Flame-retardant filled polypropylene compound with improved flow properties

摘要

An improved flame-retardant thermoplastic compound based upon a surface modified alumina hydrate composition containing powdered alumina hydrate, a liquid mixture of C10-C20 carboxylic acids and a solid mixture of C14-C20 carboxylic acids. A preferred solid mixture comprises stearic acid and palmitic acid. Thermoplastic compounds made with polypropylene and an alumina hydrate composition containing isostearic acid together with the solid fatty acid mixture of the invention exhibit an increased melt index and reduced molding pressure compared with polypropylene compounds made with isostearic acid coated alumina hydrate and no solid fatty acid mixture.