GB1410007A - Polyamide - Google Patents

Abstract

1410007 Polyamides BP CHEMICALS INTERNATIONAL Ltd 15- Sept 1972 [15 Sept 1971] 42969/71 Heading C3R A polyamide comprises (a) residues of an aromatic or alicyclic diacid where n is 0 or 1 and the ring is unsubstituted or substituted by methyl, and (b) diamine residues comprising (I) 10 to 40 mol. per cent of residues of isophorone diamine, (II) over 20 and up to 80 mol. per cent of residues of a diamine where q to w total not more than 20 and R<SP>1</SP> to R<SP>4</SP> are each H or methyl at least 2 thereof attached to the same carbon atom being methyl, and (III) 10 to 50 mol. per cent of residues of a diamine where 4#x+y+z#12 and R<SP>5</SP> and R<SP>6</SP> are H or methyl, the specified acid residues (a) constituting at least 80 mol. per cent of the total diacid residues and the specified residues (b) constituting at least 90 mol. per cent of the total diamine residues. The selected range of proportions of the specified residues and restriction on unspecified residues is stated to result in polymers of high impact strength while retaining good overall mechanical properties. Any balance of acid residue may be those of adipic, suberic, sebacic or dodecanoic acid or a 1,2- or 1,3-isomer of the acids (a). Up to 15 mol. per cent of residue of amino acids or lactams may also be included, e.g. capro- or dodecano-lactam or 6-amino caproic or 11-amino undecanoic acid. Conventional additives such as stabilizers, e.g. trihydrocarbyl phosphites, ammonium hypophosphite or the stearyl ester of 3-(4-hydroxy- 3,5 - di - t - butyl phenyl) propionic acid, and plasticizers, e.g. N-butyl benzene sulphonamide, may be incorporated with the polymer during or after its preparation. In the specific examples residues (a) are those of terephthalic acid; (b) (II) of trimethyl hexamethylene diamine; and (b) (III) of dodeca- or hexa-methylene diamine. Example 6 also includes 10% of caprolactam residues. Reference is made to Specifications 905,475; 1,096,908; 1,100,972; 1,132,039; 1,176,985; 1,228,761; 1,255,483; and 1,266,864.