Nonwoven abrasive article and method of making same

B - Operations – Transporting – 24 – D

Patent

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Details

B24D 3/28 (2006.01) A47L 13/16 (2006.01) B24D 11/00 (2006.01) F02B 75/02 (2006.01)

Patent

CA 2197214

An open low-density abrasive article comprising in combination: (a) a lofty, open, nonwoven three-dimensional fibrous web formed of a plurality of interentangled randomly-extending polyamide staple fibers including points of intersection and contact between the fibers, the points of intersection and contact between the fibers being bonded together to form a three-dimensionally integrated structure throughout the web, wherein the fibers comprise surfaces and a fiber tenacity of less than 5g/denier; (b) abrasive particles dispersed throughout the web and securely adhered to the surfaces of the fibers; and (c) resinous material dispersed throughout the web comprising (i) a hard phenolic resin formed as a cured product of a phenolic resin precursor distributed throughout the web and in contact with the fibers, and (ii) a modifier component of the type and in an amount effective to substantially prevent chemical degradation of the fibers while in contact with the phenolic resin precursor. The invention also relates to methods of making such an abrasive article and converted forms of the abrasive article.

Article abrasif non tissé à structure ouverte de faible densité comportant les éléments combinés suivants: (a) un mat tridimensionnel poreux et fibreux à structure ouverte et constitué par de multiples fibrilles entremêlées de polyamide à direction aléatoire comportant des points de contact et d'intersection entre les fibrilles collés ensemble de manière à former une structure tridimensionnelle intégrée dans la masse du mat, dans laquelle les fibres ont une surface et une ténacité de moins de 5g/denier; (b) des particules abrasives dispersées dans le mat et adhérant fortement à la surface des fibres; et (c) un matériau résineux dispersé dans la masse du mat et comprenant (i) une résine phénolique dure servant de durcisseur pour le précurseur réparti dans la masse du mat et en contact avec les fibres, et (ii) un agent modifiant d'un type et selon une quantité propres à prévenir toute dégradation chimique des fibres lorsqu'elles sont en contact avec le précurseur de la résine phénolique. L'invention porte également sur des procédés de fabrication dudit article et sur ses formes diverses.

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