US4118367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced rubber
Assignee: Malaysian Rubber Producers Research Association
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Filing: 1977-01-27
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Granted: 1978-10-03
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Expires: 1997-01-27
Abstract
Abstract The invention relates to the production of silica reinforced rubber incorporating a novel azo-silane coupling agent which does not depend on the vulcanization reaction to effect coupling to the rubber. The novel coupling agents are of the general formula:
Inventors
- 👤 Keith Dawes
- 👤 Roger James Rowley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:38
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804; C08K5/544; C08K5/5455; Y; Y10; Y10S; Y10S524/00; Y10S524/925
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
114 words
A method of compounding rubber with silica which comprises including in the rubber a compound of the formula: Y -- X -- CO -- N = N -- CO -- X.sup.1 -- Z where X and X 1 are the same or different and each is an imino group, an oxygen atom or a substituted or unsubstituted methylene group; Y is a substituted or unsubstituted alkyl aryl or aralkyl group, or is the same as Z; and Z is an alkyl, aryl or aralkyl group which has as substituent at least one silane group of the formula: ---Si(OR) 3 or --OSi(OR 3 ) in which R is a straight or branched chain alkyl group.
Claim 2
Independent Claim
114 words
A method of compounding rubber with silica which comprises including in the rubber a compound of the formula: Y -- X -- CO -- N = N -- CO -- X.sup.1 -- Z where X and X 1 are the same or different and each is an imino group, an oxygen atom or a substituted or unsubstituted methylene group; Y is a substituted or unsubstituted alkyl aryl or aralkyl group, or is the same as Z; and Z is an alkyl, aryl or aralkyl group which has as substituent at least one silane group of the formula: ---Si(OR) 3 or --OSi(OR 3 ) in which R is a straight or branched chain alkyl group.
Claim 3
Dependent Claim
18 words
A method as claimed in claim 1 wherein R is a C 1 to C 6 alkyl group.
Claim 4
Dependent Claim
61 words
A method as claimed in claim 1 wherein said compound is of the formulae: ##STR4## or R 1 .O.CO.N:N.CO.NH(CH 2 ) m .Si(OR 2 ) 3 where R 1 and R 2 are the same or different and each is a straight or branched chain alkyl group; m is 0, 1, 2 or 3; and n is 1, 2 or 3.
Claim 5
Dependent Claim
21 words
A method as claimed in claim 3 wherein R 1 and R 2 are C 1 to C 6 alkyl groups.
Claim 6
Dependent Claim
27 words
A method as claimed in claim 1 wherein the rubber is treated by adding the compound to the rubber prior to compounding the treated rubber with silica.
Claim 7
Dependent Claim
20 words
A method as claimed in claim 5 wherein the rubber is in the form of solid rubber or rubber solution.
Claim 8
Dependent Claim
22 words
A method as claimed in claim 1 comprising compounding silica into rubber and mixing into the rubber or compounded rubber said compound.
Claim 9
Dependent Claim
28 words
A method as claimed in claim 6 wherein subsequent to the inclusion of the compound the rubber is heated to complete reaction between the rubber and the compound.
Claim 10
Dependent Claim
53 words
A method as claimed in claim 8 wherein the compound has the formula: ##STR5## wherein R 1 , R 2 are the same or different and each is a straight or branched chain alkyl group; and m is 0, 1, 2 or 3, and the temperature during heating does not exceed 100° C.
Claim 11
Dependent Claim
53 words
A method as claimed in claim 8 wherein the compound has the formula: R.sup.1.O.CO.N:N.CO.NH.(CH.sub.2).sub.n.Si(OR.sup.2).sub.3 where R 1 , R 2 are the same or different and each is a straight or branched chain alkyl group; and m is 1, 2 or 3 and the temperature during the heating does not exceed 150° C.
Claim 12
Dependent Claim
19 words
A method as claimed in claim 6 wherein the amount of the compound is from 0.1 to 10 pphr.
Claim 13
Dependent Claim
20 words
A method as claimed in claim 6 wherein the amount of the compound is from 0.2 to 20 pph silica.
Claim 14
Dependent Claim
12 words
Rubber compounded with silica and a compound as defined in claim 6.
Claim 15
Dependent Claim
32 words
Rubber compounded with silica as claimed in claim 13 and including at least one member selected from the group consisting of fillers other than silica, activators, accellerators, vulcanizing agents, antioxidants and antiozonants.
Claim 16
Dependent Claim
17 words
A silica reinforced rubber vulcanizate made by vulcanizing rubber compounded with silica as claimed in claim 13.
References Cited (Backward Citations)
US3778430A
Cited
US3768537A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-02 | 1982-04-03 | 1982-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-02 | 1986-04-03 | 1986-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-02 | 1990-04-03 | 1990-10-03 | $7700.00 | Window Closed / Lapsed |