Patent ID: RE40723

Claim:
A sheet for protecting a melamine-alkyd, melamine-acrylic or urethane automotive paint film wherein said sheet comprises a plastic substrate having a thickness of 10 to 100 μm made of a polypropylene and polyethylene blend and having formed on one side thereof a layer of a rubber-based pressure-sensitive adhesive having a SP value of at least 1 larger or smaller than the automotive paint film, a dynamic modulus of from 4×10 5 to 3×10 6 dyne/cm 2 at 60° C., an adhesion strength of 100 to 1,000 g/20 mm and a thickness of 5 to 50 μm, said adhesive comprising an isobutylene-based polymer which is not curable, whereby said sheet has a ratio of (i) adhesion strength at 23° C. after exposure for 100 hours in a sunshine weatherometer to (ii) initial adhesion strength of from 1.01 to 3.86.