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US 4,595,709 AGranted
Process for the production of isocyanate polyaddition products
AssigneeBayer Aktiengesellschaft
InventorArtur Reischl
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AssigneeBayer Aktiengesellschaft
InventorArtur Reischl
Estimating the term…
Polyaddition products containing urethane groups are produced by reacting an isocyanate group containing distillation residue with a compound having a molecular weight less than 600 containing at least two alcoholic hydroxyl groups. The distillation residue is obtained in the commercial production of tolylene diisocyanate. The distillation residue and hydroxyl compound are reacted in amounts such that the NCO/OH equivalent ratio is less than 1.5:1. The polyaddition reaction is carried out at a temperature in the range of 50.degree. to 220.degree. C. The reaction is carried out in a reaction screw extruder preferably having self-cleaning screw geometry. The polyaddition products are useful as molding compositions, reactive fillers and starting materials in the production of flame-resistant polyurethane plastics.
A process for the production of polyaddition products containing urethane groups in which an isocyanate-group-containing distillation residue obtained in the commercial production of tolylene diisocyanate is reacted continuously with a compound having an average molecular weight of less than 600 and containing at least two alcoholic hydroxyl groups in an NCO/OH equivalent ratio less than 1.5:1 at a temperature in the range of 50.degree. to 220.degree. C. in a reaction extruder.
A molding composition made by continuously reacting an isocyanate-group-containing distillation residue obtained in the commercial production of tolylene diisocyanate with a compound having a molecular weight less than 600 and containing at least two alcoholic hydroxyl groups in an NCO/OH equivalent ratio of less than 1.5:1 at temperatures in the range of 50.degree. to 220.degree. C. in an extruder reactor.
A reactive filler useful in the production of plastics by polycondensation and polymerization reactions which is produced by continuously reacting an isocyanate-group-containing distillation residue obtained in the commercial production of tolylene diisocyanate with a compound having a molecular weight less than 600 and containing at least two alcoholic hydroxyl groups in an NCO/OH equivalent ratio of less than 1.5:1 at temperatures in the range of 50.degree. to 220.degree. C. in a reaction extruder.
A process for the production of a flame-resistant polyurethane plastic by the polyaddition of
Dependencies are inferred from the claim text.