Patent GB-906867-A (GB)
Title: Process for dispersing solids in polymers
IPC: C08F2/44
Filed: 1958-11-27
Abstract: Synthetic polymer compositions comprising solid particulate filling substances dispersed in an organic polymer are prepared by mixing under turbulent conditions and in an inert non-solvent liquid carrier (1) at least one liquid organic material which forms a polymeric binder upon curing and (2) at least one solid particulate filling substance having a particle size of at least one micron, the organic material coating the filler and a dispersion of the coated particles being formed from which the carrier is removed prior to curing the liquid organic material. Most of the polymer compositions specified are rocket propellants and the organic liquids are partially polymerized materials or polymer forming mixtures.  Burning and curing catalysts may also be incorporated.  In the examples, the curable compositions are prepared from (1) dithioethoxy methylene polymer and ammonium perchlorate with small amounts of paraquinon-dioxime, ferric oxide and sulphur (2) manganese dioxide and an epoxy resin obtained by reacting epichlorohydrin with 2,2-bis(4-hydroxycyclohexyl)propane followed by further condensing with dimethylaminomethyl phenol (3) a diisocyanate of a polyether of propylene glycol, bis(2-chloro-4-aminophenyl) methane, dioctyl azelate (plasticizer), ammonium nitrate and copper oxide (4) as in (3) but the binder material being a mixture of (a) the reaction product of 1,3-dimethyl urea with linoleic acid dimer and (b) the reaction product of 1,2 epoxy-3-chloropropane with triethylene glycol (5) ammonium perchlorate, benzoyl peroxide and a gum formed by hydrolysing a mixture of 90 mol. per cent dimethyldichlorosilane and 10 mol. per cent of diphenyldichlorosilane followed by careful heating in the presence of ferric chloride (6) dithiobutoxy methylene polymer and ammonium perchlorate with small amounts of paraquinone-dioxime, sulphur, diphenylguanidine and magnesium oxide (7) as in (1) but also containing aluminium powder (8) dithioethoxy methylene polymer and potassium perchlorate with small amounts of paraquinone dioxime and diphenylguandine (9) a condensate of epichlorohydrin and 2,2-bis (4-hydroxycyclohexyl)propane, dimethylamino methyl phenol, ammonium nitrate, ammonium perchlorate, aluminium powder and manganese oxide and (10) a diisocyanate of a polyether of propylene glycol, bis(2-chloro-4-aminophenyl) methane, dioctyl azelate, ammonium perchlorate and ferric chloride.  In these examples the carrier is n-heptane and the perchlorates are used in two different particle sizes.  Other specified components of the compositions are binders-a glycidyl polyether of 2,2-bis(4-hydroxyphenyl) propane and the condensate of propylene glycol and toluene diisocyanate: fillers-titanium dioxide, lead oxide, ferric oxide, carbon black, powdered metals and alloys, metal fluorides, asbestos fibres and numerous perchlorates and nitrates: burning catalysts-copper, vanadium, chromium, silver, molybdenum, zirconium, antimony, manganese, iron, cobalt and nickel, metal and metal oxide powders as well as aluminium oxide powder: curing catalysts-aluminium chloride, tris-trimethylsilyl borate and benzoyl peroxide: carriers-numerous hydrocarbons, halogen derivatives of hydrocarbons, alcohols, amines, ethers, ketones, aldehydes and esters specified.