A nonwoven layer of sheeting is extrusion-coated on one side with ethylene polymers, propylene polymers, modified propylene polymers and fillers. The nonwoven layer of sheeting is formed from polyethylene, polypropylene, polyethylene terephthalate and/or polyamide. The coated nonwoven sheeting is su
A nonwoven layer of sheeting is extrusion-coated on one side with ethylene polymers, propylene polymers, modified propylene polymers and fillers. The nonwoven layer of sheeting is formed from polyethylene, polypropylene, polyethylene terephthalate and/or polyamide. The coated nonwoven sheeting is subjected to longitudinal and transverse stretching and white crackling cloudiness develops. The extrusion-coated nonwoven sheeting has a textile texture and is suitable for use in hygiene products, in medical products, in the textile and clothing industry, in the automobile industry and in construction products.
대표청구항▼
[ What is claimed is:] [1.]1. Extrusion-coated nonwoven sheeting comprising:a nonwoven sheeting layer comprising a polymer selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate and polyamide having a weight per unit area of 5 to 100 g/m.sup.2, andan extrusion
[ What is claimed is:] [1.]1. Extrusion-coated nonwoven sheeting comprising:a nonwoven sheeting layer comprising a polymer selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate and polyamide having a weight per unit area of 5 to 100 g/m.sup.2, andan extrusion coating on the nonwoven sheeting layer having a weight per unit area of 5 to 70 g/m.sup.2, a white crackling cloudiness of 0.1 to 5, a pore area distribution for at least 90 percent of all pores ranging in area from 0.03 to 0.20 .mu.m.sup.2, the maximum pore area being less than 1 .mu.m, said extrusion coatings comprising:a) ethylene homopolymers or copolymers of 70 to 99 percent by weight of ethylene and 30 to 1 percent by weight of .alpha.-olefins with 4 to 18 carbon atoms and/or vinyl acetate and/or aliphatic C.sub.1 to C.sub.4 alkyl (meth)acrylates with melt indexes of 0.1 to 100 g/10 minutes at 190.degree. C./2.16 kg and/orb) propylene homopolymers or copolymers of 70 to 99 percent by weight of propylene and 30 to 1 percent by weight of ethylene and/or .alpha.-olefins with 4 to 18 carbon atoms,c) 1 to 50 percent by weight, based on the propylene polymers b), of modified propylene polymers with melt indexes of 0.1 to 50 g/10 minutes at 230.degree. C./2.16 kg and a ratio of the intrinsic viscosity of the modified polypropylene to the intrinsic viscosity of the unmodified polypropylene with the same weight average molecular weight of 0.20 to 0.95,d) 10 to 60 percent by weight, based on the sum of the polymers a), b) and c), of organic and/or inorganic fillers with a particle diameter, measured over the major axis of the particles, of 0.1 to 10 .mu.m, ande) 0.01 to 2.5 percent by weight of stabilizers, 0.01 to 1 percent by weight of processing aids, and 0.1 to 1 percent by weight of antistatic agents and/or 0.05 to 1 percent by weight of nucleating agents, in each case based on the sum of the polymers a), b) and c) whereinthe extrusion-coated nonwoven sheeting is produced by a method comprising the steps of:providing the nonwoven sheeting layer;providing the extrusion coating, the residual moisture content of the extrusion coating being less than 600 ppm, in a melt at mass temperatures of 170.degree. to 290.degree. C. and at an equipment speed of 50 to 300 m/min,applying the extrusion coating;subjecting the extrusion coated nonwoven sheeting at temperatures of 60.degree. to 0.degree. C. below the crystallization temperature of the extrusion coating to longitudinal stretching of 1:1.1 to 1:6 and;subjecting the extrusion coated nonwoven sheeting at temperatures of 80.degree. to 1.degree. C. below the melting temperature of the extrusion coatings to a transverse stretching of 1:1.1 to 1:6,wherein the extrusion-coated nonwoven sheeting has a tensile strength of 4 to 20 MPa in the longitudinal direction and 2 to 15 MPa in the transverse direction and a total weight per unit area of 10 to 100 g/m.sup.2.
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McCormack Ann Louise ; Strack David Craige ; Shultz Jay Sheldon ; Cartwright William F. ; Blaney Carol A., Microporous film with liquid triggered barrier feature.
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