The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 1987
Filed:
Nov. 18, 1985
Terry R Bailey, Woodbury, MN (US);
Roger R Kult, Maplewood, MN (US);
Louis C Belisle, Oakdale, MN (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
Retroreflective sheeting has a flat, transparent cover film of excellent clarity and weatherability that resists dirt accumulation while also having good flexibility, conformability and stretchability, this desirable combination of properties being achieved when the cover film includes a urethane inner layer and an acrylic outer layer. The acrylic outer layer preferably is a copolymer of 60 to 80 parts of methyl methacrylate and correspondingly 40 to 20 parts by weight of at least one of ethyl acrylate, n-butyl acrylate, and-butyl methacrylate. The urethane inner layer comprises a thermoplastic aliphatic urethane polymer.