Hydrophobic free-flowing pellets, a process for their production and their use
First Claim
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1. A process for the production of hydrophobic, free-flowing pellets having an average particle size of 5 to 150 μ
- m comprising the steps of;
(i) providing a first hydrophilic inorganic powder and a second hydrophilic inorganic powder which is separate and distinct from said first inorganic powder;
(ii) providing an aqueous emulsion comprising one or more hydrophobic polyorganosiloxanes;
(iii) adding together in a granulator said first and said second inorganic powders and said aqueous emulsion to provide a mixture, said mixture comprising from about 0.05 to 15% by weight said hydrophobic polyorganosiloxane and processing said mixture in said granulator; and
(iv) heating said mixture subsequent to said step (iii) for up to 24 hours at a temperature of from 120°
to 600°
C. to provide said free-flowing pellets.
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Abstract
This invention relates to hydrophobic free-flowing pellets having an average particle size of 5 to 150 μm, which consist of one or preferably more hydrophilic inorganic powders having a particle size of >0 to 30 μm and contain one or more hydrophobic polyorganosiloxanes in a quantity of 0.03 to 15% by weight, to a process for their production and to their use.
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7 Claims
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1. A process for the production of hydrophobic, free-flowing pellets having an average particle size of 5 to 150 μ
- m comprising the steps of;
(i) providing a first hydrophilic inorganic powder and a second hydrophilic inorganic powder which is separate and distinct from said first inorganic powder; (ii) providing an aqueous emulsion comprising one or more hydrophobic polyorganosiloxanes; (iii) adding together in a granulator said first and said second inorganic powders and said aqueous emulsion to provide a mixture, said mixture comprising from about 0.05 to 15% by weight said hydrophobic polyorganosiloxane and processing said mixture in said granulator; and (iv) heating said mixture subsequent to said step (iii) for up to 24 hours at a temperature of from 120°
to 600°
C. to provide said free-flowing pellets. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- m comprising the steps of;
Specification