Reactive hot-melt adhesive and its applications

Details Reactive hot-melt adhesive and its applications Reactive hot-melt adhesive and its applications

C - Chemistry, Metallurgy

09

J

C09J 175/04 (2006.01) B32B 5/02 (2006.01) B32B 27/12 (2006.01) C08G 18/10 (2006.01) C09J 7/02 (2006.01) D06M 17/10 (2006.01)

Patent

CA 2329836

A reactive hot-melt adhesive which is excellent in storage stability, initial adhesion, and heat resistance after cure and can be formed into various shapes; and a composite adhesive sheet containing the adhesive. The adhesive comprises as the main component a blocked urethane prepolymer obtained by reacting a linear urethane prepolymer having isocyanate groups with (A) an aliphatic monohydric alcohol having a hydroxyl value of 200 to 560 and (B) a blocking agent which is a compound other than the compound (A) and optionally with a low-molecular diol having a hydroxyl value exceeding 400.

L'invention concerne un adhésif thermofusible réactif dont la stabilité au stockage, l'adhérence initiale et la résistance à la chaleur après durcissement sont excellentes et qui peut adopter plusieurs formes. L'invention concerne en outre une feuille adhésive composite contenant ledit adhésif. Cet adhésif comprend comme principal constituant un polymère uréthane séquencé résultant de la réaction d'un prépolymère uréthane linéaire comportant des groupes isocyanate avec (A) un alcool monohydrique aliphatique à indice hydroxyle compris entre 200 et 560 et (B) un agent de séquençage qui est un composé différent du composé (A) et éventuellement avec un diol de faible poids moléculaire dont l'indice hydroxyle dépasse 400.

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