Use of a crosslinked polyurethane adhesive on a retroreflective

Details Use of a crosslinked polyurethane adhesive on a retroreflective Use of a crosslinked polyurethane adhesive on a retroreflective

1996-12-30

1998-10-13

Nakarani, D. S.

Stock material or miscellaneous articles

Composite

Of polyamidoester

359536, 359538, 359540, 359541, 4284233, 4284237, 4284244, B32B 2740, G09F 1316

Patent

active

058209883

ABSTRACT:
A retroreflective sheeting have a multitude of retroreflective elements that include a layer of optical elements and a reflective element(s) that is positioned functionally behind the optical elements. The retroreflective elements are supported by a polymeric layer, and an adhesive layer positioned below the support layer. The adhesive layer contains a polyurethane crosslinked by at least an isocyanate compound. The polyurethane is polymerized from a component containing a polyol having at least one alkyl side chain in a molecule, and the adhesive has (i) a storage modulus of about 2.times.10.sup.7 to 8.times.10.sup.7 dyne per square centimeter when measured in a tensile mode at a frequency of 35 Hz and 25.degree. C., and (ii) a softening point of about 80.degree. C. to less than 200.degree. C.

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Patent Abstracts of Japan, JP 57-109877A, vol. 006, No. 202, 13 Oct. 1982.
Patent Abstracts of Japan, JP 5-271376A, vol. 018, No. 046, 25 Jan. 1994.

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