Weather-resistant vinyl chloride resin composition

Abstract

A vinyl chloride resin composition for transparent articles which exhibits excellent weather resistance, heat stability and discoloration resistance, characterized by containing, per 100 parts by mass of a vinyl chloride resin, (A) 0.001 to 10 parts by mass of at least one organic acid zinc salt, (B) 0.001 to 10 parts by mass of at least one zinc-modified hydrotalcite compound, and (C) 0.01 to 20 parts by mass of an oxalanilide-type ultraviolet absorber represented by general formula (I) [wherein R1 is hydrogen, or C1-12 linear or branched alkyl; R2 is C1-12 linear or branched alkyl; and R3 and R4 are each independently hydrogen, or C1-18 linear or branched alkyl].

Description

technical field [0001] The present invention relates to a vinyl chloride-based resin composition suitable for use in transparent products. More specifically, the present invention relates to a vinyl chloride-based resin composition for transparent products that does not use a heavy metal-based stabilizer such as a tin-based stabilizer. thing. Background technique [0002] Vinyl chloride-based resins can be easily adjusted in hardness by adding plasticizers, so they are used in various applications. In particular, rigid vinyl chloride-based resin compositions containing no plasticizer at all or semi-rigid vinyl chloride resin compositions containing a small amount of plasticizer are excellent in rigidity, and thus are widely used in building materials and the like. Such a rigid vinyl chloride resin composition or a semi-rigid vinyl chloride resin composition may be exposed to high temperature and high pressure not only during processing but also as a molded product, so therm...

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Problems solved by technology

However, in any of these documents, there is no record about transparency, so knowledge and insights on improving transparency cannot be obtained from these documents

[0007] In addition, tin-based stabilizers have been proposed as stabilizers for vinyl chloride-based resins capable of improving transparency (Patent Documents 5 and 6), but tin is also not preferable from the viewpoint of environmental impact such as toxicity.

In addition, since most tin-based stabilizers are liquid, vinyl chloride-based resins using such tin-based stabilizers may not only reduce the lubricity of the molten resin during molding, but also lower the heat distortion temperature (softening point) of the molded product. question

[0008] In addition, when vinyl chloride-based resins formulated with calcium-zinc or magnesium-zinc or calcium-magnesium-zinc stabilizers are used in products requiring weather resistance, staining resistance often becomes a problem.

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