(12) United States Patent (10) Patent No.: US 8,133,584 B2 Zhu (45) Date of Patent: Mar
USOO8133584B2 (12) United States Patent (10) Patent No.: US 8,133,584 B2 Zhu (45) Date of Patent: Mar. 13, 2012 (54) CRYSTALLIZED META-ARAMID BLENDS 3,673,143 A 6, 1972 Bair et al. FOR FLASH FIRE AND ARC PROTECTION 3.3 A 2. E. lis HAVING IMPROVED COMFORT 3,819,587 A 6, 1974 Kwoleck 3,869,429 A 3, 1975 Blades (75) Inventor: Reiyao Zhu, Moseley, VA (US) 4,172,938 A 10/1979 Mera et al. 4,612,150 A 9, 1986 DeHowitt (73) Assignee: E.I. du Pont de Nemours and 4,668,234 A 5, 1987 Vance et al. Company, Wilmington, DE (US) 4,755,335 A T. 1988 Ghorashi 4,883,496 A 11, 1989 Ghorashi (*) Notice: Subject to any disclaimer, the term of this 39: A 2: ER, al. patent is extended or adjusted under 35 5,506,042 A 4/1996 Ichibori et al. U.S.C. 154(b) by 16 days. 7,156,883 B2 * 1/2007 Lovasic et al. ............... 8, 11551 7,348,059 B2 3/2008 Zhu et al. 2005/0O25963 A1 2, 2005 Zhu (21) Appl. No.: 12/756,513 2010/01 12312 A1* 5, 2010 Tutterow et al. .............. 428,196 (22) Filed: Apr. 8, 2010 * cited by examiner (65) Prior Publication Data Primary Examiner — Jennifer Chriss US 2011 FO250810 A1 Oct. 13, 2011 Assistant Examiner — Ricardo E. Lopez (51) Int. Cl. (57) ABSTRACT B32B 27/4 (2006.01) A yarn, fabric, and garment Suitable for use in arc and flame D02G 3/00 (2006.01) protection and having improved flash fire protection consist DO3D 5/2 (2006.01) ing essentially of from (a) 50 to 80 weight percent meta D04H I3/00 (2006.01) aramid fiber having a degree of crystallinity of at least 20%, (52) U.S.
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