Multilayer dissolvable solid article containing coating composition and process for making the same
AssigneeThe Procter & Gamble Company
InventorsHongsing TAN, Carl David MAC NAMARA, Min JIANG, Zhaoqi FAN, Robert Wayne GLENN, JR., Dan XU, Zeying HUANG
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Abstract
This present invention provides dissolvable solid articles comprising multiple layers of flexible, dissolvable, porous sheets, in which a coating composition is present on at least one internal surface of at least one sheet in said solid articles. The present invention also provides a process for making such solid articles.
Claims20
A process for preparing a dissolvable solid article comprising the steps of:
- 1) providing two or more flexible, porous, dissolvable sheets and a coating composition, wherein each of said two or more sheets comprises a water-soluble polymer and a first surfactant and is characterized by a Percent Open Cell Content of from about 80% to about 100% and an Overall Average Pore Size of from about 100 μm to about 2000 μm, and wherein said coating composition comprises a second surfactant;
- 2) applying the coating composition on at least one surface of at least one sheet from said two or more sheets;
- and
- 3) arranging the two or more sheets into a stack to form the dissolvable solid article, wherein the stack has contact surfaces where each of the two or more sheets touch and outer surfaces wherein at least a portion of the two or more sheets do not touch, so that the coating composition is not on any of the outer surfaces of the stack.
A dissolvable solid article comprising two or more flexible, porous, dissolvable sheets, wherein each of said two or more sheets comprises a water-soluble polymer and a first surfactant and is characterized by a Percent Open Cell Content of from about 80% to about 100% and an Overall Average Pore Size of from about 100 μm to about 2000 μm;
- wherein the dissolvable solid article has an outer surface;
- and
- wherein a coating composition comprising a second surfactant is present on at least one surface of at least one of said two or more sheets, provided that said coating composition is not on any of the outer surfaces of the dissolvable solid article.
Dependencies are inferred from the claim text.