Compositions in the form of dissolvable solid structures
Described are dissolvable, porous solid structures formed using certain vinyl acetate-vinyl alcohol copolymers. The copolymer and the porosity of the structure allow for liquid flow during use such that the structure readily dissolves to provide a desired consumer experience. Also described are processes for making open cell foam and fibrous dissolvable solid structures.
1. A fibrous dissolvable solid structure comprising a plurality of fibers comprising:
from about 3 wt % to about 75 wt % of a surfactant wherein the surfactant comprises a cationic surfactant;
from about 10 wt % to about 50 wt % of a first copolymer comprising vinyl acetate and vinyl alcohol units, wherein the copolymer comprises not more than about 84% alcohol units and has weight average molecular weight (Mw) of from about 20,000 to about 60,000;
from about 5 wt % to about 50 wt % of a second copolymer comprising vinyl acetate and vinyl alcohol units, wherein the second copolymer comprises not more than about 84% alcohol units alcohol units and has a Mw of from about 70,000 to about 500,000.
2. The fibrous dissolvable solid structure of claim 1 , wherein the copolymer comprises not more than about 82.5% alcohol units.
3. The fibrous dissolvable solid structure of claim 2 , wherein the copolymer comprises not more than about 81% alcohol units.
4. The fibrous dissolvable solid structure of claim 1 , wherein the copolymer comprises from about 65% to about 82.5% alcohol units.
5. The fibrous dissolvable solid structure of claim 4 , wherein the copolymer comprises from about 70% to about 81% alcohol units.
6. The fibrous dissolvable solid structure of claim 1 , wherein at least 25% of the fibers have an average diameter less than about 1 micron.
7. The fibrous dissolvable solid structure of claim 6 , wherein at least 50% of the fibers have an average diameter less than about 1 micron.
8. The fibrous dissolvable solid structure of claim 1 , wherein the copolymer has weight average molecular weight (Mw) of from about 70,000 to about 200,000.
9. The fibrous dissolvable solid structure of claim 1 , wherein the structure further comprises a perfume or fragrance.
10. The fibrous dissolvable solid structure of claim 1 , wherein the structure further comprises a conditioning agent selected from the group consisting of silicone conditioning agents, cationic conditioning polymers, and combinations thereof.
11. The fibrous dissolvable solid structure of claim 1 , wherein the structure comprises from about 5 wt % to about 65 wt % of the cationic surfactant.
12. The fibrous dissolvable solid structure of claim 1 , wherein the structure comprises from about 23 wt % to about 75 wt % of the cationic surfactant.
13. The fibrous dissolvable solid structure of claim 1 , wherein the plurality of fibers further comprise a fatty alcohol.
14. The fibrous dissolvable solid structure of claim 1 , wherein the structure comprises a hand dissolution value of about 1 to about 15 strokes.
15. The fibrous dissolvable solid structure of claim 1 , wherein the structure comprises a Distance to Maximum Force value of from about 6 mm to about 30 mm.