Polyurethane intermediates and products and methods of...

Details Polyurethane intermediates and products and methods of... Polyurethane intermediates and products and methods of...

C - Chemistry, Metallurgy

08

G

260/133, 400/140

C08G 18/64 (2006.01) C08G 18/67 (2006.01) C08G 18/68 (2006.01) C07G 1/00 (2006.01) C08H 6/00 (2010.01)

Patent

CA 1097617

ABSTRACT OF THE DISCLOSURE Polycarboxy-oxyalkylene polyester-ether polyol inter- mediates useful in the production of polyurethane products and methods of making the intermediates and polyurethane products are described. The polyol intermediates are made from lignin by reacting lignin with maleic anhydride, substituted maleic anhydride; or mixtures thereof to form carboxylated lignin maleic anhydride copolymers. These copolymers are then reacted with an oxyalkylating medium with or without prior hydrolysis to form the polyol intermediates. These polyester-ether polyol intermediates are then reacted with an isocyanate medium having an isocyanate with at least 2 NCO groups per molecule to produce polyurethane products with or without simultaneous foaming.

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