Butadiene resins and process for preparation

Abstract

Abstract THIS INVENTION INVOLVES A PROCESS FOR PREPARING HARD, TOUGH, HEAT-RESISTANT PLASTICS BY THE PEROXIDE CURING OF BUTADIENE POLYMERS HAVING A DILUTE SOLUTION VISCOSITY OF 0.19-0.7 AND HAVING A HIGH VINYL CONTENT AND A NARROW MOLECULAR WEIGHT DISTRIBUTION, USING A PEROXIDE WHICH GIVES FREE RADICALS OF THE STRUCTURE R2(CH3)CO, ALTHOUGH THE PEROXIDE CURING OF BUTADIENE POLYMERS GENERALLY RESULTS IN PRODUCTS HAVING ELASTOMERIC POPERTIES AND BEING SWELLABLE IN BENZENE, THE PROCESS OF THIS INVENTION PERMITS VERY RAPID CURING WITHOUT CRAZING OR CRACKING TO GIVE RIGID, HEAT-RESISTANT POLYMERS. THE BUTADIENE POLYMERS HAVE AT LEAST 40%, PREFERABLY AT LEAST 70% BY WEIGHT BUTADIENE THEREIN, ADVANTAGEOUSLY HAVING AT LEAST 80% IN THE VINYL-TYPE OF REPEATING UNITS, THE AVERAGE MOLECULAR WEIGHT BEING AT LEAST 12,500 WITH A MOLECULAR WEIGHT DISTRIBUTION SUCH THAT AT LEAST 50% AND PERFERABLEY AT LEAST 90% IS ABOVE 10,000 MOLECULAR WEIGHT AND AT LAST 95% IS ABOVE 2,000 THE PROPORTION OF PEROXIDE USED, PREFERABLY DICUMYL PEROXIDE, IS 0.5-6, PERFERABLY 1-5 PATS PER 100 PARTS OF POLYMER, AND THE CURING TEMPERATURE IS AT LEAST 250*F (120*C), PREFERABLY 300-350*F. (150-180*C.) THIS PROCESS LENDS ITSELF TO LIQUID COMPOUNDING FOR THE INCORPORATION OF THE PEROXIDE AND ANY MODIFIERS, AND FOR MIXTURE WITH FILLER.

Inventors

• 👤 S Boutsicaris
• 👤 R Hayes

Bibliographic Details