Patent GB-1499138-A (GB)
Title: Anionic sulphonated polyesters process for their manufacture and their use as dispersants
IPC: C09K23/04
Filed: 1975-02-25
Abstract: 1499138 Anionic polyesters CIBA-GEIGY AG 25 Feb 1975 [26 Feb 1974] 7911/75 Heading C3R [Also in Division D1] A process for the manufacture of anionic polyesters comprises reacting together (a) at least one n-alkylene, cycloalkylene- or di- (alkylene) - arylenediol or polyalkylene glycol, (b) at least one α,#-ethylenically unsaturated, aliphatic dicarboxylic acid or a functional derivative thereof, e.g. anhydride or ester having an alkyl group of 1 to 4 carbon atoms, (c) at least one saturated aliphatic, cyclo-aliphatic or aromatic dicarboxylic acid or a dimeric unsaturated fatty acid which is different from component (b) or a functional derivative of these acids, e.g. ester, the dimeric unsaturated fatty acid being derived from ethylenically unsaturated, monocarboxylic fatty acids of 16 to 22 carbon atoms, e.g. linoleic which contain 2 to 5 ethylenically unsaturated bonds, (d) at least one water soluble derivative of sulphurous acid or salt of oxymethansulphonic preferably having the formula wherein M<SP>+</SP> represents an alkali metal cation or ammonium cation unsubstituted or substituted by alkyl radicals of 1 to 20 carbon atoms or hydroxyalkyl groups of 1 to 4 carbon atoms, Z represents hydrogen or Me<SP>+</SP> and (8-2p) represents the valency of the sulphur atom and p and q are 1 or 2. The molecular proportions of the components may be either 1 mole of component (a), 0À05 to 1.45 moles of component (b), 0À05 to 1À45 moles of component (c) and 0À05 to 1À45 SO 3 -Me<SP>+</SP> equivalents of component (d) and the sum of the moles of components (b) and (c) is 0À66 to 1À5, or 1 mole component (a), 0À04 to 0À49 mole of components (b) and (c) respectively and 0À40 to 0À49 SO 3 -Na<SP>+</SP> equivalents of component (d) the components (b) and (c) being used in equimolecular amounts. In Examples 1 to 10 ethylene glycol, triethylene glycol, polyethylene glycol M.Wt. 200 or diethylene glycol are reacted with a mixture of maleic anhydride and sebacic acid either by melting them together and heating to above 150 C. or refluxing in toluene until the water split off is removed, a toluenesulphonic acid catalyst and hydroquinone polymerization inhibitor being used. The polyester formed is treated with a solution of sodium metabisulphite in water, refluxed to complete the reaction and neutralized with aqueous sodium hydroxide to give a 50% sulphonated polyester solution from which the sulphonated polyester may be obtained by evaporation. In other examples 1,4-cyclohexane diol is reacted with maleic anhydride and hexahydrophthalic anhydride; 2,3-butane diol is reacted with maleic anhydride and glutaric and a mixture of either maleic and terephthalic dimethyl esters or maleic anhydride and adipic acid are reacted with ethylene glycol under similar conditions to those used in Examples 1 to 10, the polyester formed being similarly treated with sodium metabisulphite. The anionic sulphonated polyesters may be used to produce stable aqueous dispersions of materials, e.g. dyestuffs used in processes for dyeing organic textile materials.