| abstract |
FIELD: organic chemistry, chemistry of polymers, chemical technology. n SUBSTANCE: invention relates to using hydroxylamine esters for decreasing molecular mass of polypropylene, propylene copolymers or polypropylene mixtures. Method involves addition to propylene polymers subjected for destruction at least one hydroxylamine ester chosen from group including compound of the formula (IA): wherein n means 1; R a means aliphatic carboxylic acid acyl radical comprising from 2 to 18 carbon atoms; R' 1 , R' 2 and R' 3 mean independently of one another hydrogen atom or methyl group; G means aliphatic carboxylic acid acyl-acyl radical comprising from 1 to 18 carbon atoms or aromatic carboxylic acid acyl-acyl radical comprising from 7 to 18 carbon atoms of the formula (IB): wherein n means 1; R a means aliphatic carboxylic acid acyl radical comprising from 2 to 18 carbon atoms; each R' 1 , R' 2 and R' 3 means independently of one another hydrogen atom or methyl group; G 1 means hydrogen atom, (C 2 -C 18 )-alkanoyl; G 2 means hydrogen atom, (C 1 -C 8 )-alkyl, aliphatic carboxylic acid acyl-acyl radical comprising from 1 to 18 carbon atoms of the formula (IC): wherein n means 1; R a means aliphatic carboxylic acid acyl radical comprising from 2 to 18 carbon atoms; each R' 1 , R' 2 and R' 3 means independently of one another hydrogen atom or methyl group; G means (C 2 -C 8 )-alkylene, (C 4 -C 22 )-acyloxyalkylene or aliphatic carboxylic acid acyl radical comprising from 1 to 18 carbon atoms and this mixture is heated to temperature below 280°C. Addition of hydroxylamine esters results to increasing the destruction degree of used polypropylene polymer that is reflected by the melt efflux velocity value in comparison with this index of the parent polymer. n EFFECT: improved method for molecular mass decreasing. n 3 cl, 15 tbl |