C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 75/12 (2006.01) C03C 25/24 (2006.01) C03C 25/32 (2006.01) C08G 18/08 (2006.01) C08G 18/32 (2006.01) C08G 18/50 (2006.01) C08G 18/70 (2006.01) C08G 18/80 (2006.01) C08J 5/24 (2006.01) D04H 1/64 (2006.01)
Patent
CA 2064337
Mo3587 MD-90-66-PU AQUEOUS POLYISOCYANATE DISPERSIONS WITH REDUCED ISOCYANATE CONTENTS AND THEIR USE FOR THE PRODUCTION OF FIBERGLASS MATS ABSTRACT OF THE DISCLOSURE The present invention is directed to an aqueous polyisocyanate dispersion which has an isocyanate content of at least 0.5% by weight, based on the weight of the polyiso- cyanate, and is prepared by a) dispersing in water a polyisocyanate which has an isocyanate content of at least 12% by weight and b) reacting the dispersed polyisocyanate with i) a primary or secondary monoamine containing at least one hydroxyl group in an amount sufficient to provide an equivalent ratio of amino groups to isocyanate groups of 0.1:1.0 to 0.7:1.0 and ii) a polyamine having primary and/or secondary amino groups and a molecular weight of 400 or less in an amount sufficient to provide an equivalent ratio of amino groups to isocyanate groups of 0.1:1.0 to 0.4:1.0, wherein component i) is mixed with the dispersed polyisocyanate either before or during the mixing of component ii) and provided that the equivalent ratio of amino groups from both components i) and ii) does not exceed 0.95:1Ø The present invention is also directed to a process for the preparation of a fibrous mat by treating fibers with the dispersed polyisocyanate before the isocyanate content of the dispersed polyisocyanate is less than 0.5% by weight, based on the weight of the polyisocyanate. Finally, the present invention is directed to the fibrous mats obtained in accordance with this process. Mo3587
Markusch Peter H.
Sarpeshkar Ashok M.
Tirpak Robin E.
Corporation Bayer
de Gagne Jacqueline A.
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