Non-woven of spunbonded thermoplastic filaments having improved weldability properties and method for manufacturing such a non-woven
AssigneeDounor SAS
InventorStéphanie Hoyas
Life of this patent
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Abstract
The object of the present disclosure is a non-woven of spunbonded thermoplastic filaments comprising in a characteristic way, at least 95% by mass (g) of its surface mass (g/m2) of at least two polypropylene A and B polymers, said filaments having a titer of less than or equal to 1.3 dtex, said non-woven having a surface mass of less than or equal to 35 g/m2, the welding rate being at least 10% and at most 25% and at least 88% by mass (g) of its surface mass (g/m2) of said polypropylene A polymer obtained by polymerization in the presence of at least one polymerization catalyst based on a metallocene and at most 12% by mass (g) of its surface mass of said polypropylene B polymer.
Claims18
A non-woven of spunbonded thermoplastic filaments comprising a polymeric mixture, the polymeric mixture consists of a combination of (i) at least 88% by weight of polypropylene A polymer and (ii) from 3 to 12% by weight of a polypropylene B polymer, wherein said non-woven comprises at least 95% by mass (g) of it surface mass (g/m2) of at least the combination of (i) the polypropylene A polymer and (ii) the polypropylene B polymer, said filaments having a titer of from 1.0 dtex to less than or equal to 1.3 dtex, said non-woven having a surface mass of less than or equal to 35 g/m2, a welding rate being at least 10% and at most 25%,
- wherein said polypropylene A polymer is obtained by polymerization in the presence of at least one polymerization catalyst based on metallocene and said polypropylene B polymer is obtained by polymerization in the presence of a Ziegler-Natta catalyst,
- wherein said polypropylene A polymer comprises a first melt flow index that is at least 10 g/10 mins and at most 35 g/10 mins according to ISO 1133 standard, condition L, at 230° C. and with 2.16 kg, and said polypropylene B polymer comprises a second melt flow index that is at least 600 g/10 mins and at most 3,000 g/10 mins according to ISO 1133 standard, condition L, at 230° C. and with 2.16 kg;
- wherein a ratio between the second melt flow index and the first melt flow index is from 86:1-300:1, and
- wherein the polypropylene A polymer is a first homopolymer of polypropylene and the polypropylene B polymer is a second homopolymer of polypropylene;
- wherein the non-woven is thermally bondable at a bonding temperature from 150° C. to 160° C., and wherein the non-woven has a machine-direction elongation from 50.1% to 75% at break as determined by WSP 110.4(09);
- and wherein the non-woven has a perviousness (l/m2/s) measured according to the ISO 9237 standard from 1995 of less than 6,500 l/m2/s.
A non-woven of spunbonded thermoplastic filaments consisting of a polymeric mixture, the polymeric mixture consists of a combination of (i) at least 88% by weight of polypropylene A polymer and (ii) from 3 to 12% by weight of a polypropylene B polymer, wherein said non-woven comprises at least 95% by mass (g) of it surface mass (g/m2) of at least the combination of (i) the polypropylene A polymer and (ii) the polypropylene B polymer, said filaments having a titer of from 1.0 dtex to less than or equal to 1.3 dtex, said non-woven having a surface mass of less than or equal to 35 g/m2, a welding rate being at least 10% and at most 25%,
- wherein said polypropylene A polymer is obtained by polymerization in the presence of at least one polymerization catalyst based on metallocene and said polypropylene B polymer is obtained by polymerization in the presence of a Ziegler-Natta catalyst,
- wherein said polypropylene A polymer comprises a first melt flow index that is at least 10 g/10 mins and at most 35 g/10 mins according to ISO 1133 standard, condition L, at 230° C. and with 2.16 kg, and said polypropylene B polymer comprises a second melt flow index that is at least 600 g/10 mins and at most 3,000 g/10 mins according to ISO 1133 standard, condition L, at 230° C. and with 2.16 kg;
- wherein a ratio between the second melt flow index and the first melt flow index is from 86:1-300:1, and
- wherein the polypropylene A polymer is a first homopolymer of polypropylene and the polypropylene B polymer is a second homopolymer of polypropylene;
- wherein the non-woven is thermally bondable at a bonding temperature from 150° C. to 160° C., and wherein the non-woven has a machine-direction elongation from 50.1% to 75% at break as determined by WSP 110.4(09);
- and wherein the non-woven has a perviousness (l/m2/s) measured according to the ISO 9237 standard from 1995 of less than 6,500 l/m2/s.
Dependencies are inferred from the claim text.