Patent GB-980005-A (GB)
Title: Blends of chlorinated melamine and diluents as butyl rubber modifiers
IPC: C08K5/3492
Filed: 1963-02-14
Abstract: A storage-stable promoter for the dispersion of carbon black in butyl rubber comprises a dry, finely-divided, uniform, homogenous powder blend consisting essentially of from about ten to about 50 parts by weight of a chlorinated melamine in which chlorine has replaced at least three hydrogens of the - NH2 groups and a sufficient amount of particulate siliceous solid material to form about 100 parts of powder blend, said siliceous material being selected from water-insoluble silicas, silicates and hydrous silicates, including clays and diatomaceous earths.  The composition may be prepared by dry blending, but is preferably prepared by adding at least one-third of the siliceous solids to an aqueous suspension of the chlorinated melamine, agitating to obtain uniform dispersion, collecting the suspended solids, drying and simultaneously adding the remainder of the siliceous solids and grinding the dried solids to the desired size.  The aqueous suspension of chlorinated melamine may be the reaction mixture obtained by direct chlorination of melamine in aqueous suspension. Hexachloro-melamine is preferred.ALSO:A storage-stable promoter for the dispersion of carbon black in butyl rubber comprises a dry, finely-divided, uniform, homogenous powder blend consisting essentially of from about ten to about 50 parts by weight of a chlorinated melamine in which chlorine has replaced at least three hydrogens of the -NH2 groups and a sufficient amount of particulate siliceous solid material to form about 100 parts of powder blend, said siliceous material being selected from water-insoluble silicas, silicates and hydrous silicates, including clays and diatomaceous earths.  The composition may be prepared by dry blending, but is preferably prepared by adding at least one third of the siliceous solids to an aqueous suspension of the chlorinated melamine, agitating to obtain uniform dispersion, collecting the suspended solids, drying and simultaneously adding the remainder of the siliceous solids and grinding the dried solids to the desired size.  The aqueous suspension of chlorinated melamine may be the reaction mixture obtained by direct chlorination of melamine in aqueous suspension.  Hexachloromelamine is preferred.ALSO:The dispersion of carbon black in butyl rubber is improved by incorporating into the mix, prior to heat treatment and mastication, a dry, finely-divided, uniform, homogeneous powder blend consisting essentially of from about ten to about 50 parts by weight of a chlorinated melamine in which chlorine has replaced at least three hydrogens of the - NH2 groups and a sufficient amount of particulate siliceous solid material to form about 100 parts of powder blend, said siliceous material being selected from water-insoluble silicas, silicates and hydrous silicates, including clays and diatomaceous earths. Hexachloro-melamine is preferred.  Enough of the composition may be added to provide 0.05 to 2.5 parts by weight of chlorinated melamine per 100 parts of rubber. The mixture may be vulcanized after the heat treatment and mastication.