Alloys of immiscible polymers

Details Alloys of immiscible polymers Alloys of immiscible polymers

D - Textiles, Paper

04

H

D04H 1/54 (2006.01) D01F 6/46 (2006.01) D01F 6/90 (2006.01) D01F 8/06 (2006.01) D01F 8/12 (2006.01) D04H 1/42 (2006.01) D04H 1/56 (2006.01) D04H 3/16 (2006.01)

Patent

CA 2275690

An extrudable composition is provided which is made from at least two thermoplastic polymers in a biconstituent construction. One of the thermoplastic polymers is present as a dominant continuous phase and the other one or more polymers are present as a non-continuous phase or phases in an amount less than about 15 weight percent. No compatibilizer is necessary. The polymer of the non-continuous phase or phases has a polymer melt temperature less than 30 ~C below the polymer melt temperature of the continuous phase. The polymer of the dominant phase may be, for example, polypropylene and the non-continuous phase may be, for example, polyamide. The extrudable composition may be used to produce fibers which are generally between about 5 and 50 microns in diameters. The fibers may be made into nonwoven fabrics.

L'invention a trait à une composition extrudable constituée d'un moins deux polymères thermoplastiques dans une structure à deux constituants. L'un des polymères thermoplastiques est présent en tant que phase dispersante dominante et l'autre polymère, sinon plusieurs autres polymères, en phase(s) dispersée(s), sous des quantités inférieures à environ 15 % en poids. Le point de fusion du polymère de la phase dispersée, ou des phases dispersées, est inférieur à 30 ·C, au-dessous du point de fusion du polymère de la phase dispersante. Le polymère de la phase dominante est, par exemple, du polypropylène tandis que celui de la phase dispersée peut être, notamment, un polyamide. On peut utiliser cette composition extrudable à la production de fibres d'un diamètre compris, d'ordinaire, entre 5 et 50 microns environ. Ces fibres sont susceptibles de fournir des étoffes non-tissées.

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