Halogen-resistant composition
AssigneeMonosol, LLC
InventorsAndrew P. Verrall, Stephen D. Goodrich
Life of this patent
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Abstract
A water-soluble, halogen-resistant film-forming composition useful for packaging water treatment products is disclosed. The film can include an acid-stable, water-soluble polyvinyl alcohol polymer, an oxidizable organic material, a chelating agent, a free radical scavenger, and secondary additives such as plasticizers, lubricants, and surfactants. The resulting film has favorable solubility properties after having been exposed to halogenated (e.g., chlorinated and brominated) compositions such as water treatment and agricultural products for prolonged periods of time.
Claims25
A halogen-resistant film composition, comprising:
- a mixture of
- an acid-stable, water-soluble polyvinyl alcohol polymer;
- an oxidizable organic material;
- a chelating agent selected from the group consisting of phosphonic acids, phosphonates, polyphosphates, polyaminocarboxylic acids, and combinations thereof;
- and
- a free radical scavenger;
- wherein the mixture is in the form of a water-soluble film.
A halogen-resistant composition, comprising:
- a water-soluble film, the water-soluble film comprising a mixture of
- an acid-stable, water-soluble polyvinyl alcohol polymer;
- an oxidizable organic material,
- a chelating agent selected from the group consisting of phosphonic acids, phosphonates, polyphosphates, polyaminocarboxylic acids, and combinations thereof, and
- a free radical scavenger;
- wherein the water-soluble film is characterized by an increase in dissolution time of not more than 15% for a 50 μm film stored in contact with a reactive halogenated composition including 56 wt. % sodium dichloroisocyanurate as the active ingredient for 28 days at 38° C. and 85% relative humidity and then measured in water at 10° C.
A halogen-resistant film composition, comprising:
- a mixture of
- an acid-stable, water-soluble polymer comprising polyvinyl alcohol substituted with a stabilizing functional group selected from the group consisting of sulfonic acid, sulfonic acid alkali metal salts;
- carboxylic acid, carboxylic acid alkali metal salts;
- amine;
- amide;
- cationic nitrogen;
- and, combinations thereof;
- an oxidizable organic material selected from the group consisting of polyethylene glycol, methoxypolyethyleneglycol, polypropylene glycol, reducing sugars, glucose, fructose, maltose, glyceraldehyde, and combinations thereof;
- a chelating agent selected from the group consisting of phosphonic acids, phosphonates, polyphosphates, polyaminocarboxylic acids, and combinations thereof;
- and
- a free radical scavenger selected from the group consisting of 4-methoxy phenol, hydroquinone, ascorbic acid, butylated hydroxyanisole, mercaptopropionic acid, N-acetylcysteine, dimethylthiourea, pyrrolidine dithiocarbamate, hydroxylamines, monoterpene ketones, and combinations thereof:
- wherein the mixture is in the faun of a water-soluble film.
Dependencies are inferred from the claim text.