| 摘要 |
In a process for the production of cross-linked polyamides, at least one molten linear high molecular weight polyamide having a K value between 65 and 100 is kneaded with an addition of 0.1 to 2% by weight of an organic free radical-forming catalyst based on the total weight of the mixture. Specified polyamides are those derived from lactams with from six to twelve ring carbon atoms and dicarboxylic acids and diamines with four to eighteen carbon atoms between the functional groups. Specified catalysts are azo-bis-isobutyronitrile, azo-disulphonates, cumene hydroperoxide, t-butyl hydroperoxide, di-t-butyl peroxide, 2:5-di-t-butyl-2:5-dimethyl hexane, lauroyl peroxide, cyclohexanone peroxide, benzoyl peroxide, peracetic acid, perbenzoic acid, dicumyl peroxide, 3-butyl-4-methyl-4-hydroperoxy-5-dimethyl oxazolidone-2 and the mono-t-butyl ester of diperoxy maleic acid. Pigments, stabilizers, lubricants, mould release agents and low molecular weight polyamides e.g. di-, tri- and tetrameric e -caprolactam may be present in the reaction mixtures. In the examples, cross-linked polyamides are made from:-(1) poly-e -caprolactam and a copolymer of e -caprolactam and hexamethylene adipamide in the presence of di-t-butyl peroxide; (2) poly-e -caprolactam in the presence of cumene hydroperoxide; (3) poly-e -caprolactam and polyethylene diamine oxalate in the presence of di-t-butyl peroxide, calcium stearate and di-iso-octyl adipate; (4) polyhexamethylene adipamide and polyethylene diamine oxalate in the presence of di-t-butyl peroxide; (5) poly-e -caprolactam and a copolyamide derived from the adipic acid salts of hexamethylene diamine and 4:41-diaminodicyclohexyl methane in the presence of 3-butyl-4-methyl-4-hydroperoxy-5-dimethyl oxazolidone-2 and in (b) with a low molecular polyamide derived from ethylene diamine and oxalic acid (nylon-2:2) and (6) polycaprylactam in the presence of calcium stearate, diisocyl adipate and (a), (d) and (e) di-t-butyl peroxide and nylon-2:2; (b) 3-butyl-4-methyl-4-hydroperoxy-5-dimethyl ox-azolidone-2 and nylon-2:2; (c) di-t-butyl peroxide; (f) the mono-t-butyl ester of diperoxy-maleic acid and a mixture of di-, tri- and tetrameric e -caprolactam and (g) di-t-butyl peroxide and a mixture of di-, tri- and tetrameric caprolactam.
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