Reactive polyurethane compositions with low residual monomer...

C - Chemistry – Metallurgy – 08 – G

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

Patent

CA 2463586

Reaction products from 2,4'-diphenylmethane diisocyanate with a content of at least 95 wt.% of 2,4' isomer with at least one polyether-polyol and/or polyalkylene glycol with a molecular weight of less than 1,000 and/or one crystalline or partly crystalline or vitreously amorphous polyester-polyol and optionally polyester-polyols and/or polyether-polyols which are liquid at room temperature and have molecular weights of greater than 1,000 can be converted into adhesive compositions which have a very low content of monomeric diisocyanate'of less than 0.5, preferably less than 0.25 wt.%. Such hot melt adhesive compositions have a high melt stability and a low viscosity, in addition to the low content of monomeric diisocyanate.

L'invention concerne des produits de réaction provenant de 2,4'-diphénylméthane-diisocyanate avec une proportion d'au moins 95 % en poids de 2,4'-isomères avec au moins un polyétherpolyol et/ou un polyalkylène glycol avec un poids moléculaire inférieur à 1.000 et/ou un polyesterpolyol amorphe cristallin ou partiellement cristallin ou vitreux, ainsi qu'éventuellement des polyesterpolyols liquides à température ambiante et/ou des polyétherpolyols de poids moléculaires inférieurs à 1.000, qui peuvent être mis à réagir pour former des compositions d'adhésifs, qui présentent une très faible teneur an diisocyaante monomère, inférieure à 0,5, de préférence inférieure à 0,25 % en poids. Les compositions de colles à fusion de ce type présentent, outre leur faible teneur en diisocyanate monomère, une grande stabilité à la fusion et une faible viscosité.

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