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US 4,248,932 AGranted
Extended-life pavement-marking sheet material
AssigneeMinnesota Mining and Manufacturing Company
InventorsChi F. Tung, George W. Frost, Jr.
Life of this patent
Estimating the term…
Abstract
A new pavement-marking sheet material comprises a conformable base sheet, a flexible top layer adhered to the base sheet, and glass microspheres or other particulate material partially embedded and strongly supported and adhered in the top layer.
Claims21
Pavement-marking sheet material comprising
- (a) a base sheet that is conformable to a roadway surface;
- (b) a top layer adhered to one surface of the base sheet and reacted to a substantially infusible, insoluble, and flexible state in which the top layer conforms and remains adhered to the base sheet without rupture even when the sheet material is wrapped around a one-millimeter-diameter mandrel;
- the top layer containing coloring agents sufficient to color the sheet material for utility as a traffic-control marking;
- and
- (c) a monolayer of particles partially embedded in the top layer and partially exposed above the top layer;
- the top layer encircling the particles such that at points one radius removed from the periphery of an average-diameter particle, the top layer has a thickness of at least one-third the particle diameter and has receded below its level on the particle by no more than one-third the particle diameter, whereby the particles are retained in the top layer and protect the top layer from wear.
3 more elements
Pavement-marking sheet material comprising
- (a) a base sheet that conforms under pressure to a roadway;
- (b) a top layer adhered to one surface of the base sheet and comprising an epoxy resin having on the average more than one reactive epoxy group per molecule, a flexibilizing polymer which provides at least 5 weight-parts of elastomeric segments in the top layer per 100 weight-parts of epoxy resin segments, and coloring agents sufficient to color the top layer for utility as a traffic-control marking;
- the top layer conforming and adhering to the base sheet without rupture even when the sheet material is wrapped around a one-millimeter-diameter mandrel;
- and
- (c) a monolayer of particles partially embedded in the top layer and partially exposed above the top layer;
- the top layer encircling the particles such that at points one radius removed from the periphery of an average-diameter particle, the top layer has a thickness of at least one-third the particle diameter and has receded below its level on the particle by no more than one-third the particle diameter, whereby the particles are retained in the top layer and protect the top layer from wear.
3 more elements
Pavement-marking sheet material comprising
- (a) a base sheet that conforms under pressure to a roadway surface;
- (b) a top layer between about 25 and 250 micrometers thick adhered on one surface of the base sheet and comprising
- (i) diglycidyl ether of hydrogenated bisphenol A;
- (ii) flexibilizing polymer which provides at least 5 parts of elastomeric segments per 100 parts of epoxy resin segments in the top layer, and which carries reactive groups through which the flexibilizing polymer is reacted with the diglycidyl ether of bisphenol A;
- and
- (iii) coloring agents sufficient to color the sheet material for utility as a traffic-control marking;
- the top layer conforming and adhering to the base sheet without rupture even when the sheet material is wrapped around a one-millimeter-diameter mandrel;
- and
- (c) a monolayer of inorganic particles partially embedded in the top layer and partially exposed above the top layer, said particles being contacted by an adhesion-promoting agent having an inorganophilic portion and an organophilic portion;
- the top layer being filleted around the particles in a flat fillet such that at points one radius removed from the periphery of an average-diameter particle;
- the top layer has a thickness of at least one-third the particle diameter and has receded below its level on the particle by no more than one-third the particle diameter, whereby the particles are retained in the top layer and protect the top layer from wear.
8 more elements
Dependencies are inferred from the claim text.