Crosslinkable cationic emulsion binders and their use as a binder for nonwovens
View Patent ↗The present invention is directed to a cationic polymer emulsion binder that may be combined with a cationic active ingredient and used as a non-woven binder. This combination of cationic binder and cationic active ingredient may occur as a mixture of a cationic binder and at least one cationic active ingredient, which is then applied to loose fibers to form a non-woven; or the combination may occur after a non-woven is formed using a cationic binder, and said non-woven is then contacted with a cationic active ingredient. Non-woven wipes of the invention retain far less cationic active ingredients during use, resulting in less waste and less use of the active ingredients for the same effect as wipes made with anionic or non-ionic binders.
1. A non-woven product comprising: a) a nonwoven web of fibers; and b) a binder comprising a cross-linkable cationic emulsion copolymer composition at an effective amount to bind the fibers together to form a self-sustaining web, wherein said cationic emulsion copolymer comprises from 0.1 to 25 parts per hundred of cationic monomer units which are polymerized into the backbone of the copolymer; wherein said cationic copolymer comprises a copolymer of vinyl acetate, ethylene, in addition to said cationic monomer units.
2. The non-woven product of claim 1 wherein said product further comprises one or more cationic active ingredients.
3. The non-woven product of claim 1 wherein said emulsion copolymer has a Tg of from −60° C. to +105° C.
4. The non-woven product of claim 3 wherein said emulsion copolymer has a Tg of from −40° C. to +35° C.
5. The non-woven product of claim 1 wherein said product comprises said binder at an add-on level of from 0.1 to 100 percent.
6. The non-woven product of claim 5 wherein said product comprises said binder at an add-on level of from 3 to 30 percent.
7. A non-woven product comprising a) a nonwoven web of fibers; b) a binder comprising a cross-linkable cationic emulsion copolymer composition at an effective amount to bind the fibers together to form a self-sustaining web, wherein the cationic emulsion copolymer comprises from 0.1 to 25 parts per hundred of cationic monomer units which are polymerized into the backbone of the copolymer; and c) one or more cationic active ingredients.
8. The non-woven product of claim 7 wherein said cationic copolymer further comprises vinyl acetate and ethylene monomer units.
9. The non-woven product of claim 7 wherein said cationic copolymer further comprises (meth)acrylate monomer units.
10. The product of claim 7 wherein said composition is free of anionic active ingredients.
11. The product of claim 7 wherein said cationic copolymer emulsion comprises a polymer stabilized with a cationic surfactant or cationic stabilizer.
12. The product of claim 7 comprising from 0.1 to 5 percent by weight of said cationic active ingredient, based on the weight of said binder.
13. The product of claim 12 comprising from 1 to 2 percent by weight of said cationic active ingredient, based on the weight of said binder.
14. The nonwoven product of claim 2 , wherein the cationic active ingredient comprises a quaternary alkyl ammonium chloride.
15. The nonwoven product of claim 2 , wherein the cationic active ingredient is selected from the group consisting of benzalkonium chlorides, benzethonium chlorides, and combinations thereof.
16. A nonwoven product comprising:
a) a nonwoven web of fibers;
b) a binder comprising a cross-linkable cationic emulsion copolymer composition at an effective amount to bind the fibers together to form a self-sustaining web, wherein said cationic emulsion copolymer comprises from 0.1 to 25 parts per hundred of cationic monomer units which are polymerized into the backbone of the copolymer; and
c) from 0.1 to 5 wt. percent of a cationic active ingredient based on the weight of the binder, which is applied to the nonwoven web.
17. The nonwoven product according to claim 16 , wherein the cationic active ingredient is present in an aqueous solution.