Methods of making water-soluble film with resistance to solubility prior to being immersed in water
AssigneeThe Procter & Gamble Company
InventorsJoshua Maurer, Frank DeNome, Bruno Matthys, Hanif Badouraly
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Abstract
A water-soluble film that is resistant to contact with small amounts of water and methods of making the same from water-soluble film-forming compositions, such as polyvinyl alcohols having a salt applied to a surface of the film and a method of making articles made therefrom.
Claims20
A method of making a water-soluble film that is resistant to solubility prior to being immersed in water, said method comprising the steps of:
- (a) forming a water-soluble film having a first surface and a second surface;
- and
- (b) applying a salt to at least one of said surfaces of said film.
A method of making a water-soluble film that is resistant to solubility prior to being immersed in water, said method comprising the steps of:
- (a) providing a water-soluble film having a first surface, a second surface, and a thickness between said first and second surfaces;
- (b) wetting at least a portion of at least one of said first surface and said second surface with a wetting means to at least partially solubilize an outer portion of the surface of the film part of the way into the thickness of the film to form a solubilized portion of said film;
- (c) applying a salt to at least a portion of said solubilized portion of said film;
- and
- (d) drying, or permitting said solubilized portion of said film with said salt thereon, to dry.
A method of making a water-soluble film that is resistant to solubility prior to being immersed in water, said water soluble film comprising a first surface and a second surface, said method comprising the steps of:
- (a) providing a first water-soluble film-forming composition, said first film-forming composition comprising a first concentration of a salt;
- (b) forming a first film from said first water-soluble film-forming composition;
- (c) providing a second water-soluble film-forming composition, said second film-forming composition comprising less salt than said first water-soluble film-forming composition, or being substantially free of salt;
- and
- (d) forming a second film from said second water-soluble film-forming composition, wherein said second film is combined with said first film so that said first film forms one of said first surface and said second surface.
Dependencies are inferred from the claim text.