Selective catalytic process for controlled modification of ethyl

Details Selective catalytic process for controlled modification of ethyl Selective catalytic process for controlled modification of ethyl

1988-09-15

1990-09-11

Henderson, Christopher

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253318, C08C 1922

Patent

active

049564200

ABSTRACT:
Preparation of halothio-sulfonamide-modified terpolymers having a low degree of unsaturation is accomplished by preferably reacting N-chlorothio-sulfonamide with an ethylene-(alpha-olefin)-diene monomer terpolymer comprising, for example, 1,4- hexadiene and/or dicyclopentadiene, in the presence of a catalyst of the formula MAn, where A is an anion or mixture of anions of a weak acid, and M is a metal selected from copper, antimony, bismuth and tin and n is a number which corresponds to the oxidation state of M divided by the valence of said weak acid anion. The reaction is preferably carried out in a melt phase process. Additionally, metals such as zinc and iron can be used at low concentrations in a melt phase process or at short reaction times in a solution process. Mixtures of such modified terpolymers with highly unsaturated rubbery polymers and vulcanizates of such mixtures are particularly useful in pneumatic tire sidewalls.

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R. J. Hopper, "Improved Cocure of EPDM-Polydiene Blends by Conversion of EPDM Into Macromolecular Cure Retarder", Rubber Chemistry and Technology, vol. 49, p. 346 and Table 1.
G. A. Olah, Friedel-Crafts Chemistry, John Wiley & Sons, 1973, p. 238.
R. J. Hopper et al., Preprint, International Conference on Advances in the Stabilization and Controlled Degradation of Polymers, Ozone Resistant, Co-Curable Blends of Chemically Modified EPDM with Polydiene Elastomers, 5/84.

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