Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1986-04-10
1987-05-12
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524571, C08K 509
Patent
active
046651195
ABSTRACT:
A rubber composition in which a metal salt between a resin acid and cobalt is blended in a content of from 0.05 to 0.7 part by weight in terms of the content of a metal element with respect to 100 parts by weight of rubber containing not less than 70% by weight of at least one rubber of natural rubber and a synthetic polyisoprene rubber; as the metal salt is used a cobalt resinate which has a melting point in a range of 140.degree. to 180.degree. C., an oxidation degree of not more than 60% in a gas chromatography (GLC), and not more than 2,000 ppm of a sulfur concentration in the metal salt; when the metal salt is divided into a dissolved portion and an undissolved portion by using toluene and water, the undissolved portion in both toluene and water has a characteristic absorption of around 3,600 cm.sup.-1 in an infrared absorption spectrum (IR); and when elevated in temperature at a rate of 5.degree. C./min. in a differential scanning calorimeter (DSC), the cobalt resinate has endothermic peaks in ranges of 250.degree. to 350.degree. C. and 300.degree. to 420.degree. C., respectively.
REFERENCES:
patent: 3903026 (1975-09-01), Fujimura et al.
patent: 4258770 (1981-03-01), Davis et al.
patent: 4435477 (1984-03-01), Davis
patent: 4518733 (1985-05-01), Ishikawa et al.
Hirata Yasushi
Kondo Hitoshi
Kono Masanao
Sanada Yasuyoshi
Bridgestone Corporation
Harima Chemicals Inc.
Sarofim N.
Schofer Joseph L.
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