Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1985-11-18
1987-05-05
McCamish, Marion C.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
15624411, 428210, 428325, 4284242, 428913, G02B 5128
Patent
active
046632131
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.
REFERENCES:
patent: 2407680 (1945-03-01), Palmquist et al.
patent: 3190178 (1961-06-01), McKenzie
patent: 4025159 (1977-05-01), McGrath
patent: 4025674 (1977-05-01), Mizuochi
patent: 4511210 (1985-04-01), Tung et al.
Bailey Terry R.
Belisle Louis C.
Kult Roger R.
McCamish Marion C.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Smith James A.
Tamte Roger R.
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