Patent ID: 6425978
Filing Date: 2002-07-30
Classification: C08F,C08L,D04H,D06M,D21H,Y10S

Abstract:
A method for making a composite useful as a personal hygiene article which comprises:(1) treating a nonwoven fabric with a latex binder to form a fluid permeable sublayer, the latex prepared by a process which comprises the steps of: (a) polymerizing a monomer mixture comprising styrene, itaconic acid, surfactant and water soluble free radical initiator to form a seed; (b) sequentially adding equal increments of a monomer mixture of styrene, butadiene and acrylic acid to the seed under emulsion polymerization conditions to form a styrene-butadiene-acrylic acid copolymer; and then (c) neutralizing the styrene-butadiene-acrylic acid copolymer to a pH of about 4.5 to 7 to form the latex; (3) providing at least one fluid permeable topsheet layer and at least one substantially fluid impermeable backsheet layer; and (4) interposing the sublayer material between the topsheet layer and backsheet layer.