The use of bisbenzoxazole stilbenes as fluorescent brightening agents for solid polymeric material

摘要

0.005 to 0.5 wt. per cent of a fluorescent compound as claimed in any of Claims 1 to 8 of Specification 1,072,914 is used as an optical brightener for solid polymeric material. Such compounds fall within the general formula wherein R1 indicates that the rings may be substituted by one or more of halogen, alkyl, aryl, alkaryl, aralkyl, alkoxy, aryloxy, acyl, acyloxy, hydroxyl, amino, substituted amino, quaternized ammonium, sulpho-, substituted sulphonyl, sulphamyl, substituted sulphamyl, cyano thiocyano, thiol carbamyl, substituted carbamyl, carbamyloxy or nitro and Y and Y1 each represent H, alkyl, aryl or cyano. Specified polymeric materials are polyethylene, polypropylene, ethylene-propylene polyallomers; polyesters, e.g. of ethylene or 1,4-cyclohexylenedimethylene glycol and terephthalic acid or naphthalene dicarboxylic acid; acrylonitrile polymers; polyurethanes; rayon; cellulose esters, e.g. acetate, triacetate or acetate-butyrate; and polyamides. In examples the compounds are incorporated in (1) a titanium dioxide and polyethylene terephthalate concentrate which is incorporated in the melt extrusion of polyester fibres; (2) meltextruded fibres of poly(1,4-cyclohexylenedimethylene terephthalate) containing titanium dioxide; (3) to (4) similar polyester and (5) polyamide fibres in woven fabric form by dyeing procedures; (6) injection moulded polyethylene; (7) melt spun copolyester fibre; (8) red cellulose acetate fibre; (9) sheet cellulose acetatebutyrate plasticized with dioctyl phthalate; (10) a fibre spinning solution of a mixture of poly-N-i-propyl acrylamide and an acrylonitrilevinylidene chloride copolymer; (11) and (12) fibres of cellulose esters, polyacrylonitrile and proprietary elastomeric polyesters and polyurethanes; (13) and (14) ethylene and propylene polymers and polyallomers; and (15) a film and fibre-forming polyester during the polycondensation.ALSO:0.005 to 0.5 wt. of a fluorescent compound as claimed in any of claims 1 to 8 of Specification Serial No. 1,072,914 is used as an optical brightener for solid polymeric material. Such compounds fall within the general formula wherein R/sv indicates that the rings may be substituted by one or more of halogen, alkyl, aryl, alkaryl, aralkyl, alkoxy, aryloxy, acyl, acyloxy, hydroxyl, amino, substituted amino, quaternised ammonium, sulpho, substituted sulphonyl, sulphamyl, substituted sulphamyl, cyano, thiocyano, thiol, carbamyl, substituted carbamyl, carbamyloxy or nitro and Y and Y/sv each represent H, alkyl, aryl or cyano. Specified polymeric materials are polyethylene, polypropylene, ethylene-propylene polyallomers; polyesters e.g. of ethylene or 1,4-cyclohexylenedimethylene glycol and terephthalic acid or naphthalene dicarboxylic acid; acrylonitrile polymers; polyurethanes; rayon; cellulose esters e.g. acetate, triacetate or acetate-butyrate; and polyamides. In examples the compounds are incorporated in (1) a titanium dioxide and polyethylene terephthalate concentrate which is incorporated in the melt extrusion of polyester fibres; (2) melt-extruded fibres of poly(1,4-cyclohexylenedimethylene terephthalate) containing titanium dioxide; (3) to (4) similar polyester and (5) polyamide fibres in woven fabric form by dyeing procedures.