Retroreflective sheet and article having retroreflectiveness

Details Retroreflective sheet and article having retroreflectiveness Retroreflective sheet and article having retroreflectiveness

G - Physics

02

B

G02B 5/12 (2006.01) G02B 1/04 (2006.01) G02B 5/124 (2006.01) G02B 5/128 (2006.01)

Patent

CA 2218712

A retroreflective article that comprises: (a) a retroreflective layer having first and second major surfaces; and (b) a cover layer juxtaposed against the first major surface, characterized in that: the cover layer comprises a surface layer, an optional intermediate layer, and a back layer, with the provisos that: (i) when the intermediate layer is present in the cover layer the intermediate layer contains a vinylidene fluoride base polymer as a primary component, and the surface layer and back layer each comprise a methyl methacrylate base polymer as a primary component; and (ii) when the intermediate layer is absent from the cover layer, the surface layer comprises a methyl methacrylate base polymer (A) and a vinylidene fluoride base polymer (F) in a weight ratio A:F of 55:45 to 95:5, and the back layer comprises a methyl methacrylate base polymer and a vinylidene fluoride base polymer with the vinylidene fluoride base polymer being the primary component.

L'invention concerne un article rétroréfléchissant comprenant: a) une couche rétroréfléchissante pourvue d'une première et d'une seconde surfaces principales, et b) d'une couche d'habillage jouxtant la première surface principale, se caractérisant en ce qu'elle comporte une couche de surface, éventuellement, une couche intermédiaire et une couche de support, ceci à condition que i) lorsque la couche d'habillage comporte la couche intermédiaire, celle-ci contienne un polymère de base de fluorure de vinylidène comme composant principal et que les couches de surface et de support comportent chacune un polymère de base de méthacrylate de méthyle comme composant principal, et que ii) lorsque la couche d'habillage ne comporte pas la couche intermédiaire, la couche de surface comprenne un polymère de base de méthacrylate de méthyle (A) et un polymère de base de fluorure de vinylidène (F) selon un rapport pondéral A/F compris entre 55/45 et 95/5 et que la couche de support comprenne un polymère de base de méthacrylate de méthyle ainsi qu'un polymère de base de fluorure de vinylidène, ce dernier constituant le composant principal.

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