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Title: Higher modulus compositions incorporating particulate rubber

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.
Inventors:
 [1];  [2];  [3];  [4]
  1. (Allentown, PA)
  2. (Louisville, KY)
  3. (Emmaus, PA)
  4. (Souderton, PA)
Issue Date:
OSTI Identifier:
869709
Assignee:
Composite Particles, Inc. (Allentown, PA) OSTI
Patent Number(s):
US 5382635
Contract Number:
AC07-88ID12695
Research Org:
AIR PRODUCTS & CHEMICALS INC
Country of Publication:
United States
Language:
English
Subject:
modulus; compositions; incorporating; particulate; rubber; particles; fillers; extenders; various; composite; polymer; systems; chlorinated; gas-solid; phase; reaction; chlorine-containing; gas; containing; exhibits; flexural; prepared; unchlorinated; filler; extender; chlorination; carried; contacting; finely; divided; comprising; volume; percent; chlorine; advantageously; diluted; air; nitrogen; essentially; inert; gases; contain; minor; amounts; fluorine; improved; performance; obtained; dilution; result; unchlorinated rubber; chlorinated rubber; inert gases; essentially inert; compositions incorporating; flexural modulus; rubber particles; minor amounts; improved performance; volume percent; inert gas; finely divided; containing gas; solid phase; minor amount; gas comprising; polymer composite; polymer containing; phase reaction; composite polymer; chlorine-containing gas; chlorine gas; rubber fillers; nitrogen dilution; modulus result; rubber filler; various composite; percent chlorine; air dilution; particulate rubber; modulus compositions; incorporating particulate; composite systems; polymer systems; divided rubber; gas-solid phase; extenders exhibits; contain minor; improved polymer; /525/521/