Patent · US Expired

Retroreflective articles having multilayer films and methods of manufacturing same

US6677028B1 · kind B1 · utility

62Cited by

46References

30Claims

0Family size

Assignee

3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

James E. Lasch · Oakdale, US
Paul J. Wang · Saratoga, US
Raymond L. Lucking · Hastings, US
Terry R. Bailey · Woodbury, US
Kanta Kumar · Woodbury, US
Michael A. Essien · Woodbury, US
Jeffrey D. Janovec · River Falls, US
Jaime R. Ojeda · Woodbury, US
Michael D. Currens · Eagan, US

Key dates

Filing date	Aug 10, 2000
Grant date	Jan 13, 2004
Priority date	—
Expiry date	Nov 15, 2020

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31587
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Retroreflective articles having multilayer films are useful for commercial graphics and retroreflective products, such as roll-up signs for highway transportation safety. The articles comprise multilayer films having at least one layer of polyurethane and at least one layer of a copolymer of alkylene and at least one non-acidic, polar co-monomer. Articles having the new multilayer films provide the same or improved performance, are less expensive, and offer improved methods for manufacturing, when compared to prior articles.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.