Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1981-12-21
1983-07-19
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
260800, 524101, 524151, 525236, 5263402, C08K 534, C08K 552
Patent
active
043944728
ABSTRACT:
A stabilized polyisoprene composition comprising 100 parts by weight of polyisoprene and 0.15-3.0 parts by weight of a binary system antioxidant consisting of 50-99% by weight of a phosphite type antioxidant represented by the formula, ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 are same or different aryl groups, and 50-1% by weight of a triazine derivative type antioxidant represented by the formula, ##STR2## wherein X.sub.1, X.sub.2, and X.sub.3, which may be the same or different, are selected from the group consisting of --NH--, --O--, and --S--, and R', R", and R"', which may be the same or different, represent alkyl, or alkyl-substituted or unsubstituted hydroxyphenyl groups. This binary system antioxidant exhibits a synergistic effect on the stabilization of polyisoprene against heat and oxygen.
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Arao Toshio
Harada Hiroshi
Ito Tadahiko
Satoh Nobuo
Japan Synthetic Rubber Co. Ltd.
Kight III John
White R. A.
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