Patent GB-872513-A (GB)
Title: Modified synthetic condensation polymers and their production
IPC: C08F283/00
Filed: 1957-07-02
Abstract: Grafted polymers are made by grafting on to a synthetic condensation polymer one or more monomers containing reactive non-aromatic carbon-carbon unsaturation and either acid groups or acid salt groups other than carboxyl or carboxylate salt groups, or functional groups which may be and subsequently are converted to said acid groups or acid salt groups.  Specified condensation polymers are polyhexamethylene adipamide, polycaproamide, polyhexamethylene terephthalamide, polyureas, polyesters, polyurethanes, polysulphonamides and polyethers, which may be in the form of fibres, flakes, films or woven fabrics.  Specified monomers which may be added to the polymer before or after shaping are those capable of forming a metal, amine or ammonium salt and which contain a vinylene or acetylenic group, e.g. styrene and ethylene sulphonic acids or unsaturated aliphatic acid phosphates, phosphites, phosphonates, phosphinates, carbonates and sulphates, and may also contain aromatic groups.  The organic acid may be applied to the shaped polymeric substrate by melt coating or as a dispersion, emulsion, solution, pure liquid or vapour, specified solvents being water, alcohol, benzene, toluene or ethers.  The grafting may be effected by particulate or electromagnetic irradiation which may be carried out before the polymeric substrate is contacted with the unsaturated acid or it may be effected by the technique disclosed in Specification 872,514.  The acid salt groups may be formed by after-treatment of acid-modified polymeric substrates with solutions containing positive ions.  In example, a polyhexamethylene adipamide fabric is soaked in an aqueous solution of potassium styrene sulphonate and irradiated. Specifications 461,236, 838,412, 845,897, 845,898 and U.S.A. Specifications 2,071,250, 2,130,948 and 2,385,890 also are referred to.ALSO:Grafted polymers having increased elasticity, deformability and antistatic properties and increased resistance to hole melting and flash heat are made by grafting on to a synthetic condensation polymer one or more monomers containing reactive non-aromatic carbon-carbon unsaturation and either acid groups or acid salt groups other than carboxyl or carboxylate salt groups, or functional groups which may be and subsequently are converted to said acid groups or acid salt groups.  Specified condensation polymers are polyhexamethylene adipamide, polycaproamide, polyhexamethylene terephthamide, polyureas, polyurethanes, polyesters, polysulphonamides and polyethers which may be in the form of fibres or woven fabrics.  Specified monomers are those capable of forming a metal, amine or ammonium salt and which contain a vinylene or acetylenic group, e.g. styrene and ethylene sulphonic acids or unsaturated aliphatic acid phosphates, phosphites, phosphonates, phosphinates, carbonates and sulphates, and may also contain aromatic groups.  The organic acids may be added to the shaped polymeric substrate by melt coating or as a dispersion, emulsion, solution, pure liquid or vapour, specified solvents being water, alcohol, benzene, toluene or ethers.  The grafting may be effected by particulate or electromagnetic irradiation, which may be carried out before the polymeric substrate is contacted with the unsaturated acid, or it may be effected by the technique disclosed in Specification 872,514. The acid salt groups may be formed by after treatment of acid-modified polymeric substrates with solutions containing positive ions.  In the example, a polyhexamethylene adipamide fabric is soaked in an aqueous solution of potassium styrene sulphonate and irradiated.  Specifications 461,236, 838,412, 845,897, 845,898; also U.S.A.  Specifications 2,071,250, 2,130,948 and 2,385,890 are also referred to.ALSO:Grafted polymers are made by grafting on to a synthetic condensation polymer which may be in the form of a shaped structure, e.g. a fibre, flake or film, one or more monomers containing reactive non-aromatic carboncarbon unsaturation and either acid groups or acid salt groups other than carboxyl or carboxylate salt groups, or functional groups which may be and subsequently are converted to said acid groups or acid salt groups. Specified condensation polymers are polyhexamethylene adipamide, polycaproamide, polyhexamethylene terephthalamide, polyureas, polyesters, polyurethanes, polysulphonamides and polyethers. Specified monomers which may be added to the polymer before or after shaping are those capable of forming a metal, amine or ammonium salt and which contain a vinylene or acetylenic group, e.g. styrene and ethylene sulphonic acids or unsaturated aliphatic acid phosphates, phosphites, phosphonates, phosphinates, carbonates and sulphates and may also contain aromatic groups.  The organic acids may be added to the shaped polymeric substrate by melt coating or by padding, dipping or spraying of a dispersion, emulsion, solution, pure liquid or vapour, specified solvents being water, alcohol, benzene, toluene or ethers.  The grafting may be effected by particulate or electromagnetic irradiation which may be carried out before the polymeric substrate is contacted with the unsaturated acid or it may be effected by the technique disclosed in Specification 872,514.  The acid salt groups may be formed by a treatment of acid-modified polymeric substrates with solutions containing positive ions.  In the example, a polyhexamethylene adipamide fabric is soaked in an aqueous solution of potassium styrene sulphonate and irradiated. Specifications 461,236, 838,412, 845,897, 845,898, and U.S.A. Specifications 2,071,250, 2,130,948 and 2,385,890 are referred to.