NON-STAINING ANTIDEGRADANTS FOR VULCANIZED ELASTOMERS

摘要

The instant invention discloses a process for preventing contact discoloration of substrates coming into contact with elastomers and stabilizing elastomers to prevent oxidative, thermal, dynamic, light-induced and/or ozone-induced degradation, which comprises incorporating into the elastomers, or applying to these, at least a compound of the formula (I) wherein R₁ is C₁-C₁₂alkyl, R₂ is C₁-C₁₂alkyl, or R₁ and R₂ together with the carbon atom to which they are attached form an unsubstituted or with C₁-C₄alkyl substituted C₅-C₁₂cycloalkyl ring; R₃ is hydrogen or -CH₂-S(O)_m-R₅, R₄ and R₅ independently of each other are unsubstituted or with cyano substituted C₅-C₁₈- alkyl; C₇-C₉phenylalkyl, unsubstituted or with halogen, hydroxyl, cyano or C₁-C₄alkyl substi- tuted phenyl or naphthyl; benzothiazolyl or -R₆-CO₂-R₇, R₆ is C₁-C₁₈alkylene, R₇ is C₁-C₁₈alkyl, and m is 0, 1 or 2. The instant invention discloses also novel compounds of the formula (I), new mixtures of compounds of the formula (I) and compositions thereof in elastomers.