GB1284489A - Thermoplastic polymer blends - Google Patents

Abstract

1284489 Polyamide-ethylene copolymer compositions IMPERIAL CHEMICAL INDUSTRIES Ltd 19 April 1971 [16 March 1970] 12543/70 Headings C3P and C3R Thermoplastic polymer blends comprise (1) a polyamide and (2) a copolymer of (a) 40 to 95 weight per cent of ethylene, (b) 2 to 50 weight per cent of a R<SP>1</SP>R<SP>2</SP>N-substituted aliphatic or alicyclic ester of an α,#-unsaturated acid having 3 to 6 carbon atoms, the aliphatic or alicyclic radical in said ester containing 2 to 10 carbon atom and R<SP>1</SP> and R<SP>2</SP> being hydrogen, aliphatic or alicyclic radicals containing 1 to 10 carbon atoms or together with the N atoms forming a saturated heterocyclic ring, and (c) 0 to 55 weight per cent of an olefinically unsaturated monomer copolymerizable with (a) and (b), the sum of (b) and (c) constituting 5 to 60 weight per cent of the copolymer and the blend having a melting point or softening range not substantially lower than that of the unblended polyamide. Many polyamide precursors are listed and specified polyamides which are preferably amineended are polyhexamethylene adipamide, polypyrrolidone, polycaprolactam, polyundecanolactam, polydodecanolactam, polyhexamethylene azelaiamide, polyhexamethylene sebacamide, polyhexamethylene isophthalamide, polymetaxylylene adipamide, and hexamethylene adipamide/caprolactam, hexamethylene adipamide/isophthalamide, hexamethylene adipamide/terephthalamide, trimethylhexamethylene/hexamethylene oxamide, hexamethylene adipamide/azelaiamide and hexamethylene adipamide/azelaiamide/caprolactam copolymers. The ester may be an amino substituted alkyl or cycloalkyl ester of acrylic or methacrylic acid, optionally containing hydroxy or epoxy substituents. The comonomer (c) may be an olefin, styrene, a vinyl ether, methacrylamide, acrylonitrile, N-vinyl carbazole, vinyl chloride, vinyl acetate, vinyl formate, vinyl propionate, vinyl benzoate, methyl acrylate, ethyl acrylate or methylmethacrylate. The polyamide may be nucleated, e.g. with talc, calcium fluoride, graphite, sodium phenyl phosphinate, alumina, high melting polyamides and polytetrafluoroethylene; and may be crosslinked by incorporating diphenyl carbonate. The compositions may also contain polymers of ethylene, propylene, butadiene and/or styrene, fillers, pigments, stabilizers, molecular weight regulators, chain extenders and delustrants. Examples describe compositions comprising polyhexamethylene adipamide and (1) ethylene / dimethylaminoethyl methacrylate (DMAEMA) copolymer (2, 3 and 5) ethylene/ DMAEMA/vinyl acetate copolymer, (7) ethylene / t - butylaminoethyl methacrylate copolymer and (8) ethylene/DMAEMA/methyl methacrylate copolymer; and comprising ethylene / DMAEMA / vinyl acetate copolymers and (4) polyhexamethylene adipamide/ isophthalamide and (6) polyhexamethylene adipamide nucleated with talc.