Patent GB-399868-A (GB)
Title: Manufacture of plastic materials for the production of insulated conductors and of products therefrom
IPC: C08K5/06
Filed: 1932-04-14
Abstract: Insulating-material consists of a mixture of a water-insoluble cellulose ether and certain methylene diaralkyl ethers or methylene diaryl ethers.  These comprise methylene dibenzyl ether and its lower alkyl or alkoxy derivatives and methylene diphenyl ether and its lower alkyl or alkoxy derivatives.  Other ingredients of high electrical resistance such as artificial resins of the glyptal or phenol-aldehyde type, natural gums, resins or oils, rubber, pigments, fillers such as powdered slate, zinc oxide, &c. may also be present. The resistance of the products to ozone compares favourably with that of rubber, surface leakage is low, and they have high electrical resistivity, chemical stability, water and oil impermeability.  They are adapted for insulating conductors such as cables.  The incorporation may be made with the aid of solvents such as a toluene-alcohol mixture, which may be removed during treatment, e.g. on rolls, or may remain to form a solution suitable for spreading. In this latter case, the solvent may include a constituent of medium boiling point such as toluene or butyl alcohol, to prevent deposition of atmospheric moisture during evaporation of the solvent.  In examples (1) benzyl cellulose is mixed with methylene dibenzyl ether on heated rolls; (2) ethyl cellulose is mixed with methylene ditolyl ether and zinc oxide on heated rolls; (3) benzyl cellulose, methylene diphenyl ether and china clay are made up into a dope with xylol, toluene, and methylated spirits.  Specification 377,688, [Group V], is referred to.ALSO:Insulating-material consists of a mixture of a water-insoluble cellulose ether and certain methylene diaralkyl ethers or methylene diaryl ethers.  These comprise methylene dibenzyl ether and its lower alkyl or alkoxy derivatives and methylene diphenyl ether and its lower alkyl or alkoxy derivatives.  Other ingredients of high electrical resistance such as artificial resins of the glyptal or phenol-aldehyde type, natural gums, resins or oils, rubber, pigments, fillers such as powdered slate, zinc oxide, &c., may also be present.  The resistance of the products to ozone compares favourably with that of rubber, surface leakage is low, and they have high electrical resistivity, chemical stability, water and oil impermeability.  They are adapted for insulating conductors such as cables.  The incorporation may be made with the aid of solvents such as a toluene-alcohol mixture, which may be removed during treatment, e.g. on rolls, or may remain to form a solution suitable for spreading.  In this latter case, the solvent may include a constituent of medium boiling point such as toluene or butyl alcohol, to prevent deposition of atmospheric moisture during evaporation of the solvent.  In examples (1) benzyl cellulose is mixed with methylene dibenzyl ether on heated rolls; (2) ethyl cellulose is mixed with methylene ditolyl ether and zinc oxide on heated rolls; (3) benzyl cellulose, methylene diphenyl ether and china clay are made up into a dope with xylol, toluene, and methylated spirits. Specification 377,688, [Group V], is referred to.ALSO:Insulating-material consists of a mixture of a water-insoluble cellulose ether and certain methylene diaralkyl ethers or methylene diaryl ethers.  These comprise methylene dibenzyl ether p  and its lower alkyl or alkoxy derivatives and methylene diphenyl ether and its lower alkyl or alkoxy derivatives.  Other ingredients of high electrical resistance such as artificial resins of the glyptal or phenol-aldehyde type, natural gums, resins or oils, rubber, pigments, fillers such as powdered slate, zinc oxide, &c., may also be present.  The resistance of the products to ozone compares favourably with that of rubber, surface leakage is low, and they have high electrical resistivity, chemical stability, water and oil impermeability.  They are adapted for insulating conductors such as cables.  The incorporation may be made with the aid of solvents such as a toluene-alcohol mixture, which may be removed during treatment, e.g. on rolls, or may remain to form a solution suitable for spreading.  In this latter case, the solvent may include a constituent of medium boiling point such as toluene or butyl alcohol, to prevent deposition of atmospheric moisture during evaporation of the solvent.  In examples (1) benzyl cellulose is mixed with methylene dibenzyl ether on heated rolls; (2) ethyl cellulose is mixed with methylene ditolyl ether and zinc oxide on heated rolls; (3) benzyl cellulose, methylene diphenyl ether and china clay are made up into a dope with xylol, toluene, and methylated spirits. Specification 377,688 is referred to.