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
1992-02-20
1993-07-13
Michl, Paul R.
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, 525 99, 525316, C08J 510, C08K 334, C08L 1900
Patent
active
052274250
ABSTRACT:
A sulfur-vulcanizable rubber composition obtained by thermomechanical worg of a conjugated diene compound and an aromatic vinyl compound prepared by solution polymerization in a hydrocarbon solvent having a total content of aromatic vinyl compound of between 5% and 50% and a glass transition temperature (Tg) of between 0.degree. C. and -80.degree. C. with 30 to 150 parts by weight per 100 parts by weight of elastomer of a silica having a BET surface area of between 100 and 250 m.sup.2 /g, a CTAB surface area of between 100 and 250 m.sup.2 /g, an oil absorption measured in DBP of between 150 and 250 ml/100 g, and an average projected area of the aggregates greater than 8500 nm.sup.2 before use and between 7000 and 8400 nm.sup.2 after thermomechanical mixing as well as the additives conventionally employed, with the exception of the sulfur vulcanization system, comprising at least one heat step reaching a temperature of between 130.degree. C. and 180.degree. C. for a suitable period of time of between 10 seconds and 20 minutes which is a function of the temperature selected in order to carry out the mechanical work and of the nature and volume of the components subjected to the mechanical work, followed by a finishing step consisting of the incorporating of the vulcanization system by mechanical work at a temperature below the vulcanization temperature.
REFERENCES:
patent: 3867326 (1975-02-01), Rivin et al.
patent: 4590052 (1986-05-01), Chevallier et al.
patent: 5036138 (1991-07-01), Stamhuis et al.
Compagnie Generale des Etablissements Michelin--Michelin & Cie
Michl Paul R.
Rajguru U. K.
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