Process for coating hot melt adhesives

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 11/00 (2006.01) B01J 2/00 (2006.01) B01J 2/30 (2006.01) C08J 3/12 (2006.01)

Patent

CA 2170752

Hot melt adhesive masses are provided with a tackless surface by a process which comprises the steps of: a) extruding the hot melt adhesive through an appropriate die orifice; b) spraying the surface of the extruded adhesive with a molten film forming low molecular weight polymer or formulated polymeric material, the material being selected so that it will not appreciably detract from the properties of the adhesive composition when remelted therewith; c) heating the surface of the coated adhesive at a temperature and for a period of time sufficient to remelt the film forming polymer so as to form a continuous coating thereof yet insufficient to appreciably melt the adhesive; and d) cooling the thus coated adhesive mass to a temperature suitable for handling.

Des masses de colle thermofusible autoadhésive sont dotées d'une surface non collante au moyen d'un procédé qui consiste: a) à extruder la colle thermofusible autoadhésive à travers un orifice de filière approprié; b) à pulvériser sur la surface de la colle extrudée un polymère filmogène fondu à faible masse molaire ou une matière polymère formulée, cette matière étant sélectionnée pour qu'elle ne réduise pas significativement les propriétés de la composition de la colle lorsqu'elle est mélangée à cette dernière; c) à chauffer la surface de la colle enrobée à une température et pendant une durée suffisantes pour que le polymère filmogène refonde et forme un revêtement continu mais cependant insuffisant pour faire fondre de manière appréciable la colle; et d) à refroidir la masse de colle enrobée à une température permettant de la manipuler.

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