Suitable base resins for these mixtures either alone or in combination include for example, polyolefins such as homo- and co-polymers of ethylene, propylene, 4-methyl pentene-1 and butene-1, polyamides, linear polyesters such as polyethylene terephthalate and polyvinyl resins such as homo- and co-polymers of vinyl chloride and vinylidene chloride.