Plasticizer blend for chlorine stability of water-soluble films

Patent metadata

Field	Value
Publication number	US-10202227-B2
Application number	US-201715665810-A
Country	US
Kind code	B2
Filing date	Aug 1, 2017
Priority date	Aug 1, 2016
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

Disclosed herein are water-soluble films comprising a mixture of a water-soluble polyvinyl alcohol copolymer including an anionic monomer having a pendant carboxyl group, and a plasticizer blend comprising a first plasticizer comprising sorbitol and a secondary plasticizer selected from the group consisting of glycerol, trimethylolpropane, diglycerol, glycerol propylene oxide polymers, glycerol diacetate, 2-methyl-1,3-propanediol and a combination thereof, wherein (i) when the total plasticizer in the film is less than 12 PHR, then the plasticizer blend comprises sorbitol, glycerol, and at least one additional secondary plasticizer; (ii) when the total plasticizer in the film is at least 12 PHR and less than 20 PHR, then the plasticizer blend comprises sorbitol, glycerol, and at least one additional secondary plasticizer selected from diglycerol, trimethylolpropane and a combination thereof; and (iii) when the total plasticizer in the film is 20 PHR or greater, then sorbitol comprises at least ⅓ of the total plasticizer.

First claim

What is claimed:

1. A water-soluble film comprising a mixture of a water-soluble polyvinyl alcohol copolymer, the copolymer including an anionic monomer having a pendant carboxyl group, and a plasticizer blend comprising a first plasticizer comprising sorbitol and a secondary plasticizer selected from the group consisting of glycerol, trimethylolpropane, diglycerol, glycerol propylene oxide polymers, glycerol diacetate, 2-methyl-1,3-propanediol and a combination thereof, wherein
(i) when the total amount of plasticizer included in the film is less than 12 PHR, then the plasticizer blend comprises sorbitol, glycerol, and at least one additional secondary plasticizer;
(ii) when the total amount of plasticizer included in the film is at least 12 PHR and less than 20 PHR, then the plasticizer blend comprises sorbitol, glycerol, and at least one additional secondary plasticizer selected from diglycerol, trimethylolpropane and a combination thereof; and
(iii) when the total amount of plasticizer included in the film is 20 PHR or greater, then the sorbitol comprises at least ⅓ of the total amount of plasticizer (by weight);

wherein the total amount of plasticizer included in the film is less than 12 PHR.

2. The water-soluble film of claim 1 , wherein glycerol is included in the film in an amount of at least 2.0 wt. %, based on the total weight of the film.

3. The water-soluble film of claim 1 , wherein the total amount of plasticizer in the film is at least 2 PHR.

4. The water-soluble film of claim 1 , wherein the total amount of plasticizer is less than about 10 PHR.

5. The water-soluble film of claim 1 , wherein a film having the identical composition and a thickness of about 2 mil (about 0.05 mm), dissolves in 600 seconds or less in water at a temperature of 20° C. (68° F.) in accordance with MonoSol Test Method MSTM-205 after storing in contact with a harsh chemical oxidizing agent for 6 weeks at 23° C. and 35% relative humidity (RH).

6. The water-soluble film of claim 1 , further comprising a filler, a surfactant, an anti-block agent or combinations of the foregoing.

7. The water-soluble film of claim 1 , wherein the anionic monomer comprises monomethyl maleate, the total plasticizer present in the film is in a range of 7 to 8 PHR, and the plasticizer blend consists essentially of glycerol, sorbitol, and diglycerol.

8. The water-soluble film of claim 1 , wherein the anionic monomer comprises monomethyl maleate, the total plasticizer present in the film is in a range of 7 to 8 PHR, and the plasticizer blend consists essentially of glycerol, sorbitol, and trimethylolpropane.

9. The water-soluble film of claim 1 , wherein the total amount of plasticizer in the film is at least 5 PHR.

10. The water-soluble film of claim 1 , wherein the total amount of plasticizer in the film is at least 6.5 PHR.

11. The water-soluble film of claim 1 , wherein the total amount of plasticizer in the film is less than about 8 PHR.

12. The water-soluble film of claim 1 , wherein the total amount of plasticizer in the film is less than about 7.5 PHR.

13. The water-soluble film of claim 1 , wherein the PVOH copolymer comprises a degree of hydrolysis in a range of 89 to 97.

14. The water-soluble film of claim 1 , wherein the PVOH copolymer comprises a degree of hydrolysis in a range 90 to 96.

15. The water-soluble film of claim 1 , wherein the anionic monomer unit is selected from the group consisting of vinyl acetic acid, maleic acid, monoalkyl maleate, dialkyl maleate, monomethyl 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, alkali metal salts of the foregoing, esters of the foregoing, and combinations of the foregoing.

16. The water-soluble film of claim 15 , wherein the anionic monomer unit comprises one or more of maleic acid, monoalkyl maleate, dialkyl maleate, monomethyl maleate, dimethyl maleate, maleic anhydride, alkali metal salts of the foregoing, esters of the forgoing, and combinations thereof.

17. The water-soluble film of claim 16 , wherein the anionic monomer unit is selected from the group consisting of maleic acid, monomethyl maleate, dimethyl maleate, maleic anhydride, alkali metal salts of the foregoing, esters of the foregoing, and combinations thereof.

18. The water-soluble film of claim 1 , wherein the PVOH copolymer comprises a degree of hydrolysis in a range of 87 to 98.

19. The water-soluble film of claim 18 , wherein the PVOH copolymer has a degree of hydrolysis in a range of 94 to 98.

20. The water-soluble film of claim 19 , wherein the PVOH copolymer has a degree of hydrolysis of 96.

21. The water-soluble film of claim 1 , further comprising an antioxidant.

22. The water-soluble film of claim 21 , wherein the antioxidant is selected from the group consisting of sodium metabisulfite, propyl gallate, citric acid, and combinations thereof.

23. A sealed article comprising the water-soluble film of claim 1 .

24. The sealed article of claim 23 , wherein the article is a vertical form, filled, and sealed article.

25. A sealed pouch comprising the film of claim 1 that encloses an oxidizing composition.

26. The sealed pouch of claim 25 , wherein the oxidizing composition is a chlorinated or brominated composition.

27. The sealed pouch of claim 25 , wherein the oxidizing composition comprises an oxidizing agent selected from the group consisting of sodium hypochlorite, calcium hypochlorite, lithium hypochlorite, dichloroisocyanuric acid, trichloroisocyanuric acid, trichloroisocyanurate (TC), salts and hydrates of the foregoing, 1,3-dibromo-5,5-dimethylhydantoin (DBDMH), 2,2-dibromo-3-nitrilopropionamide (DBNPA), dibromocyano acetic acid amide, 1-bromo-3-chloro-5,5-dimethylhydantoin (BCDMH), 2-bromo-2-nitro-1,3-propanediol, and combinations thereof.

28. The sealed pouch of claim 25 , wherein the oxidizing composition comprises an oxidizing agent selected from the group consisting of trichloroisocyanurate, 1-bromo-3-chloro-5,5-dimethylhydantoin, and combinations thereof.

29. The sealed pouch of claim 25 , wherein the pouch is a vertical form, filled, and sealed pouch.

30. The sealed pouch of claim 29 , wherein the pouch has an interior volume of at least about 25 ml.

31. The sealed pouch of claim 29 , wherein the pouch has a length of at least about 12.5 cm (about 5 inches).

32. The sealed pouch of claim 29 , wherein the pouch has an interior volume of at least about 100 ml.

33. The sealed pouch of claim 29 , wherein the pouch has an interior volume of at least about 150 ml.

34. The sealed pouch of claim 29 , wherein the pouch has an interior volume of at least about 200 ml.

35. The sealed pouch of claim 29 , wherein the pouch has an interior volume of at least about 250 ml.

36. The sealed pouch of claim 29 , wherein the pouch has an interior volume of at least about 300 ml.

37. The sealed pouch of claim 29 , wherein the pouch has a length of at least about 18 cm (about 7 inches).

38. The sealed pouch of claim 29 , wherein the pouch has a length of at least about 23 cm (about 9 inches).

Assignees

• Monosol Llc

Inventors

• Nii Shinsuke
• Miranda Nathanael R

Classifications

• C02F2103/42

  from bathing facilities, e.g. swimming pools · CPC title

• C08K5/053

  Polyhydroxylic alcohols · CPC title

• B65D65/46 Primary

  Applications of disintegrable, dissolvable or edible materials · CPC title

• C02F1/687

  Devices for dosing solid compounds · CPC title

• C08J2329/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title