KR-102962786-B1 - Laminated sheets and electronic component packaging containers and electronic component packaging

Abstract

(Project) To provide a laminated sheet having an excellent balance of physical properties such as bendability, antistatic properties, and moldability, and also being resistant to burr formation, as well as an electronic packaging container and an electronic component packaging body using the same. (Solution) A laminated sheet having a substrate layer and surface layers formed on both sides of the substrate layer, wherein the surface layer comprises 50 to 90 mass% of the following component (A) and 10 to 50 mass% of the following component (B) based on the total mass of the surface layer, and the substrate layer is composed of a vinyl aromatic hydrocarbon resin composition comprising monomer units derived from a conjugated diene, and the ratio of monomer units derived from the conjugated diene in the substrate layer is 6 to 14 mass% based on the total monomer units of the vinyl aromatic hydrocarbon resin composition. (A) Components: Rubber-modified (meth)acrylic acid ester-vinyl aromatic hydrocarbon copolymer having a proportion of conjugated diene rubber components of 5 to 25 mass%. (B) Component: Polymer antistatic agent.

Inventors

• 야나카 료스케
• 후지와라 준페이

Assignees

• 덴카 주식회사

Dates

Publication Date

20260508

Application Date

20200416

Priority Date

20190426

Claims (12)

1. A laminated sheet having a substrate layer and surface layers formed on both sides of the substrate layer, The above surface layer comprises, with respect to the total mass of the above surface layer, 50 to 90 mass% of the following component (A) and 10 to 50 mass% of the following component (B), The above substrate layer is composed of a vinyl aromatic hydrocarbon resin composition containing monomer units derived from conjugated diene, and The proportion of monomer units derived from the conjugated diene in the above substrate layer is 6 to 14 mass% with respect to the total monomer units of the vinyl aromatic hydrocarbon resin composition, and A laminated sheet comprising, based on the total mass of the vinyl aromatic hydrocarbon resin composition, 30 to 70 mass% of the following component (C), 30 to 70 mass% of the following component (D), and 0 to 40 mass% of recycled material of the laminated sheet. (A) Components: Rubber-modified (meth)acrylic acid ester-vinyl aromatic hydrocarbon copolymer having a proportion of conjugated diene rubber components of 5 to 25 mass%. (B) Component: Polymer antistatic agent. (C) Component: Vinyl aromatic hydrocarbon-conjugated diene block copolymer. (D) Component: At least one polymer selected from the group consisting of vinyl aromatic hydrocarbon polymers and rubber-modified vinyl aromatic hydrocarbon polymers.
2. In Article 1, A laminated sheet in which the above-mentioned polymeric antistatic agent is a block copolymer having at least one block selected from the group consisting of polyolefin-based blocks and polyamide-based blocks, and a hydrophilic block in the molecular chain.
3. In Article 1 or Article 2, A laminated sheet in which the thickness ratio of each layer of the laminated sheet, represented as a surface layer/substrate layer, is 10/90 to 50/50.
4. In Article 1 or Article 2, A laminated sheet having an image clarity of 40% or more as measured by a measurement method compliant with JIS-K-7374.
5. In Article 1 or Article 2, A laminated sheet having a tensile elastic modulus of 1200 to 2000 MPa as measured by a measurement method compliant with JIS-K-7127.
6. In Article 1 or Article 2, A laminated sheet having a break strength of 30 times or more, measured by a measurement method compliant with JIS-P-8115.
7. In Article 1 or Article 2, Laminated sheet with a stamping burr rate of less than 10%.
8. An electronic component packaging container using a laminated sheet as described in claim 1 or 2.
9. In Article 8, Carrier tape, electronic component packaging container.
10. In Article 9, Tray, electronic component packaging container.
11. An electronic component package using the electronic component packaging container described in Clause 8.
12. delete

Description

Laminated sheets and electronic component packaging containers and electronic component packaging The present invention relates to a laminated sheet, an electronic component packaging container, and an electronic component packaging body. Carrier tapes used for mounting electronic components such as ICs and LSIs on electronic devices are made by thermoforming a sheet composed of thermoplastic resins, such as vinyl chloride resin, vinyl aromatic hydrocarbon resin, polycarbonate resin, and polyethylene terephthalate resin, into an embossed shape. For the purpose of preventing electrostatic interference with electronic components housed in the embossed portion (also called a pocket), these carrier tapes are made opaque sheets that are made conductive by, for example, incorporating a conductive filler such as carbon black into the thermoplastic resin. Meanwhile, among electronic components, carrier tapes that house components that are less likely to be destroyed by electrostatic interference, such as capacitors, are made of a transparent type of carrier tape based on a thermoplastic resin with relatively good transparency among the resins, as this is advantageous for visually inspecting the electronic components from the outside or detecting characters written on the electronic components. As sheets for transparent type carrier tapes, for example, a sheet mixed with a vinyl aromatic hydrocarbon polymer and a vinyl aromatic hydrocarbon-conjugated diene block copolymer (see Patent Documents 1 and 2), or a sheet using a rubber-modified (meth)acrylic acid ester-vinyl aromatic hydrocarbon copolymer (Patent Document 3) have been proposed. However, in addition to the aforementioned transparency, carrier tapes are required to have a balanced combination of various physical properties, such as bendability (break strength), antistatic properties, and moldability. However, conventional laminated sheets for carrier tapes have a problem in that it is difficult to sufficiently satisfy these various physical properties. In addition, burrs may occur on the cross-section of carrier tapes when slitting the fabric sheet or punching sprocket holes through embossing. For this reason, there is a demand for laminated sheets for carrier tapes that are resistant to burr formation. FIG. 1 is a cross-sectional view showing one embodiment of the laminated sheet of the present invention. The present invention will be described in detail below, but the present invention is not limited to the following embodiments. [Laminated Sheet] The present invention relates to a laminated sheet having a substrate layer and surface layers formed on both sides of the substrate layer, wherein the surface layer comprises 50 to 90 mass% of the following component (A) and 10 to 50 mass% of the following component (B) based on the total mass of the surface layer, and the substrate layer is composed of a vinyl aromatic hydrocarbon resin composition comprising monomer units derived from conjugated diene, and the ratio of monomer units derived from conjugated diene in the substrate layer is 6 to 14 mass% based on the total monomer units of the vinyl aromatic hydrocarbon resin composition. (A) Components: Rubber-modified (meth)acrylic acid ester-vinyl aromatic hydrocarbon copolymer having a proportion of conjugated diene rubber components of 5 to 25 mass%. (B) Component: Polymer antistatic agent. The laminated sheet of the present invention, by having the above configuration, has an excellent balance of physical properties such as bendability (bending strength), antistatic properties, and moldability, and can also effectively suppress the occurrence of burrs. FIG. 1 is a cross-sectional view showing one embodiment of the laminated sheet of the present invention. The laminated sheet (10) has surface layers (2) formed on both sides of a substrate layer (1). Hereinafter, the composition of the laminated sheet of the present invention will be described in detail. <Surface layer> The laminated sheet of the present invention comprises surface layers formed on both sides of a substrate layer. In addition, the surface layer comprises the aforementioned components (A) and (B). That is, the surface layer is composed of a resin composition comprising components (A) and (B). ((A) component) (A) is a rubber-modified (meth)acrylic acid ester-vinyl aromatic hydrocarbon copolymer having a ratio of conjugated diene rubber component of 5 to 25 mass%. Here, “ratio of conjugated diene rubber component” means the content of the conjugated diene rubber component relative to the total mass of component (A). (A) The component is obtained by copolymerizing a (meth)acrylic acid ester monomer and a vinyl aromatic hydrocarbon monomer in the presence of a rubber component. In addition, the rubber component, which is graft-polymerized from a (meth)acrylic acid ester monomer and a vinyl aromatic hydrocarbon monomer, has a structure in which the rubber component is dispersed in an island shape w