Surface protective composition and surface protective film

Abstract

A surface protection composition wherein the water contact angle X1 obtained by method 1 is 60° or more, and the water contact angle X2 obtained by method 2 is 60° or less. (Method 1) A film 1 comprising the surface protection composition is formed on a substrate. Next, purified water is dropped onto the film 1 according to JIS R3257:1999, and the water contact angle of the film 1 immediately after dropping is measured and set as the water contact angle X1. (Method 2) Film 1 is obtained in the same manner as (Method 1). Under conditions of illuminance of 20 mW / cm², irradiation time of 150 seconds, and cumulative light intensity of 3000 mJ / cm², the obtained film 1 is irradiated with a high-pressure mercury lamp to obtain a film 2. Next, the water contact angle of the film 2 60 seconds after the purified water is dropped onto the film 2 is measured according to JIS R3257:1999 and set as the water contact angle X2. A surface protective composition in which a water contact angle X1 obtained by Method 1 set forth below is 60 degrees or greater, and a water contact angle X2 obtained by Method 2 set forth below is 60 degrees or less. Method 1: A film 1 including the surface protective composition is formed on a substrate. Next, in accordance with JIS R3257:1999, purified water is dropped onto the film 1, the water contact angle of the film 1 immediately after the dropping is measured, and that value is designated as the water contact angle X1. Method 2: A film 1 is obtained in the same manner as in Method 1. The obtained film 1 is irradiated with light using a high-pressure mercury lamp under conditions of irradiance of 20 mW / cm2, irradiation time of 150 seconds, and a cumulative light dose of 3000 mJ / cm2, thereby obtaining a film 2.Next, in accordance with JIS R3257:1999, the water contact angle of the film 2 is measured 60 seconds after dropping of purified water onto the film 2, and that value is designated as the water contact angle X2.