Polyurethane synthesis from functional group terminated...

C - Chemistry – Metallurgy – 08 – G

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C08G 18/46 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/66 (2006.01) C08G 63/688 (2006.01) C08G 63/91 (2006.01)

Patent

CA 2222342

Disclosed is a process for producing water-dispersible polyurethanes by forming an isocyanate-di- substituted prepolymer and reacting it with a chain extender. The prepolymer can be formed by reacting a diisocyanate with an ethylenically unsaturated precursor which is preferably formed by condensation polymerization of reactants including ethylenically unsaturated reactants and then sulfonating the ethylenic unsaturation of said polymeric precursor by reacting it with a sulfonating agent such as bisulfite, metabisulfite, or a mixture thereof.

On divulgue un procédé pour produire des polyuréthanes dispersibles dans l'eau, en formant un prépolymère isocyanate-disubstitué et en le faisant réagir avec un allongeur de chaîne. Le prépolymère peut être formé en faisant réagir un diisocyanate avec un précurseur éthyléniquement insaturé qui est préférablement formé par polymérisation par condensation de réactants comprenant des réactants éthyléniquement insaturés et par sulfonation dudit précurseur polymérique à insaturation éthylénique en le faisant réagir avec un agent de sulfonation comme le bisulfite, le métabisulfite ou un mélange de ces derniers.

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