C - Chemistry – Metallurgy – 09 – C
Patent
C - Chemistry, Metallurgy
09
C
C09C 3/10 (2006.01) C08K 3/34 (2006.01)
Patent
CA 2562667
The invention relates to the preparation of a divided solid composition comprising a talcum powder of which at least one fraction consists of grains of talc which are bonded to each other in the form of aggregates having a greater average size than that of the grains of talc. The inventive composition shows good compatibility with a large number of thermoplastic resins and a high talc content, at least of the order of 75 %. In addition, a divided solid composition obtained in accordance with the invention, can be dispersed as fine particles of talc in thermoplastic materials during the forming of said thermoplastic materials (low shear methods such as sheet/film extrusion, injection moulding, etc.) using traditional facilities and techniques. In this way, the invention can be used to produce talc-loaded thermoplastic articles without the need for costly composites (or compounds).
L'invention concerne la préparation d'une composition solide divisée comprenant une poudre de talc dont au moins une fraction consiste en des grains de talc liés entre eux sous forme d'agrégats de dimension moyenne supérieure à celle desdits grains de talc. Outre le fait de présenter une bonne compatibilité avec un grand nombre de résines thermoplastiques et une forte teneur en talc, au moins de l'ordre de 75 %, une composition solide divisée obtenue selon l'invention peut être dispersée en fines particules de talc dans des matières thermoplastiques au cours de la mise en forme de ces matières thermoplastiques (procédés à faible cisaillement tels que moulage par injection, extrusion de feuilles/films, ...) selon les techniques et installations traditionnelles. L'invention permet ainsi de réaliser des articles thermoplastiques chargés en talc sans avoir recours à de coûteux composites (ou compounds).
Jouffret Frederic
Saint-Gerard Yannick
Mcfadden Fincham
Talc de Luzenac
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