Modified polyurethane, process for the production thereof and use thereof

摘要

Modified polyurethane comprises (i) at least one polyurethane from organic polyisocyanates, polyols and optionally chain lengtheners ands/or crosslinkers, (ii) at least one polymer modifier consisting of at least one graft rubber dispersible and swellable in organic polyisocyanates, having a particle form structure which comprises up to 20-80 wt.% of a rubber polymerisate of glass transition temperature below 0 degrees C, and (iii) grafted vinyl and/or acrylic monomers the remainder. An Independent claim is included for a method of preparing the modified polyurethane optionally in the presence of a catalyst by reaction of: (a) a polyisocyanate component consisting of (a1) at least one modified organic polyisocyanate of NCO content 5-50, preferably 15-48 wt.%, (a2) optionally conventional adjuvants and additives with (b) a polyol component consisting of (b1) at least one component selected from long chain polyethers, polyetheramines, and polyesters of OH-functionality 2-6 and number average molecular weight 1000-12000 g/mole (Dalton), (b2) optionally at least one component selected from: short chain polyols and polyamines of OH- or NH-functionality 2-6 and molecular weight 60-600, (b3) optionally other adjuvants and additives, with addition of (c) at least one polymer modifier consisting of at least one graft rubber dispersible and swellable in component (a1) as above, and (d) at least one filler which is soluble in plastic electroplating etching solutions, of mean particle size 0.02-0.5, micron and bulk density 170-500 kg/cubic m.