Patent ID: 6258770
Filing Date: 2001-07-10
Classification: C11D,C23G

Abstract:
A method of reducing the flammability of n-propyl bromide when used in an aerosol application, which method comprises:A) blending with n-propyl bromide of a purity of at least 99 wt %, an additive system consisting of (a) in the range of about 0.1 to about 1 wt % of 1,3-dioxolane and (b) in the range of about 0.02 to about 0.5 wt % of one or more epoxyalkanes having in the range of 3 to about 7 carbon atoms in the molecule, wherein said n-propyl bromide, the 1,3-dioxolane and the epoxyalkane are present in proportions such that the resultant composition is more flame resistant when in the form of a spray dispersed in air, and wherein the flammability is measured under the conditions of ASTM test procedure D 3065 in which 1,1,1,2-tetrafluoroethane is employed as the propellant for said composition in the test procedure, andB) housing said composition in one or more aerosol spray dispensers; such that when said composition is dispensed from one of said dispensers as a highly dispersed spray in air, the flammability of said spray is reduced.