Rubber articles can be exposed to a variety of degrading influences of which mechanical
stress, heat and the action of chemicals like oxygen and ozone are the most prominent. Since
there is no one antidegradant that performs equally well against all common degrading actions, it
is necessary in many cases to use mixtures of antidegradants in order to give a rubber article well balanced protection. A chemical which is known for its outstanding performance in heat- and
oxygen-protection is polymerized 2,2,4-trimethyl-l ,2-dihydroquinoline (TMQ). In this review
selected aspects of the use of TMQ in natural and synthetic rubbers are highlighted. Special
emphasis is put on heat- and oxygen-protection as well as applications of TMQ in combination
with other antidegradants.