RAISED PAVEMENT MARKER THAT USES PRESSURE SENSITIVE ADHESIVE

摘要

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 .degree.C; and (ii) a minimum shear modulus of about 1 .times. 10 5 Pa at an impact frequency of about 100 radians/s at 25 .degree.C; and (iii) a shear modulus value of about 2 .times. 10 4 to 2 .times. 10 5 Pa at a frequency of 1 rad/sec at 25 .degree.C. Raised pavement markers that use a pressure sensitive adhesive meeting parameters (i)-(iii) can demonstra te good adhesion to roadways and are capapble of withstanding repeated impacts from motor vehicle tires.