| abstract |
(57) [Problem] To provide a cosmetic preparation such as a pharmaceutical preparation for external use (for example, a base for a patch), a pack, etc. Provided is a highly safe gel body that can be used as a medical device such as a biological adhesive, a biological electrode, a wound protectant, a therapeutic pad, and a daily necessity such as an aromatic and an adhesive. SOLUTION: An N-vinylacetamide copolymer (N-vinylacetamide copolymer) comprising, as main components, N-vinylacetamide and a polymerizable monomer having a COOM group (wherein M represents a hydrogen atom, an alkali metal or an ammonium group). A component) 0.5 to 6 A cross-linking product of 0 parts by mass and 0.01 to 20 parts by mass of a crosslinking agent (component B) that reacts with and crosslinks the COOM group of component A, and 94.49 to 20 parts by mass of water (component C) (components A to C) The total of the components is 100 parts by mass.) To 10.5. |