Patent GB-935125-A (GB)
Title: Coloured articles of poly-ªá-olefins
Inventor: O'NEIL WILLIAM ALEXANDER
IPC: C08K5/00
Filed: 1961-03-02
Abstract: Shaped articles of poly-a -polyolefins in which there is incorporated an anionic exchange substance containing a metal of Group IIa, IIb or IVb are dyed with a dyestuff containing an acidic group or assembly of groups having a low degree of ionization and through which a salt or chelate compound of the metal with the dyestuff is formed.  The acid group may be a phenolic hydroxyl or carboxylic acid group and should have an acidic dissociation constant less than 10-2 in water at 20 DEG C.  The anionic exchange substances may be oxides, hydroxides, salts or complexes of Mg. Ca, Sr, Ba, Cd, Zn, Sn or Pb and may be polymeric.  The preferred articles to be dyed are fibres or filaments of a polymer or copolymer of a stereoregular polypropylene preferably isotactic polypropylene.  Polymers and copolymers of 3-methyl-butene-1, 4-methylpentene-1 and 3,3,5-trimethylhexene-1 are also specified.  The anionic exchange substance may be added to the polyolefin immediately prior to melt-spinning and the substance so incorporated advantageously has a favourable influence on the stability or extrusion of polyolefins. Specified substances are magnesium oxide xerogel, calcium oxide, hydroxyapatite, calcium oleate, calcium resinate, strontium oxide, barium and zinc hydroxides, zinc strearate, zinc oleate, basic zinc nitrate, zinc naphthenate, stannous stearate, lead stearate, zinc complex of 8-hydroxyquinoline, the substance prepared by treating silica successively with solutions of an alkaline earth metal hydroxide and an alkali metal stearate, and a polymer prepared by heating together dimethyl terephthalate, ethylene glycol and zinc acetate and distilling off methyl acetate.  All the above additives are ground to a particle size below 10m  and incorporated into the polyolefin to an extent of about 5% by weight.  The polyolefins may also contain or have chemically combined therewith small amounts of other polymers such as polyesters, polyamides or vinyl polymers.  In Example 1 isotactic polypropylene containing 5% of various anion exchange substances is melt spun, drawn over a heated pin and plate to a draw ratio of 8:1 and cut into staple.  Specifications 790,195, 799,392, 799,823, 801,031, 810,023, 822,080, 828,791, 842,872, 849,181, 873,830 and 875,758 are referred to.ALSO:Shaped articles of poly-a -polyolefins in which there is incorporated an anionic exchange substance containing a metal of Group IIa, IIb or IVb are dyed with a dyestuff containing an acidic group or assembly of groups having a low degree of ionization and through which a salt or chelate compound of the metal with the dyestuff is formed.  The acid group may be a phenolic hydroxyl or carboxylic acid group and should have an acidic dissociation constant less than 102 in water at 20 DEG C. The anionic exchange substances may be oxides, hydroxides, salts or complexes of Mg, Ca, Sr, Ba, Cd, Zn, Sn or Pb and may be polymeric. The preferred articles to be dyed are fibres or filaments of a polymer or copolymer of a stereoregular polypropylene preferably isotactic polypropylene.  Polymers and copolymers of 3-methyl-butene-1, 4-methylpentene-1 and 3,3,5-trimethylhexene-1 are also specified.  The anionic exchange substance may be added to the polyolefin immediately prior to melt-spinning and the substance so incorporated advantageously has a favourable influence on the stability or extrusion of polyolefins.  Specified substances are magnesium oxide xerogel, calcium oxide, hydroxyapatite, calcium oleate, calcium resinate, strontium oxide, barium and zinc hydroxides, zinc stearate, zinc oleate, basic zinc nitrate, zinc naphthenate, stannous stearate, lead stearate, zinc complex of 8-hydroxyquinoline, the substance prepared by treating silica successively with solutions of an alkaline earth metal hydroxide and an alkali metal stearate, and a polymer prepared by heating together dimethyl terephthalate, ethylene glycol and zinc acetate and distilling off methyl acetate.  All the above additives are ground to a particle size below 10m  and incorporated into the polyolefin to an extent of about 5% by weight.  The polyolefins may also contain or have chemically combined therewith small amounts of other polymers such as polyesters, polyamides or vinyl polymers.  Suitable dyestuffs are from the anthraquinone, azo, formazan, azomethine, oxazine and arylazo-8-hydroxy-quinoline series.  In particular dyestuffs which permit chelate formation such as o,o1-dihydroxyazo alizarin, o-hydroxycarboxylic, o-hydroxyketone, ohydroxyaldehyde, o-hydroxyketoxime, ohydroxyaldoxime, o-hydroxyisonitroso and o,o1-dihydroxyazomethine dyestuffs may be used.  In addition azo dyes may be formed in situ from a component containing a weakly acidic group (as already defined) through which a chelate of the metal is formed, for example, polypropylene fibres containing the metallic compound is treated with b -oxynaphthoic acid and then with p-nitroaniline followed by diazotization and coupling.  The present process may be applied to isotactic polypropylene fibres alone or combined with wool, cotton or viscose in such forms as bulked yarns, carpets, blankets, wearing apparel and furnishing and other fabrics. Examples are given in which are very large numbers of suitable dyestuffs are specified. Specifications 790,195, 799,392, 799,823, 801,023, 810,023, 822,080, 828,791, 842,872, 849,181, 873,830 and 875,758 are referred to.