PIPA-POLYOL PREPARATION METHOD Russian patent published in 2004 - IPC

FIELD: polymer production.

SUBSTANCE: invention relates to a method for preparation of polyol composition containing material in the form of dispersed particles constituting 30 to 80% of the weight of composition. Isocyanate-reactive compound containing multiple hydroxyl group, primary and/or secondary amino groups, and having equivalent mass up to 400 is emulsified in polyol having equivalent mass 1000 to 5000 and average hydroxyl functionality 2-6 at 60-100^оС under mixing conditions at high shear loadings. Polyisocyanate is gradually added to thus prepared emulsion maintaining temperature within 60 to 120^оС and preserving high shear loading conditions. When all amount of polyisocyanate is added, reaction mixture is allowed to stay for further 10 min to 2 h at temperature within 60 to 20^оС and without agitation, after which resulting composition is cooled to room temperature.

EFFECT: enabled preparation of PIPA-polyols with high content of material in the form of particles with low viscosity and good stability.

8 cl