Novel moisture-crosslinking pu hot-melt adhesives

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 175/12 (2006.01) C08G 18/10 (2006.01) C08G 18/32 (2006.01) C08G 18/78 (2006.01) C08G 18/79 (2006.01) C08G 18/80 (2006.01) C08G 18/83 (2006.01) C09J 5/06 (2006.01)

Patent

CA 2212598

Disclosed is a moisture-crosslinking polyurethane hot-melt adhesive which comprises a reaction product of: A) an NCO prepolymer having at least two NCO groups which are aliphatic, cycloaliphatic, (cyclo)aliphatic or aromatic NCO groups and having an NCO content of 1-23%; with B) a polyamine having at least two sterically hindered amino groups and being selected from the group consisting of: 1. a polyamine containing at least two 2,2,6,6-tetramethylpiperidine group of the formula: (see fig. I) and 2. a polyamine of the formula: (see fig. II) (wherein n is an integer of 3 to 6) in which 1-0.6 sterically hindered amino group reacts with one NCO group. The adhesive exhibits a very high initial strength.

On divulgue un adhésif de polyuréthane thermofusible à réticulation par l'humidité qui comprend un produit de réaction : A) d'un prépolymère de NCO portant au moins deux groupes NCO qui sont des groupes NCO aliphatiques, cycloaliphatiques, (cyclo)aliphatiques ou aromatiques et ayant une teneur en NCO de 1-23 %; avec B) une polyamine portant au moins deux groupes amino stériquement encombrés et choisie parmi le groupe constitué : 1. d'une polyamine contenant au moins deux groupes 2,2,6,6-tétraméthylpipéridine de formule : (voir fig. I) et 2. d'une polyamine de formule : (voir fig. II) (où n est un nombre entier compris entre 3 et 6) dans laquelle 1-0,6 groupe amino stériquement encombré réagit avec un groupe NCO. L'adhésif se caractérise par une très grande résistance initiale.

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