| 摘要 |
FIELD: chemistry.SUBSTANCE: claimed invention relates to polyvinyl alcohol nonwoven films and fabrics and method of obtaining them. Nonwoven air-permeable fabric or film contains polyvinyl alcohol and has at least one coalesced surface layer, containing low porous polyvinyl alcohol, and layer, consisting in fact from fibrous polyvinyl alcohol. Said coalesced layer is more susceptible to heat transmission that said fibrous layer. Method of selective modification of surface of polyvinyl alcohol film or fabric is realised by selective coalescing of at least one surface of polyvinyl alcohol by means of heat and water with formation of low porous surface layer, attached to layer of non-modified polyvinyl alcohol. Film or fabric are soluble at higher temperatures.EFFECT: provided is obtaining outer surface of polyvinyl alcohol air-permeable fabric with unlimitedly regulated porosity and susceptibility to heat transmission, instant dissolution in water with temperature 80-90°C.19 cl, 8 dwg, 3 ex |
