Pavement marking article and raised pavement marker that uses pressure sensitive adhesive

摘要

A pavement marking article that has an adhesive composition for adhering the article to a pavement substrate, where the adhesive composition includes a reaction product of an acrylic acid ester of a monohydric alcohol whose homopolymer has a Tg less than 0° C., a non-polar ethylenically unsaturated monomer, and 0-10 parts by weight of a polar ethylenically unsaturated monomer. Preferably the amount of the acrylic acid ester is about 60-90 parts by weight, and the amount of the non-polar ethylenically unsaturated monomer is about 10-40 parts by weight. ;Also, a raised pavement marker that comprises: ;(a) a pavement marker body having upper and lower surfaces and an apparent flexural modulus of at least about 50,000 psi and ;(b) a pressure sensitive adhesive layer disposed upon the lower surface of the marker, wherein the adhesive has: ;(i) a transition region that begins at a frequency of about 10,000 radians/s or more and extends to a frequency of about 100 radians/s or less at about 25° C.; and ;(ii) a minimum shear modulus of about 1×105 Pa at an impact frequency of about 100 radians/s at 25° C.; and ;(iii) a shear modulus value of about 2×104 to 2×105 Pa at a frequency of 1 rad/sec at 25° C. ;Raised pavement markers that use a pressure sensitive adhesive meeting parameters (i)-(iii) can demonstrate good adhesion to roadways and are capable of withstanding repeated impacts from motor vehicle tires.