NONWOVEN FABRICS AND THEIR PREPARATION

摘要

Nonwoven fabrics are disclosed which comprise fibers, at least 50% by weight of which are hydrophobic fibers such as polyester or polypropylene, and a binder comprising an emulsion copolymer. The copolymer comprises (a) 1 to 8% by weight of at least one monoethylenically unsaturated carboxylic acid, such as acrylic of methacrylic acid, (b) 50 to 75% by weight of at least one C4 to C8 alkyl acrylate, particularly butyl acrylate and (c) 20 to 49% by weight of at least one of methyl methacrylate, styrene and alpha -methyl styrene. The fabric has sufficient wet-strength for use as diaper coverstock and binders free of formaldehyde and acrylonitrile units are free of the hazardous effects of these materials.