High green strength reactive hot melt by a prepolymerization...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/12 (2006.01) C08G 18/32 (2006.01) C08G 18/42 (2006.01) C08G 18/66 (2006.01) C08G 18/72 (2006.01) C09J 175/06 (2006.01)

Patent

CA 2339822

It has been found, in accordance with the present invention, that a high molecular weight polyester, when reacted with a poly or diisocyanate in an NCO:OH ratio of 0.7:1 to 1:0.7, produces a high molecular weight hydroxy terminated prepolymer which is stirrable above 120°C and sufficiently stable prior to reaction with additional di or polyisocyanate or optional additional polyols to produce a reactive hot melt adhesive.

Dans cette invention, on a découvert que lorsqu'on fait réagir un polyester présentant un poids moléculaire élevé avec un poly ou diisocyanate dans un taux de NCO:OH de 0,7:1 à 1:0,7, il produit un prépolymère à terminaison hydroxy qui présente un poids moléculaire élevé et qui peut être remué au dessus de 120 DEG C et qui est suffisament stable avant la réaction avec un autre di ou polyisocyanate ou, éventuellement, avec d'autres polyols pour produire un adhesif thermofusible réactif.

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