Beneficiated talcs

Details Beneficiated talcs Beneficiated talcs

1987-07-08

1989-03-21

Schofer, Joseph L.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

424 69, 524451, 524377, 524385, 427221, 523205, C04B 1400

Patent

active

048140198

ABSTRACT:
Means are disclosed for rendering talcs such as Chinese talcs, Australian talcs, Italian talcs or like talcs which, when ground to an approximately 2.5-5.0 .mu.m median particle size, exhibit a wet powder brightness of at least about 30% and which have hitherto been considered acceptable as fillers for thermoplastic resinous compositions, and particularly polypropylene molding resins, even suitable for this use. Such talcs are beneficiated in accordance with this invention, generally at low cost, to further enhance brightness, heat stability or both these properties in thermoplastic molded articles filled with these beneficiated acceptable talcs, while also improving or at least not unacceptably diminishing other significant physical properties, particularly tensile properties, of the resulting molded article. This is accomplished by admixing the Chinese, Australian or Italian talc, or the like, with an effective amount of a combination of:

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