Flexible and dissolvable solid sheet article

Patent metadata

Field	Value
Publication number	US-12441967-B2
Application number	US-202117368895-A
Country	US
Kind code	B2
Filing date	Jul 7, 2021
Priority date	Jan 15, 2019
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

This provides a flexible and dissolvable solid sheet article containing a PVA polymer or copolymer having a weight average molecular weight of from 50,000 to 400,000 Daltons and a major surfactant selected from the group consisting of C 6 -C 20 linear alkylbenzene sulfonates (LAS), alkoxylated sodium trideceth sulfates (STS), and combinations hereof.

First claim

What is claimed is:

1. A solid article, comprising:
i) from 40% to 70%, by weight of said solid article, of a first surfactant comprising C 6 -C 20 linear alkylbenzene sulfonates (LAS);
ii) from 10% to 40%, by weight of said solid article, of a second surfactant comprising C 6 -C 20 linear or branched alkylalkoxy sulfates (AAS) having a weight average degree of alkoxylation ranging from 0.5 to 10, and C 6 -C 20 linear or branched alkylalkoxylated alcohols (AA) having a weight average degree of alkoxylation ranging from 5 to 15; and
iii) from 10% to 30%, by weight of said solid article, of a polyvinyl alcohol having a weight average molecular weight of from 50,000 to 400,000 Daltons,
wherein said solid article is in a form of a flexible and dissolvable sheet;
wherein said solid article has a bottom-to-top Average Pore Size ratio from 0.6 to 1.5; and
wherein a Top Surface Average Pore Diameter of said solid article is greater than 100 μm.

2. The solid article of claim 1 , which comprises from 40% to 65%, by weight of said solid article, of said first surfactant.

3. The solid article according to claim 1 , which comprises no more than 15%, by weight of said solid article, of non-aromatic and unalkoxylated C 6 -C 20 linear or branched alkyl sulfates (AS).

4. The solid article according to claim 1 , wherein said polyvinyl alcohol has a weight average molecular weight ranging from 60,000 to 300,000 Daltons.

5. The solid article according to claim 1 , which comprises no more than 20%, by weight of said solid article, of starch.

6. The solid article according to claim 1 , which further comprises from 0.1% to 25%, of a plasticizer; wherein said plasticizer is selected from the group consisting of glycerin, ethylene glycol, polyethylene glycol, propylene glycol, and combinations thereof.

7. The flexible and dissolvable solid sheet article of claim 1 , wherein said solid sheet article is porous and is characterized by:
a Percent Open Cell Content of from 80% to 100%; and/or
an Overall Average Pore Size of from 100 μm to 2000 μm; and/or
an Average Cell Wall Thickness of from 5 μm to 200 μm; and/or
a final moisture content of from 0.5% to 25% by weight of said solid sheet article; and/or
a thickness of from 0.5 mm to 4 mm; and/or
a basis weight of from 50 grams/m 2 to 250 grams/m 2 ; and/or
a density of from 0.05 grams/cm 3 to 0.5 grams/cm 3 ; and/or
a Specific Surface Area of from 0.03 m 2 /g to 0.25 m 2 /g.

8. The solid article of claim 1 , which comprises from 40% to 60%, by weight of said solid article, of said first surfactant.

9. The solid article of claim 2 , which comprises from 10% to 30%, by weight of said solid article, of said second surfactant.

10. The solid article of claim 2 , which comprises from 15% to 25%, by weight of said solid article, of said second surfactant.

11. The solid article according to claim 1 , which comprises from 0% to 10%, by weight of said solid article, of non-aromatic and unalkoxylated C 6 -C 20 linear or branched alkyl sulfates (AS).

12. The solid article according to claim 1 , which comprises from 0% to 1%, by weight of said solid article, of non-aromatic and unalkoxylated C 6 -C 20 linear or branched alkyl sulfates (AS).

13. The solid article according to claim 1 , which comprises from 15% to 30%, by weight of said solid article, of said polyvinyl alcohol.

14. The solid article according to claim 1 , wherein said polyvinyl alcohol has a weight average molecular weight ranging from 70,000 to 200,000 Daltons; and wherein said polyvinyl alcohol is characterized by a degree of hydrolysis ranging from 40% to 100%.

15. The solid article according to claim 1 , which further comprises from 0.5% to 20% of a plasticizer; wherein said plasticizer is selected from the group consisting of glycerin, ethylene glycol, polyethylene glycol, propylene glycol, and combinations thereof.

16. The solid article of claim 15 , wherein said plasticizer comprises glycerin.

Assignees

• Procter & Gamble

Inventors

• Tan Hongsing
• Macnamara Carl David
• Glenn Jr Robert Wayne
• Tang Ming
• Okada Toshiyuki

Classifications

• C11D3/3753

  Polyvinylalcohol; Ethers or esters thereof · CPC title

• C11D3/222

  Natural or synthetic polysaccharides, e.g. cellulose, starch, gum, alginic acid or cyclodextrin · CPC title

• C11D3/2065

  Polyhydric alcohols · CPC title

• C11D1/831

  of sulfonates with ethers of polyoxyalkylenes without phosphates · CPC title

• C11D1/72

  Ethers of polyoxyalkylene glycols · CPC title