PROCEDIMIENTO EN UNA SOLA ETAPA PARA LA OBTENCION DE COMPO-SICIONES TERMOPLASTICAS.

摘要

1,241,623. Polyamide and polyolefin composition. SOC. RHODIACETA. 21 March, 1969 [22 March, 1968], No. 15129/69. Headings C3P and C3R. A thermoplastic composition T comprises, as the sole polymeric constituents, 50-99% wt. polyamide A and 50-1% wt. polyolefine B dispersed as <5 um. diameter particles in A. A is formed from diacid(s) C and di-primary diamine(s) D. Polyamide A may have units -[-CO-R1-CO-NH-R2-NH-]- where R1 =(CH 2 ) 4-8 and R2 is (CH 2 ) 2-10 or p-phenylene; R1 + R2 together contain > 8 C atoms ; examples of A are polyhexamethyleneadipamide, sebacamide, azelamide or terephthalamide. Polyolefine B may be a linear polymer or copolymer of E: and/or of F: where R3 is C 3-16 alkyl, phenyl, phenylalkyl, or alkylphenyl, and R4 and R5 are each H or C 1-4 alkyl; or R3 and R5 together make up a C 3 -8 polymethylene chain which may be substituted by C 1-4 alkyl; and R6, R7 and R8 are each H or C 1-4 alkyl, or R6+R8 make up a C 1-8 (poly)- methylene chain. Examples of monomers forming B are: styrene,α-methylstyrene, vinyltoluene, cyclohexene, cyclopentadiene, 1,3- cyclo-octadiene, 1-hexadecene, 1-dodecene, 1- nonene, 1-hexene, 2-methylbutadiene, and 1- phenyl-2-butene. T may be made by simultaneous polymerization and polycondensation by heating the olefinic monomer(s) in an aqueous solution of the salt(s) S, formed from C with D, at 180-320‹ C., and 10-50 kg./cm.2 with removal of water. The concentration of S in the solution may be 20-85% wt. Also present may be a polymerization catalyst, e.g. a peroxide, azodiisobutyronitrile, or a redox system. The process may be continuous or discontinuous. Fillers, pigments, dyestuffs or stabilizers may be added to the starting solution. In comparative examples, polyolefin particles incorporated in polyamides by known methods have diameter 10-35 Ám.