Thermoforming sheets, decorative sheets, and molded articles using the same

Abstract

To provide a thermoforming sheet that achieves both moldability and hardness. [Solution] A thermoforming sheet comprising at least three layers in this order: a layer containing a polycarbonate resin (layer A), a layer containing an acrylic resin (layer B), and a layer formed from the uncured material of an acrylate-based active energy ray curable resin composition (composition C) (layer C), further comprising a protective film that can be peeled off from layer C, wherein layer C is subjected to thermoforming while uncured, wherein the polycarbonate resin has a bisphenol component of 50 mol% or more being bisphenol A and / or bisphenol C, a viscosity-average molecular weight of 20,000 to 32,000, a glass transition temperature (Tg) of 100°C to 145°C, a thickness of layer A in the range of 50 to 3000 μm, and a thickness of layer B in the range of 10 to 300 μm.

Claims

1. A thermoforming sheet comprising at least three layers in this order: a layer containing a polycarbonate resin (layer A), a layer containing an acrylic resin (layer B), and a layer formed from the uncured material of an acrylate-based active energy ray curable resin composition (composition C) (layer C), further comprising a protective film that can be peeled off from layer C, wherein layer C is subjected to thermoforming while uncured, wherein the polycarbonate resin has a bisphenol component of 50 mol% or more being bisphenol A and / or bisphenol C, a viscosity-average molecular weight of 20,000 to 32,000, a glass transition temperature (Tg) of 100°C to 145°C, a thickness of layer A in the range of 50 to 3000 μm, and a thickness of layer B in the range of 10 to 300 μm.

2. The thermoforming sheet according to claim 1, wherein the A layer contains a polyester thermoplastic elastomer, and the polyester thermoplastic elastomer is composed of a hard segment made of polybutylene terephthalate units and a soft segment made of polyester units having aromatic dicarboxylic acids and aliphatic dicarboxylic acids as dicarboxylic acid components and diols having 5 to 15 carbon atoms as diol components.

3. The thermoforming sheet according to claim 2, wherein the aforementioned layer A contains 1 to 20 parts by weight of the polyester thermoplastic elastomer described in claim 2 per 100 parts by weight of polycarbonate resin.

4. The thermoforming sheet according to any one of claims 1 to 3, wherein the B layer is substantially free of rubber particles.

5. The thermoforming sheet according to any one of claims 1 to 4, wherein the C layer contains 1 to 5 parts by weight of a hindered amine compound per 100 parts by weight of uncured acrylate-based active energy ray curable resin composition (composition C).

6. The thermoforming sheet according to any one of claims 1 to 5, wherein the pencil hardness of the surface of the hardened layer obtained by irradiating the C layer with active energy rays and hardening it is H or higher.

7. The thermoforming sheet according to any one of claims 1 to 6, wherein the C layer is a layer formed from the uncured material of a urethane acrylate-based active energy ray curable resin composition (composition C).

8. The thermoforming sheet according to any one of claims 1 to 7, wherein the total thickness of the molding sheet is in the range of 0.05 mm or more and 3 mm or less.

9. A decorative sheet having a decorative layer formed on the side of the A layer of the thermoforming sheet according to any one of claims 1 to 8 that is opposite to the B and C layers.

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