C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
117/43, 400/5925
C08L 33/06 (2006.01) C08F 218/04 (2006.01) C08F 220/10 (2006.01) C08L 31/04 (2006.01) D04H 1/64 (2006.01) D04H 13/00 (2006.01)
Patent
CA 1093725
ABSTRACT OF THE DISCLOSURE An improved latex binder for nonwoven webs comprising an acrylate- and/or vinyl acetate-based emulsion copolymer containing 0.1 - 10% by weight of 2-hydroxyethyl or 2-hydroxypropyl acrylate or meth- acrylate is prepared by employing in comblnation with the copolymer 0.2 - 10% by weight, on latex solids, of anionic surfactant and 0.3 - 15% by weight, on latex solids, of nonionic surfactant in selected relative proportions and by adding to the copolymer latex after poly- merization 1 - 40% by weight, on latex solids, of a water-soluble salt. The resultant binder is characterized by being stable to coagulation at room temperature but coagulable at a temperature between 37 and 85°C. In the preparation of nonwoven fiber material, a nonwoven web is impregnated with the copolymer latex binder, heated to a temperature of within 37 and 85°C. sufficient to coagulate the binder within the web and thus prevent migration, and finally dried to form a chemically bonded, nonwoven fiber material in sheet form.
308608
Caimi Ronald J.
Schlauch Walter F.
Borden Ladner Gervais Llp
National Starch And Chemical Corporation
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