Process for the preparation of fillers with improved bulk...

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 9/08 (2006.01) C08K 3/22 (2006.01) C08K 5/5425 (2006.01) C08L 23/08 (2006.01) C09C 1/02 (2006.01) C09C 1/30 (2006.01) C09C 1/40 (2006.01) C09C 3/10 (2006.01)

Patent

CA 2405795

Disclosed is a method for producing surface-modified fillers by spray-drying an aqueous suspension of a filler that consists of fine particles, whereby 0.1 to 50 wt. % (calculated as dry substance), preferably 0.3 up to less than 1 wt. %, of an aqueous dispersion of a thermoplastic polymer or copolymer or a caoutchouc are added. Said fillers have improved bulk material stability and improved pourability. The inventive fillers are particularly suitable as flame- retardant fillers for synthetic materials or rubber, in a cable insulation for instance.

La présente invention concerne un procédé de production de charges à surface modifiée, présentant une stabilité de masse volumique apparente améliorée et une faculté d'écoulement améliorée, par séchage par pulvérisation d'une suspension aqueuse de charge à fines particules, avec ajout de 0,1 à 50 % en poids (calculé sur la matière sèche), de préférence de 0,3 à moins de 1 % en poids d'une dispersion aqueuse d'un polymère ou copolymère thermoplastique ou d'un caoutchouc. Les charges produites selon cette invention conviennent notamment à un usage en tant que charges ignifugeantes pour des matières plastiques ou du caoutchouc, par exemple dans des isolations pour câble.

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