Dispersible nonwoven wipe material
View Patent ↗A dispersible, nonwoven multistrata wipe material is provided that is stable in a wetting liquid and flushable in use. More particularly, multilayered structures including, but not limited to, two, three, or four layers are provided to form the dispersible nonwoven wipe material. The layers contain combinations of cellulosic and noncellulosic fibers, and optionally a binder or additive.
1. A dispersible, airlaid, multistrata nonwoven wipe material having two outer layers, comprising
(A) a first layer comprising
(a) from about 50 to about 95 weight percent cellulosic fibers and
(b) from about 5 to about 50 weight percent bicomponent fibers;
(B) a second layer comprising
(a) from about 50 to about 100 weight percent cellulosic fibers and
(b) from about 0 to about 50 weight percent bicomponent fibers;
(C) a third layer comprising
(a) from about 50 to about 100 weight percent cellulosic fibers and
(b) from about 0 to about 50 weight percent bicomponent fibers,
wherein the second layer is disposed between the first and third layers,
wherein the wipe material is dispersible in water,
wherein the wipe material is structurally stable in a wetting liquid,
wherein each outer layer comprises bicomponent fibers, and
wherein at least a portion of at least one outer layer is coated on an external surface with binder.
2. The dispersible, multistrata nonwoven wipe material of claim 1 , further comprising
(D) a fourth layer comprising
(a) from about 50 to about 100 weight percent cellulosic fibers and
(b) from about 0 to about 50 weight percent bicomponent fibers.
3. The dispersible, multistrata nonwoven wipe material of claim 1 , wherein
(A) the first layer comprises
(a) from about 75 to about 95 weight percent cellulosic fibers and
(b) from about 5 to about 25 weight percent bicomponent fibers;
(B) the second layer comprises
(a) from about 95 to about 100 weight percent cellulosic fibers and
(b) from about 0 to about 5 weight percent bicomponent fibers; and
(C) the third layer comprises
(a) from about 75 to about 100 weight percent cellulosic fibers and
(b) from about 0 to about 25 weight percent bicomponent fibers.
4. The dispersible, multistrata nonwoven wipe material of claim 2 , wherein
(A) the first layer comprises
(a) from about 50 to about 95 weight percent cellulosic fibers and
(b) from about 5 to about 50 weight percent bicomponent fibers;
(B) the second layer comprises
(a) from about 95 to about 100 weight percent cellulosic fibers and
(b) from about 0 to about 5 weight percent bicomponent fibers;
(C) the third layer comprises
(a) from about 95 to about 100 weight percent cellulosic fibers and
(b) from about 0 to about 5 weight percent bicomponent fibers; and
(D) the fourth layer comprises
(a) from about 50 to about 100 weight percent cellulosic fibers and
(b) from about 0 to about 50 weight percent bicomponent fibers.
5. The dispersible, multistrata nonwoven wipe material of claim 1 , wherein the binder is water-soluble.
6. The dispersible, multistrata nonwoven wipe material of claim 1 , wherein the binder is selected from the group comprising polyethylene powders, copolymer binders, vinylacetate ethylene binders, styrene-butadiene binders, urethanes, urethane-based binders, acrylic binders, thermoplastic binders, natural polymer based binders, and mixtures thereof.
7. The dispersible, multistrata nonwoven wipe material of claim 1 , wherein the amount of binder is from about 4 to about 12 weight percent of the material.
8. The dispersible, multistrata nonwoven wipe material of claim 1 , wherein the nonwoven wipe material has a basis weight of from about 30 gsm to about 200 gsm.
9. The dispersible, multistrata nonwoven wipe material of claim 1 , wherein the nonwoven wipe material has a cross directional wet strength greater than about 200 gli.
10. The dispersible, multistrata nonwoven wipe material of claim 1 , wherein the nonwoven wipe material has a cross directional wet strength greater than about 250 gli.
11. The dispersible, multistrata nonwoven wipe material of claim 1 , wherein the nonwoven wipe material has a caliper of from about 0.25 mm to about 4 mm.
12. The dispersible, multistrata nonwoven wipe material of claim 1 , wherein the nonwoven wipe material passes an INDA Guidelines FG 512.1 Column Settling Test.
13. The dispersible, multistrata nonwoven wipe material of claim 1 , wherein the nonwoven wipe material passes an INDA Guidelines FG 521.1 30 Day Laboratory Household Pump Test designed to assess compatibility of a flushable product in residential and commercial pumping systems.
14. The dispersible, multistrata nonwoven wipe material of claim 1 ,
wherein the first layer comprises a bottom surface and a top surface and wherein at least a portion of the top surface of the first layer is coated with binder; and
wherein the third layer comprises a bottom surface and a top surface and wherein at least a portion of the bottom surface of the third layer is coated with binder.
15. The dispersible, multistrata nonwoven wipe material of claim 1 , wherein at least a portion of the cellulose fiber is modified in at least one layer.
16. The dispersible, multistrata nonwoven wipe material of claim 15 , wherein the cellulose fiber is chemically modified by at least one compound selected from the group consisting of polyvalent cation containing compound, polycationic polymer, and polyhydroxy compound.