SLIGHTLY MODIFIED PREPOLYMERS AND THEIR USES

An isocyanate-terminated prepolymer C having an NCO content of from >=26% by mass to @31.0% by mass is obtainable from the reaction of an isocyanate composition A having a viscosity at 25° C. of from >=60 mPas to @800 mPas, comprising from >=25% by mass to @60% by mass MDI and from >=40%...

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Bibliographic Details
Main Authors PIRKL HANS-GEORG, SCHMIDT MANFRED, BRAAK JOHANNES, ALBERS REINHARD, ROERS ROLF
Format Patent
LanguageEnglish
Published 18.07.2013
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Summary:An isocyanate-terminated prepolymer C having an NCO content of from >=26% by mass to @31.0% by mass is obtainable from the reaction of an isocyanate composition A having a viscosity at 25° C. of from >=60 mPas to @800 mPas, comprising from >=25% by mass to @60% by mass MDI and from >=40% by mass to 75% by mass pMDI, wherein the sum of the amounts of those components is @100% by mass, with a bifunctional polyester ether polyol B having an OH number of >=200 mg(KOH)/g and @500 mg(KOH)/g, obtained from the reaction of a dicarboxylic acid/dicarboxylic acid derivative with at least one polyol and with an epoxide, wherein the polyester ether polyol B is used in amounts of from >=1.5% by mass to @6.0% by mass, based on the sum of the masses of A and B. The invention further provides a PUR/PIR polymer produced from the prepolymer C, its use and composite elements based thereon.
Bibliography:Application Number: US201113809147