Process for modulating the curing exotherm of thermosetting highvinylpolybutadiene
Abstract
Abstract THE PROCESS DISCLOSED HEREIN COMPRISES THE CURING OF A THERMOSETTING HIGH-VINYL POLYBUTADIENE POLYMER WHILE IN INTIMATE ADMIXTURE WITH 1-30% OF A HYDROCARBON OIL HAVING A SUBSTANTIAL PORTION OF ALIPHATIC HYDROCARBON THEREIN. IT IS FOUND THAT SUCH THERMOSETTING POLYMERS WHEN CURED WITH FREE RADICAL GENERATING CATALYSTS SUCH AS PEROXY COMPOUNDS WILL GENERATE AN EXOTHERM WHICH VERY OFTEN CAUSES CRAZING, CRACKING AND BUBBLE FORMATION IN THE CASTING. THE LARGER THE CASTING THE MORE LIKELIHOOD THERE S FOR SUCH DEFECTS TO OCCUR. THE PRESENCE OF THE OIL DURING THE CURING MODULATES THE EXOTHERM TO A LOWER TEMPERATURE, THEREBY REDUCING THE POSSIBILITIES FOR FORMATION OF CRACKS, CRAZING AND BUBBLE FORMATION THAT GENERALLY OTHERWISE OCCUR. THIS MAKES T POSSIBLE TO MAKE A POURABLE RESIN COMPOSITION AS AN ENCAPSULATING MATERIAL THAT CAN BE CURED IN SUBSTANTIAL VOLUME WITHOUT THE FORMATION OF CRACKS, CRAZING AND BUBBLES.
Inventors
- 👤 D Tompkins
Bibliographic Details
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