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US 6,955,778 B2Granted
Method for producing syntactic polyurethane
AssigneeBASF SE
InventorPeter Huntemann
Life of this patent
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Abstract
Syntactic polyurethanes are prepared by mixing hollow microspheres with polyurethanes by a process in which, in a first step, the polyurethane system components are reacted and, in a second step, the feeding of the hollow microspheres is effected in a mixing apparatus, the mixing apparatus being free of dead space and comprising i) a mixing pot, ii) a feed for polyurethane, iii) a feed for hollow microspheres, iv) a stirring element and v) an outlet orifice.
Claims6
A process for the preparation of a syntactic polyurethane by mixing hollow microspheres with a polyurethane preparable by reacting
- a) a polyisocyanate with
- b) a compound which has at least two hydrogen atoms reactive toward isocyanate, in the presence or absence of
- c) a catalyst,
- d) a blowing agent and
- e) an additive,
- which process comprises
- in a first step, reacting the components a) and b) and, if required, c) to d) to obtain a polyurethane mixture, and in a second step, mixing the polyurethane mixture with the hollow microspheres in a mixing apparatus which is free of dead space and which comprises
- i) a mixing pot,
- ii) a feed for polyurethane,
- iii)a feed for hollow microspheres,
- iv) a stirring element and
- v) a regulatable outlet orifice,
- to obtain the syntactic polyurethane, and wherein the syntactic polyurethane has a viscosity of from 1 000 to 30 000 mPa·s at the outlet orifice.
10 more elements
Dependencies are inferred from the claim text.