Global Patent Index - EP 0462574 B2

EP 0462574 B2 2001-12-19 - Nonwoven web and method of forming same

Title (en)

Nonwoven web and method of forming same

Title (de)

Vliesstoff und Verfahren zu seiner Herstellung

Title (fr)

Etoffe non-tissée et son procédé de réalisation

Publication

EP 0462574 B2 (EN)

Application

EP 91109987 A

Priority

US 54007090 A

Abstract (en)

[origin: EP0462574A1] A nonwoven web (32) suitable as a barrier layer in an SMS fabric laminate (12) is provided. The web is formed at commercially acceptable polymer melt throughputs (greater than 3 PIH) by using a reactor granule polyolefin, preferably polypropylene, that has been modified by the addition of peroxide in amounts ranging from up to 3000 ppm to reduce the molecular weight distribution from an initial molecular weight distribution of from 4.0 to 4.5 Mw/Mn to a range of from 2.2 to 3.5 Mw/Mn. Also the addition of peroxide increases the melt flow rate (lowers viscosity) to a range between 800 up to 5000 gms/10 min at 230 DEG C. The resulting web has an average fiber size of from 1 to 3 mu m and pore sizes distributed predominantly in the range from 7 to 12 mu m, with a lesser amount of pores from 12 to 25 mu m, with virtually no pores greater than 25 mu m, and with the peak of the pore size distribution less than 10 mu m. <IMAGE>

IPC 1-7 (main, further and additional classification)

D04H 1/54

IPC 8 full level (invention and additional information)

A61B 19/08 (2006.01); A61L 27/00 (2006.01); C08L 101/00 (2006.01); D04H 3/00 (2006.01); D04H 3/16 (2006.01); D04H 13/00 (2006.01)

CPC (invention and additional information)

D04H 3/007 (2013.01); D04H 1/4291 (2013.01); D04H 1/544 (2013.01); D04H 1/559 (2013.01); D04H 1/56 (2013.01)

Designated contracting state (EPC)

BE DE ES FR GB IT NL SE

EPO simple patent family

EP 0462574 A1 19911227; EP 0462574 B1 19950510; EP 0462574 B2 20011219; AU 636487 B2 19930429; AU 7704391 A 19911219; DE 69109543 D1 19950614; DE 69109543 T2 19950921; DE 69109543 T3 20020808; ES 2071865 T3 19950701; JP 2849591 B2 19990120; JP H07119014 A 19950509; KR 0158457 B1 19981201

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