Claims
- 1. A rubber vulcanization composition comprising:
- (a) from about 2 to about 15 weight percent of bis- (2,5-polythio-1,3,4-thiadiazole) consisting of the formula: ##STR10## wherein the sum of x and y is from 1 to 16 and x and y are independently selected from 0 and integers of from 1 to 8;
- (b) from about 15 to about 50 weight percent of a bismaleimide compound of the general formula: ##STR11## wherein R is divalent and is selected from the group consisting of acyclic aliphatic groups having from about 2 to 16 carbon atoms, cyclic aliphatic groups having from about 5 to 20 carbon atom, aromatic group having from about 6 to 18 carbon atoms, and alkylaromatic groups having from about 7 to 24 carbon atoms and wherein these divalent groups may contain a hetero atom selected from 0, N and S;
- (c) from about 15 to about 45 weight percent of a sulfenamide compound of the general formula: ##STR12## wherein R.sup.1 is selected from the group consisting of hydrogen, acyclic aliphatic groups having from about 1 to 10 carbon atoms, and cyclic aliphatic groups having from about 5 to 10 carbon atoms; and R.sup.2 is selected from the group consisting of cyclic aliphatic groups having from about 5 to 10 carbon atoms and mercaptobenzothiazolyl groups of the formula: ##STR13## and (d) from about 20 to about 55 weight percent of sulfur, a sulfur donor and mixtures thereof.
- 2. The rubber vulcanization composition of claim 1 wherein (a) from about 2.5 to 12.5 weight percent is bis- (2,5-polythio-1,3,4-thiadiazole); (b) from about 20 to 36 weight percent is a bismaleimide compound; (c) from about 17 to 42 weight percent is a sulfenamide compound; and (d) from about 23 to 43 weight percent is sulfur, a sulfur donor, and mixtures thereof.
- 3. The rubber vulcanization system of claim 1 wherein x and y are both an integer of from 2 to 4.
- 4. The rubber vulcanization system of claim 1 wherein x and y are 2.
- 5. The rubber vulcanization system of claim 1 wherein the molecular weight of said bis-(2,5-polythio-1,3,4-thiadiazole) ranges from about 328 to about 808.
- 6. The rubber vulcanization system of claim 1 wherein the molecular weight ranges from about 424 to 552.
- 7. The rubber vulcanization system of claim 1 wherein said bismaleimide is selected from the group consisting of N,N'-ethylenebismaleimide, N,N'-hexamethylenebismaleimide, N,N'-(m-phenylene)bismaleimide, N,N'-(p-phenylene)bismaleimide, N,N'-(p-tolylene)bismaleimide, N,N'-(methylenedi-p-phenylene)-bismaleimide, N,N'-(oxydi-p-phenylene)bismaleimide, .alpha.,.alpha.-bis-(4-p-phenylene)bismaleimide, and .alpha.,.alpha.-bis-(4-maleimidophenyl)-meta-diisopropylbenzene.
- 8. The rubber vulcanization system of claim 1 wherein said sulfenamide compound is selected from the group consisting of N-cyclohexyl-2-benzothiazylsulfenamide, N-isopropyl-2-benzothiazylsulfenamide, N-t-butyl-2-benzothiazyl-sulfenamide, N-t-butyl bis-(2-benzothiazylsulfen)amide, and N,N-dicyclohexyl-2-benzothiazylsulfenamide.
- 9. The rubber vulcanization system of claim 1 wherein said sulfur and sulfur donor are selected from the group consisting of elemental sulfur, an amide disulfide, polymeric polysulfide and sulfur olefin adducts.
Parent Case Info
This is a divisional of U.S. patent application Ser. No. 07/935,699, filed on Aug. 26, 1992, now issued as U.S. Pat. No. 5,262,488.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1235026 |
Jun 1971 |
GBX |
Non-Patent Literature Citations (4)
Entry |
A. S. Prashchikina, et al, Kauchuk i Rezina, No. 7, (1979), p. 14. |
Abstract for JP 030565544. |
Abstract for the IRC--85 Kyoto; International Rubber Conference proceedings in Kyoto, Japan, Oct. 15-18, 1985, Paper 18J01, pp. 875-880. |
Jablonowski, T. L., "TBzTD and CBBS--Alternative Accelerators for Reducing Nitrosamine Generation", Rubber World, (1992), pp. 18-22. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
935699 |
Aug 1992 |
|