Rubber compositions comprising sulfenimide accelerators

Details Rubber compositions comprising sulfenimide accelerators Rubber compositions comprising sulfenimide accelerators

1989-09-05

1992-01-07

Shah, Mukund J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525348, 526220, 546153, 546171, 546293, C08L 700, C08L 900, C07D21536, C07D21371

Patent

active

050793055

ABSTRACT:
Heterocyclic thiol sulfenimide compounds are useful as an accelerator in the curing of natural and/or synthetic rubbers. The compound can be represented by the formula ##STR1## wherein each of A.sup.1 and R.sup.2, independently, is at least one heterocyclic ring containing one or more nitrogen atoms therein, or at least one heterocyclic ring containing one or more nitrogen atoms therein and (1) one or more hydrocarbyl substituents, or (2) one or more electron withdrawing groups, or (3) one or more electron releasing groups, wherein A.sup.1 alternatively is thiazyl or a dithiocarbamoyl, and wherein R is a (a) hydrogen atom, or (b) a hydrocarbyl radical haaving from 1 to 16 carbon atoms, or (c) the hydrocarbon radical of (b) wherein one or more of the carbon atoms is an oxygen atom, a nitrogen atom, or a substituted nitrogen atom wherein said substituted group is an alkyl and in combination with said nitrogen atom forms a heterocyclic ring having a total of from 1 to 7 carbon atoms, or (d) the hydrocarbyl radical of (b) containing a halogen, an amino, a cyano, an alkoxy, a hydroxy, or an alkoxycarbonyl. When the heterocyclic thiol sulfenimide compound is utilized as an accelerator for rubber, improved cure rates, longer scorch delay, and better reversion resistance are obtained in comparison to conventional sulfenamides.

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Article "Preparing N-Alkyl- and N-Cycloalkylbis-(2-Benzothiazolesulfen)Amides" United States Rubber Co., Naugatuck Chemical Division, Naugatuck, Conn.

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