MALEIMIDE COPOLYMER, PROCESS OF OBTAINING THEREOF AND HEAT-RESISTANT COMPOSITIONS OF RESINS, CONTAINING THEREOF Russian patent published in 2014 - IPC C08F212/04 C08F8/32 C08F222/04 C08F222/40 C08L25/12 C08L35/06 C08L51/04 C08L55/02 

FIELD: chemistry.

SUBSTANCE: invention relates to maleimide copolymer, method of its obtaining and to heat-resistant composition of resin, which contains said copolymer. Maleimide copolymer contains from 50 to 60 wt % of styrene monomer link, from 30 to 49.5 wt % of meleimide monomer link and from 0.5 to 6 wt % of maleic anhydride link. Copolymer has average molecular weight (Mw) from 90000 to 130000 and residual content of maleimide monomer 300 ppm or less. Method of copolymer obtaining includes the following stages. At the first stage copolymer is obtained by reaction of styrene and maleic anhydride polymerisation. The remaining part of maleic anhydride is added to solution, which mainly contains total amount of styrene monomer and part of maleic anhydride, with mixing the solution. At the second stage reaction of styrene/maleic anhydride copolymer imidation is performed under action of primary amine. After carrying out reaction volatile substances are removed from mixed solution, which contains maleimide copolymer, by means of vacuum screw extruder at resin temperature from 310 to 340°C, under lower pressure, equal or lower than -92 kPa relative to atmospheric pressure. Ratio of maleic anhydride quantity, applied at the initial stage of polymerisation, to the remaining amount of maleic anhydride, added continuously or in portions, constitutes from 5/95 to 50/50. Heat-resistant composition of resin contains said maleimide copolymer and one or several resins, selected from group, consisting of ABS resins, AS resins, AES resins and ASA resins.

EFFECT: invention makes it possible to obtain maleimide copolymer with excellent colour, high heat-resistance and excellent processability, as well as to obtain heat-resistant composition with good colour, shock resistance and fluidity.

6 cl, 4 tbl, 27 ex