05117304 is referenced by 130 patents and cites 7 patents.

The present invention provides improved, flexible retroreflective articles based upon an optically clear, aliphatic polyurethane polymer. The aliphatic polymer has a plurality of hard chain segments of the formula

Title
Retroreflective article
Application Number
7/586005
Publication Number
5117304
Application Date
September 21, 1990
Publication Date
May 26, 1992
Inventor
Mirian D Nave
St. Paul
MN, US
James C Coderre
Lake Elmo
MN, US
Walton J Hammar
St. Paul
MN, US
Tzu Li J Huang
Woodbury
MN, US
Agent
David B Kagan
Walter N Kirn
Gary L Griswold
Assignee
Minnesota Mining and Manufacturing Company
MN, US
IPC
G02B 5/122
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