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AssigneeComposite Particles, Inc.
InventorsEdwin L. McInnis, Bernard D. Bauman, Mark A. Williams
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Rubber particles, to be used as fillers or extenders for various composite polymer systems, are chlorinated by a gas-solid phase reaction with a chlorine-containing gas. A composite polymer containing the chlorinated rubber fillers or extenders exhibits a higher flexural modulus than if prepared using an unchlorinated rubber filler or extender. Chlorination of the rubber particles is carried out by contacting the finely divided rubber particles with a chlorine-containing gas comprising at least about 5 volume percent chlorine. Advantageously, the chlorine can be diluted with air, nitrogen or other essentially inert gases and may contain minor amounts of fluorine. Improved performance is obtained with nitrogen dilution of the chlorine gas over air dilution. Improved polymer composite systems having higher flexural modulus result from the use of the chlorinated rubber particles as fillers instead of unchlorinated rubber particles.
Particlized rubber material treated to increase its tensile and flexural modulus by contacting said particlized rubber material in a gas/solid phase reactor with a chlorine-containing gas at a temperature and chlorine gas partial pressure sufficient to increase the bulk chlorine content of the particlized rubber material to between about 0.25% and 10%.
Granulated reclaimed tire rubber treated by contacting the granulated rubber in a gas/solid phase reactor with a chlorine-containing gas a temperature and chlorine gas partial pressure sufficient to increase the bulk chlorine content of the granulated rubber to between a bulk chlorine content of from 1 to 10 weight percent.
Granulated reclaimed tire rubber having a bulk chlorine content of from 1 to 10 weight percent.
Dependencies are inferred from the claim text.