High-hardness molding resin sheet and molded article using same
View Patent ↗According to an embodiment, provided is a molding resin sheet including: a base material layer containing a polycarbonate resin (a1); a high-hardness resin layer containing a high-hardness resin; and a hard coat layer, wherein the high-hardness resin layer is located between the base material layer and the hard coat layer, the high-hardness resin has a pencil hardness of HB or more, and the glass transition points of the polycarbonate resin (a1) and the high-hardness resin satisfy the following relationship: −10° C.≤(the glass transition point of the high-hardness resin)−(the glass transition point of the polycarbonate resin (a1))≤40° C.
1. A molding resin sheet comprising:
a base material layer containing a polycarbonate resin (a1);
a high-hardness resin layer containing a high-hardness resin; and
a hard coat layer,
wherein the high-hardness resin layer is placed between the base material layer and the hard coat layer,
a pencil hardness of the high-hardness resin is HB or harder, and
glass transition points of the polycarbonate resin (a1) and the high-hardness resin satisfy the following relationship:
−10° C.≤(Glass transition point of high-hardness resin)−(Glass transition point of polycarbonate resin ( a 1))≤40° C.,
wherein the content of the polycarbonate resin (a1) contained in the base material layer is 100 mass % of the total mass of the base material layer,
wherein a pencil hardness of a surface of the hard coat layer is 2H to 4H,
wherein the high-hardness resin is selected from the group consisting of resins (B2) and (B4):
resin (B2): a copolymer (D) containing 6-77 mass % (meth)acrylic ester constituent unit, 15-71 mass % styrene constituent unit and 8-23 mass % unsaturated dicarboxylic acid constituent unit, an alloy of said copolymers (D), or an alloy of said copolymer (D) and other high-hardness resin; and
resin (B4): a copolymer (G) containing 5-20 mass % styrene constituent unit, 60-90 mass % (meth)acrylic ester constituent unit and 5-20 mass % N-substituted maleimide constituent unit, or an alloy of said copolymer (G) and said resin (B2).
2. The molding resin sheet according to claim 1 , wherein the polycarbonate resin (a1) is an aromatic polycarbonate resin.
3. The molding resin sheet according to claim 2 , wherein the aromatic polycarbonate resin comprises a constituent unit represented by formula (4a) below:
4. The molding resin sheet according to claim 1 , wherein a content of the high-hardness resin is 70-100 mass % to a total mass of the high-hardness resin layer.
5. The molding resin sheet according to claim 1 , wherein a total thickness of the base material layer and the high-hardness resin layer is 0.5 mm-3.5 mm.
6. The molding resin sheet according to claim 1 , wherein a ratio of the thickness of the base material layer is 75%-99% to a total thickness of the base material layer and the high-hardness resin layer.
7. The molding resin sheet according to claim 1 , wherein the hard coat layer is an acrylic hard coat.
8. A molded resin article molded using the molding resin sheet according to claim 1 .
9. The molded resin sheet according to claim 1 , wherein the high-hardness resin is resin (B2).
10. The molded resin sheet according to claim 1 , wherein the high-hardness resin is resin (B4).