Water-soluble unit dose articles made from a combination of different films

Patent metadata

Field	Value
Publication number	US-11473039-B2
Application number	US-201916601224-A
Country	US
Kind code	B2
Filing date	Oct 14, 2019
Priority date	Jun 13, 2016
Publication date	Oct 18, 2022
Grant date	Oct 18, 2022

Abstract

The present disclosure relates to pouches made from a combination of chemically different water-soluble films and optionally containing a composition (e.g. a household care composition or non-household care composition) that is at least partially enclosed by the water-soluble films in at least one compartment.

First claim

What is claimed is:

1. A water-soluble unit dose article comprising at least one sealed compartment optionally comprising at least one composition contained in the article, the water-soluble unit dose article comprising a first water soluble film comprising a PVOH polymer comprising a first anionic content;
and a second water soluble film comprising a PVOH polymer comprising a second anionic content;
wherein the first anionic content is in a range of about 0.5 mol % to about 10 mol % of total PVOH polymer in the first water soluble film and the second anionic content is in a range of about 0 mol % to about 5 mol % of total PVOH polymer in the second water soluble film, and the difference between the first anionic content and second anionic content is about 0.05 mol % to about 4 mol %, wherein the anionic content of each film is the molar percentage of anionic monomer units present in the total PVOH polymer of the film, and wherein the first water-soluble film is chemically different from the second water soluble film with respect to the anionic content of the PVOH polymers of the films;
wherein the first film is sealed to the second film to form the at least one sealed compartment;
wherein the first water soluble film comprises a first water soluble PVOH resin and the second water soluble film comprises a second water soluble PVOH resin;
wherein the first water soluble resin comprises a first blend of at least one polyvinyl alcohol copolymer comprising an anionic monomer unit(s) and at least one polyvinyl alcohol homopolymer, the second water soluble resin comprises a second blend of at least one polyvinyl alcohol copolymer comprising an anionic monomer unit(s) and at least one polyvinyl alcohol homopolymer, and the first blend is chemically different from the second blend; and
wherein the first blend comprises a monomethyl maleate modified PVOH resin and a PVOH homopolymer resin and the second blend comprises a monomethyl maleate modified PVOH resin and a PVOH homopolymer resin;
provided that when the composition is a fabric care or household care composition and a film comprises a blend of a polyvinyl alcohol homopolymer resin and an anionic polyvinyl alcohol copolymer resin, then both the first water soluble film and the second water soluble film comprise blends that include 65 wt. % or greater of an anionic polyvinyl alcohol copolymer resin, based on the total weight of polyvinyl alcohol resins in the blend; and
provided that when the composition is a fabric care or household care composition and a film comprises a blend of at least two anionic polyvinyl alcohol copolymer resins, then both then first water soluble film and the second water soluble film comprise blends of at least two anionic polyvinyl alcohol copolymer resins.

2. The water-soluble unit dose article of claim 1 , wherein the first anionic content is greater than the second anionic content.

3. The water-soluble unit dose article according to claim 1 , wherein the first water soluble resin comprises a first blend of two or more polyvinyl alcohol copolymers comprising anionic monomer unit(s), the second water soluble resin comprises a second blend of two or more polyvinyl alcohol copolymers comprising anionic monomer unit(s), and the first blend is chemically different from the second blend.

4. The water-soluble unit dose article of claim 1 , wherein the first water soluble resin comprises from 65% by weight or greater of the first water soluble resin of the polyvinyl alcohol copolymer comprising an anionic monomer unit and the second water soluble resin comprises from 65% by weight or greater of the second water soluble resin of the polyvinyl alcohol copolymer comprising an anionic monomer unit.

5. The water-soluble unit dose article of claim 1 , wherein the first water soluble resin comprises from about 1% to about 70% by weight of the first water soluble resin of the polyvinyl alcohol copolymer comprising an anionic monomer unit and from about 30% to about 99% by weight of the first water soluble resin of the polyvinyl alcohol homopolymer.

6. The water-soluble unit dose article of claim 5 , wherein the first water soluble resin comprises from about 10 wt % to about 70 wt % by weight of the first water soluble resin of the polyvinyl alcohol copolymer comprising an anionic monomer unit.

7. The water-soluble unit dose article of claim 1 , wherein the second water soluble resin comprises from about 1 wt % to about 70 wt % by weight of the second water soluble resin of the polyvinyl alcohol copolymer comprising an anionic monomer unit and from about 30 wt % to about 99 wt % by weight of the second water soluble resin of the polyvinyl alcohol homopolymer.

8. The water-soluble unit dose article of claim 7 , wherein the second water soluble resin comprises from about 10 wt % to about 70 wt % by weight of the second water soluble resin of the polyvinyl alcohol copolymer comprising an anionic monomer unit.

9. The water-soluble unit dose article of claim 1 , wherein the first water soluble resin comprises from about 10 wt % to about 32 wt % by weight of the first water soluble resin of the polyvinyl alcohol copolymer comprising an anionic monomer unit and the second water soluble resin comprises from about 33 wt % to about 50 wt % by weight of the second water soluble resin of the polyvinyl alcohol copolymer comprising an anionic monomer unit.

10. The water-soluble unit dose article of claim 1 , wherein the first water soluble resin comprises at least one polyvinyl alcohol copolymer(s) comprising from about 2 mol % to about 8 mol % of the anionic monomer unit with respect to total polyvinyl alcohol copolymer present.

11. The water-soluble unit dose article of claim 1 , wherein the second water soluble resin comprises at least one polyvinyl alcohol copolymer(s) comprising from about 2 mol % to about 8 mol % of the anionic monomer unit with respect to total polyvinyl alcohol copolymer present.

12. The water-soluble unit dose article of claim 1 , wherein the first water soluble resin comprises at least one polyvinyl alcohol copolymer(s) comprising from about 1 mol % to about 3 mol % of the anionic monomer unit with respect to total polyvinyl alcohol copolymer present and the second water soluble resin comprises at least one polyvinyl alcohol copolymer(s) comprising from about 4 mol % to about 8 mol % of the anionic monomer unit with respect to total polyvinyl alcohol copolymer present.

13. The water-soluble unit dose article according to claim 1 , wherein the first water soluble film is a thermoformed film.

14. The water-soluble unit dose article according to claim 13 , wherein the second water soluble film is not a thermoformed film.

15. The water-soluble unit dose article according to claim 1 , wherein the anionic content of the a first water soluble film or the a second water soluble film further comprises an anionic monomer unit derived from a monomer selected from the group consisting of vinyl acetic acid, alkyl acrylates, maleic acid, monoalkyl maleate other than monomethyl maleate, dialkyl maleate, dimethyl maleate, maleic anhydride, fumaric acid, monoalkyl fumarate, dialkyl fumarate, monomethyl fumarate, dimethyl fumarate, fumaric anhydride, itaconic acid, monomethyl itaconate, dimethyl itaconate, itaconic anhydride, citraconic acid, monoalkyl citraconate, dialkyl citraconate, citraconic anhydride, mesaconic acid, monoalkyl mesaconate, dialkyl mesaconate, mesaconic anhydride, glutaconic acid, monoalkyl glutaconate, dialkyl glutaconate, glutaconic anhydride, vinyl sulfonic acid, alkyl sulfonic acid, ethylene sulfonic acid, 2-acrylamido-1-methyl propane sulfonic acid,

Assignees

• Monosol Llc

Inventors

• Souter Philip Frank
• Keuleers Robby Renilde Francois
• Labeque Regine
• Courchay Florence Catherine
• Renmans Marc Rene Bert
• Lee David M
• Friedrich Steven G
• Yeung Lee K
• Nii Shinsuke

Classifications

• C07C57/145

  Maleic acid · CPC title

• C08K5/053

  Polyhydroxylic alcohols · CPC title

• C11D17/043 Primary

  Liquid or thixotropic (gel) compositions · CPC title

• B65D53/06

  Sealings formed by liquid or plastic material · CPC title

• B65D65/46

  Applications of disintegrable, dissolvable or edible materials · CPC title