Thermoplastic resin film, its manufacturing method, and laminated body

1. A thermoplastic resin film composed of a thermoplastic resin composition (C) comprising:

a thermoplastic resin (R); and

fine particles (P) having a volume average particle diameter of from 0.5 to 15 μm and a refractive index different from a refractive index of the thermoplastic resin (R) by 0.02 or more,

wherein:

the fine particles (P) are inorganic particles; and

at least one of thermoplastic resin film surfaces satisfies formulas (1) and (2):

G L ≥60  (1), and

G L −35≤ G H ≤G L −10  (2)

wherein G L is 60° gloss (%) at 20° C., and G H is 60° gloss (%) when the thermoplastic resin film is heated at a temperature 10° C. higher than a glass transition temperature of the thermoplastic resin composition (C) for 30 minutes, then cooled to 20° C.

2. The thermoplastic resin film according to claim 1 , wherein the thermoplastic resin film further satisfies formula (3-1):

10/ d≤W≤ 30/ d   (3-1)

wherein d is a volume average particle diameter (μm) of the fine particles (P), and W is a content (mass %) of the fine particles (P) in the thermoplastic resin film.

3. The thermoplastic resin film according to claim 1 , wherein an external haze of the thermoplastic resin film is lower than an internal haze of the thermoplastic resin film.

4. The thermoplastic resin film according to claim 1 , wherein the thermoplastic resin (R) comprises:

acrylic-based multilayer structure polymer particles (A),

wherein:

at least one inner layer of the thermoplastic resin is a crosslinked elastic polymer layer with a main component monomer unit being an alkyl acrylate ester monomer unit having an alkyl group carbon number of 1 to 8 and/or a conjugated diene-based monomer unit; and

an outermost layer of the thermoplastic resin is a thermoplastic polymer layer with a main component monomer unit being an alkyl methacrylate ester monomer unit having an alkyl group carbon number of from 1 to 8.

5. The thermoplastic resin film according to claim 4 , wherein the acrylic-based multilayer structure polymer particles (A) comprise:

three-layer structure polymer particles (AX) that comprise, from its center, first to third layers, wherein:

the first layer consists of a crosslinked polymer layer comprising from 30 to 98.99 mass % of methyl methacrylate units, from 1 to 70 mass % of alkyl acrylate ester units having an alkyl group carbon number of from 1 to 8, and from 0.01 to 2 mass % of polyfunctional monomer units;

the second layer consists of a cross linked elastic polymer layer comprising from 70 to 99.9 mass % of alkyl acrylate ester units having an alkyl group carbon number of from 1 to 8, from 0 to 30 mass % of methyl methacrylate units, and from 0.1 to 5 mass % of polyfunctional monomer units; and

the third layer consists of a hard thermoplastic polymer layer comprising from 80 to 99 mass % of methyl methacrylate units and from 1 to 20 mass % of alkyl acrylate ester units having an alkyl group carbon number of from 1 to 8.

6. The thermoplastic resin film according to claim 4 , wherein the acrylic-based multilayer structure polymer particles (A) have a particle diameter of from 0.05 to 0.20 μm.

7. The thermoplastic resin film according to claim 4 , wherein the thermoplastic resin (R) further comprises a methacrylic-based resin (B) having 80 mass % or more of methyl methacrylate units and having an intrinsic viscosity of from 0.3 to 1.0 dl/g.

8. A printed resin film, comprising:

the thermoplastic resin film according to claim 4 ; and

a printed film surface.

9. A matte resin film obtained by heating the thermoplastic resin film according to claim 4 .

10. A decorating film, comprising:

the thermoplastic resin film according to claim 4 .

11. A film for building materials, comprising:

the thermoplastic resin film according to claim 4 .

12. A laminated film, comprising:

the thermoplastic resin film according to claim 4 .

13. A laminated body, comprising:

the thermoplastic resin film according to claim 4 laminated on a substrate.

14. A method of manufacturing the thermoplastic resin film according to claim 4 , the method comprising:

melting and extruding the thermoplastic resin composition (C) from a T-die into a film shape; and

sandwiching a melted product extruded into the film shape between a pair of cooling rollers, which are both metallic rigid rollers or one is a metallic rigid roller and the other is a metallic elastic roller.

15. The method according to claim 14 , which satisfies formula (4):

10≤| TgC−T 2|≤40  (4), and

wherein T1 is a surface temperature of one of the cooling rollers,

T2 is a surface temperature of the other one of the cooling rollers (where T2≥T1), and

TgC is a glass transition temperature of the thermoplastic resin composition (C).

16. A method of manufacturing a matte resin film, the method comprising:

applying a heat treatment to the thermoplastic resin film according to claim 4 .

17. A method of manufacturing a matte resin film, the method comprising:

printing at least one film surface of the thermoplastic resin film according to claim 4 ; and

applying a heat treatment to the thermoplastic resin film.