Ozone resistant blends of natural rubber/polychloroprene/epdm copolymer and a process for the preparation thereof
Abstract
Abstract THERE IS PROVIDED A VULCANIZABLE ELASTOMERIC COMPOSITION HAVING IMPROVED RESISTANCE TO OZONE AND A PROCESS FOR ITS PREPARATION. THE PROCESS CONSISTS ESSENTIALLY OF PREPARING A PREMIX BY MIXING ABOUT 15-30 PARTS BASED ON THE TOTAL WEIGHT OF RUBBERS OF A RANDOM, LINEAR ELASTOMERIC ETHYLENE/PROPYLENE/OPEN-CHAIN NON-CONIUGATED DIENE COPOLYMER HAVING A MOONEY VISCOSITY (ML-1+4/121*C.) OF ABOUT 35-75 WITH ABOUT 20-35 PARTS BASED ON THE TOTAL WEIGHT OF RUBBERS MERCAPTAN-MODIFIED SOL OF A POLYMER OF CHLOROPRENE HAVING A MOONEY VISCOSITY (ML-1+2.5/ 100*C.) OF ABOUT 50, AND ABOUT 25-60 PARTS BASED ON THE TOTAL WEIGHT OF RUBBERS OF A REINFORCING CARBON BLACK HAVING AN EM SURFACE AREA OF AT LEAST ABOUT 40 SQUARE METERS PER GRAM, AND MIXING THE PREMIX WITH ABOUT 50-60 PARTS BASED ON THE WEIGHT OF TOTAL RUBBERS OF NATURAL RUBBER.
Inventors
- 👤 Stanley William Caywood Jr
Bibliographic Details
Claims Analysis
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