Patent GB-406011-A (GB)
Title: Improvements in the manufacture of plastic compositions, filaments, films and the like from cellulose esters
IPC: C08J3/09
Filed: 1932-07-18
Abstract: In the production of coating compositions, a mixed ester of cellulose containing at least two of the radicles acetate, propionate, and butyrate, is dissolved in a solvent consisting substantially of an alkylene chloride.  When the solvent power of the alkylene chloride is insufficient, particularly in the case of alkylene chlorides higher than ethylene chloride, a small proportion of an agent conferring solubility may be added, for example, methyl or ethyl alcohol.  Plasticizers such as triphenyl phosphate and tricresyl phosphate, and also gums, fats, waxes, resins, or the like, may be added.  Cellulose derivatives specified are the acetatepropionate, acetate-butyrate, acetate-propionate-butyrate, acetate-butyrate-nitrate, and acetate-propionate-nitrate. p   The Specification as open to inspection under Sect. 91 refers generally to the use of a solvent consisting of or containing an alkylene chloride for dissolving a simple or mixed ester of cellulose containing a fatty acid radicle higher than acetyl, and also cellulose acetate-nitrate.  This subject-matter does not appear in the Specification as accepted.ALSO:In the production of filaments, films, compositions, and the like, a mixed ester of cellulose containing at least two of the radicles acetate, propionate, and butyrate, is dissolved in a solvent consisting substantially of an alkylene chloride.  When the solvent power of the alkylene chloride is insufficient, particularly in the case of alkylene chlorides higher than ethylene chloride, a small proportion of an agent conferring solubility may be added, for example, methyl or ethyl alcohol. Plasticizers such as triphenyl phosphate and tricresyl phosphate, and also gums, fats, waxes, resins, or the like, may be added. Films produced according to the invention are characterised by their high flexibility and stability, freedom from haze, and the property of flatness.  Cellulose derivatives specified are the acetatepropionate, acetate - butyrate, acetate - propionate-butyrate, acetate-butyrate-nitrate, and acetate - propionate - nitrate.  In an example, cellulose acetate-propionate is dissolved in ethylene chloride and triphenyl phosphate, and formed into a film.  In a further example, a thin sheet is produced from a solution comprising cellulose acetate-butyrate, methylene chloride and tricresyl phosphate. Specification 402,730 is referred to.  The Specification as open to inspection under Sect. 91 refers generally to the use of a solvent consisting of or containing an alkylene chloride for colloidising a simple or mixed ester of cellulose containing a fatty acid radicle higher than acetyl, and also cellulose acetate-nitrate. This subject-matter does not appear in the Specification as accepted.ALSO:In the production of plastic compositions, and the like, a mixed ester of cellulose containing at least two of the radicles acetate, propionate, and butyrate, is dissolved in a solvent consisting substantially of an alkylene chloride.  When the solvent power of the alkylene chloride is insufficient, particularly in the case of alkylene chlorides higher than ethylene chloride, a small proportion of an agent conferring solubility may be added, for example, methyl or ethyl alcohol. Plasticizers such as triphenyl phosphate and tricresyl phosphate, and also gums, fats, waxes, resins, or the like, may be added. Films produced according to the invention are characterised by their high flexibility and stability, freedom from haze, and the property of flatness.  Cellulose derivatives specified are the acetate - propionate, acetate - butyrate, acetate-propionate-butyrate, acetate-butyrate-nitrate, and acetate-propionate-nitrate.  The Specification as open to inspection under Sect. 91 refers generally to the use of a solvent consisting of or containing an alkylene chloride for colloidising a simple or mixed ester of cellulose containing a fatty acid radicle higher than acetyl, and also cellulose acetate-nitrate.  This subject-matter does not appear in the Specification as accepted.