Vinyl chloride resin composition and vinyl chloride resin molded article

1. A vinyl chloride resin composition comprising:

a vinyl chloride resin (A),

a stabilizer (B) containing both calcium and zinc, and

a processing auxiliary (C),

wherein the processing auxiliary (C) is a copolymer containing 19 mass % to 94 mass % of a methyl methacrylate monomer (c1) unit, 5 mass % to 80 mass % of an alkyl methacrylate monomer (c2) unit having a C 3 -C 5 alkyl group, and 1 mass % to 20 mass % of an acrylate monomer unit as other monomer (c3) units, while containing no i-butyl methacrylate monomer unit,

wherein the alkyl methacrylate monomer (c2) unit having a C 3 -C 5 alkyl group is a n-butyl methacrylate monomer unit, and

wherein the vinyl chloride resin composition does not contain a foaming agent.

2. The vinyl chloride resin composition of claim 1 , wherein the processing auxiliary (C) is a copolymer containing 5 mass % to 60 mass % of the alkyl methacrylate monomer (c2) unit having a C 3 -C 5 alkyl group.

3. The vinyl chloride resin composition of claim 2 , wherein the processing auxiliary (C) is a copolymer containing 18 mass % to 50 mass % of the alkyl methacrylate monomer (c2) unit having a C 3 -C 5 alkyl group.

4. The vinyl chloride resin composition of claim 1 , wherein the processing auxiliary (C) is a copolymer containing 1 mass % to 10 mass % of the other monomer (c3) units.

5. The vinyl chloride resin composition of claim 4 , wherein the processing auxiliary (C) is a copolymer containing 1 mass % to 5 mass % of the other monomer (c3) units.

6. The vinyl chloride resin composition of claim 1 , wherein the vinyl chloride resin composition further contains an impact strength modifier (D).

7. The vinyl chloride resin composition of claim 6 , wherein the impact strength modifier (D) contains at least one of acrylic rubber and silicone rubber.

8. The vinyl chloride resin composition of claim 6 , wherein based on 100 parts by mass of the vinyl chloride resin (A), a content of the stabilizer (B) is 0.1 parts by mass to 10.0 parts by mass, a content of the processing auxiliary (C) is 0.1 parts by mass to 10.0 parts by mass, and a content of the impact strength modifier (D) is 0.5 parts by mass to 30.0 parts by mass.

9. The vinyl chloride resin composition of claim 8 , wherein based on 100 parts by mass of the vinyl chloride resin (A), a content of the impact strength modifier (D) is 4.0 parts by mass to 10.0 parts by mass.

10. The vinyl chloride resin composition of claim 1 , wherein based on 100 parts by mass of the vinyl chloride resin (A), a content of the stabilizer (B) is 0.1 parts by mass to 10.0 parts by mass and a content of the processing auxiliary (C) is 0.1 parts by mass to 10.0 parts by mass.

11. The vinyl chloride resin composition of claim 1 , wherein the stabilizer (B) comprises a mixture of: (i) one or more of a calcium salt of a long chain fatty acid; and (ii) one or more of a zinc salt of a fatty acid, wherein the fatty acid is selected from the group consisting of butyric acid, pentanoic acid, hexanoic acid, heptanoic acid, caprylic acid, nonanoic acid, decanoic acid, lauric acid, myristic acid, pentadecanoic acid, palmitic acid, isostearic acid, stearic acid, oleic acid, linoleic acid, ricinoleic acid, octylic acid, arachidic acid, arachidonic acid, behenic acid, lignoceric acid, and montanic acid.

12. The vinyl chloride resin composition of claim 1 , wherein the processing auxiliary (C) has a reduced viscosity nsp of 0.1 to 1.5 ml/g, wherein the reduced viscosity nsp is a value measured at 25° C. by dissolving 0.1 g of a polymer or a copolymer in 100 mL of chloroform.

13. The vinyl chloride resin composition of claim 12 , wherein the processing auxiliary (C) has a reduced viscosity nsp of 0.2 to 1.0 ml/g.

14. A vinyl chloride resin molded article obtained by molding the vinyl chloride resin composition of claim 1 .