Surface protective film and laminate formed therefrom
AssigneeTeijin Limited
InventorHiroyuki Sumi
Life of this patent
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Abstract
A surface protective film which can be used in the production of components associated with a liquid crystal display such as a polarizer to improve productivity and yields since no air bubbles are trapped when stuck to a substrate having unevenness in the surface and since the adhesion is low and a change of the adhesion with the passage of time is small and which can be highly transparent and improve inspectability by using a polyester film having little particles as a base material. It is treated by an antistatic agent or a release agent the surface of the surface protective film opposite to the surface in which the adhesive layer is formed, as a result, control of static electrification in case the surface protective film is peeled off and removal of the dust adhering to the surface can be made easy.
Claims18
A surface protective film for protecting the surface of a substrate, which comprises a polyester film (A) and an adhesive layer (B) formed on one of the surfaces of the polyester film (A), which adhesive layer has a critical bounce coefficient of not more than 0.5, wherein the adhesive layer (B) satisfies all of the following conditions:
- (1) the dry adhesion against a stainless steel plate is 30 to 500 mN/25 mm;
- (2) the rate of change in the dry adhesion after being kept stuck at 60° C. for a week is 0.5 to 2.0 times;
- (3) the size of a ball used in ball tack measurement is {fraction (2/32)} to {fraction (10/32)} inches;
- (4) the thickness of the adhesive layer (B) is 3 to 50 μm;
- (5) the adhesive layer (B) has a center line average surface roughness (Ra) of 2 to 500 nm.
Dependencies are inferred from the claim text.