GB745896A - Improvements relating to cellulose acetate compositions - Google Patents

Abstract

The invention comprises compositions of cellulose acetate of at least 52 per cent acetic acid content with beta-monoacylmethylene sulpholanes or similar b -esters or ethers, (see Group IV (b)), as plasticizers. In examples, films are cast from acetone solutions of cellulose acetate especially triacetate with various proportions of sulpholauryl acetone, and sulpholauryl derivatives of other aliphatic ketones, and acetophenone; 3-sulpholauryl acetate, butyrate, and derivatives of aliphatic acids up to 5 C atoms; 3-sulpholauryl benzoate in conjunction with alkyl phthalate, phosphate and glycolate plasticizers; methoxyethyl-3-sulpholauryl ethers, and other sulpholauryl aliphatic ethers containing either groups of up to 5 C atoms, and diethers such as the ethoxy ethyl-, and phenyl ether in conjunction with other plasticizers. The plasticizers may also be used in making sheets by block process, moulding compositions, and lacquers, and in proportions of about 20 to 80 per cent. The Provisional Specification refers also to sulpholauryl products from other ketones, and other ethers and esters, and other derivatives, which may be used for plasticizing cellulose nitrate and cellulose ethers; and to the use of these compounds as plasticizers &c. for acetone-soluble polymers and co-polymers including polyvinyl acetate, acrylates, vinyl chloride, vinylidene chloride, acrylonitrile, vinyl acetate and isopropenyl acetate. This subject-matter does not occur in the Specification as accepted.ALSO:The invention comprises compositions of cellulose acetate of at least 52 per cent acetic acid content with b -mono-acyl-methylene sulpholanes, or similar b -esters or ethers, as plasticizers. The sulpholane derivatives may be made by the condensation of 3-sulpholene with ketones, esterifying 3-sulpholanol (obtained by hydrating sulpholene), with acids, especially paraffin monocarboxylic acids and by etherifying sulpholanol with alcohols or ethers of glycols. In examples, the preparation is described of sulpholanyl acetone, from sulpholene and acetone, sulpholanyl butyrate from 3-sulpholanol and n butyric anhydride, sulpholanyl benzoate, from sulpholanol and benzoyl chloride, methoxy ethyl-3-sulpholanyl ether from 3-sulpholene and monomethyl ether of ethylene glycol, and also a phenyl ether of 3-sulpholanol; a number of other esters and ethers and ketone derivatives are specified. The products are incorporated into cellulose acetate compositions for making foils, mouldings, &c. The Provisional Specification refers also to sulpholanyl products from nitromethane, diethyl malonate, with hydrolysis to sulpholanyl acetic acid, ethyl cyanoacetate, with hydrolysis to sulpholanyl acetic acid, and the esters of this with alcohols; the preparation of 3-sulpholanyl - 2 - ethyl - hexoate is described; other sulpholanyl esters including the laurate, and derivatives substituted at the 3 and 4 C-atoms including diesters and diethers of 3 : 4 dihydroxysulpholane, and a 3-hydroxy-4-chlorosulpholane are included.