JPS6220544A - Resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin composition for agricultural film with outstanding anti-stick and anti-fogging capabilities, by incorporating a chlorine-contg. resin with anti-stick agent and an ester from dipentaerythritol and branched chain fatty acid. CONSTITUTION:The objective resin composition can be obtained by incorporating (A) 100pts.wt. of either polyvinyl chloride or a resin consisting mainly of vinyl chloride with (B) 1-3pts. by an anti-stick agent, pref. sorbitan monostearate, sorbitan monopalmitate, etc. and (C) 0.1-2pts.wt. of an ester prepared by reaction between (i) dipentaerythritol with a particle size pref. <=74mum and (ii) a fatty acid carrying branched chain fatty acid group (pref. of 8-18C) (e.g., isostearic acid, isopalmitic acid) so as to be 1/1-1/3 in the molar ratio: (i)/(ii), and furthermore, if needed, (D) such ingredients as plasticizer, stabilizer, or ultraviolet light absorber.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chlorine-containing resin composition for agricultural film, which has excellent droplet properties and fog prevention properties. Chlorine-containing resins, such as vinyl chloride resins, have excellent heat retention, weather resistance, and economic efficiency, and are therefore widely used as agricultural films for greenhouse cultivation, tunnel cultivation, etc.

However, if ordinary chlorine-containing resin film is used as is for agricultural greenhouses, water droplets will adhere to the film surface, reducing the penetration of sunlight, which is unfavorable for growing crops. A droplet agent is incorporated into the film, and it has come to be used commercially as a droplet film or drip-proof film.

However, in greenhouses and tunnels that use agricultural chlorine-containing resin films that contain such droplet agents, the droplet properties are lower than those that use agricultural chlorine-containing resin films that do not contain droplet agents. It has become clear that while it has the advantage of extremely reducing the adhesion of water droplets, it also has the disadvantage of causing significant fog (sometimes called mist) when the temperature changes widely, such as in the morning and evening. Ta.

This fog phenomenon often occurs during the winter, which is the most important period for greenhouse cultivation and tunnel cultivation, and it not only reduces work efficiency, but although the cause and effect relationship is not clear, it can prevent the occurrence of diseases, and reduce the number of fallen buds and fruits. It is said that this can be a cause of ring growth, and is highly frowned upon by horticulturists. Until now, various methods have been proposed to suppress or prevent the occurrence of fog, but none of them have been sufficiently effective, and an effective method has been eagerly awaited.

The present inventors discovered in JP-A No. 60-72949 that a fatty acid ester of dipentaerythritol is effective in preventing fog, but this time, by using a branched fatty acid as one fat 8j group, The present invention was completed based on the discovery that n prevention performance was improved.

That is, the present invention uses one or more droplet agents.

The present invention provides a chlorine-containing resin composition for agricultural film, which is characterized in that it also contains one or more of dipentaerythritol and esters of branched chain fatty acids.

The chlorine-containing resin of the present invention is a vinyl chloride homopolymer or a resin mainly composed of vinyl chloride, such as vinyl chloride, vinyl acetate, nylidene chloride, ethylene, propylene, methacrylic acid ester, and urethane resin. copolymers and graft polymers, blends with these resins, etc.

Next, the droplet agent used in the present invention may be any agent as long as it has the effect of preventing water droplets, but suitable examples include sorbitan monostearate, sorbitan monopalmitate,
Sorbitan monolaurate, sorbitan sesquistearate, sorbitan dipalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan distearate, polyoxypropylene sorbitan sesquistearate, sorbitol monostearate, glycerin monostearate, silicone surfactants, fluorine-based surfactants, and the like.

These may be used alone or in combination of two or more, and in order to impart good droplet properties, they are usually used in an amount of 10 to 3.0 parts by weight per 100 parts by weight of the chlorine-containing resin.

Next, examples of the ester of dipentaerythritol and branched fatty acid used in the present invention include compounds obtained by reacting the compositions shown in Table 1, for example.

These may be used alone or in combination of two or more, and are preferably used in an amount of 0.1 to 2 parts by weight per 100 parts by weight of the chlorine-containing resin.

Moreover, in addition to those used in Table 1, the branched chain fatty acids used in the present invention include 2-methylpentaf-canoic acid,
Examples include 2-ethylutetradecanoic acid, 15-methylheptadecanoic acid, isodecanoic acid, neodecanoic acid, 2ethylhexylic acid, and the like.

Table 1 In addition, in the present invention, in order to basically satisfy the essential performance as an agricultural film, various zelkova plasticizers, various stabilizers, metal soaps, lubricants, organic phosphite esters, organic phosphate esters, acid phosphoric acid Ester or its gold a salt, pigment, 70
It goes without saying that anti-sticking agents, ultraviolet absorbers, antioxidants, anti-coloring agents, light resistance improvers such as hindered amines, epoxy compounds, and the like may be used.

This will be explained in detail below using examples.

Example 1 The formulation shown in Table 2 was calendered into a film with a thickness of O, lsI+, and a house with a length of 5 m, a width of 60 cm, and a height of 50 cm was erected on a farmland.

The inside of the greenhouse was visually observed in the morning and evening to evaluate the amount of fog, and the droplet flow on the inner surface of the film was also evaluated. The house was expanded in February 1960.

Example 2 The formulation in Table 3 was calendered into a film with a thickness of O.
The house was set up.

The inside of the greenhouse was visually observed in the morning and evening to evaluate the amount of fog, and the droplet flow on the inner surface of the film was also evaluated. The house was expanded in February 1960.

The evaluations in Tables 2 and 3 are as follows.

Frost growth status ◎: 5'F of a, no growth observed ○: Little fog formation △: Quite a bit of fog formation : 〃 is small Δ : 〃 is quite large ×: I! is remarkable

Claims (1)

[Scope of Claims] 1. A chlorine-containing resin composition for agricultural film, characterized in that the chlorine-containing resin contains one or more droplet agents and one or more esters of dipentaerythritol and branched fatty acids. . 2. The branched fatty acid group of the ester of dipentaerythritol and branched fatty acid is a C8 to C18 branched fatty acid group, and the reaction molar ratio of dipentaerythritol and branched fatty acid is 1:1 to 1:3. The chlorine-containing resin composition for agricultural film according to claim 1. 3. The chlorine-containing resin composition for agricultural film according to claim 1, wherein the dipentaerythritol, which is an ester of dipentaerythritol and a branched chain fatty acid, is dipentaerythritol having a particle size of 74 μm or less.