Security element, method for producing the same and value document

A security element for securing value documents, comprising a first polymer containing a feature substance, which is at least partially surrounded by a second polymer,

• wherein the first polymer is a hydrophobic, water-insoluble polymer which, at an elevated pH value and at elevated ambient temperature at a treatment duration of less than 60 minutes, can be converted into a hydrophilic, water-soluble polymer, and the second polymer is a hydrophilic, water-soluble polymer,
• wherein the elevated pH value is greater than 12, and the elevated ambient temperature is greater than 90° C.

The security element according to 20, wherein the second polymer is polyvinyl alcohol or a polyvinyl alcohol copolymer.