Sizing fibres with aqueous bath contng copolymer of

摘要

Sizing fibres formed of cellulose and/or polyacrylonitrile or contng. at least 30% of these fibres by deposition of an aqs. sizing bath contng. a copolymer of (a) acrylonitrile and (b) acrylic acid or sodium or ammonium acrylate contng. (a) and (b) in mol. ratio 1 : 1.5 to 1 : 7, pref. 1 : 2-1 : 6, and in 10% aqs. soln. at 20 deg.C., having viscosity 20-2000 cP. pref. 250-2000 cP. and pH 2.5-6.5, pref. 3-5.5. The polymers dissolve readily in water and the sizing baths can be produced in cold water with moderate stirring. There is no loss by evaporation during application and the polymers give similar or improved effects in smaller amounts than normal sizes, e.g. improved abrasion resistance. The baths are stable and can be kept for several weeks, and the sizes are readily removed by washing.