Release film and method for manufacturing the same

Abstract

[Problem] To provide: a slurry that is for a sheet and that is superior even when a sheet with a reduced thickness is obtained; and a release film having wettability with respect to a resin solution and having suitable sheet peel force. [Solution] A release film having a release layer at least on one surface of a polyester film, wherein the release layer is obtained by curing a release layer-forming composition, the release layer-forming composition contains an acrylic resin having a hydroxyl value of 150-450 mgKOH / g, the acrylic resin is obtained through copolymerization of at least two acrylic monomer components selected from the group consisting of acrylic monomers having a hydroxyl group to be used as a first acrylic monomer, acrylic monomers having a carboxyl group to be used as a second acrylic monomer, acrylic monomers having a long-chain alkyl group to be used as a third acrylic monomer, and radical-polymerizable acrylic monomers other than said acrylic monomers, to be used as a fourth acrylic monomer.

Claims

[Claim 1] A release film having a release layer directly on at least one side of a polyester film or via another layer, The aforementioned release layer is a layer formed by curing a release layer-forming composition. The aforementioned release layer forming composition contains an acrylic resin, The hydroxyl value of the aforementioned acrylic resin is 150 mg KOH / g or more and 450 mg KOH / g or less. The aforementioned acrylic resin is As the first acrylic monomer, an acrylic monomer having a hydroxyl group, As the second acrylic monomer, an acrylic monomer having a carboxyl group, As a third acrylic monomer, an acrylic monomer having a long-chain alkyl group, and The fourth acrylic monomer is a resin obtained by copolymerizing a radically polymerizable acrylic monomer other than the first to third acrylic monomers. (Composition ratio of the first acrylic monomer) / (Composition ratio of the second acrylic monomer) It is between 6.0 and 11.

5. The composition ratio of the third acrylic monomer to the total amount of copolymer components in the acrylic resin is 40 mol% or less. The fourth acrylic monomer is contained in the acrylic resin in an amount of 2 mol% to 35 mol% based on the total amount of copolymer components in the acrylic resin, The aforementioned release layer forming composition contains an oxazoline-based crosslinking agent as a crosslinking agent. Release film. [Claim 2] The release film according to Claim 1, wherein the hydroxyl value of the acrylic resin is 190 mg KOH / g or more and 450 mg KOH / g or less. [Claim 3] The surface free energy of the release layer on the side opposite to the polyester film is 30 mJ / m ２ The release film according to claim 1. [Claim 4] The release film according to claim 1, wherein the acid value of the acrylic resin is 20 mg KOH / g or more and 300 mg KOH / g or less. [Claim 5] The release film according to claim 1, wherein the glass transition temperature (Tg) of the acrylic resin is 40°C or higher and 110°C or lower. [Claim 6] The composition ratio of the first acrylic monomer in the acrylic resin is 25 mol% or more and 95 mol% or less, relative to the total amount of the copolymer component in the acrylic resin, The composition ratio of the second acrylic monomer in the acrylic resin is 0.1 mol% or more and 35 mol% or less, relative to the total amount of the copolymer component in the acrylic resin, which is 100 mol%. The release film according to claim 1. [Claim 7] The release film according to claim 1, wherein the oxazoline crosslinking agent contains 3.0 to 9.0 mmol / g of oxazoline groups. [Claim 8] The release film according to claim 1, wherein the release film is a release film for manufacturing ceramic green sheets.

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