Paint film-protecting sheet and method of manufacture

摘要

A paint film-protecting sheet, which is unwound from a roll for use, and in which occurrence of adhesive transfer at edges thereof is effectively prevented, and a method of manufacturing same are provided. The paint film-protecting sheet is in the form of a roll obtained by winding in a lengthwise direction a pressure-sensitive adhesive sheet formed of a substrate in continuous sheet form and a pressure-sensitive adhesive layer disposed on the substrate. The substrate comprises a resin component made primarily of polyethylene resin or polypropylene resin. The paint film-protecting sheet, after being unwound from the roll, has a percent shrinkage, in the lengthwise direction, of not greater than 1.2% when heated at 80° C. for 1 hour.

主权项

1. A paint film-protecting sheet in roll form comprising a pressure-sensitive adhesive sheet wound in a lengthwise direction with the adhesive sheet comprising a substrate in continuous sheet form and a pressure-sensitive adhesive layer disposed on the substrate, wherein
the substrate is an extruded sheet is a multilayer substrate consisting of two, three, or four layers and each layer of the substrate contains a polyethylene and a polypropylene resin in a different blend ratio compared to the other layer of the multilayer substrate, a surface of the layer directly on a pressure-sensitive adhesive layer side thereof is composed of a material containing at least 20% by mass of an ethylene component, the pressure-sensitive adhesive layer is formed of a non-crosslinking polyisobutylene-based pressure-sensitive adhesive, and the paint film-protecting sheet, after being unwound from the roll, has a percent shrinkage, in the lengthwise direction, of 1.2% or less than 1.2% when heated at 80° C. for 1 hour.