Durable pavement marking tape with screencoated polyurethane...

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/04 (2006.01) B32B 3/12 (2006.01) B32B 27/08 (2006.01) E01F 9/04 (2006.01)

Patent

CA 2237358

A pavement marking material comprises a flexible base sheet (11) that is conformable to an irregular pavement surface. A durable, wear-resistant polymeric top layer (18) which is discontinuous in two directions is affixed to one surface of the base sheet. The polymeric top layer is discontinuous in both the cross web direction and the down web directions. This discontinuity in two directions is obtained by means of a continuous process such as a rotary screen printing process. A rotary screen printing process is much more efficient if the composition to be coated has an infinite pot life at application temperatures. This infinite pot life is attained through the use of a blocked isocyanate crosslinker. The discontinuous nature in two directions of the polymeric top layer provides for increased initial conformance of the pavement marking to irregular pavement surfaces. The discontinuous nature of the polymeric top layer also reduces elastic tensile stresses which tend to build up in continuous top layers and cause adhesive failure. A plurality of particles, retroreflective microspheres and/or skid- resistant particles, are embedded in and protrude from the non-continuous top layer.

L'invention a trait à un matériau de marquage de chaussée comportant une feuille souple de base (11) pouvant épouser les irrégularités superficielles de la chaussée. On appose sur l'une des faces de la feuille de base une couche supérieure polymère (18) durable, résistante à l'usure et d'une structure discontinue dans deux sens, transversal et descendant. On obtient cette discontinuité en mettant en oeuvre un processus en continu tel qu'une impression au cadre rotatif, technique se révélant encore plus efficace si la durée d'utilisation de la composition d'enduisage est très longue. L'emploi d'un agent de réticulation bloqué, à base d'isocyanate, garantit une telle durée. La discontinuité de structure, dans les deux sens, de la couche supérieure polymère, renforce la conformité initiale du marquage de chaussée avec les irrégularités superficielles de celle-ci et réduit également les contraintes de traction ayant tendance à s'accumuler dans les couches supérieures et entraînant des défaillances au niveau de l'adhérence. Plusieurs particules, microsphères rétroréfléchissantes et/ou particules antidérapantes, sont prises dans la couche supérieure non continue et dépassent de celle-ci.

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