PROCESS FOR THE PRODUCTION OF SUBSTANTIALLY CLOSED-CELL RIGID FOAMS CONTAINING URETHANE, UREA AND BUIRET GROUPS SHOWING EXCELLENT ADHESION TO SOLID SURFACES AND THEIR USE
Substantially closed-cell rigid foams containing urethane, urea and biuret groups are produced by reacting an NCO terminated prepolymer with a compound having at least two isocyanate-reactive hydrogen atoms and a molecular weight of from about 400 to about 10,000 in the presence of a catalyst and wa...
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Main Authors | , |
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Format | Patent |
Language | English French |
Published |
08.10.2002
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Edition | 5 |
Subjects | |
Online Access | Get full text |
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Summary: | Substantially closed-cell rigid foams containing urethane, urea and biuret groups are produced by reacting an NCO terminated prepolymer with a compound having at least two isocyanate-reactive hydrogen atoms and a molecular weight of from about 400 to about 10,000 in the presence of a catalyst and water by any of the known techniques. The NCO terminated prepolymer is the reaction product of x parts by weight of an at least difunctional polyol having an OH value of less than 100 with y parts by weight of an at least difunctional polyisocyanate. The ratio of x to y is at least 1:10. The product foams are particularly useful as insulating materials. |
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Bibliography: | Application Number: CA19912044526 |