PERMEABLE FILMS AND FILM-NONWOVEN COMPOSITE MATERIAL AND METHODS OF PREPARATION THEREOF Russian patent published in 1999 - IPC

FIELD: chemical industry. SUBSTANCE: described is film-nonwoven material having steam passage rate of at least 100 g/sq.cm for 24 hours prepared from mixture consisting predominantly of linear polyolefin, filler and fibrous nonwoven fabric bonded with nonwoven fabric to form laminated material. Film is prepared from mixture comprising dry matter with respect to total weight of film, about 10-68 or preferably 30-80% of linear polyolefin, about 30-80% of filler and about 2-20% of binder, film to fibrous fabric is bonded directly by thermofixation, and rapture strength of the resulting laminated material is at least 24 hours. Described is also method of preparing said material. Some thermoplastic films such as linear low density polyethylene are difficult for thermofixation e.g. with nonwoven polypropylene fabric due to incompatibility of two polymers. Adhesive agent is introduced into one or two of layers thus making two layers less thermofixable. EFFECT: more efficient preparation method. 16 cl, 2 dwg, 4 ex, 3 tbl