Method of treating talcum powder for incorporation into a...

C - Chemistry – Metallurgy – 08 – K

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C08K 9/08 (2006.01) B29B 9/06 (2006.01) B29B 9/08 (2006.01) B29B 15/10 (2006.01) C08J 3/12 (2006.01) C08J 3/22 (2006.01)

Patent

CA 2178336

Method of incorporation a talcum powder into a material, in particular a thermoplastic material. The method consists in (a) mixing the talcum powder with water and a polyethylene glycol, a polypropylene glycol or a copolymer of these compounds, (b) pressing the mixture through dies and sectioning it to obtain granules of an average size exceeding that of the grains of the initial powder, (c) incorporating in the material the product obtained, (d) subjecting the dispersion to mechanical action to break up the granules and to release and distribute in the mass the grains of the initial powder. The invention is characterized by incorporating small particle-sized talcum powders into materials, especially thermoplastic materials, without the practical problem involved in incorporating small particle-sized powders.

L'invention concerne un procédé pour incorporer une poudre de talc dans une matière, en particulier matière thermoplastique. Ce procédé consiste (a) à mélanger la poudre de talc avec de l'eau et un polyéthylène glycol, un polypropylène glycol ou un copolymère de ces composés, (b) à presser le mélange à travers des filières et à le tronçonner de façon à obtenir des granulés de dimension moyenne supérieure à celle des grains de la poudre initiale, (c) à incorporer dans la matière le produit obtenu, (d) et à procéder à une action mécanique de dispersion de façon à désagréger les granulés et à libérer et répartir dans la masse les grains de la poudre initiale. L'invention permet d'incorporer des poudres de talc de faible granulométrie dans des matières notamment thermoplastiques, sans conduire aux difficultés pratiques d'incorporation rencontrées avec les poudres de faible granulométrie.

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