Claims
- 1. In an antifoam for destabilizing foams produced by surfactants including a particulate material having a high surface area, the improvement comprising an antimicrobial agent chemically bonded to the surface of the particulate material, the antimicrobial agent being an organosilane having the general formula selected from the group consisting of ##STR10## wherein, in each formula, R is an alkyl radical of 1 to 4 carbon atoms or hydrogen;
- a has a value of 0, 1 or 2;
- R' is a methyl or ethyl radical;
- R" is an alkylene group of 1 to 4 carbon atoms;
- R'" and R"" are each independently selected from the group consisting of alkyl radicals of 1 to 18 carbon atoms, --CH.sub.2 C.sub.6 H.sub.5, --CH.sub.2 CH.sub.2 OH, --CH.sub.2 OH, and --(CH.sub.2).sub.x NHC(O)R.sup.vi, wherein x has a value of from 2 to 10 and R.sup.vi is a perfluoroalkyl radical having from 1 to 12 carbon atoms;
- R.sup.v is selected from the group consisting of alkyl radicals of 16 or 18 carbon atoms, --CH.sub.2 C.sub.6 H.sub.5, --CH.sub.2 CH.sub.2 OH, --CH.sub.2 OH, and --(CH.sub.2).sub.x NHC(O)R.sup.vi, wherein x has a value of from 2 to 10 and R.sup.vi is a perfluoroalkyl radical having from 1 to 12 carbon atoms; and
- X is chloride, bromide, fluoride, iodide, acetate or tosylate.
- 2. The antifoam of claim 1 wherein the particulate material is silica.
RELATED PATENT APPLICATIONS
This application is a continuation-in-part of our prior copending application U.S. Ser. No. 07/221,581, filed July 20, 1988, now abandoned and entitled "Antimicrobial Antifoam Compositions and Methods".
US Referenced Citations (48)
Foreign Referenced Citations (5)
Number |
Date |
Country |
1217004 |
Jan 1987 |
CAX |
156809 |
Mar 1985 |
JPX |
8601457 |
Jan 1987 |
WOX |
1386876 |
Mar 1975 |
GBX |
1433303 |
Apr 1976 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Applied Microbiology, vol. 24, No. 6, Dec. 1972, A. J. Isquith et al., "Surface Bonded Antimicrobial Activity of an Organosilicon Quaternary Ammonium Chloride". |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
221581 |
Jul 1988 |
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