Retroreflective article containing a polyester polyurethane...

G - Physics – 02 – B

Patent

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G02B 5/128 (2006.01) C08G 18/42 (2006.01) C08G 18/66 (2006.01) C08G 18/71 (2006.01) C08G 18/72 (2006.01) C08G 18/76 (2006.01)

Patent

CA 2229784

A retroreflective article (10) includes retroreflective elements (12) partially embedded in a binder layer (14) that comprises a polyester polyurethane polymer. The polyurethane polymer is a reaction product of (i) a polyester polyol that contains an aromatic nucleus and has at least two isocyanate groups bonded non-conjugatively to the aromatic nucleus, and (ii) a polyisocyanate. A retroreflective article that employs a binder layer of this kind demonstrates extraordinary laundering durability under stringent wash conditions.

L'invention porte sur un article réfléchissant (10) comportant des éléments réfléchissants (12) partiellement noyés dans une couche de fixation (14) faite d'un polymère du type polyuréthane de polyester. Ledit polymère est un produit de réaction: (i) d'un polyester polyol comportant un noyau aromatique et présentant au moins deux groupes isocyanate liés par une liaison non conjuguée au noyau aromatique, et (ii) d'un polyisocyanate. L'invention porte également sur un article réfléchissant comportant une couche de fixation de ce type et présentant une durabilité extraordinaire dans les conditions de lavage les plus rudes.

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