Release film

Abstract

[Problem] To provide a mold release film that has a light release force both before and after heating, is capable of having a light release force even when released at a high speed, and includes substantially no silicone. [Solution] The mold release film according to claim 1, characterized by having a mold release layer laminated on a base material film, the mold release layer including at least a long-chain-alkyl-containing acrylic resin (A) and a crosslinking agent (B) and including substantially no silicone component, wherein the ratio a / b of the weight (a) of the long-chain-alkyl-containing acrylic resin to the weight (b) of the crosslinking agent included in the mold release layer satisfies the following Expression (I). (I): 0.1 ≦ a / b ≦ 7.0.

Claims

1. A release film comprising a release layer laminated onto a base film, the release layer containing at least a long-chain alkyl-containing acrylic resin (A), a crosslinking agent (B), and a release agent (C), and substantially free of silicone components, The molecular weight of the long-chain alkyl-containing acrylic resin (A) is over 500. The molecular weight of the mold release agent (C) is 100 or more and 500 or less. The ratio a / b of the weight (a) of the long-chain alkyl-containing acrylic resin contained in the release layer to the weight (b) of the crosslinking agent satisfies formula (I): 0.1 ≤ a / b ≤ 7.

0. A release film in which the ratio c / b of the weight of the crosslinking agent (b) to the weight of the release agent (c) contained in the release layer satisfies formula (II): 0.1 ≤ c / b ≤ 10.

0.

2. The release film according to claim 1, wherein the crosslinking agent (B) is a melamine resin.

3. The release film according to claim 1, wherein the normal release force (PF1) at a peeling speed of 0.3 m / min is 8000 mN / 50 mm or less.

4. The release film according to claim 3, wherein the release force (PF2) after heating (90°C, 20h) at a release speed of 0.3 m / min is 2 times or less the release force (PF1) under normal conditions.

5. The release film according to claim 3, wherein the release force (PF3) after heating (90°C, 20h) at a release speed of 30 m / min is 10 times or less the release force (PF1) under normal conditions.

6. A laminated film comprising an adhesive layer laminated on at least one surface of a release film according to any one of claims 1 to 5 above.

Images