Importance

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Abstract

The invention relates to a water-soluble receptacle which is suitable for accommodating an additive or an additive composition and is filled with an additive or an additive composition comprising at least one dye or at least one dye composition, wherein the water-soluble receptacle has a wall thickness in the range from 5 to 50 µm, and wherein the water-soluble receptacle comprises a water-soluble polymer composition or consists of a water-soluble polymer composition, wherein the polymer composition comprises:

a) at least one polyvinyl alcohol copolymer P1 having a degree of hydrolysis in the range from 75 to 95 mol%, wherein the polyvinyl alcohol copolymer P1 is a copolymer which comprisesvinyl alcohol repeating units,vinyl ester repeating units andrepeating units of at least one comonomer,wherein the at least one comonomer is selected from pentaerythritol acrylate and pentaerythritol acrylate derivatives and also optionally acrylic acid; and/orb) at least one polyvinyl alcohol P2 having a degree of hydrolysis in the range from 87 to 95 mol%;

wherein, in addition to the at least one polyvinyl alcohol copolymer P1 and/or the at least one polyvinyl alcohol P2, the polymer composition can additionally optionally contain additive substances;wherein the polymer composition, in the case in which it comprises at least one polyvinyl alcohol copolymer P1 and no polyvinyl alcohol P2, has a content of repeating units of the at least one comonomer in a range from in total 10% to 20% by weight, based on the total weight of polyvinyl alcohol copolymer P1; andwherein the polymer composition, in the case in which it comprises at least one polyvinyl alcohol copolymer P1 and at least one polyvinyl alcohol P2, has a content of repeating units of the at least one comonomer in a range from in total 10% to 20% by weight, based on the total weight of polyvinyl alcohol copolymer P1 and polyvinyl alcohol P2. The water-soluble receptacle can advantageously be used in a method for producing a coloured aqueous alkali metal cyanide solution. To this end, the water-soluble receptacle can be provided together with an alkali metal cyanide compound in the form of a composition Z1. The invention also relates to a method for producing said composition Z1 and to the use of said composition for producing a coloured aqueous alkali metal cyanide solution (composition Z2).

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First Claim