Method for producing a multiple bond-containing prepolymer as elastomer precursor
AssigneeCovestro Deutschland AG
InventorsMuhammad Afzal SUBHANI, Burkhard KOEHLER, Walter LEITNER, Thomas Ernst MÜLLER, Christoph GÜRTLER
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Abstract
The present invention relates to a method for producing a prepolymer that contains carbon-carbon multiple bonds, a polyol component A) being reacted with component B) that contains isocyanate groups and the polyol component comprising a polyether carbonate polyol that contains carbon-carbon multiple bonds.
Claims20
A process for preparing a prepolymer containing carbon-carbon multiple bonds, comprising reacting a polyol component A which comprises a polyethercarbonate polyol containing carbon-carbon multiple bonds, is with an isocyanate-containing component B,
- wherein
- the average molar NCO functionality of the isocyanate-containing component B is from 2.15 to 2.90, and the content of carbon-carbon multiple bonds in the polyethercarbonate polyol is from 0.5% by weight to 17.0% by weight.
The process as claimed in claim 8, wherein the isocyanate-containing component B comprises at least one polyisocyanate B1 having an average molar NCO functionality of 2.0 to 2.2 and at least one polyisocyanate B2 having an average molar NCO functionality of 2.8 to 3.2.
The process as claimed in claim 9, wherein the polyisocyanates B1 and B2 comprise a mixture of a diisocyanate monomer and a diisocyanate trimer.
Dependencies are inferred from the claim text.