Process for colouring a polyolefinic shaped article containing a metal compound

摘要

Monoazo dyes of general formula in which R is a hydrogen atom or an alkyl group of 1-4 carbon atoms, A is an aromatic ring having a hydroxyl group in the ortho-position to the azo group and is a benzene ring or a naphthalene ring, B is an aromatic ring having an -NHR group in the ortho position to the azo group and is a benzene ring or a naphthalene ring, and A and B may contain halogen or an alkyl, alkoxy, nitro or acyl group as substituent, are prepared by diazotizing an amine of formula and coupling with a coupling component of formula The dyes give red-brown-blue shades on metal modified polyolefines.ALSO:Polyolefinic articles containing a dissociable compound of a transition metal are obtained by incorporating into a polyolefinic resin at least 0.01% by weight of the transition metal compound, melting the resin and melt spinning to form a fibre. In examples, nickel stearate, nickel palmitate, and nickel naphthenate are incorporated in polypropylene fibres by melt spinning.ALSO:Shaped articles of polyolefines obtained by extrusion of the polymer in molten condition and containing a dissociable transition metal compound in an amount of at least 0.01% by weight are coloured by employing a dye of the formula: wherein R is H or a 1-4C alkyl, A is a benzene or natphthalene ring having an -OH ortho to the azo group, B is a benzene or naphthalene ring having the -NHR ortho to the azo group and A or B may be further substituted with halogen, alkyl, alkoxy, nitro or acyl groups. The preferred metals are Cu, Zn, Fe, Co and Ni which may be present as salts or organic acids or as organic complexes. The polyolefines may be homopolymers or graftcopolymers and may contain other polymers as well as other usual additives. A number of dyes are specified and examples are given.