Ultra-high-index glass microspheres and products made therefrom with a fluoropolymer and an ester polymer blend
AssigneeMinnesota Mining and Manufacturing Company
InventorChi F. Tung
Life of this patent
Estimating the term…
Abstract
Compositions comprising copolymers of methyl methacrylate and ethyl acrylate and of vinylidene fluoride and hexafluoropropylene may be blended to form transparent compositions of low refractive index, making them useful in retroreflective products as a layer in which glass microspheres are embedded.
Claims5
Retroreflective film comprising a layer in which glass microspheres are at least partially embedded, said layer comprising a transparent blend of 1 to 99 weight-parts of a copolymer that comprises about 3 parts of methylmethacrylate and 1 part of ethyl acrylate and 99 to 1 weight-parts of a copolymer that comprises about 3 parts of vinylidene fluoride and 1 part of hexafluoropropylene.
Coating composition that comprises a blend of 1 to 99 of weight-parts of a copolymer that comprises about 3 parts of methyl methacrylate and 1 part of ethyl acrylate and 99 to 1 weight-parts of a copolymer that comprises about 3 parts of vinylidene fluoride and 1 part of hexafluoropropylene and glass microspheres dispersed in the blend and hemispherically coated with specularly reflective metal.
Dependencies are inferred from the claim text.