Process for producing coagulated latex particles

Details Process for producing coagulated latex particles Process for producing coagulated latex particles

C - Chemistry, Metallurgy

08

J

C08J 3/12 (2006.01) C08F 6/22 (2006.01)

Patent

CA 2612657

An object of the present invention is to provide a new granulating process which can recover desired coagulated latex particles with a significantly excellent yield, and can suppress secondary coagulation under the condition having a higher temperature than a softening point of a polymer, without deteriorating the original quality of the polymer itself. A process for producing coagulated latex particles which can suppress the secondary coagulation under the condition having the broad temperature range, without deteriorating the original quality of the polymer itself by spraying or dropping a polymer latex into a gas-phase containing an inorganic salt and/or an acid, and a dispersant in an aerosol form, and dropping or feeding the droplets of the polymer latex into an aqueous phase containing a dispersant.

L'invention concerne un nouveau procédé de granulation permettant de récupérer des particules de latex coagulées objectives à un rendement très élevé, sans nuire aux qualités inhérentes au polymère dont est composé le latex, tout en inhibant une agglomération secondaire et ce, même à des températures supérieures au point de ramollissement du polymère. L'invention porte sur un procédé de production de particules de latex coagulées qui consiste à pulvériser ou à faire couler goutte-à-goutte un latex polymère dans une phase gazeuse contenant un sel inorganique et/ou un acide et un dispersant sous forme de fumées, et à faire tomber goutte-à-goutte ou projeter les gouttelettes de latex polymère dans une phase aqueuse contenant un dispersant. Ce procédé peut parvenir à coaguler un latex polymère sans nuire aux qualités inhérentes du polymère tout en inhibant une agglomération secondaire couvrant une vaste plage de températures.

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