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1. 发明公开

US20230357576A1 DYE-CONTAINING WATER-SOLUBLE RECEPTACLE AND METHOD FOR PRODUCING A COLOURED AQUEOUS ALKALI METAL CYANIDE SOLUTION 审中-公开
公开(公告)号：US20230357576A1
公开(公告)日：2023-11-09
申请号：US18041892
申请日：2021-08-17
申请人： CYPLUS GMBH
发明人： Torsten SILL , Bernd SCHMIDT , Lena MEGATIF , Bernd SCHUMACHER , Murillo VILLELA FILHO
IPC分类号： C09B67/02 , C08F216/06 , B65D65/46
CPC分类号： C09B67/0097 , B65D65/46 , C08F216/06
摘要： 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 comprises

vinyl alcohol repeating units,
vinyl ester repeating units and
repeating 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/or

b) 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; and
wherein 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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