Process for the preparation of a non-aqueous dispersion of thermoplastic resin

Claim 1

A non-aqueous resin dispersion containing a graft-copolymer and at least one substance selected from the group consisting of wax or polyethylene having a softening point of 60° to 130° C, dispersed in an organic solvent having a high resistivity and a low dielectric constant, said non-aqueous resin dispersion having been prepared by carrying out successively the following four steps (a), (b), (c) and (d) in said organic solvent, at an elevated temperature, adding said wax or polyethylene in one of the four steps and dissolving it in the solvent, and cooling the reaction product of step (d) while stirring vigorously: a. copolymerizing from 99.9 to 80 parts by weight of a monomer having the formula (I) ##STR4## wherein R is hydrogen or methyl, A is --COOC n H 2n +1 or --OC n H 2n +1 , and n is an integer of from 6 to 20, with from 0.1 to 20 parts by weight of at least one co-monomer selected from the group consisting of an unsaturated carboxylic acid, glycidyl acrylate and glycidyl methacrylate; b. esterifying 100 parts by weight of the copolymer obtained in step (a) with from 0.1 to 20 parts by weight of glycidyl acrylate or glycidyl acrylate when said copolymer has been prepared by using an unsaturated carboxylic acid, or esterifying 100 parts by weight of the copolymer obtained in step (a) with from 0.1 to 20 parts by weight of said unsaturated carboxylic acid when said copolymer has been prepared by using glycidyl acrylate or glycidyl methacrylate; c. grafting 100 parts by weight of the esterified copolymer obtained in step (b) with from 5 to 100 parts by weight of a monomer having a vinyl group; d. polymerizing 100 parts by weight of the graft copolymer obtained in step (c) with from 0.1 to 20 parts by weight of a compound selected from the group consisting of maleic acid, furmaric acid, allylamine, vinylamine, aroyl alcohol, vinylsulfonic acid, vinyl phosphate and a vinyl monomer having the formula ##STR5## wherein R is hydrogen or methyl, and B is ##STR6## wherein m and m' are integers from 1 to 4, ##STR7## and wherein the amount of said wax or polyethylene added is as follows: when added in step (a), from 5 to 50 parts by weight of said wax or polyethylene, per 100 parts by weight of the sum of the weights of said monomer (I) and said co-monomer, when added in step (b), from 5 to 50 parts by weight of said wax or polyethylene, per 100 parts by weight of the copolymer obtained in step (a), when added in step (c), from 1 to 40 parts by weight of said wax or polyethylene, per 100 parts by weight of the esterified copolymer obtained in step (b), and when added in step (d), from 5 to 50 parts by weight of said wax or polyethylene, per 100 parts by weight of the graft copolymer obtained in step (c).