Patent ID: 6093222
Filing Date: 2000-07-25
Classification: B01D,C08G,C10G,C10L,C10M

Abstract:
A diesel fuel defoamer composition comprising:i) a mixture of Silicones A) and B) orii) a Silicone C)wherein Silicone A is a polyhydric silicone of the formula: ##STR4## where the R groups are independently R.sup.1, R.sup.2, R.sup.3, R.sup.4 or R.sup.5 ; R.sup.1 is an aromatic or saturated aliphatic hydrocarbon group; R.sup.2 is a polyhydric organic group; R.sup.3 is a polyether group comprising about 50% or more ethylene oxide units and having a molecular weight of up to 1500; R.sup.4 is an organic phenolic group; R.sup.5 is a group as defined for R.sup.2 except that the hydroxyl groups thereof have been reacted to form diester, diether, acetal or ketal groups; w=2+y+2z; y=0-2; z=0-2; y+z=0-2; w+x+y+z=20-60; the ratio R.sup.1 /R.sup.2, corresponding to the number of R.sup.1 groups divided by the number of R.sup.2 groups, is 3-19; and the ratio (R.sup.3 +R.sup.4 +R.sup.5)/R.sup.2, corresponding to the total number of R.sup.3, R.sup.4 and R.sup.5 groups divided by the number of R.sup.2 groups, is 0-2,Silicone B is a polyether containing silicone of the formula: ##STR5## where the R* groups are independently R.sup.1 or R.sup.3 ; R.sup.1 and R.sup.3 are as previously defined; a=2+c+2d; c=0-2; d=0-2; c+d=0-2; a+b+c+d=15-50; and the ration R.sup.1 /R.sup.3, corresponding to the number of R.sup.1 groups divided by the number of R.sup.3 groups, is 3-19,Silicone C is a polyhydric/polyether/phenolic silicone of the formula: ##STR6## where the R groups, w, x, y, and z are as previously defined, provided that R.sup.2 is a saturated polyhydric group; the ratio R.sup.3 /R.sup.2, corresponding to the number of R.sup.3 groups divided by the number of R.sup.2 groups, is a number greater than 0; and the ratio R.sup.4 /R.sup.2, corresponding to the number of R.sup.4 groups divided by the number of R.sup.2 groups, is a number greater than 0.