EP-4741456-A1 - VINYL CHLORIDE RESIN COMPOSITION, METHOD FOR PRODUCING VINYL CHLORIDE RESIN COMPOSITION, VINYL CHLORIDE RESIN MOLDED ARTICLE, AND LAYERED BODY

Abstract

Provided are a vinyl chloride resin composition that can inhibit reduction of powder fluidity even when containing a finely ground product of surface skin material made of vinyl chloride resin and a method of producing this vinyl chloride resin composition. The vinyl chloride resin composition contains (a) vinyl chloride resin particles, (b) vinyl chloride resin fine particles A, (c) a plasticizer, and (d) a powder composition containing a powder of surface skin material made of vinyl chloride resin.

Inventors

• NISHIMURA SHOTA

Assignees

• Zeon Corporation

Dates

Publication Date

20260513

Application Date

20240628

Claims (18)

1. A vinyl chloride resin composition comprising: (a) vinyl chloride resin particles; (b) vinyl chloride resin fine particles A; (c) a plasticizer; and (d) a powder composition containing a powder of surface skin material made of vinyl chloride resin.
2. The vinyl chloride resin composition according to claim 1, wherein an amount of the powder of surface skin material made of vinyl chloride resin is not less than 1 part by mass and not more than 40 parts by mass per 100 parts by mass of the vinyl chloride resin composition.
3. The vinyl chloride resin composition according to claim 1, wherein the powder of surface skin material made of vinyl chloride resin has a volume-average particle diameter of not less than 50 µm and not more than 500 µm.
4. The vinyl chloride resin composition according to claim 1, wherein the powder composition further contains (b-1) vinyl chloride resin fine particles B.
5. The vinyl chloride resin composition according to claim 1, wherein an amount of all vinyl chloride resin fine particles is not less than 3 parts by mass and not more than 40 parts by mass per 100 parts by mass of the powder of surface skin material made of vinyl chloride resin.
6. The vinyl chloride resin composition according to claim 1, wherein an amount of all vinyl chloride resin fine particles is not less than 15 parts by mass and not more than 35 parts by mass per 100 parts by mass, in total, of the (a) vinyl chloride resin particles and the powder of surface skin material made of vinyl chloride resin.
7. The vinyl chloride resin composition according to claim 4, wherein proportional content of the (b-1) vinyl chloride resin fine particles B in the powder composition is not less than 2.0 mass% and not more than 25 mass%.
8. The vinyl chloride resin composition according to claim 4, wherein the powder composition has a drop time of 35 seconds or less.
9. The vinyl chloride resin composition according to claim 1, wherein the powder composition is contained in a proportion of not less than 3 parts by mass and not more than 30 parts by mass per 100 parts by mass of the (a) vinyl chloride resin particles.
10. The vinyl chloride resin composition according to claim 1, wherein the (c) plasticizer includes either or both of a trimellitic acid ester and a polyester.
11. The vinyl chloride resin composition according to claim 1, used in powder molding.
12. The vinyl chloride resin composition according to claim 1, used in powder slush molding.
13. A method of producing a vinyl chloride resin composition comprising: preparing a raw material vinyl chloride resin composition containing (a) vinyl chloride resin particles, (b) vinyl chloride resin fine particles A, and (c) a plasticizer; preparing a powder composition containing a powder of surface skin material made of vinyl chloride resin; and adding and mixing the powder composition into the raw material vinyl chloride resin composition.
14. The method of producing a vinyl chloride resin composition according to claim 13, wherein the preparing a powder composition containing a powder of surface skin material made of vinyl chloride resin includes adding and mixing (b-1) vinyl chloride resin fine particles B into the powder of surface skin material made of vinyl chloride resin.
15. A vinyl chloride resin molded product obtained through molding of the vinyl chloride resin composition according to any one of claims 1 to 12.
16. The vinyl chloride resin molded product according to claim 15, for an automobile instrument panel surface skin.
17. A laminate comprising: a foamed polyurethane molded product; and the vinyl chloride resin molded product according to claim 15.
18. The laminate according to claim 17, for an automobile instrument panel.

Description

TECHNICAL FIELD The present disclosure relates to a vinyl chloride resin composition, a method of producing a vinyl chloride resin composition, a vinyl chloride resin molded product, and a laminate. BACKGROUND Vinyl chloride resins are used in a variety of applications due to generally having excellent characteristics in terms of cold resistance, heat resistance, oil resistance, and so forth. Specifically, automobile interior materials such as a surface skin formed of a vinyl chloride resin molded product and a laminate obtained by lining a surface skin formed of a vinyl chloride resin molded product with a foamed product such as foamed polyurethane are used in the formation of automobile interior components such as automobile instrument panels and door trims. A vinyl chloride resin molded product that constitutes a surface skin of an automobile interior component such as an automobile instrument panel (hereinafter, such a vinyl chloride resin molded product is also referred to as "surface skin material made of vinyl chloride resin") is produced by, for example, molding a vinyl chloride resin composition containing a vinyl chloride resin, a plasticizer, and additives such as a pigment by a known molding method such as powder slush molding. In recent years, it has become desirable to recycle waste of surface skin material made of vinyl chloride resin from viewpoints such as effective use of resources and environmental preservation, and various methods of recycling surface skin material made of vinyl chloride resin have been studied. As one example, Patent Literature (PTL) 1 discloses a method of recycling surface skin material made of vinyl chloride-based resin in which a powder obtained through grinding of used surface skin material made of vinyl chloride-based resin is used as a raw material of a second layer in a method of producing a two-layered molded article by double slush molding in which powder slush molding constituting a first step and powder slush molding constituting a second step are performed consecutively. CITATION LIST Patent Literature PTL 1: JP-H07-052175A SUMMARY (Technical Problem) Surface skin material made of vinyl chloride resin that is to be used in an automobile interior component or the like is typically adjusted to the shape of the automobile interior component through cutting or the like, thereby resulting in the formation of cutting remnants such as burrs and edges. In recent years, there has been demand for not only reusing waste of used surface skin material made of vinyl chloride resin, but also for reusing cutting remnants arising during processing of surface skin material made of vinyl chloride resin from viewpoints such as even more effective use of resources and environmental preservation. In view thereof, the inventors studied the reuse of waste such as used surface skin material made of vinyl chloride resin and cutting remnants of surface skin material made of vinyl chloride resin by grinding the waste to obtain a finely ground product and then mixing the finely ground product into a raw material vinyl chloride resin composition (hereinafter, also referred to as "virgin material") containing vinyl chloride resin particles, a plasticizer, and so forth. However, the mixing of a finely ground product of waste of surface skin material made of vinyl chloride resin into virgin material resulted in a problem that the resultant vinyl chloride resin composition had poorer powder fluidity and could not be molded well. Accordingly, one object of the present disclosure is to provide a vinyl chloride resin composition that can inhibit reduction of powder fluidity even when containing a finely ground product of surface skin material made of vinyl chloride resin and a method of producing this vinyl chloride resin composition. Another object of the present disclosure is to provide a vinyl chloride resin molded product obtained through molding of this vinyl chloride resin composition. Yet another object of the present disclosure is to provide a laminate including this vinyl chloride resin molded product. (Solution to Problem) The inventor conducted diligent investigation with the aim of solving the problem set forth above. The inventor made a new discovery that when producing a vinyl chloride resin composition through mixing of a vinyl chloride resin and a plasticizer with a finely ground product of surface skin material made of vinyl chloride resin, powder fluidity of the obtained vinyl chloride resin composition can be improved by adding vinyl chloride resin fine particles as a dusting agent (powder fluidity modifier), and, in this manner, the inventor completed the present disclosure. Specifically, with the aim of advantageously solving the problem set forth above, [1] a presently disclosed vinyl chloride resin composition comprises: (a) vinyl chloride resin particles; (b) vinyl chloride resin fine particles A; (c) a plasticizer; and (d) a powder composition containing a powder of su