Dispersible articles and methods of making the same
View Patent ↗A dispersible article and methods of making the same. The article has a web of fibers and a dried binder in contact with the fibers. The web of fibers has a basis weight of from about 10 gsm to about 150 gsm. The dried binder has a polyfunctional aldehyde and a primary polymer. The primary polymer has at least one functional group that is reactive with the fibers or the polyfunctional aldehyde. The fibers have at least one functional group that is reactive with the polyfunctional aldehyde or the primary polymer. The article has a cross direction wet tensile strength after 15 minutes of aqueous saturation that is at least about 30% of an initial cross direction wet tensile strength. The article is flushable.
1. A dispersible article comprising:
a web of fibers having a basis weight of from about 10 gsm to about 150 gsm; and
a dried binder in contact with the fibers,
the dried binder comprising a polyfunctional aldehyde and a primary polymer, the primary polymer comprising at least one functional group that is reactive with the fibers or the polyfunctional aldehyde, and
the fibers comprising at least one functional group that is reactive with the polyfunctional aldehyde or the primary polymer,
wherein the article has a cross direction wet tensile strength after 15 minutes of aqueous saturation that is at least about 30% of an initial cross direction wet tensile strength, and
wherein the article is flushable.
2. The article of claim 1 , wherein the primary polymer comprises at least one polymeric segment selected from the group consisting of vinyl acetate, ethylene, vinyl alcohol, and combinations thereof.
3. The article of claim 1 , wherein the polyfunctional aldehyde is selected from the group consisting of a polyfunctional aldehyde-containing polymer, a low molecular weight polyfunctional aldehyde, a protected polyfunctional aldehyde, a glyoxalated polyacrylamide, glyoxal, a methanol protected polyfunctional aldehyde, and combinations thereof.
4. The article of any of the preceding claims, wherein the polyfunctional aldehyde is glyoxal.
5. The article of claim 1 , wherein the dried binder further comprising a secondary polymer comprising hydroxyl functionality.
6. The article of claim 1 , wherein a ratio by dry weight of primary polymer to polyfunctional aldehyde in the dried binder is from about 95:5 to about 50:50.
7. The article of claim 1 , the article comprising dried binder in an amount from about 1 wt % to about 50 wt % of the total weight of the article.
8. The article of claim 1 , wherein the web of fibers comprises natural fibers, synthetic fibers, or a combination thereof.
9. The article of claim 8 , wherein the web of fibers comprises recycled fibers.
10. The article of claim 1 , wherein the article has a pass through percentage value of at least about 50% through a 12.5 mm sieve.
11. The article of claim 1 , wherein the initial cross direction wet tensile strength is at least about 20% of an initial cross direction dry tensile strength.
12. The article of claim 1 , wherein the dried binder in contact with the fibers is formed by contacting the web with a binder composition using a spray process, a saturation process, a printing process, or a combination thereof or wherein the binder composition is applied and dried to form a bonded web.
13. The article of claim 12 , wherein the binder composition comprises formaldehyde in an amount of less than about 0.1 wt % or inorganic salt in an amount of less than about 0.1 wt %.
14. A method of making a dispersible article, the method comprising:
forming a web of fibers having a basis weight of from about 10 gsm to about 150 gsm;
contacting the web of fibers with a binder composition, wherein the binder composition comprises an aqueous polymer dispersion and a polyfunctional aldehyde; and
drying the binder composition to form a dried binder in contact with the web of fibers,
wherein the article has a cross direction wet tensile strength after 15 minutes of aqueous saturation that is at least about 30% of an initial cross direction wet tensile strength, and
wherein the article is flushable.
15. The method of claim 14 , wherein the aqueous polymer dispersion comprises a primary polymer comprising at least one polymeric segment selected from the group consisting of vinyl acetate, ethylene, vinyl alcohol, and combinations thereof.
16. The method of claim 15 , wherein the primary polymer has a glass transition temperature of less than about 60° C.
17. The method of claim 14 , wherein the polyfunctional aldehyde is selected from the group consisting of an aldehyde-containing polymer, a low molecular weight polyfunctional aldehyde, a protected polyfunctional aldehyde, a glyoxalated polyacrylamide, glyoxal, a methanol protected polyfunctional aldehyde, and combinations thereof.
18. The method of claim 14 , wherein forming a web of fibers comprises wet forming, air laying, dry forming or a combination thereof.
19. The method of claim 14 , wherein the article has a pass through percentage value of at least about 50% through a 12.5 mm sieve.
20. The method of claim 14 , wherein the contacting step is performed using a spray process, a saturation process, a printing process, or a combination thereof.
21. The method of claim 14 , wherein the contacting and drying steps are performed as part of a double re-crepe process.