MONOMER DEPLETED PREPOLYMER COMPOSITION OF ASYMMETRIC POLYISOCYANATE AND STERICALLY HINDERED POLYATOMIC ALCOHOLS Russian patent published in 2009 - IPC C08G18/48 C08G18/66 C08G18/12 C08G18/18 C08J9/14 C09J175/04 

FIELD: chemistry.

SUBSTANCE: invention refers to vessel under pressure intended for obtaining of 1-, 1.5- and/or 2-component foamed polyurethane, sealing foams and spray glues based on polyurethane e.g. for gluing of mat-type insulant and roof coverings with each other or with a base. This vessel contains prepolymer based on polyisocyanate and polyatomic alcohols, foaming means as well as usual auxiliary means such as antipyrens, stabilisators, openers, catalysts etc. The said prepolymer represents the monomer depleted prepolymer based on polyurethane and is obtained by inerreaction of asymmetric polyisocyanates having at least two isocyanate groups with one of them interreacting preferably with sterically hindered polyatomic alcohols. Two sterically hindered polyatomic alcohols have at least two hydroxyl functional groups, at least one of them is secondary or tertiary hydroxyl group. The foams are obtained from vessel under pressure due to very strong curing. The latter is caused by decrease of the monomer content in prepolymer due to chemical reactions 0°-5°C.

EFFECT: foam good shrinking properties, enhanced elasticity at low temperatures.

9 cl, 1 ex