Skid-resistant pavement markings

Claim 1

A method of producing a skid-resistant substrate marking sheet comprising: providing a base sheet; coating at least a portion of an upward face of the base sheet with a liquid bonding material; embedding a plurality of ceramic skid-resistant spheroids in the coating of liquid bonding material, wherein the ceramic spheroids are characterized by having rounded surfaces and no substantial points and characterized by a Krumbein roundness of at least 0.8.; and curing the liquid bonding material to a solid adherent polymeric matrix coating with the ceramic skid-resistant spheroids partially embedded, wherein the spheroids comprise a fired ceramic made from raw materials selected from the group consisting of bauxite; refractory clay comprising a mixture of alumina and silica and less than 10 weight percent other dry ingredients, and having a proportion of alumina to silica in the range of 20:80 to 90:10; and a mixture comprising about: 10-97 parts by weight of mineral particulate; 3-90 parts by weight alumina; and at least one part by weight binder; wherein the mineral particulate comprises a ceramic mineral which melts below about 1300° C.; does not substantially sublime or volatilize below 1300° C., and vitrifies on cooling; wherein the binder is characterized by adhering the mineral particulate and alumina powder together after pelletizing but before firing.

Claim 2

A method of producing a skid-resistant substrate marking sheet comprising: providing a base sheet; coating at least a portion of an upward face of the base sheet with a liquid bonding material; embedding a plurality of ceramic skid-resistant spheroids in the coating of liquid bonding material, wherein the ceramic spheroids are characterized by having rounded surfaces and no substantial points and characterized by a Krumbein roundness of at least 0.8.; and curing the liquid bonding material to a solid adherent polymeric matrix coating with the ceramic skid-resistant spheroids partially embedded, wherein the spheroids comprise a fired ceramic made from raw materials selected from the group consisting of bauxite; refractory clay comprising a mixture of alumina and silica and less than 10 weight percent other dry ingredients, and having a proportion of alumina to silica in the range of 20:80 to 90:10; and a mixture comprising about: 10-97 parts by weight of mineral particulate; 3-90 parts by weight alumina; and at least one part by weight binder; wherein the mineral particulate comprises a ceramic mineral which melts below about 1300° C.; does not substantially sublime or volatilize below 1300° C., and vitrifies on cooling; wherein the binder is characterized by adhering the mineral particulate and alumina powder together after pelletizing but before firing.