METHOD OF PREPARING POLYMER BLENDS FROM AMINONITRILE AND THERMOPLASTIC POLYMERS Russian patent published in 2003 - IPC

FIELD: polymer production. SUBSTANCE: polymer blends are prepared by reaction of at least one amononitrile with water in presence of thermoplastic polymers selected from polyarylene ethers, polyimidoethers, polyimidoamides, styrene homo- and copolymers, rubber-elastic graft copolymers, ethylenic copolymers, polyamides prepared from dicarboxylic acids and diamines and mixtures thereof. Method comprises: (i) reaction of at least one aminonitrile with water at 90 to 400 C and pressure 0.1 to 35 x 10⁶ Pa to form reaction mixture; (ii) further conversion of reaction mixture at 150-400 C and pressure that is inferior to that in precedent step, temperature and pressure being selected such as to form first gas phase and first liquid phase or first solid phase or mixture of first solid and first liquid phases, and first gas phase being separated from first liquid phase or first solid phase or from mixture of first solid and first liquid phases; and (iii) decomposition of first liquid or first solid phase or mixture of first solid and first liquid phases by gaseous or water-containing liquid phase at 150 to 370 C and pressure 0.1 to 30 x 10⁶ Pa to give polymer blend. In one or in several reaction steps, thermoplastic polymers are added and, in some cases, other polyamide-forming monomers. In the step (i), reaction is carried out in presence of Broensted acid catalyst selected from betazeolite, laminated silicate, and titanium dioxide consisted of 70-100 wt % anatase form and 0-30 wt % rutile form and in which up to 40 wt % titanium dioxide can be substituted with tungsten oxide. EFFECT: eliminated formation of by-products and enabled preparation of light-colored compositions. 8 cl, 2 tbl, 6 ex