GB399191A - Improvements in cellulose derivative products - Google Patents

Abstract

Liquid and solid compositions, filaments, threads, films, and the like of improved waterproof properties, comprise cellulose ethers, ether-esters, or esters, in which the organic ester groups are derived from lower fatty acids, and relatively small proportions of cellulose derivatives containing radicles of higher fatty acids as sole substituent groups. The proportion of cellulose derivative containing radicles of higher fatty acids as sole substituent groups is preferably between 5 and 15 per cent by weight of the total cellulose derivatives. In a modification, films or sheets having a basis of regenerated cellulose, cellulose ethers, etheresters, or esters, in which the organic ester groups are derived from lower fatty acids, are coated with compositions comprising cellulose derivatives containing radicles of higher fatty acids as sole substituent groups. Suitable higher fatty acid esters are cellulose oleate, laurate, stearate, and palmitate. In the production of films from mixtures of cellulose derivatives and cellulose higher fatty acid esters, a common solvent or mixture of solvents should be employed, for example, a mixture of acetone and benzene is used to dissolve a mixture of cellulose acetate and cellulose laurate, stearate, or palmitate. High boiling solvents, plasticizers, resins, fire retardants, fillers, colouring matters, and the like may also be added. The following examples are given: (1) A mixture of cellulose acetate (85-90 parts), cellulose stearate (10-15 parts), tricresyl phosphate, and diethyl phthalate, is dissolved in a mixture of acetone and benzene, and the solution cast on to a film wheel, band, or the like. (2) A mixture of cellulose acetate (90-95 parts), cellulose palmitate (5-10 parts), diacetone alcohol, and diethyl phthalate, is dissolved in acetone-benzene mixture and cast on a suitable surface. (3) 90 parts of cellulose acetate-propionate dissolved in acetone are mixed with 10 parts of cellulose stearate-laurate dissolved in benzene, incorporated with triphenyl phosphate and diethyl phthalate, and the solution employed in the production of films. (4) A cellulose acetate foil is passed through a 5-10 per cent solution of cellulose stearate in acetone-benzene mixture, which solution may also contain dibutyl phthalate. The Provisional Specification refers generally to processes for the production of filaments or films (1) from a mixture of a cellulose ester of a lower fatty acid and a cellulose ester of a higher fatty acid, (2) from a mixed cellulose ester containing both lower and higher fatty acid radicals, and (3) by coating a film of a cellulose ester of a lower fatty acid with a cellulose ester of a higher fatty acid. Specification 319,073, [Class 2 (ii), Cellulose &c.], is referred to.ALSO:Liquid and solid compositions of improved waterproof properties, comprise cellulose ethers, ether-esters, or esters, in which the organic ester groups are derived from lower fatty acids, and relatively small proportions of cellulose derivatives containing radicles of higher fatty acids as sole substituent groups. The proportion of cellulose derivative containing radicles of higher fatty acids as sole substituent groups is preferably between 5 and 15 per cent by weight of the total cellulose derivatives. Suitable higher fatty acid esters are cellulose oleate, laurate, stearate, and palmitate. In the production of films from mixtures of cellulose derivatives and cellulose higher fatty acid esters, a common solvent or mixture of solvents should be employed, for example, a mixture of acetone and benzene is used to dissolve a mixture of cellulose acetate and cellulose laurate, stearate, or palmitate. High-boiling solvents, plasticizers, resins, fire retardants, fillers, colouring matters, and the like may also be added. The following examples are given:-(1) A mixture of cellulose acetate (85-90 parts), cellulose stearate (10-15 parts), tricresyl phosphate, and diethyl phthalate, is dissolved in a mixture of acetone and benzene, and the solution cast on to a film wheel, band, or the like. (2) A mixture of cellulose acetate (90-95 parts), cellulose palmitate (5-10 parts), diacetone alcohol, and diethyl phthalate, is dissolved in acetone-benzene mixture and cast on a suitable surface (3) 90 parts of cellulose acetate-propionate dissolved in acetone are mixed with 10 parts of cellulose stearate-laurate dissolved in benzene, incorporated with triphenyl phosphate and diethyl phthalate, and the solution employed in the production of films. Specification 319,073, [Class 70, Indiarubber &c.], is referred to.