Patent GB-788822-A (GB)
Title: Improvements in preparation of gas-expanded organic plastic materials
IPC: C08J9/10
Filed: 1955-09-26
Abstract: An N-nitrososulphonamide for use as a blowing agent in the manufacture of cellular rubber &c. (see Group V), is prepared by suspending a sulphonamide in glacial acetic acid and adding sodium nitrite thereto.  The preparation of p, p1-oxybis-(N-nitroso-N-methyl benzene sulphonamide) and N,N1-ethylene bis-(N-nitrosobenzenesulphonamide) are described in detail.  Other compounds mentioned are various N-alkyl-N-nitroso-amides of benzene-, naphthalene-and diphenylether-sulphonic acids, and the corresponding alkylene-bis-compounds.ALSO:A gas expanded material is prepared by heating a mixture of a blowing agent, consisting of an N-nitroso sulphonamide containing the group: <FORM:0788822/IV (a)/1> and an organic plastic material which is capable of setting to a normally solid state and has sufficient consistency and tensile strength at temperatures of from 80 DEG  to 200 DEG  C. to retain the expanded structure.  The blowing agent may consist in N-nitroso-N-methyl or N-nitroso-N-ethyl benzene sulphonamide, N-nitroso-N-methyl or N-nitroso-N-ethyl p toluene sulphonamide, 1, 3 benzene bis (N-nitroso N-methyl sulphonamide), 1,3-xylene bis (N-nitroso N-methyl sulphonamide), p,p1 oxybis (N-nitroso N-methyl benzene sulphonamide) p,p1 oxybis (N - nitroso - N - ethyl benzene sulphonamide), 1,3 naphthalene bis (N-nitroso-N-methyl sulphonamide) 1,2 ethylene bis (N-nitroso benzene sulphonamide), 1,2 propylene bis (n-nitroso benzene sulphonamide) 1,2 ethylene bis (N-nitroso - p - toluene sulphonamide).  The organic plastic material may comprise natural rubber, an alkyd resin, ureaformaldehyde resin, polyacrylonitrile, polystyrene, polyvinyl chloride, a copolymer of vinyl chloride and a monomer such as vinyl acetate, a cellulose ester or ether, butadiene-styrene, butadiene acrylonitrile, butadiene-isobutylene, isobutylene-isoprene, polychloroprene, polyisobutylene or an olefin polysulphide.  Specifications 502,287, [Group V], 632,722 and 670,131 are referred to.ALSO:A gas expanded material is prepared by heating a mixture of a blowing agent, consisting of an N-nitroso sulphonamide containing the group: <FORM:0788822/V/1> and an organic plastic material which is capable of setting to a normally solid state and has sufficient consistency and tensile strength at temperatures of from 80 DEG  to 200 DEG C. to retain the expanded structure.  The blowing agent may consist in N-nitroso-N-methyl or N-nitroso-N-ethyl benzene sulphonamide, N-nitroso-N-methyl or N-nitroso-N-ethyl p toluene sulphonamide, 1, 3 Benzene bis (N nitroso N methyl sulphonamide), 1, 3-Xylene bis (N nitroso N methyl sulphonamide) p, p1 oxybis (N nitroso N methyl benzene sulphonamide), p, p1 oxybis (N nitroso Nethyl benzene sulphonamide), 1, 3 naphthalene bis (N nitroso N methyl sulphonamide) 1, 2 ethylene bis (N-nitroso benzene sulphonamide), 1, 2 propylene bis (n-nitroso benzene sulphonamide) 1, 2 ethylene bis (N-nitroso-p-toluene sulphonamide).  The organic plastic material may comprise natural rubber, an alkyd resin, urea-formaldehyde resin, polyacrylonitrile, polystyrene, polyvinyl chloride, a copolymer of vinyl chloride and a monomer such as vinyl acetate, a cellulose ester or ether, butadiene-styrene, butadiene acrylonitrile, butadiene-isobutylene, isobutylene-isoprene, polychloroprene, polyisobutylene, or an olefin polysulphide. Specifications 502,287, 632,722 and 670,131 [Group IV(a)] are referred to.