JPS646661B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to vinyl chloride resin compositions that are stable against outdoor exposure. If a colored molded product made of vinyl chloride resin is used under direct sunlight, the surface of the exposed part will become white, as if it has been wiped with powder, and the original color tone of the molded product will change drastically, resulting in a change in the appearance of the molded product. It is well known that this can be severely impaired. This phenomenon of whitish coloration occurs when exposed outdoors, but it is a unique phenomenon that cannot be reproduced with a weatherometer, which is commonly used as a weather resistance acceleration tester for synthetic resin molded products, and is called yoking. By the way, rain gutters, decking materials, etc. are used outdoors for long periods of time, so when using vinyl chloride resin molded products for such purposes, various conventional methods have been used to suppress the occurrence of the choke phenomenon and delay its occurrence. Stabilizers, ultraviolet absorbers, photodegradation inhibitors, etc. are added to vinyl chloride resin.
Among them, organotin compounds, cadmium metal soaps,
Lead metal soaps are commonly used because they improve weather resistance and are effective in suppressing tyoke, but even vinyl chloride resins containing these stabilizers have 2
After ~10 months, the yoking phenomenon begins to occur. As described above, even vinyl chloride resins to which stabilizers have been added which have an excellent effect of suppressing yoking cannot be said to be sufficient for long-term outdoor exposure applications. In view of this situation, the present inventors have conducted extensive research and have found that copper salts of (meth)acrylic acid and/or cobalt salts of (meth)acrylic acid have an outstanding choke-suppressing effect, and that the effect can be maintained for a long time. The inventors have found that the present invention lasts, and have completed the present invention. That is, the present invention provides a vinyl chloride resin composition containing a copper salt of (meth)acrylic acid and/or a cobalt salt of (meth)acrylic acid. The vinyl chloride resin used in the present invention refers to vinyl chloride homopolymers and copolymers containing vinyl chloride as a main component, and includes all vinyl chloride resins commonly used for molding. Copper salt of (meth)acrylic acid and/or (meth) used by mixing with vinyl chloride resin in the present invention
The proportion of the cobalt salt of acrylic acid used is usually 0.01 to 10 parts, preferably 0.1 to 2 parts, per 100 parts by weight of the vinyl chloride resin (hereinafter simply referred to as parts). In addition, the vinyl chloride resin composition of the present invention may contain anti-choking agents conventionally used in vinyl chloride resins, such as magnesium oxide, magnesium hydroxide, 2-hydroxy-4-octoxybenzophenone, 2-(2 '-Hydroxy-5-methylphenyl)benzotriazole, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, nickel dibutyldithiocarbamate, etc. can also be used in combination. Furthermore, there is no problem even if well-known additives such as plasticizers, stabilizers, lubricants, colorants, etc. are co-present, and especially when a lead-based stabilizer is co-present, the anti-choke effect is remarkable. The mixing method with the vinyl chloride resin is similar to the conventional mixing method of the anti-choking agent and the vinyl chloride resin, and it is preferable to use it in fine powder form and thoroughly knead it. There is a method of adding and mixing, and a method of pre-containing other well-known additives such as plasticizers, stabilizers, lubricants, colorants, etc., and adding them to vinyl chloride resin and mixing. The latter method is preferred in that it is easier to disperse uniformly. The composition of the present invention obtained in this way is stable against outdoor exposure, so it can be used in equipment used outdoors,
Even when used in tools, the occurrence of yoking is suppressed for a long period of time, making it ideal for uses such as rain gutters and decking materials. Next, the present invention will be explained by examples. Example 1 Vinyl chloride resin [Sumirit SX manufactured by Sumitomo Chemical Co., Ltd.
-11F] Add and mix 100 parts of tribasic lead sulfate 0.8 parts dibasic lead stearate 0.4 parts Lead stearate 1.3 parts Calcium stearate 0.4 parts Polyethylene wax 0.3 parts to 103.2 parts of a compound prepared by mixing Bengara [Toda] 0.7 parts of 100R produced by Kogyo Co., Ltd. and 1.0 parts of copper acrylate were added and mixed, kneaded for 5 minutes with two 6-inch rolls heated at 155°C, and made into a 1 mm thick sheet using a heated press at 180°C. This sheet was subjected to an outdoor exposure test to examine the occurrence of the yoking phenomenon. Examples 2 to 3 and Comparative Example 1 Sheets were prepared in the same manner as in Example 1, except that the compounds shown in Table 1 were used in the amounts shown in Table 1 instead of 1.0 part of copper acrylate, and the sheets were subjected to an outdoor exposure test. provided. After 12 months and 18 months of exposure in each of the above cases,
Table 1 shows the color difference on the sample surface after 24 months. 【table】

Claims (1)

[Claims] 1. A vinyl chloride resin composition containing a copper salt of (meth)acrylic acid and/or a cobalt salt of (meth)acrylic acid.