Beneficiated talcs

Abstract

Means are disclosed for rendering talcs such as Montana talc or like talcs hitherto considered incompatible or unsuitable as fillers for thermoplastic resinous compositions, and particularly polypropylene molding resins, suitable for this use. Such talcs, which in their unbeneficiated state strongly discolor the resinous matrix and affect its long-term heat stability, are beneficiated in accordance with this invention, generally at low cost, while improving or at least not unacceptably diminishing other significant physical properties, particularly yellowness index, flexural modulus and impact strength, of the resulting molded article. This is accomplished by admixing Montana talc or the like with an effective amount of a combination of: (A) one or a mixture of certain octyl- or nonylphenol/poly(ethylene oxide) condensates, and (B) one or a mixture of certain poly(ethylene glycols) or alkoxypoly(ethylene glycols).

Dependencies are inferred from the claim text.