Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
63 words
Two-component fibres andowed with a surface area of at least 1 m2/g and having tenacity values higher than 3,000 meters, comprising a core consisting of an olefinic polymer and an outer sheath consisting of a hydrophilic polymer, said outer sheath being in an amount comprised between 2% and 50% by weight on the sum of the weights of said olefinic and hydrophilic polymers.
Claim 2
Dependent Claim
63 words
Two-component fibres andowed with a surface area of at least 1 m2/g and having tenacity values higher than 3,000 meters, comprising a core consisting of an olefinic polymer and an outer sheath consisting of a hydrophilic polymer, said outer sheath being in an amount comprised between 2% and 50% by weight on the sum of the weights of said olefinic and hydrophilic polymers.
Claim 3
Dependent Claim
12 words
Fibres according to claim 1 having tenacity values higher than 5,000 meters.
Claim 4
Dependent Claim
32 words
Fibres according to claim 1 wherein said outer sheatt is in an amount comprised 4% and 35% by weight on the sum of the weights of the olefinic and hydrophi lic polymers.
Claim 5
Dependent Claim
14 words
Fibres according to claim 1 having values of the self-cohesion higher than 300 meters.
Claim 6
Dependent Claim
39 words
Fibres according to claim 1, wherein said hydrophi lic polymer is selected from the group consisting of the polyamides, polyacrylonitrile, polyvinylalcohol, polycarbonate, polyester resins, carboxyme thylcellulose, cellulose acetate, starch, poly- arylsulphones, polyvinylacetate, polyvinylpyrroli done, vinylchloride/vinylacetate copolymers, acry lonitrile/styrene copolymers.
Claim 7
Dependent Claim
139 words
Process for preparing fibres according to claim 1, which comprises extruding through an orifice, in a medium at a lower pressure, a mixture in the form of a stable emulsion formed by the solution of an olefinic polymer and the solution of a hydrophilic polymer in solvents that are at least in part reci procally insoluble, at a temperature exceeding the boiling temperature of the solvent for the olefinic polymer, and at least equal to the dissolution temperature of the olefinic polymer in said solvent, and under an autogenous pressure or higher pressure, the volume ratio of the solvent for the olefinic polymer to the solvent for the hydrophilic polymer being in said emulsion of at least 2.5, and the concentration of the hydrophilic polymer in its own solution being of at least 2 grams per liter of solvent.