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PROCESS FOR THE PREPARATION OF DEACTIVATED SUSPENSIONS OF SMALL POLYISOCYANATE PARTICLES IN HIGHER MOLECULAR COMPOUNDS, DEACTIVATED SUSPENSIONS AND THEIR USE IN POLYURETHANE PREPARATION
PROCESS FOR THE PREPARATION OF DEACTIVATED SUSPENSIONS OF SMALL POLYISOCYANATE PARTICLES IN HIGHER MOLECULAR COMPOUNDS, DEACTIVATED SUSPENSIONS AND THEIR USE IN POLYURETHANE PREPARATION
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机译:高分子量化合物中小多异氰酸酯颗粒的失活悬浮液的制备,失活悬浮液及其在聚氨酯制备中的用途
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摘要
The present invention is directed to a process for the production of suspensions of finely-divided polyisocyanates which are obtainable by the surface reaction with from 0.1 to 25 equivalent percent of reactive group per NCO of stabilizers in relatively high molecular weight polyols and/or relatively high molecular weight polyamines having molecular weights from 400 to 6,000 optionally with addition of lower molecular weight polyols and/or aromatic amines having molecular weights of from 60 to 399, which are characterized in that unreacted quantities of stabilizers in the suspension are subsequently partially or completely deactivated by addition of substances having an acylating and/or neutralizing and/or alkylating effect and/or adsorbing effect as "deactivators". In particular, mono- and/or polyisocyanates are used as "deactivators". Deactivated suspensions obtainable in this way do not exhibit rising thickening temperatures during the production of polyurethanes, in particular in large-volume shaped articles. The present invention also relates to deactivated suspensions obtainable by the present process and to the use thereof for polyurethane production.
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