Water-soluble polyvinyl alcohol blend film, related methods, and related articles

An article comprising:

• a. a water-soluble film, wherein the water-soluble film comprises:
• a polyvinyl alcohol (PVOH) resin blend comprising:
• a first PVOH copolymer comprising an anionic monomer unit, the first PVOH copolymer having a first 4% solution viscosity at 20° C. (μ1);
• and
• a second PVOH polymer consisting essentially of vinyl alcohol monomer units and optionally vinyl acetate monomer units, the second PVOH polymer having a second 4% solution viscosity at 20° C. (μ2);
• wherein:
• (A) an absolute viscosity difference |μ2−μ1| for the first PVOH copolymer and the second PVOH polymer is in a range of 0 cP to about 10 cP, and the first PVOH copolymer is present in an amount in a range of about 30 wt. % to about 90 wt. % of total PVOH polymers and PVOH copolymers in the film;
• or
• (B) an absolute viscosity difference |μ2−μ1| for the first PVOH copolymer and the second PVOH polymer is in a range of 0 cP to about 10 cP, and the anionic monomer unit is present in the film in an amount in a range of about 1.0 mol. % to about 4.2 mol. % of total PVOH polymers and PVOH copolymers in the film;
• or
• (C) the second viscosity μ2 is about 20 cP or less, and the first PVOH copolymer is present in an amount in a range of about 30 wt. % to about 90 wt. % of total PVOH polymers and copolymers in the film;
• or
• (D) the second viscosity μ2 is about 20 cP or less, and the anionic monomer unit is present in the film in an amount in a range of about 1.0 mol. % to about 4.2 mol. % of total PVOH polymers and PVOH copolymers in the film;
• or
• (E) the first PVOH copolymer is present in an amount in a range of about 30 wt. % to about 70 wt. % of total PVOH polymers and PVOH copolymers in the film;
• and
• b1. a household care composition proximal to the film, wherein the first PVOH copolymer is present in an amount of at least 65 wt. % of total PVOH polymers and PVOH copolymers in the film;
• or
• b2. a composition other than a household care composition proximal to the film;
• or
• b3. a household care composition proximal to the film, wherein the first PVOH copolymer is present in an amount of less than 65 wt. % of total PVOH polymers and PVOH copolymers in the film;
• wherein the household care composition is selected from the group consisting of liquid detergent compositions, hard surface cleaning compositions, laundry detergent gels, bleach and laundry additives, fabric enhancer compositions, shampoos, body washes, and combinations thereof.