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Cellular retroreflective sheeting

  • US 4,025,159 A
  • Filed: 02/17/1976
  • Issued: 05/24/1977
  • Est. Priority Date: 02/17/1976
  • Status: Expired due to Term
First Claim
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1. Retroreflective sheeting comprising (1) a base sheet having a layer of retroreflective elements disposed over one of its surfaces;

  • (2) a cover sheet disposed in spaced relation from the layer of retroreflective elements; and

    (3) a network of narrow intersecting bonds extending between said cover sheet and base sheet and comprising binder material thermoformed at the point of contact between said bonds and at least one of said cover sheet and base sheet so as to adhere the two sheets together and form a plurality of cells within which retroreflective elements are hermetically sealed;

    characterized in that the binder material is selected from materials that show increased adhesion to said at least one of the cover sheet and base sheet when a solid layer of the material that has been previously laminated to said sheet is cured, and further characterized in that the binder material is cured in situ after being thermoformed, whereby the bonds have increased bond strength to the cover sheet and base sheet.

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