Antimicrobially effective organic foams and methods for their preparation
AssigneeDow Corning Corporation
InventorsDavid R. Battice, Michael G. Hales
Life of this patent
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Abstract
What is disclosed is a method for preparing antimicrobially effective foams using certain silanes as co-catalysts, co-surfactants and antimicrobial agents to give soft, resilient, fine-celled foams that are capable of reducing the number of, or eliminating, microorganisms in all types of media. Such foams themselves are not susceptible to attack by the microorganisms. An example is the use of (CH.sub.3 O).sub.3 Si(CH.sub.2).sub.3 N.sup..sym. (CH.sub.3).sub.2 C.sub.18 H.sub.37 Cl.sup.- in a flexible polyurethane foam formulation to give a fine-celled, soft, resilient foam which is antimicrobially effective over a long period of time.
Claims108
A process for preparing an antimicrobially active non-filled stable foam which comprises
- (I) contacting and intimately mixing, prior to foaming, a foamable organic system and an organosilane having the general formula selected from the group consisting of ##STR9## 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'", R"" and R.sup.v are each independently selected from a 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;
- X is chloride, bromide, fluoride, iodide, acetate or tosylate;, and
- (II) foaming the mixture from (I), and
- (III) allowing the foamable organic system to stabilize, whereby an antimicrobially active stable foam is obtained.
A process for preparing an antimicrobially active non-siliceous filled stable foam which comprises
- (I) contacting and intimately mixing, prior to foaming, a foamable organic system and an organosilane having the general formula selected from the group consisting of ##STR12## 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'", R"" and R.sup.v are each independently selected from a 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;
- X is chloride, bromide, fluoride, iodide, acetate or tosylate;, and
- (II) foaming the mixture from (I), and
- (III) allowing the foamable organic system to stabilize, whereby an antimicrobially active stable foam is obtained.
Dependencies are inferred from the claim text.