Vulcanizable rubber compositions inhibited from premature vulcanization by methylene thioethers, and novel methylene thioethers
申请人:MONSANTO COMPANY
公开号:EP0029719A1
公开(公告)日:1981-06-03
Sulfur-vulcanizable rubber compositions containing sulfur-vulcanizing agent and organic vulcanization accelerating agent are inhibited from premature vulcanization by activated methylene di (thioethers) ofthe formula
in which R is alkyl of 1-20 carbon atoms, cycloalkyl of 5-12 carbon atoms, benzyl, a-methylbenzyl, phenyl, or substituted phenyl wherein the substituents are lower alkyl, lower alkoxy, or halo, R is R or anilino or substituted anilino wherein the substituents are lower alkyl, lower alkoxy or halo, and R2 is phenyl or substituted phenyl as above;
in which R is the same as above and X is o-phenylene or straight or branched alkylene of 2-4 chain carbon atoms;
in which R is the same as above, R3 is lower alkyl or lower alkoxy, and R4 is carboalkoxy of 1-5 carbon atoms orSR
in which R is the same as above and R, is carboalkoxy of 1-5 carbon atoms, substituted carbamoyl of the formula
in which R6 is hydrogen or R, R, is R or carboalkoxy of 1-5 carbon atoms, or R6 and R7 together is alkylene or oxydialkylene of 4-8 carbon atoms which along with the nitrogen atom forms a heterocycle.
Methylene di (thioethers) having the above formulae are novel compounds.
There may also be used in the vulcanizable compositions methylene di (thioethers) in which R5 is cyano; and, provided the organic accelerating agent is 2-mercaptobenzothiazole, methylene di (thioethers) in which R4 is lower alkyl or R3 is carbamoyl.
含有硫磺硫化剂和有机硫化促进剂的可硫化橡胶组合物通过活化的亚甲基二(硫醚)来抑制过早硫化,其式为
其中 R 为 1-20 个碳原子的烷基、5-12 个碳原子的环烷基、苄基、a-甲基苄基、苯基或取代苯基(其中取代基为低级烷基、低级烷氧基或卤基),R 为 R 或苯胺基或取代苯胺基(其中取代基为低级烷基、低级烷氧基或卤基),R2 为苯基或取代苯基,如上所示;
其中 R 同上,X 为邻苯基或 2-4 链碳原子的直链或支链亚烷基;
其中 R 同上,R3 为低级烷基或低级烷氧基,R4 为 1-5 个碳原子的羧基烷氧基或 SR
其中 R 同上,R 是 1-5 个碳原子的羧基烷氧基,式中的取代氨基甲酰基
其中 R6 是氢或 R,R, 是 R 或 1-5 个碳原子的羧基烷氧基,或 R6 和 R7 合在一起是 4-8 个碳原子的亚烷基或氧基二烷基,与氮原子一起形成杂环。
具有上述分子式的亚甲基二(硫醚)是新型化合物。
在可硫化组合物中还可使用 R5 为氰基的亚甲基二硫代硫醚;以及 R4 为低级烷基或 R3 为氨基甲酰基的亚甲基二硫代硫醚(如果有机促进剂为 2-巯基苯并噻唑)。