EP 0462574 B2 20011219 - 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
Application
Priority
US 54007090 A 19900618
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
IPC 8 full level
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 (source: EP KR)
D04H 1/4291 (2013.01 - EP); D04H 1/544 (2013.01 - EP); D04H 1/559 (2013.01 - EP); D04H 1/56 (2013.01 - EP); D04H 3/007 (2013.01 - EP); D04H 3/02 (2013.01 - KR)
Designated contracting state (EPC)
BE DE ES FR GB IT NL SE
DOCDB simple family (publication)
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; KR 920001014 A 19920129
DOCDB simple family (application)
EP 91109987 A 19910618; AU 7704391 A 19910514; DE 69109543 T 19910618; ES 91109987 T 19910618; JP 13651291 A 19910607; KR 910009952 A 19910617