Reinforced pavement-marking sheet material
AssigneeMinnesota Mining and Manufacturing Company
InventorStanley J. Jordan
Life of this patent
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Abstract
Pavement-marking sheet material which comprises a non-crosslinked elastomeric precursor such as acrylonitrile-butadiene polymer; a thermoplastic polymer such as polyethylene which reinforces the sheet material, e.g., by orientation of the thermoplastic polymer so that the calendered product exhibits greater tensile strength downweb than crossweb; and a particulate inorganic filler, which preferably includes platelet-type fillers such as talc, mica, or magnesium silicate.
Claims17
Pavement-marking composition in sheet form comprising 100 parts of non-crosslinked elastomer precursor, at least 5 parts of a thermoplastic reinforcing polymer which is dispersed in the elastomer as a separate phase and softens at a temperature between about 75.degree. and 200.degree. C., and a particulate inorganic filler dispersed in the composition;
- said composition being processable on calendering rolls to a thickness between about 1/4 and 5 millimeters, and in sheet form having a greater tensile strength downweb than it has in the crossweb direction.
Pavement-marking composition in sheet form comprising 100 parts of non-crosslinked elastomer precursor;
- at least 5 parts of a polyethylene reinforcing polymer which is dispersed in the elastomer as a separate phase and is selected from linear low-density polyethylene and high-density polyethylene having a molecular weight of at least about 20,000 and a low-density polyethylene having a molecular weight of at least about 75,000;
- and a particulate inorganic filler dispersed in the composition;
- said composition being processable on calendering rolls to a thickness between about 1/4 and 5 millimeters, and in sheet form having a tensile strength of at least 10 kilograms per square centimeter and an abrasion loss in the test described herein of no more than about 5 grams;
- the tensile strength downweb being significantly greater than the tensile strength crossweb.
Dependencies are inferred from the claim text.