RIGID POLYURETHANE FOAM MANUFACTURE PROCESS Russian patent published in 2006 - IPC C08G18/48 C08G18/18 C08G18/32 

FIELD: polymer production.

SUBSTANCE: invention provides process for manufacture of rigid polyurethane foams suitable as heat-insulation coatings via interaction of polyisocyanates with polyether component in presence of foaming and curing catalysts, foaming agent, foaming control agent, and fire retardant by way of bringing polyisocyanates into contact with hydroxyl-containing mixture comprising hydroxyl-containing compound, polyether supplemented by cyclic compound of formula I (appendix 1). As low-toxicity catalyst serving for cross-linking chains, cyclic compound of formula II (appendix 2) is additionally used in amounts from 1 to 200 wt parts per 100 wt parts hydroxyl-containing compound and ether. Invention assures manufacture of foamed plastic with heat resistance at a level of 210°C, compaction stress 0.48 MPa, and moisture absorption 6.8% without significant increase in brittleness of material, which allows material to be used in construction, power engineering, ship and automobile building, oil-and-gas and refrigeration industries. Appendix 1: . Appendix 2: .

EFFECT: improved performance characteristics of polyurethane foam.

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