Polyurethane prepolymers having a low residual monomer content

Details Polyurethane prepolymers having a low residual monomer content Polyurethane prepolymers having a low residual monomer content

C - Chemistry, Metallurgy

08

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402/132, 400/741

C08G 18/10 (2006.01) C08G 18/72 (2006.01) C08G 18/75 (2006.01) C08G 18/76 (2006.01) C09J 175/04 (2006.01)

Patent

CA 1255035

ABSTRACT OF THE DISCLOSURE Polyurethane prepolymers in which polyhydric alco- hols are initially reacted with the faster reacting isocyanate group of an asymmetrical diisocyanate with the slowly reacting group remaining intact, after which the reaction products are combined with a symmetrical diisocyanate of which the equally reactive isocyanate groups again react more quickly than the slowly react- ing groups of the first polyfunctional isocyanate com- pound. The products obtained by this process are dis- tinguished by a low residual monomer content.

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