FIELD: biochemistry.
SUBSTANCE: invention relates to the use of a compound of structural formula R1CO2-R2CO2-Zn2+ as a catalyst for the copolymerisation of a mixture of a carboxylic acid anhydride and an oxirane. Each of R1 and R2 independently of one another, is a linear or branched alkyl group, where R1 and R2 independently of one another, are n-heptyl, 1-methyl-n-hexyl, 2-methyl-n-hexyl, 3-methyl-n-hexyl, 4-methyl-n-hexyl, 5-methyl-n-hexyl, 3-ethyl-n-pentyl, 2-ethyl-n-pentyl, 1,1-dimethyl-n-pentyl, 2,2-dimethyl-n-pentyl, 3,3-dimethyl-n-pentyl, 4,4-dimethyl-n-pentyl, 1,2-dimethyl-n-pentyl, 1,3-dimethyl-n-pentyl, 1,4-dimethyl-n-pentyl, 2,3-dimethyl-n-pentyl, 2,4-dimethyl-n-pentyl, 3,4-dimethyl-n-pentyl, 1,1,2-trimethyl-n-butyl, 1,1,3-trimethyl-n-butyl, 1,2,3-trimethyl-n-butyl, 1,2,2-trimethyl-n-butyl, 2,2,3-trimethyl-n-butyl, 2,3,3-trimethyl-n-butyl, 1,3,3-trimethyl-n-butyl, 1-ethyl-1-methyl-n-butyl, 1-ethyl-2-methyl-n-butyl, 1-ethyl-3-methyl-n-butyl, 2-ethyl-1-methyl-n-butyl, 2-ethyl-2-methyl-n-butyl, 2-ethyl-3-methyl-n-butyl, 1-isopropyl-n-butyl, 2-isopropyl-n-butyl, 1,1,2,2-tetramethyl-n-propyl, 1,1-diethyl-n-propyl, 2,2-dimethyl-1-ethyl-n-propyl, 1,2-dimethyl-1-ethyl-n-propyl, 1-isopropyl-1-methyl-n-propyl or 1-isopropyl-2-methyl-n-propyl, C6-alkyl, C8-alkyl, C9-alkyl or C10-alkyl. Also disclosed are an electrical insulation tape, an electrical insulating sheath for an electric wire and a seal for the winding of a rotating electric machine.
EFFECT: use of said compound enables to achieve constant impregnation parameters of the electrical insulating tape, which makes it possible to obtain an insulating sheath and a sealant of constant quality.
11 cl, 4 ex
