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US 4,251,638 AGranted
Process for the production of polyurethane plastics
AssigneeBayer Aktiengesellschaft
InventorArtur Reischl
Life of this patent
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Abstract
This invention relates to a process for the production of optionally cellular polyurethane plastics using a reactive filler obtained by finely grinding a distillation residue of the type accumulating in the commercial production of tolylene diisocyanate. It is possible in this way to recycle the previously unuseable slag-like residues and at the same time to improve the mechanical properties of the polyurethane plastics filled with them.
Claims9
A process for the production of optionally cellular polyurethane plastics by the polyaddition of
- (A) polyisocyanates and, optionally,
- (B) low molecular weight and/or relatively high molecular weight compounds containing isocyanate-reactive hydrogen atoms, in the presence of
- (C) organic fillers and, optionally,
- (D) blowing agents, catalysts and other known additives, wherein the improvement comprises component (C) being a crosslinked distillation residue which is insoluble in inert organic solvents and which cannot be melted without decomposing, and which contains less than 15% free isocyanate groups, of the type accumulating as slag in the distillation of monomeric tolylene diisocyanates from the crude phosgenation products of tolylene diamines and which have been size-reduced to a mean particle size of less than 800 m.mu..
1 more element
Dependencies are inferred from the claim text.