Impact-resistant polyamide moulding compsns. - contain added butadiene! (co)polymer substrate grafted with (meth)acrylic! acid ester and opt. (meth)acrylaminde! and (meth)acrylonitrile!

摘要

Polyamide moulding compsns. consist, by wt., of (1) 40-99.5 (60-95)% polyamides, (I), having relative viscosity 2.3-5 (measured in 1% m-cresol soln. at 25 degrees C) and (2) 0.5-60 (5-40)% graft prod., (II), prepd. from, by wt., (a) 34-95 (50-90)% crosslinked polymer of butadiene, opt. contg. up to 40% styrene and/or acrylonitrile and/or acrylic acid ester, as graft substrate, and (b) 5-66 (10-50)% grafting uniis consisting of (i) 3-100 (10-100) wt.% (meth)acrylic acid ester, (ii) 0-80 (0-60)% (meth)acrylamide, and (iii) 0-80 (0-60)% (meth)acrylonitrile. Sums (I) + (II), (a) + (b) and (i) + (ii) + (iii) each make up 100%. The compsns. are used esp. in prodn. of injection-moulded articles. Addn. of (II) improves impact strength and notch impact resistance of (I), esp. at low temps.; increases resistance to oxidative degradation at higher temps. and homogeneity of mixt.