JPS5933139A - Flexible plastic packing material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flexible plastic packaging material that is flexible and elastic, and has excellent heat resistance, cold resistance, oil resistance, and chemical resistance.

Conventionally, thermoplastic synthetic resin films such as polyolefin resin films and vinyl chloride resin films are used as plastic films for packaging because they are inexpensive and have good productivity. There were problems with cold resistance, oil resistance, chemical resistance, and strength. on the other hand,
A thermoplastic polyester-based elastic material with a high elastic modulus and excellent oil and chemical resistance has been developed.

Since the chilled F-7-tomer has an anti-component specific volume sieve that develops the above-mentioned characteristics, as the i degree increases, it rapidly melts at the 'melting point' and the melt viscosity rapidly decreases. When it comes out of the mold when it is made into a film, a so-called sagging phenomenon occurs, so it is used in structural parts such as anti-vibration bearings, seat belt parts, and lightweight tires in the automotive field, and in the mechanical field. Backings, belts, hot curlers, dryer parts, knobs, etc. are all used as structural products in the home appliance field, and are processed into thin packaging materials such as films or sheets and used for packaging bags and bag-like containers. The present invention has been developed in view of the current situation, and has nine characteristics of rubber. , heat resistant edges, heat aging resistance, and wide range of oil resistance without loss of properties even in low flow conditions.
It was developed for the purpose of being a flexible plastic packaging material with chemical resistance, and is a polyester elastomer consisting of a crystalline aromatic polyester segment and a non-grade polyether segment. ! :, polyolefin resin layer, vinyl chloride, i w Sodo Mari is characterized by having been integrated with an acrylic resin layer by coextrusion.

: In the present invention, a single layer of polyester elastomer, a polyolefin resin layer, a polyvinyl chloride/l/type resin layer, a polyester elastomer layer, a polyester elastomer layer, a polyester elastomer layer, a polyester elastomer layer, a polyester segment, a polyester segment, and a non-grade ester segment, are used in the present invention. □ is acrylic′
: Either one of the electric resin layer and the other layer may be used as the back layer, but it is not necessarily limited to two layers. A polyamide resin layer, a vinyl chloride/L' resin layer, or an acrylic resin layer is used, and one surface layer is used on both sides of the intermediate layer, and a crystalline aromatic polyester resin layer, a vinyl chloride/l' resin layer, or an acrylic resin layer is used. , Yayag, 7) Yop, ``4'b'' Boi 7 pieces, 3 types.

We made a special plan by approaching the first layer of the stoma, and used polyester/L'-based elastomer i consisting of crystalline aromatic BORI step segments and non-grade polyether segments as the intermediate layer, and the surfaces on both sides of the intermediate layer. A polyolefin resin layer, a vinyl chloride/L' resin layer, or an acrylic resin layer are bonded together as layers to form 31゛3 layers and 7'C,! l)
, or it may be more than T-layer depending on the application.
In either structure, the respective thicknesses of the polyester may be the same or different, and in any case, the single layer of polyester elastomer and the synthetic resin layer have the same inflation.・Integrate multiple joints by co-extrusion such as extrusion.

The polyester and lv type elastomer used in the present invention consists of a crystalline aromatic polyester segment and a non-grade polyether segment, and its characteristic value is a thermoplastic, and its characteristic values are as follows. Surface hardness (test method JI8: Otsu 30/)g
q, melting point (flow tester) /7・O,・°Q, softening point (JI8 K 430./) / 20. "C, embrittlement temperature (JI8 to Otsu30/) -70℃, flexural modulus (AS
'I'M D790. ),,t 20~. It can be used in a wide temperature range from high and wet to low flow. There is something. ,on the other hand,.

The synthetic resin layer to be bonded and integrated with this polyester elastomer is ethylene-vinyl acetate copolymer or polyethylene, as there is a risk of delamination if the melt viscosity and SP value are not close to that of the polyester elastomer. It is limited to polyolefin resins such as resins, vinyl chloride resins, and acrylic resins. However,
Polyester/I/based elastomer: As mentioned above, mer has rubber-like elasticity, excellent mechanical performance, and heat resistance.
Although it has rare favorable performance in terms of cold resistance and weather resistance, it was thought that it could not be made into a film because it would cause a so-called sagging phenomenon when it came out of the mold even if it was tried to be molded into a film. In the present invention, co-extrusion such as inflation co-extrusion is carried out with polyolefin resins, vinyl chloride resins, or acrylic V-based resins that have good bonding properties with polyester elastomers and can be stably formed into a film.・As a result, it is possible to form a film or sheet consisting of multiple layers in which the two are strongly bonded and integrated.

The flammable plastic packaging material formed in this way, consisting of a single layer of polyester elastomer, a polyolefin resin, and a synthetic resin layer of either vinyl (vinyl chloride) or acrylic resin, has both layers firmly bonded. It has the excellent elasticity and wide range of oil and chemical resistance of polyester elastomers, as well as the conventional excellent properties of polyolefin resins, vinyl chloride resins, or acrylic/I-/based resins. It is possible to obtain a flammable plastic packaging material with unparalleled excellent properties, for example, one layer of polyester/L/type elastomer with a thickness of 2μ and a layer of ethylene-vinyl acetate copolymer with a thickness of 7μ as both surface layers. When a 100μ three-layer film is formed with the interlayer as a combined layer, its softening point is raised to about 7.20°C, which is higher than ethylene-vinyl acetate copolymer, which has a softening point of around 60°C and has poor cold resistance. It has excellent heat resistance and cold resistance, eliminating the drawbacks of low thermoplastic synthetic resins. In addition, when a polyolefin resin layer, a vinyl chloride/L/based resin layer, or an acrylic resin layer is used as the intermediate layer, and a polyester elastomer layer is placed on both sides of the intermediate layer, the intermediate layer is sandwiched between the three layers. Since the intermediate layer is completely encapsulated, even if a vinyl chloride/l'-based resin layer, which requires a plasticizer, is used as the intermediate layer, the plasticizer will not affect the packaged product. In addition, since the surface layer is a single layer of polyester/l'-based elastomer on both sides, a packaging material with particularly excellent oil resistance and chemical resistance can be obtained, and the elasticity is further improved. Since it will not be fused to any glassy layer other than the polyester thread elastomer after it is made into a polyester yarn, applications that effectively utilize this property are attracting attention. Furthermore, a polyester/L'-based elastomer Ie is used as an intermediate layer, and a polyolefin resin layer, a vinyl chloride resin layer, or an acrylic resin layer is placed on the screen as a surface layer, sandwiching the intermediate layer. In this case, the surface layer on both sides is a synthetic resin layer that has been used in many cases in the past, so based on our extensive experience, we can use a wide range of techniques such as printing, coloring, and adhesion on the surface.Moreover, the middle layer is made of polyester. By using only one layer of polyester elastomer, the extremely excellent properties of polyester elastomer can be fully exhibited. In this case, it is also possible to provide a packaging material with desirable surface properties by layering different types of synthetic resin on both sides. In addition, the thickness of each layer may be the same or different as described above, but in general, a single layer of expensive polyester/L/based elastomer is often made thinner than a synthetic resin layer, and a two-layer structure is used. In the case of a three-layer structure with one layer of polyester elastomer as the surface layer, the wall thickness ratio of the former and the latter is approximately /:/~/: on the left. ;/~/:3
In the case of a three-layer structure with one layer of polyester elastomer as the middle layer and a synthetic resin layer as the surface layer, the wall thickness ratio is about 0.
：／～／：! It has been experimentally confirmed that all of the above levels are effective9, and in any case, the thickness of each layer is adjusted to suit the purpose of use in terms of elasticity, oil resistance, chemical resistance, moldability, price, and mass productivity. It may be determined by considering the following.

As is clear from the above description, the present invention includes a layer of polyolefin resin, which is a thermoplastic synthetic resin that is easily compatible with a thermoplastic polyester elastomer layer, which has conventionally been considered difficult to form into a film, and a layer of polyolefin resin, which is a polyvinyl chloride resin layer, which is easily compatible with the thermoplastic polyester elastomer layer, which has traditionally been difficult to form into a film. It is made into a film or sheet-like flexible blank packaging material that does not peel between multiple layers by bonding and integrating it with layers or acrylic resin layers by inflation coextrusion.
It takes advantage of the features of polyester elastomers, which have the widest range of resistance from low flow to high temperatures among the thermoplastic elastomer group, and also has the advantage of high rebound resilience and excellent spring properties. Combined with the advantages of high impact resistance, high load capacity, and easy application technology, it is widely used in the liquid packaging field and other various packaging fields as a solution to the problems of conventional plastic packaging materials. This is an extremely significant contribution to the development of the industry.

Claims (1)

[Claims] A single layer of polyester/I/ based elastomer made of crystalline aromatic polyester segments and non-grade polyether segments, and a polyolefin based resin layer, a vinyl chloride based resin layer or an acrylic based resin layer. A flexible plastic packaging material characterized by being integrated by co-extrusion. 21 Claims consisting of two layers: a polyester elastomer layer consisting of a crystalline aromatic polyester segment and a non-quality polyether segment, and a polyolefin resin layer, a vinyl chloride resin layer, or an acrylic resin layer. The flammable plastic packaging material according to item 1. 3. The intermediate layer is a polyolefin resin layer, vinyl chloride resin layer, or acrylic resin layer, and the surface layer bonded and integrated on both sides is a crystalline aromatic polyester segment)
Polyester that is different from non-quality polyether segments/
1. A flexible plastic packaging material according to claim 1, comprising a single layer of l/type elastomer. Ge, the intermediate layer is a polyester elastomer layer consisting of a crystalline aromatic polyester μ segment and a non-grade polyether segment, and the surface layer bonded and integrated on both sides is a polyolefin resin layer and a vinyl chloride lV resin layer. Alternatively, the flammable plastic packaging material according to claim 1, which has an acrylic resin layer.