Patent GB-626526-A (GB)
Title: Improvements in compositions of nitrogen-containing linear condensation polymers and the production of shaped articles therefrom
IPC: C08G73/08
Filed: 1945-10-12
Abstract: An oxynitrile is used as solvent in compositions containing poly-1,2,4-triazoles or poly-4-amino-1,2,4-triazoles.  The polymers are produced by methods described in Specifications 612,609 and 613,020.  a -Oxynitriles or cyanhydrins are particularly useful as solvents.  Examples are formaldehyde cyanhydrin, acetaldehyde cyanhydrin, acetone cyanhydrin and ethylene cyanhydrin.  Other solvents, e.g. those specified in Specifications 612,609 and 613,020 may also be included in the compositions, together with plasticizers, dyes, pigments, diluents and other polymers.  Examples of diluents are methanol, ethanol, chloroform, methylene dichloride and ethylene dichloride. The solutions may contain up to 25 per cent or more of polymer and may be used for lacquers, or for making films or filaments by wet or dry methods.  Suitable coagulants are acetone or other ketones, alcohols for certain polymers, dioxane, esters or mixtures of these with water.  Examples describe the formation of solutions of a polymer prepared from sebacic dihydrazide and having an intrinsic viscosity of about 0.5 in (1) acetaldehyde cyanhydrin for production of a film; (2) acetone cyanhydrin for film production or impregnation of cotton fabric; (3) ethylene cyanhydrin by warming for preparation of a film; (4) acetaldehyde cyanhydrin with subsequent addition of methanol; (5) acetaldehyde cyanhydrin with subsequent addition of chloroform and (6) acetaldehyde cyanhydrin with which is mixed or to which is subsequently added ethylene dichloride.  Specification 613,986 also is referred to.ALSO:An oxynitrile is used as solvent in compositions containing poly-1,2,4-triazoles or poly-4-amino-1,2,4-triazoles. a -Oxynitriles or cyanhydrins are particularly useful as solvents.  The compositions may be used for impregnating textile materials.  Examples are formaldehydecyanhydrin, acetaldehydecyanhydrin, acetonecyanhydrin and ethylene-cyanhydrin.  Other solvents, e.g. those specified in Specifications 612,609 and 613,020, [both in Group IV (a)], may also be included in the compositions, together with plasticizers, dyes, pigments, diluents and other polymers.  Examples of diluents are methanol, ethanol, chloroform, methylene dichloride and ethylene dichloride.  The solution may contain up to 25 per cent or more of polymer and may be used for lacquers.  Suitable coagulants are acetone or other ketones, alcohols for certain polymers, dioxane, esters, or mixtures of them with water. Examples describe the formation of solutions of a polymer prepared from sebacic dihydrazide and having an intrinsic viscosity of about 0.5 in (1) acetaldehyde-cyanhydrin for production of a film; (2) acetonecyanhydrin for film production or impregnation of cotton fabric; (3) ethylene-cyanhydrin by warming for preparation of a film; (4) acetaldehyde-cyanhydrin with subsequent addition of methanol; (5) acetaldehydecyanhydrin with subsequent addition of chloroform; and (6) acetaldehyde-cyanhydrin with which is mixed or to which is subsequently added ethylene dichloride. Specification 613,986, [Group IV (a)], also is referred to.