Patent GB-410797-A (GB)
Title: Improvements in or relating to mixed esters
IPC: C07C69/80
Filed: 1932-11-23
Abstract: Esters are prepared by esterifying two mols of a polycarboxylic acid with one mol of an alkylene or polyalkylene glycol and then esterifying the product with a sufficient quantity of a monohydroxy compound so that the resulting ester contains substantially no uncombined hydroxyl or carboxyl groups.  Suitable polycarboxylic include aliphatic acids such as succinic acid and aromatic acids such as phthalic or p-chlor-o-phthalic acids. Suitable glycols include ethylene, diethylene and 1-2-propylene glycol.  Suitable monohydroxy alcohols may be aliphatic alcohols such as methanol, ethanol or iso-propanol, aromatic alcohols such as benzyl or naphthyl alcohol, modified alcohols such as monochlorethanol or p-aminobenzyl alcohol or a monoalkyl, or aryl ether of a alkylene or polyalkylene glycol. The esterification may take place in any known manner and known esterification catalysts such as sulphuric acid, benzene sulphuric acid, pyridine or diethylamine may be used in effecting the reaction. Products that may be prepared include di-beta-butoxy ethyl ethyleneglycol diphthalate, di-beta-ethoxy ethyl diethylene glycol diphthalate and dibutyl ethylene glycol diphthalate.  The products are suitable as solvents for plastic materials such as cellulose derivatives including cellulose acetate and nitrate, cellulose ethers and cellulose ether-esters such as acetylethylcellulose; vinyl resins; phenol-aldehyde resins; urea-aldehyde resins; resinous gums such as ester gum; condensation products of polyhydric alcohols and polybasic acids and natural resins such as manilla, dammar, elemi and kauri.  The plasticized products may be used in the manufacture of lacquers, films and solid plastics.  A lacquer may be prepared from cellulose nitrate, di-beta-butoxyl ethyl ethylene glycol diphthalate, ester gum and a solvent comprising toluene, butyl acetate and butanol.  The Specification as open to inspection under Sect. 91 also refers to the use of different polycarboxylic acids and monohydroxy alcohols in the manufacture of the ester and contains no limitation as to the proportions of the components to be used. The esters may be prepared by esterification of the polycarboxylic acid with the monohydroxy alcohol and then linking the ester acids so prepared with a glycol.  Butyl acid phthalate and beta-ethoxy ethyl acid phthalate separately prepared may be jointly esterified with ethylene glycol. Citric acid may replace part of the phthalic acid used in some of the compositions.  This subject-matter does not appear in the Specification as accepted.ALSO:Esters prepared by esterifying two mols of a polycarboxylic acid with one mol of an alkylene or polyalkylene glycol and then esterifying the product with a sufficient quantity of a monohydroxy compound so that the resulting ester contains substantially no uncombined hydroxyl or carboxyl groups are suitable for use as solvents for plastic materials such as cellulose derivatives including cellulose acetate and nitrate, cellulose ethers and cellulose ether-esters such as acetylethylcellulose; vinyl resins; phenolaldehyde resins; urea-aldehyde resins; resinous gums such as ester gum; condensation products of polyhydric alcohols and polybasic acids and natural resins such as manilla, dammar, elemi and kauri.  The plasticized products may be used in the manufacture of films and solid plastics.