GB547732A - Manufacture of synthetic resins - Google Patents

Abstract

547,732. Synthetic resins. DU PONT DE NEMOURS & CO., E. I. Dec. 2, 1940, No. 17171. Convention date, Nov. 30, 1939. [Class 2 (iii)] [Also in Group. V] Water-insoluble, resinous materials having anion exchange properties are obtained by reacting chlorine-containing high molecular organic compounds at a temperature between 30-350‹C., preferably 45-270‹C., with ammonia or an acyclic amine having at least two hydrogen atoms attached to ammonia-type nitrogen, there being at least one ammonia-type nitrogen atom for each chlorine atom and the reaction being continued until at least 1 per cent. of chlorine is replaced by amino or substituted amino groups. The chlorine-containing compounds are either (a) high molecular olefine polymers in which chlorine is present in the original monomer or introduced after polymerization and (b) chlorinated rubber ; examples of (a) are chlorinated polymethyl methacrylate, polyvinyl chloride, chlorinated polyvinyl chloride, poly- 1 : 2-dichloroethylene, chloroprene and chlorinated chloroprene. The organic amine preferably contains a plurality of nitrogen atoms separated by a chain of at least six contiguous carbon atoms; specified amines are ethylenediamine, diethylenetriamine, triethylenetetramine, propylenediamine N.N<SP>1</SP>. dimethylhexamethylene diamine,N-methylhexamethylenediamine, bis (N-methylaminoethyl) amine, tris (beta aminoethyl) amine, bis (hexamethylene) triamine, decamethylenediamine and bis-decamethylenetriamine. Acid acceptors i.e. basic metallic oxides and hydroxides e.g. calcium oxide, and organic' bases e.g. dimethylaniline, pyridine or quinoline may be present during the reaction which may be accelerated by the use of catalysts e.g. calcium iodide, potassium iodide, cupric chloride or potassium bromide. In examples (1) chlorinated polymethyl methacrylate, obtained by passing chlorine into a solution of polymethylmethacrylate in tetrachlorethane containing a little bromine, at 95‹C., is reacted with ammonia, under pressure, at 54‹C.; (2) polyvinyl chloride is reacted with ammonia at 150‹C. in the presence of potassium bromide and cupric chloride ; (3) polyvinyl chloride is reacted with ethylenediamine at 90‹C. ; and (4) chlorinated polythene, prepared as described in Specification 471,590, is reacted with hexamethylenediamine at 260‹C. Specifications 461,631, [Group V], and 492,322 also are referred to.