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AssigneeSika Technology AG
InventorsSven Reimann, Nicole Kube, Michael Schlumpf
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A polyester urethane polymer containing isocyanate groups and being liquid at ambient temperature, obtained by reacting at least one monomeric diisocyanate and dimer fatty acid-based polyester diol having OH-number ranging between 28 and 120 mg KOH/g in NCO/OH ratio of at least 3/1, and by subsequently removing large part of monomeric diisocyanate by means of suitable separation process, wherein polymer has NCO content ranging between 1.5 and 6% by wt. and maximum monomeric diisocyanate content of 0.5% by wt. The polymer permits the production of moisture-curing polyurethane compositions for application in ambient temperatures, having improved properties in terms of open time, adhesion, application and weather resistance, with unchanged good properties of storage stability, curing rate, strength, ductility, elasticity and hazardous material classification. Compositions of this type are particularly suitable for use as elastic adhesives in replacement glass for vehicles.
A room temperature liquid polyester urethane polymer containing isocyanate groups, obtained from the reaction of reactants consisting of at least one monomeric diisocyanate and a dimer fatty acid-based polyester diol having an OH number in the range from 28 to 60 mg KOH/g in an NCO/OH ratio of at least 3/1, followed by removal of a majority of the monomeric diisocyanate by means of a suitable separation method,
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