Ion triggerable, cationic polymers, a method of making same and items using same
View Patent ↗The present invention is directed to ion triggerable, water-dispersible cationic polymers. The present invention is also directed to a method of making ion triggerable, water-dispersible cationic polymers and their applicability as binder compositions. The present invention is further directed to fiber-containing fabrics and webs comprising ion triggerable, water-dispersible binder compositions and their applicability in water-dispersible personal care products, such as wet wipes.
1. A flushable personal care product comprising a nonwoven fabric, the nonwoven fabric comprising fibrous material and a binder composition for binding the fibrous material into an integral web, the binder composition formed from at least a vinyl-functional cationic monomer and one or more hydrophobic vinyl monomer with alkyl side chains of 1 to 4 carbon atoms.
2. The flushable personal care product of claim 1 wetted by a wetting solution comprising an aqueous salt solution comprising about 0.3% to about 10% by weight of a mono or divalent salt such that the binder composition is insoluble in the wetting solution and the binder composition is dispersible in water containing up to about 200 ppm Ca 2+ and/or Mg 2+ ions.
3. The flushable personal care product of claim 2 , wherein the personal care product is a wet wipe.
4. The flushable personal care product of claim 3 , wherein the vinyl-functional cationic monomer is selected from a [2-(acryloxy)ethyl]dimethyl ammonium salt, a [2-(methacryloxy)ethyl]dimethyl ammonium salt, a [2-(acryloxy)ethyl]trimethyl ammonium salt, a [2-(methacryloxy)ethyl]trimethyl ammonium salt, a (3-acrylamidopropyl)trimethyl ammonium salt, a N,N-diallyldimethyl ammonium salt, a [2-(acryloxy)ethyl]dimethylbenzyl ammonium salt, and a [2-(methacryloxy)ethyl]dimethylbenzyl ammonium salt, and wherein the counterion forming any one of the ammonium salts is selected from chloride, bromide, iodide, and methyl sulfate.
5. The flushable personal care product of claim 3 , wherein the counterion is chloride.
6. The flushable personal care product of claim 3 , wherein the vinyl-functional cationic monomer is selected from precursor monomers selected from vinylpyridine, dimethylaminoethyl acrylate and dimethylaminoethyl methacrylate.
7. The flushable personal care product of claim 3 , wherein the hydrophobic vinyl monomer is selected from branched or linear alkyl vinyl ethers, vinyl esters, acrylamides, and acrylates.
8. The flushable personal care product of claim 3 , wherein the binder composition comprises the structure:
wherein x=1 to about 15 mole percent; y=about 60 to about 99 mole percent; and z=0 to about 30 mole percent; Q is selected from C 1 -C 4 alkyl ammonium, quaternary C 1 -C 4 alkyl ammonium, and benzyl ammonium; Z is selected from —O—, —COO—, —OOC—, —CONH—, and —NHCO—; R 1 , R 2 , R 3 are independently selected from hydrogen and methyl; R 4 is C 1 -C 4 alkyl; R 5 is selected from hydrogen, methyl, ethyl, butyl, ethylhexyl, decyl, dodecyl, hydroxyethyl, hydroxypropyl, polyoxyethylene, and polyoxypropylene.
9. The flushable personal care product of claim 3 , wherein the binder composition comprises a cationic acrylate or methacrylate and one or more alkyl acrylates or methacrylates having the structure:
wherein x=1 to about 15 mole percent; y=about 60 to about 99 mole percent; and z=0 to about 30 mole percent; R 4 is C 1 -C 4 alkyl; R 5 is selected from hydrogen, methyl, ethyl, butyl, ethylhexyl, decyl, dodecyl, hydroxyethyl, hydroxypropyl, polyoxyethylene, and polyoxypropylene.
10. The flushable personal care product of claim 3 , wherein the binder composition comprises the structure:
wherein x=1 to about 15 mole percent; y=about 85 to about 99 mole percent and R 4 is C 1 -C 4 alkyl.
11. The flushable personal care product of claim 3 , wherein the mono or divalent salt has a concentration of about 0.5% to about 5% by weight.
12. The fibrous substrate of claim 3 , wherein the mono or divalent salt is an alkali metal halide.
13. The fibrous substrate of claim 3 , wherein the mono or divalent salt is selected from NaCl, NaBr, KCl, NH 4 Cl, Na 2 SO 4 , ZnCl 2 , CaCl 2 , MgCl 2 , MgSO 4 , NaNO 3 , NaSO 4 CH 3 , and combinations thereof.
14. The fibrous substrate of claim 3 , wherein the mono or divalent salt is NaCl.
15. The flushable personal care product of claim 3 , wherein the nonwoven fabric comprises a tissue web.
16. The flushable personal care product of claim 3 , wherein the nonwoven fabric comprises an airlaid web.
17. The flushable personal care product of claim 3 , wherein the nonwoven fabric comprises a hydroentangled web.
18. The flushable personal care product of claim 3 , wherein the nonwoven fabric comprises fibers having a fiber length between about 0.2 and 6 mm.
19. The flushable personal care product of claim 3 , wherein the flushable personal care product is not dispersible in an aqueous salt solution comprising about 0.3% to about 10% by weight of a mono or divalent salt, and the fibrous material is dispersible in water containing up to about 200 ppm Ca 2+ and/or Mg 2+ ions.
20. The flushable personal care product of claim 3 , wherein the flushable personal care product comprises an in-use wet tensile strength of at least about 100 g/in when soaked with 10% to 400% by weight of the wetting solution containing more than 0.5% by weight of the mono or divalent salt, and a tensile strength of less than about 30 g/in after being soaked in water containing up to containing up to about 200 ppm Ca 2+ and/or Mg 2+ ions for 24 hours or less.