Abstract: Defoamer compositions containing a plurality of defined organopolysiloxanes exhibit very short initial foam collapse and yet exhibit long lasting defoaming activity when added to aqueous media prone to foaming.

Abstract: Defoamer compositions containing a plurality of defined organopolysiloxanes exhibit very short initial foam collapse and yet exhibit long lasting defoaming activity when added to aqueous media prone to foaming.

Abstract: A mixture of unique organopolysiloxane, filler, and additional components are effective defoamers and may be used neat, or in the form of a powder or emulsion.

Abstract: Effective and long lasting defoamer compositions are prepared by admixing an organopolysiloxanes, a hydrophilic silica, a hydrophobic silica, optionally an organopolysiloxanes resin, and optionally a water insoluble inorganic compound, at a temperature of 50° C. to 250° C. until the viscosity of the composition has decreased to at least half its original viscosity prior to heating.

Abstract: A mixture of unique organopolysiloxane, filler, and additional components are effective defoamers and may be used neat, or in the form of a powder or emulsion.

Abstract: Effective and long lasting defoamer compositions are prepared by admixing an organopolysiloxanes, a hydrophilic silica, a hydrophobic silica, optionally an organopolysiloxanes resin, and optionally a water insoluble inorganic compound, at a temperature of 50° C. to 250° C. until the viscosity of the composition has decreased to at least half its original viscosity prior to heating.

Abstract: Efficient deaeration of aqueous suspensions such as those obtained during textile treatment or pulp and paper production is achieved by use of a combination of a polyoxypropylene polyether polymer or copolymer and branched polyether-polysiloxane copolymers.

Abstract: Superior defoamer compositions contain a low viscosity linear organopolysiloxane, a higher viscosity, optionally branched organopolysiloxane, a polyethersiloxane with a low cloud point, and both colloidal silica and fumed silica.

Abstract: Superior defoamer compositions contain a low viscosity linear organopolysiloxane, a higher viscosity, optionally branched organopolysiloxane, a polyethersiloxane with a low cloud point, and both colloidal silica and fumed silica.

Abstract: Efficient deaeration of aqueous suspensions such as those obtained during textile treatment or pulp and paper production is achieved by use of a combination of a polyoxypropylene polyether polymer or copolymer and branched polyether-polysiloxane copolymers.

Abstract: The invention describes a novel method for deaerating liquids by adding 0.0001 to 5.0% by weight, preferably 0.0002-1.0% by weight, especially preferred 0.001-0.2% by weight of branched polyether-polysiloxane copolymers to said liquids. Only those branched polyether-polysiloxane copolymers are used in which the polyether radicals are SiC-bonded via hydrocarbon radicals to linear siloxane chains and said siloxane chains are connected to each other via SiC-bonded organic radicals, preferably divalent to decavalent, preferably divalent to tetravalent, hydrocarbon radicals, which may contain one or more heteroatoms selected from the group consisting of oxygen and nitrogen atoms.

Abstract: (A) Siloxane-based antifoams and (B) silicone polyethers prepared by reacting organopolysiloxanes (1) containing 0.05% to 1.6% by weight of Si-bonded hydrogen atoms with unsaturated polyethers (3) of the formulae: CH2?CR1—(CH2)aO(C2H4O)bR1??(Ia) CH2?CR1—(CH2)aO(C2H4O)b(C3H6O)cR1??(Ib) CH2?CR1—(CH2)aO(C3H6O)cR1??(Ic), where R1 is a hydrogen or a C1-6 hydrocarbon radical, a is 0 to 16, b is 1 to 50, and c is 1 to 50, wherein the sum b+c is ?10 and at least two different polyethers (Ia), (Ib) and (Ic) are used, and optionally further reacting the reaction product with organopolysiloxanes (2) containing from 0.01% to 0.5% by weight of Si-bonded hydrogen atoms, wherein the first and second step reactions take place with a hydrosilylation catalyst, and the weight ratio of Si-bonded hydrogen in organopolysiloxane (1) to Si-bonded hydrogen in organopolysiloxane (2) is at least 1.5.

Abstract: (A) Siloxane-based antifoams and (B) silicone polyethers prepared by reacting organopolysiloxanes (1) containing 0.05% to 1.6% by weight of Si-bonded hydrogen atoms with unsaturated polyethers (3) of the formulae: CH2?CR1—(CH2)aO(C2H4O)bR1??(Ia) CH2?CR1—(CH2)aO(C2H4O)b(C3H6O)cR1??(Ib) CH2?CR1—(CH2)aO(C3H6O)cR1??(Ic), where R1 is a hydrogen or a C1-6 hydrocarbon radical, a is 0 to 16, b is 1 to 50, and c is 1 to 50, wherein the sum b+c is ?10 and at least two different polyethers (Ia), (Ib) and (Ic) are used, and optionally further reacting the reaction product with organopolysiloxanes (2) containing from 0.01% to 0.5% by weight of Si-bonded hydrogen atoms, wherein the first and second step reactions take place with a hydrosilylation catalyst, and the weight ratio of Si-bonded hydrogen in organopolysiloxane (1) to Si-bonded hydrogen in organopolysiloxane (2) is at least 1.5.

Abstract: Defoamer compositions which exhibit both high defoaming activity as well as good storage stability are prepared by mixing at least an organopolysiloxane having a defined but limited fraction of silicon-bonded hydroxyl and/or alkoxy groups and hydrophilic silica, followed by heating until the viscosity of the mixture has fallen to less than 50% of its value prior to heating.

Abstract: Defoamer compositions of high effectiveness containing at least one siloxane-based antifoam and polysiloxane copolymers obtained by coupling a polysiloxane bearing active-hydrogen-containing hydrophilic polymer moieties by means of a di- or polyisocyanate.

Abstract: Defoaming compositions employing organopolysiloxanes bearing aryl radicals exhibit surprising efficiency relative to their alkyl counterparts.

Abstract: Cellulosic substrates are treated with compound(s) containing at least two primary amino groups and compounds containing at least one ?-ketocarbonyl group. The substrates exhibit good strength and hand properties.

Abstract: Defoamer compositions of high effectiveness containing at least one siloxane-based antifoam and coupling a polysiloxane bearing active-hydrogen-containing hydrophilic polymer moieties by means of a di- or polyisocyanate.

Abstract: Fibrous substrates with exacted properties are copolymer prepared by reacting an Si-H bearing polysiloxane with a compound containing both a hydrosilylatable group and an isocyanate reactive group, followed by reaction with di- or polyisocyanate used at or below the stoichiometric amount of NCO groups.

Abstract: Defoaming compositions employing organopolysiloxanes bearing aryl radicals exhibit surprising efficiency relative to their alkyl counterparts.