Abstract Solid silicone defoaming agent which consists of a self-emulsifying defoaming agent compound (A) and wax (B). The self-emulsifying defoaming agent compound (A) is itself composed of a silicone oil compound a (c) polyoxyalkylene and/or polyoxyalkylene/polysiloxane copolymer and optionally a (d) liquid, water-soluble surfactant. It is this component which is the active component of the solid silicone defoaming agent of the present invention. This self-emulsifying defoaming agent compound has the ability to form an oil-in-water emulsion when stirred into water. Furthermore, the silicone oil compound constituent of the self-emulsifying defoaming agent compound (A) consists of (a) silicone oil composed of polydimethylsiloxane with a viscosity of at least 20 centistokes at 25 degrees Centigrade and (b) microparticulate silica. The defoaming agent compound must contain at least 5 weight% of this silicone oil compound. It is preferred that the proportions of silicone oil (a) and microparticulate silica (b) fall within the range of, for example, 80 - 99,5 : 0,5 - 20 (weight).
Solid silicone defoaming agent characteristically comprising (A) 5 to 60 weight parts self-emulsifying defoaming agent compound and (B) 95 to 40 weights part wax; wherein said self-emulsifying defoaming agent compound (A) consists of at least 5 weight% silicone oil compound comprising (a) silicone oil having a viscosity of at least 20 centistokes at 25 degrees Centigrade and (b) microparticulate silica, (c) at least 30 weight% polyoxyalkylene and/or polyoxyalkylene/polysiloxane copolymer, and (d) zero to 30 weight% optionally added liquid, water-soluble surfactant other than said (c); wherein said wax (B) consists of (i) wax which does not disperse or dissolve in water at room temperature and which has a melting point of at least 35 degrees Centigrade, and/or (ii) wax which dissolves or disperses in water at room temperature and which has a melting point of at least 30 degrees Centigrade; and wherein the wax (i) comprises no more than 60 weight% of the overall defoaming agent.
Claim 2
Dependent Claim
155 words
Solid silicone defoaming agent characteristically comprising (A) 5 to 60 weight parts self-emulsifying defoaming agent compound and (B) 95 to 40 weights part wax; wherein said self-emulsifying defoaming agent compound (A) consists of at least 5 weight% silicone oil compound comprising (a) silicone oil having a viscosity of at least 20 centistokes at 25 degrees Centigrade and (b) microparticulate silica, (c) at least 30 weight% polyoxyalkylene and/or polyoxyalkylene/polysiloxane copolymer, and (d) zero to 30 weight% optionally added liquid, water-soluble surfactant other than said (c); wherein said wax (B) consists of (i) wax which does not disperse or dissolve in water at room temperature and which has a melting point of at least 35 degrees Centigrade, and/or (ii) wax which dissolves or disperses in water at room temperature and which has a melting point of at least 30 degrees Centigrade; and wherein the wax (i) comprises no more than 60 weight% of the overall defoaming agent.
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