US 11,668,050 B2
Ultrasonic welding of wet laid nonwoven compositions
Charles Stuart Everett, Kingsport, TN (US); Kenny Randolph Parker, Afton, TN (US); Jeremy Kenneth Steach, Kingsport, TN (US); and Melvin Glenn Mitchell, Penrose, NC (US)
Assigned to Eastman Chemical Company, Kingsport, TN (US)
Filed by Eastman Chemical Company, Kingsport, TN (US)
Filed on Aug. 16, 2021, as Appl. No. 17/445,094.
Application 17/445,094 is a continuation of application No. 16/813,938, filed on Mar. 10, 2020, granted, now 11,118,313.
Claims priority of provisional application 62/821,518, filed on Mar. 21, 2019.
Prior Publication US 2022/0042246 A1, Feb. 10, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. D21H 15/10 (2006.01); D21F 13/00 (2006.01); D21H 27/30 (2006.01); D21H 13/06 (2006.01)
CPC D21H 15/10 (2013.01) [D21F 13/00 (2013.01); D21H 13/06 (2013.01); D21H 27/30 (2013.01)] 20 Claims
 
1. A wet laid nonwoven comprising cellulose and cellulose ester (CE) fibers; wherein at least a portion of said CE fibers are combined with said cellulose fibers; wherein said CE fibers have a denier per filament (DPF) of at least 0.5 to 3; wherein said CE fibers are present in an amount from about 0.1 wt % to less than 20 wt %; and wherein said CE fibers have a cut length of less than 6 mm; wherein said wet laid nonwoven is bonded to itself, another substrate, or another wet laid nonwoven material; and wherein said bonding is accomplished at least in part by ultrasonic welding.