Patent GB-595310-A (GB)
Title: Manufacture of insecticide compositions and articles made therefrom
IPC: A01N25/04
Filed: 1944-10-16
Abstract: An insecticidal rubber composition is made by dispersing a compound of the general formula R1-(R2)CH-CX3, X being chlorine or bromine, R1 being an organic radical containing at least 3 carbon atoms and R2 being an organic radical containing at least 5 carbon atoms, in rubber latex with the aid of a dispersing agent.  Dichlorodiphenyl trichloroethane is the specified compound.  Hevea latex, "Revertex" (Registered Trade Mark) or synthetic rubber latices, e.g., neoprene, may be employed.  In manufacture a dispersion of the compound may be added to non-vulcanised stabilised latex to pre-vulcanised latex prior to vulcanisation or to vulcanised latex.  According to examples, (1) dichloro diphenyl trichloroethane, "Darvan," sodium salts of a polymerised alkyl aryl sulphuric acid, aqueous caustic soda and aqueous ammonia casein are ground together in a ball or colloid and the resulting dispersion is mixed with stabilised latex, a surface tension lowering agent such as an alkyl napthalene sulphonate being added if necessary; (2) zinc oxide, sulphur, agerite white (dibetanapthyl-p-phenylene-diamine), butyl zimate (zinc dibutyldithiocarbamate), "Darvan," caustic soda and dichlorodiphenyl-trichloroethane are milled together and added as a dispersion to normal latex; (3) normal or negative latex is diluted with a solution of a cationic soap such as cetyl pyridinium bromide, dichloro-diphenyl trichloroethane being then dispersed in the latex as described in example (1). Specifications 497,793; 547,871 and 595,309, [both in Group VI], are referred to.ALSO:An insecticidal composition is made by dispersing a compound of the general formula R1-(R2)CH-CX3,X being chlorine or bromine, R1 being an organic radical containing at least 3 carbon atoms and R2 being an organic radical containing at least 5 carbon atoms, in rubber latex with the aid of a dispersing agent.  Dichlorodiphenyl trichloroethane is the specified compound.  Hevea latex, "Revertex" (Registered Trade Mark) or synthetic rubber latices, e.g. neoprene, may be employed. In manufacture, a dispersion of the compound may be added to non-vulcanized stabilized latex, to pre-vulcanized latex prior to vulcanization or to vulcanized latex.  According to examples: (1) dichloro diphenyl trichloroethane, "Darvan" (sodium salts of a polymerized alkyl aryl sulphonic acid, aqueous caustic soda and aqueous ammonia casein are ground together in a ball or colloid and the resulting dispersion is mixed with stabilized latex, a surface tension lowering agent such as an alkyl naphthalene sulphonate being added if necessary; (2) zinc oxide, sulphur, agerite white (dibetanaphthyl-p-phenylene-diamine), butyl zimate (zinc dibutyldithiocarbamate), "Darvan," caustic soda and dichlorodiphenyl-trichloroethane are milled together and added as a dispersion to normal latex; (3) normal or negative latex is diluted with a solution of a kationic soap such as cetyl pyridinium bromide, dichloro-diphenyl trichloroethane being then dispersed in the latex as described in example (1).  The composition may be used for tree spraying, for the impregnation of bedding and textiles such as knitted woollen goods, or in obtaining films, sheets or shaped articles having insecticidal properties by spraying, flowing or dipping.  Latex air-framed articles may be so prepared. Specifications 497,793, [Group IV], 547,871 and 595,309 are referred to.