JPS60110742A - Vinyl chloride resin composition for stretched film - Google Patents

Abstract

PURPOSE:To obtain a resin composition which exhibits excellent extrusion stability and film-forming properties and improved self-tack, and is free of hard spots, by incorporating a tackifying plasticizer and an epoxy plasticizer in specified proportions into a vinyl chloride resin. CONSTITUTION:15-40pts.wt. tackifying plasticizer (A), and an epoxy plasticizer (B) are incorporated into 100pts.wt. vinyl chloride resin, (A)+(B) being 30- 55pts.wt. in total. Preferably a vinyl chloride resin to be used is a homopolymer of vinyl chloride or a copolymer of vinyl chloride with copolymerizable monomers; a tackifying plasticizer is glyceryl monolauryl diacetate alone or glyceryl monolauryl diacetate together with an epoxidized linseed oil butyl ester; and an epoxy plasticizer is an epoxidized soybean oil or an epoxidized linseed oil.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vinyl chloride resin composition for use in stretch films for packaging, mainly for food products, which has excellent self-adhesive properties.

Conventionally, so-called stretch packaging, which utilizes the elasticity and self-adhesive properties of plastic films, has been widely used for packaging foods such as meat, fresh fish, and other foods in containers called trays.

This stretch packaging has a simple packaging style, prevents food loss and deterioration of freshness, and is hygienic.Furthermore, since the film is wrapped under tension, the packaging looks beautiful and increases product value. It has characteristics such as low packaging cost.

By the way, the following properties are required of the film used for this stretch packaging.

(1) Excellent optical properties such as transparency and gloss.

(2) Excellent anti-fog properties, self-adhesive properties, and heat-sealing properties.

(3) Excessive softness, elasticity, vertical/horizontal strength balance, and restrained elongation.

(4) Sumi ink has excellent cold resistance.

(5) Appropriate surface smoothness and excellent resistance to automatic packaging machines.

(6) Appropriate permeability of barron and carbon dioxide gas, and low water vapor permeability.

The film that has been widely used in the past due to the above-mentioned properties is soft polyvinyl chloride yarn film (hereinafter abbreviated as PVC film), and in addition to this, polyolefin yarn film and polyptazoene yarn film are also used. There are, but
Nothing comparable to PVC film in terms of performance has yet been obtained.

By the way, the composition of PVC film is generally composed of an azopic acid-based plasticizer as the main plasticizer and an epoxy-based plasticizer added as an auxiliary plasticizer. Many plasticizers are called secondary plasticizers and are not sufficiently compatible with vinyl chloride resins, so even though the total amount of plasticizers is as high as 60 to 55 parts by volume, the melt viscosity is low. The gelation rate of granular compounds is slow, and in other words, when extrusion molding, YM
It is difficult to easily adjust the degree and pressure if the molding conditions are not sufficiently considered (
! 1: There were disadvantages in that a so-called unbathed melt was generated, and the extrusion rate fluctuated over time, resulting in insufficient film formation stability. On the other hand, since the film requires self-adhesive properties for its intended use, this self-adhesive property is imparted by increasing the total amount of plasticizer and bleeding it, and it is also partially controlled using a surfactant called an anti-slip agent. However, there is a limit to the total amount of OT plastic processing, and the adjustment range for interfacial viscosity agents is not very wide, so it is like being stuck in water when packaging vegetables and other stocks! In the case of sweet, there is a problem in that the adhesion between the films is particularly poor.

As a result of various studies to solve the above-mentioned problems of non-gelling, variation in extrusion rate, and insufficient film tackiness, we settled on the following connections.

The present invention has excellent extrusion stability and film-forming properties, does not cause lumps, and is self-adhesive by using a composition containing a vinyl chloride resin, a plasticizer that imparts permanence properties, and an epoxy plasticizer as main components. The present invention provides a vinyl chloride resin composition for stretch films that has improved adhesiveness. That is, the present invention provides (A
) 15 to 4 parts by weight of a tackifying plasticizer, (B) 6 to 15 parts by weight of an epoxy plasticizer, and the accounting value of (A) + (Bl is 6 to 55 parts by weight) This is Hatabe and it is % intense.

The vinyl chloride-based 41111J# used in the present invention includes homopolymers of vinyl chloride and polymers that can be used in combination with vinyl, ethylene, propylene, and α-olefins.

Next, the plasticizers to be added to the vinyl chloride thread tsukudashi include (N) The plasticizers that impart layering properties include (1) glyceryl monolauryl diacetate alone, (II) glyceryl monolauryl diacetate and epoxidized linseed. oil butyl ester (hereinafter referred to as 11LOB), (+li+glyceryl monolauryl diacetate and ELOB and siisononyl azopic acid (hereinafter referred to as DiNA) or carbon number 6.
Adipic acid (n-
hexyl, n-octyl, n-decyl) (hereinafter referred to as Dn 6
-8-1 OA), (iv) glyceryl monolauryl diacetate and DiNA and/or Lln 6-
8-1 OA (B) As an epoxy plasticizer, fAJ group + tBJ of epoxidized soybean oil (hereinafter referred to as ESBO) and/or epoxidized linseed oil (hereinafter referred to as ELO)
selected from the group.

In addition, when using the selected AIJ together, it is necessary to use a tackifying agent of 15 to 40 ml of a tackifier belonging to the N# group and a 6 to 15 ml of an epoxy plasticizer belonging to the tBJ group to the vinyl chloride resin. If the total amount of BJ is less than 304 parts, the film flexibility and self-adhesiveness are insufficient. However, if the total amount of (A) + (Bl) exceeds 55 parts by weight, 8 parts by weight, both non-softening and self-viscosity properties become excessive.

Furthermore, the ratio between group (A) and group (131) is (N
If the plasticizer in tJ+ is less than 15 parts by weight, (BI Jf
Even if 15 tons of plasticizer was added to the film, the film would still lack flexibility and self-stretching properties. Next, if the plasticizer of group (B) exceeds 40 parts by weight, the self-adhesiveness will be excessive and the resistance during film unwinding will become too large. Stability is poor, extrusion processability decreases, and if the extrusion process exceeds 15 mm, stains and the like will occur on the die during extrusion, resulting in a decrease in "early output υ1".

The value of (N!pF viscosity-imparting plastic) of the present invention is 15~
40j
It part and ELOB 3-15 parts by weight, total 15-4
I like Koki who is a 0ton treasurer. That is, ELOB is
If it exceeds 15 parts by weight, the self-adhesiveness will be excessive compared to glyceryl monolauryl diacetate alone, and the film unwinding resistance will become too large.

In addition, (river) no M8- has glyceryl monolaurylzoacetate 9-28 overlapped part, +r;LoB3-15 part and DiNA or Dn6-8-1'OA3-9 overlapped part, total 15 ~40 parts of salt, (lv) 1
．． Glyceryl monolaurylzoacetate 9-67 parts, DiNA and/or Dn 6-8-1 OA each 6-67 parts
Preferably, the dosage is 9 portions, for a total of 15 to 40 portions.

In addition, in the present invention, in addition to the above-mentioned oJ TjlJ agents, stabilizers, chelator-1 lubrication agents, Kaiichiden activators, color retardants, antioxidants, ultraviolet leg absorbers, etc. may be used as necessary. I also have ink to add.

The vinyl chloride resin composition of the present invention is produced by adding the above-mentioned specific plasticizing agent and other additives as necessary to the vinyl chloride resin composition using a mixer such as a Henschel or a ribbon blender. It is obtained by mixing according to a conventionally known method.The briar octopus side fat composition is formed into a film having a thickness of about 10 to 20 microns by a known film forming method, ie, a T-die method or an inflation method.

The present invention will be explained in detail below with reference to Examples.

Examples 1 to 9 Vinyl chloride Kiritate (Kiki Kagaku Kogyo (4'l 4!!% trade name Denkabinyl 88-11O-8) 100 parts and the respective painting weights and calcium-q1 of the plasticizers shown in the table !
1.0 parts by weight of lead-based stabilizer, sorbitan yarn interface 1-occupancy A+
J1.0 amount part, glycerin-based world self-activating agent skin 5 turtle part,
Each compound was prepared by heating and mixing 0.5 mjf part of a higher alcohol EO adduct surfactant in a jacketed Henschel mixer.

Next, this compound was extruded at 65 ml/m for 200
Extruded at ~205°C, +x 500 m/m wall thickness approx. 1
A 7μ film was obtained. It had excellent extrudability, lumps in the film, and self-adhesive force. Show the results to Tatsu.

Comparative Examples 1 to 5 Example ♂ except that the plasticizer chilled material was as shown in the table.
A similar operation was performed. Extrudability, in-film adhesiveness, and self-viscosity were poor. The results are shown in the table.

The physical properties were measured using the following method.

1) Extrusion amount: The extrusion h4 per minute was measured 10 times, and the average value (X) and range (R) of the extrusion (value) were determined.

2) Fu: 2Q ctlt x 2Q cnt The average value of 10 films was determined to determine whether there were unnumbered particles of 0.5m+πφ or more in one film.

6) Thickness from self-adhesive crab roll is about 1ytyis about 2
[Cut out a 1cm x 20 cut sheet. Next, cut out a piece of 10C/ft x 15Cr/L accurately from this sheet, and make sure that there is no air between the films.
1! +1. 10 cm of these two films
One end of the + corner is partially peeled off, and a paperboard measuring 1 cm wide x 12 α long is fastened to the 10 cIIL wide end using cello/'% nteno.

Next, hold this paperboard part with a chuck with a tensile test < a and peel off the film at a tensile speed of 200 tan for 7 minutes and measure the peel resistance.The average value of 10 samples was 55 to 80 jj/cm. It was defined as the range of self-destruction.

The plasticizers in the table are as follows.

1) Glyceryl monolauryl diacetate: Buken Vitamin (manufactured by I Tou, trade name PL-012J2) ELOB:
Epoxidized linseed oil butyl ester, [ADEKA ARGASU Co., Ltd., trade name L-178J3] DiNA: Diisononyl azopic acid "Sanbe Kako ((1st item also trade name DiNA)
J 4) Dn 6-8-10 A: Azopic acid zo(n-
Hexyl, n-octyl, n-decyl phosphorus [Dainippon Ink Chemical Co., Ltd., product name Dn610AJ5] ESBO:
Epoxidized soybean oil, [ADEKA ARGUS (M-SOU, 1 glue product name o150PJ 6) ELO: Epoxidized linseed oil [ADEKA ARGUS (
Ceramic, product name 0180AJ

Claims (1)

[Claims] 15 to 40 parts by weight of viscosity-imparting plasticizer per 100 parts of vinyl chloride resin (B) 6 to 40 parts by weight of epoxy plasticizer
1. A vinyl chloride resin composition for a stretch film, characterized in that the total amount of (A) + (B) is 60 to 55 parts by weight.