US 9,809,925 B2
Parchmentized fibrous support containing parchmentizable synthetic fibers and method of manufacturing the same
Fernando Mora, Grenoble (FR); and Hervé Planchard, Marcq en Baroeul (FR)
Assigned to AHLSTROM-MUNKSJÖ OYJ, Helsinki (FI)
Appl. No. 13/704,720
Filed by Fernando Mora, Grenoble (FR); and Hervé Planchard, Marcq en Baroeul (FR)
PCT Filed Jun. 13, 2011, PCT No. PCT/FI2011/050556
§ 371(c)(1), (2), (4) Date Feb. 21, 2013,
PCT Pub. No. WO2011/157892, PCT Pub. Date Dec. 22, 2011.
Claims priority of application No. 10166077 (EP), filed on Jun. 15, 2010.
Prior Publication US 2013/0263385 A1, Oct. 10, 2013
Int. Cl. D06M 17/00 (2006.01); D06M 11/54 (2006.01); D04H 3/08 (2006.01); D21H 13/26 (2006.01); D21H 11/20 (2006.01); D21H 25/14 (2006.01); D21H 27/08 (2006.01); D21H 25/02 (2006.01); D21H 27/06 (2006.01); D04H 1/4209 (2012.01); D04H 1/4342 (2012.01); D04H 1/4382 (2012.01)
CPC D06M 11/54 (2013.01) [D04H 1/4209 (2013.01); D04H 1/4342 (2013.01); D04H 1/4382 (2013.01); D04H 3/08 (2013.01); D21H 13/26 (2013.01); D21H 11/20 (2013.01); D21H 25/14 (2013.01); D21H 27/08 (2013.01)] 14 Claims
 
1. A process of making a parchmentized fibrous support comprising the steps of:
(a) forming a fibrous support comprised of parchmentizable synthetic aramid fibers and parchmentizable synthetic aramid fibrids; and
(b) parchmentizing the parchmentizable synthetic aramid fibers and fibrids of the fibrous support by treating the fibrous support with H2SO4 at a concentration from about 50% to about 100% and at a temperature from about −20° C. to about +50° C. for between about 5 to about 60 seconds sufficient to obtain a parchmentized fibrous support having an increased strength of at least 30% as compared to the strength of the fibrous support formed according to step (a).