JPS6169851A - Vinyl chloride resin composition for food packaging film - Google Patents

Abstract

PURPOSE:To provide the titled compsn. which has excellent resistance to oils and cold and little causes migration and bleeding of a plasticizer, consisting of a vinyl chloride resin, an acrylonitrile/butadiene copolymer and a plasticizer. CONSTITUTION:0.5-20pts.wt. acrylonitrile/butadiene copolymer having an acrylonitrile content of 20-50wt% and 20-60pts.wt. plasticizer selected from among diisononyl adipate, di-n-alkyl adipates derived from a 6-10C aliph. alcohol, tributyl acetylcitrate, epoxidized soybean oil and epoxidized linseed oil are blended with 100pts.wt. vinyl chloride resin having a degree of polymn. of 800-3,000, such as PVC.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides vinyl chloride and fat compositions, particularly (2) the transfer of plasticizers, etc., in which the extraction amount of plasticizers, etc. by n-hebutane is reduced; The present invention relates to a vinyl chloride resin composition suitable for use in food packaging films, which has little elution and improved oil resistance and cold resistance.

(Prior art) Soft vinyl chloride film is widely used for food packaging, commercial stretch film, commercial use, and household use. Because they may elute, the amount of plasticizers extracted using n-hebutane should be reduced to 15% according to the Ministry of Health and Welfare notification C2.
It is specified that T is 0 ppm or less.

Therefore, the amount of plasticizer extracted by n-heradane g2 from general commercially available vinyl chloride film for food packaging is naturally 150p.
pmJa and has a thickness of 10 to 20 mm and is made from a vinyl chloride resin composition containing diisononyl adipate (hereinafter abbreviated as DINAI) as a plasticizer, for example.
The value of μm food packaging film is set to be 139 ppm or less, and even if the thickness increases, it will be 150 ppm J2L or less (:), but it is desired that this value be lowered.

Therefore, the use of polyester plasticizers, which are non-migratory plasticizers, in combination with conventionally known plasticizers is being considered in vinyl chloride resin compositions for making food packaging films. Since sufficient effects cannot be obtained from polyester plasticizers unless they are used in a large amount, an alternative method is desired.

(Structure of the Invention) The present invention relates to a vinyl chloride-based resin composite acid for food packaging films that solves these disadvantages and has a reduced amount of plasticizer extracted by n-hebutane. Vinyl tree AM10011 Dobe, 2) Acrylonitrile-butadiene copolymer 0.5-211! i part, 3) 20 to 60 parts rich in plasticizer.

To explain this, the present inventors have conducted various studies on vinyl chloride resin compositions with little plasticizer migration and elution. It has been found that the amount of plasticizer extracted by n-hebutane in films made from this composition can be greatly reduced by adding NBR (abbreviated as NBR). Oil resistance, cold resistance, and P8 non-migration, which causes plasticizers to migrate to polystyrene trays used for food packaging and cause cracks, are also mentioned above, so this film is suitable for packaging foods that use oil. It was confirmed that the deterioration of food packaging trays using this bridge film was reduced, and the present invention was completed by conducting research on the type and amount of NBR added. Ta.

The vinyl chloride resin as the component 1) constituting the vinyl chloride resin composition of the present invention may be a publicly available commercially available one, and may be a homopolymer of vinyl chloride or other polymers that can be copolymerized with the vinyl chloride resin. It may also be a copolymer with a vinyl monomer, such as vinyl acetate, or an olefin such as ethylene or propylene. However, this product is a packaging film, special C
2.Since it is used as a raw material for making food packaging films, it is preferable that the tortoise diameter is about 800 to 3,000 and the special C: is about 1,000 to 1,500.

NBR as component 2) may be a known NBR obtained by emulsion polymerization of acrylonitrile and butadiene, but in order to easily mix it with the vinyl chloride resin as component 1) described above (: powder This NBR has a wide range of compatibility with the vinyl chloride resin, and acts as a type of high molecular weight plasticizer that does not cause any volatilization, migration, or extraction from the vinyl chloride resin ItliIC. However, it is a new finding that when used in combination with other commonly known plasticizers, the plasticizer has the effect of reducing the amount of n-heptane extracted. It is.

If the blending amount of NBR is 0.5 parts by coul or less per 100 parts of vinyl chloride resin as component l), there is almost no effect of reduction before extraction by the plasticizer n-hebutane C, and 20 parts. Since the effect does not particularly increase even if the addition exceeds 0.5 to 20 tt parts, the special C: is 1
~10! It is recommended that the range be within the range of

In addition, for this NBRIm, acrylonitrile is 36 to 41% depending on the amount of acrylonitrile contained in C2.
high nitrile, 31-35% medium-high nitrile, 25-3
There are 0% medium-low nitrile ones and 18-24% low nitrile ones, but for the purpose of the present invention (2), acrylonitrile is used because of the balance between compatibility with vinyl chloride and plasticizer elution prevention effect. 20-50% by weight, especially 30-4
0% by weight, butashev 80-50 heavy dragon%, special C2 is 70%
It is preferable to set it to 1% of the ~bo army.

The plasticizer as component 3) constituting the composition of the present invention may be one commonly used in vinyl chloride resins, including phthalate esters such as dioctyl phthalate and dibutyl phthalate. , linear dibasic acid esters such as dioctyl adipate and dioctyl azelaate,
Phosphate esters such as tricresyl phosphate and tricylenyl phosphate, hydroxy polycarboxylic acid esters such as triethyl acetyl citrate and tributyl acetyl citrate, castor oil derivatives such as methyl acetylene root, soybean oil, linseed oil Examples include epoxidized vegetable oils such as epoxidized vegetable oils, ethylene glycol derivatives such as ethylene glycol esters of low fatty acids of ○, ~01°, and polyester plasticizers. Since it is considered to be a packaging film, it includes diisononyl adipate, adipic acid n-furkyl (made from a monovalent aliphatic alcohol with a carbon atom number of 6 to 10), acetyl tributyl citrate, and Evo car film. Preferably, the oil is selected from epoxidized soybean oil and epoxidized linseed oil. In addition, this plasticizer formulation t
Although it differs depending on the type, this is as follows: 1) 100 tt parts of vinyl chloride resin as a component C: On the other hand, if it is less than 20 parts by weight, the plasticizing effect for forming a soft film is insufficient, and if it is more than 60 parts, the plasticizing effect for forming a soft film is insufficient. This may result in excessive elongation and self-adhesion.
Just match the range of the department.

Next, examples of the present invention will be given, and parts in the examples indicate parts by weight.

Example 1 100 parts of vinyl chloride resin TK1300 (product name manufactured by Shin-Etsu Chemical Co., Ltd.), 30 parts of plasticizer-DINA, 10 parts of epoxidized soybean oil, 0a-Zn stabilizer (manufactured by Akishima Chemical Co., Ltd.)
A vinyl chloride resin composition was prepared by mixing 1 part of NBR/chemigum (product name manufactured by Gutdeyer Co., Ltd.) in the amount shown in Table 1 C2 in a Henschel mixer.
- A film with a thickness of 16 μm was formed by die extrusion molding, and the extrusion amount of the 1ffi agent based on n-heptane C was compared, and the results shown in Table 1 were obtained.

Table III Example 2 Vinyl chloride resin TK-1300 (Shin-Etsu Chemical Co., Ltd. 1
Product name) 100 parts C: 30 parts of DINA as a plasticizer, 10 parts of epoxidized soybean oil, 1 part of Oa-Zn composite stabilizer (manufactured by Akishima Chemical Co., Ltd.) and Table 182 [: Displayed amount of NB
R. Chemi Gum (trade name, manufactured by Gutdeyer) was added and mixed in a Henschel mixer to prepare a vinyl chloride resin composition.

Next, C2, from this composition, a thickness of 16 mm was formed by T-die extrusion molding.
A μm film was made, and the amount of plasticizer extracted by n-hebutane C2 was measured on this film.
When the cold resistance was examined by measuring the embrittlement temperature specified by K-7216m and the softness temperature using a Kratschberg softness temperature measuring device, the results shown in Table 2 were obtained.

In addition, this film C Ni-high impact polystyrene v
-) 0.33mmt (manufactured by Teikoku Kasei Co., Ltd., HIPS
sheet] and biaxially oriented polystyrene sheet 0.
251 [manufactured by Mitsubishi Monnant Co., Ltd., abbreviated as ops sheet] was heated with a press machine at a pressure of 20 KP/(X).
After pressing at room temperature for an hour, the tensile strength and elongation of this tray C were measured, and the results as shown in "fi3-71FC" were obtained.

Table 2

Claims (1)

[Scope of Claims] 1. A food product comprising: 1) 100 parts by weight of a vinyl chloride resin; 2) 0.5 to 20 parts by weight of an acrylonitrile-butadiene copolymer; and 3) 20 to 60 parts by weight of a plasticizer. Vinyl chloride resin composition for packaging films. 2. The vinyl chloride resin composition for food packaging films according to claim 1, wherein the acrylonitrile-butadiene copolymer contains 20 to 50% by weight of acrylonitrile and 50 to 80% by weight of butadiene. 3. Plasticizer is diisononyl adipate, di-adipate
The vinyl chloride resin composition for food packaging films according to claim 1, which is selected from n-alkyl, acetyl tributyl citrate, epoxidized soybean oil, and epoxidized linseed oil.