking reaction involves formation of rubber intermediate combining the accelerator moiety followed by formation of sulfur cross-linked rubber and regeneration of the accelerator moiety. Consistent with these postulations, crosslinking of rubber is described with a compound containing two Acc-SSx- groups connected through the organic bridging group R which becomes part of the cross-link.
Inventors
- 👤 Jr Chester D Trivette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:39
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/52; C07D263/54; C07D263/58; C07D235/00; C07D235/02; C07D235/04; C07D235/24; C07D235/28; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/32; C07D239/38; C07D265/00; C07D265/28; C07D265/30; C07D277/00; C07D277/60; C07D277/62; C07D277/68; C07D277/70; C07D277/76; C07D277/78; C07D285/00; C07D285/01; C07D285/02; C07D285/04; C07D295/00; C07D295/16; C07D295/20; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/16; C07F9/165; C08; C08K; C08K5/00; C08K5/36; C08K5/39
Claims Analysis
Total Claims: 52
Claim 1
Independent Claim
14 words
THE METHOD OF CROSS-LINKING WHICH COMPRISES INCORPORATING INTO DIENE RUBBER A CROSS-LINKING AMOUNT OF
Claim 2
Independent Claim
14 words
THE METHOD OF CROSS-LINKING WHICH COMPRISES INCORPORATING INTO DIENE RUBBER A CROSS-LINKING AMOUNT OF
Claim 3
Dependent Claim
4 words
radical of the formula
Claim 4
Dependent Claim
4 words
radical of the formula
Claim 5
Dependent Claim
10 words
The method of claim 1 where each Acc is different.
Claim 6
Dependent Claim
4 words
RADICAL OF THE FORMULA
Claim 7
Dependent Claim
4 words
RADICAL OF THE FORMULA
Claim 8
Dependent Claim
4 words
radical of the formula
Claim 9
Dependent Claim
4 words
radical of the formula
Claim 10
Dependent Claim
4 words
radical of the formula
Claim 11
Dependent Claim
4 words
radical of the formula
Claim 12
Dependent Claim
32 words
The method of claim 1 where x is 1, each Acc is the same, n'''' is 1-11, m is zero and Y is selected from the group consisting of -O-S- and phenylene.
Claim 13
Dependent Claim
4 words
radical of the formula
Claim 14
Dependent Claim
4 words
radical of the formula
Claim 15
Dependent Claim
4 words
RADICAL OF THE FORMULA
Claim 16
Dependent Claim
4 words
RADICAL OF THE FORMULA
Claim 17
Dependent Claim
4 words
radical of the formula
Claim 18
Dependent Claim
4 words
radical of the formula
Claim 19
Dependent Claim
4 words
RADICAL OF THE FORMULA
Claim 20
Dependent Claim
4 words
RADICAL OF THE FORMULA
Claim 21
Dependent Claim
11 words
The method of claim 1 where Z and Z'' are hydrogen.
Claim 22
Dependent Claim
4 words
radical of the formula
Claim 23
Dependent Claim
4 words
radical of the formula
Claim 24
Dependent Claim
4 words
radical of the formula
Claim 25
Dependent Claim
4 words
radical of the formula
Claim 26
Dependent Claim
18 words
The method of claim 3 where Z and Z'' are hydrogen, n'''' is 1 and Y is phenylene.
Claim 27
Dependent Claim
4 words
radical of the formula
Claim 28
Dependent Claim
4 words
radical of the formula
Claim 29
Dependent Claim
4 words
RADICAL OF THE FORMULA
Claim 30
Dependent Claim
4 words
RADICAL OF THE FORMULA
Claim 31
Dependent Claim
9 words
The method of claim 3 where Acc-S- is 2-benzothiazolylthio.
Claim 32
Dependent Claim
4 words
radical of the formula
Claim 33
Dependent Claim
4 words
radical of the formula
Claim 34
Dependent Claim
4 words
radical of the formula
Claim 35
Dependent Claim
4 words
radical of the formula
Claim 36
Dependent Claim
4 words
radical of the formula
Claim 37
Dependent Claim
4 words
radical of the formula
Claim 38
Dependent Claim
4 words
radical of the formula
Claim 39
Dependent Claim
4 words
radical of the formula
Claim 40
Dependent Claim
18 words
The method of claim 6 where Y is p-phenylene, Z and Z'' are hydrogen and n'''' is 1.
Claim 41
Dependent Claim
4 words
RADICAL OF THE FORMULA
Claim 42
Dependent Claim
4 words
RADICAL OF THE FORMULA
Claim 43
Dependent Claim
13 words
The method of claim 3 where the rubber composition also contains elemental sulfur.
Claim 44
Dependent Claim
17 words
The method of claiM 1 which comprises incorporating in addition to AccS-Sx-R-Sx-SAcc a compound of the formula
Claim 45
Dependent Claim
33 words
The method of claim 9 where X is 1, each Acc is the same, n'''' is 1-11, m is zero and Y is selected from the group consisting of -O-, -S- and phenylene.
Claim 46
Dependent Claim
9 words
The method of claim 10 where Acc-S- is 2-benzothiazolylthio.
Claim 47
Dependent Claim
18 words
The method of claim 11 where Y is p-phenylene, Z and Z'' are hydrogen and n'''' is 1.
Claim 48
Dependent Claim
16 words
The method of claim 12 where R3 and R4 are lower alkyl and n'' is 2.
Claim 49
Dependent Claim
11 words
The method of claim 13 where R3 and R4 are isopropyl.
Claim 50
Dependent Claim
63 words
A composition comprising diene rubber and a cross-linking amount of AccS-Sx-R-Sx-SAcc where AccS is the same or different accelerating moiety, x is 1, 2, 3 or 4 and R is a divalent organic radical of 1 to 24 carbon atoms of the formula -(X)n -Y-(X)n -(Y-(X)n )m where each n'''' independently is 1 to 23, m is zero, 1 or 2, X is
Claim 51
Dependent Claim
63 words
A composition comprising diene rubber and a cross-linking amount of AccS-Sx-R-Sx-SAcc where AccS is the same or different accelerating moiety, x is 1, 2, 3 or 4 and R is a divalent organic radical of 1 to 24 carbon atoms of the formula -(X)n -Y-(X)n -(Y-(X)n )m where each n'''' independently is 1 to 23, m is zero, 1 or 2, X is
Claim 52
Dependent Claim
16 words
The composition of claim 15 which contains in addition to AccS-Sx-R-Sx-SAcc a compound of the formula
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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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |