Process for the production of polyurethane foams
AssigneeBayer Aktiengesellschaft
InventorsManfred Dahm, Alberto Carlos Gonzalez-Dorner
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Abstract
The instant invention is directed to polyurethane foams and the process for their manufacture, wherein an organic polyisocyanate is reacted, in the presence of a blowing agent, with a dispersion of a polyurea and/or a polyhydrazodicarbonamide in a relatively high molecular weight organic compound containing at least one hydroxyl group.
Claims18
A process for the production of polyurethane foam comprising reacting in the presence of a blowing agent:
- a. an organic polyisocyanate, and
- b. a dispersion of a polyurea and/or a polyhydrazodicarbonamide in a relatively high molecular weight organic compound containing at least one hydroxyl group, wherein the concentration of the polyureas and/or polyhydrazodicarbonamide is from 1 to 40% by weight of the dispersion based on 100 parts by weight of said organic compound.
A process for the production of highly flexible polyurethane foams comprising reacting distilled tolylene diisocyanate with a polyether or polyethers having at least two hydroxyl groups in the presence of a blowing agent and in the presence of a reaction product of (a) hydrazine derivatives and/or hydrazine adducts of the general formula
- R--NH--NH--R' .sup.. (H.sub.2 O).sub.n,
- wherein R and R', which may be different or the same, each represent a hydrogen atom or an alkyl, cycloalkyl, aralkyl or acyl radical, and n = 0 or 1, and (b) a polyisocyanate, the reaction being carried out in the absence of foam stabilizers of the polyether-polysiloxane block copolymer type, wherein the compounds (a) and (b) are reacted in an NCO:OH equivalent ratio of 0.8:1 to 1.05:1.
Dependencies are inferred from the claim text.