Heat-activatable polyurethane coatings and their use as...

C - Chemistry – Metallurgy – 09 – J

Patent

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C09J 7/02 (2006.01) B32B 27/32 (2006.01) C08G 18/08 (2006.01) C08G 18/66 (2006.01) C08J 7/04 (2006.01)

Patent

CA 2344340

A coated sheet has a heat-activatable adhesive coating of thermoplastic polyurethane having a melting point of 40 to 100 ~C. The coating may be crystalline and have an average crystal size below 10 µm. The coating, when molten, may remain tacky for a period of from 2 to 50 seconds. Preferred processes comprise heat activating the coating and subsequently cold or cool sealing, for instance to form a packet around a heat-sensitive material.

Une feuille est revêtue d'une couche adhésive de polyuréthane thermoplastique pouvant être réactivé par la chaleur et dont le point de fusion est compris entre 40 et 100 ·C. Le revêtement peut être cristallin et comporter des cristaux dont la taille moyenne est inférieure à 10 µm. En outre, ce revêtement, lorsqu'il est fondu, peut rester collant pendant une période comprise entre 2 à 50 secondes. Des procédés préférés consistent à réactiver ce revêtement par la chaleur, puis à le souder par pression à froid ou à température ambiante, par exemple pour empaqueter une matière thermosensible.

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