JP2000006937A - Polyester resin bottle with handle, and handle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyester resin bottle having a handle and to provide a handle in which a crystallization for making white at the handle can be carried out at a comparatively low temperature. SOLUTION: There is provided a polyester resin bottle having a handle in which a holding handle 3 is fixed to a container main body 1 comprised of a plug 5, a shoulder 6, a barrel 7 and a bottom. The container main body 1 is made of polyester resin having as its raw material polyethylene terephthalate. The handle 3 is a reproduced product made of polyester resin having as its major raw material polyethylene terephthalate, wherein a limit viscosity of polyester resin is 0.68 or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester resin bottle provided with a handle using a recycled polyester resin, and more particularly to an intrinsic viscosity (hereinafter referred to as IV) specific to the handle.
The present invention relates to a bottle made of a polyester resin with a handle, which uses a recycled product of a polyester resin having the following formula:

[0002]

2. Description of the Related Art Polyester resins containing polyethylene terephthalate as a main raw material are widely used for bottles filled with soft drinks, alcoholic beverages, soy sauces, etc. due to their excellent properties. Also, there are large bottles and the like in which a separately formed grip is attached to a container body for operational safety and convenience.

Many of these grips are made of polyethylene,
Polyolefin resins such as polypropylene are used.

A method for mounting the grip by injection molding in a mold in which the container main body is molded, a method in which a grip pre-injected in a molding die is mounted, and the container main body is molded and mounted simultaneously. The container body and the handle are separately formed, and the handle is attached to the container body by a method of attaching the handle to the container body.

[0005]

These polyester resin bottles are crushed, washed, and reused for reuse after use.
Recycled and pulverized products are passed through processes such as separation, and are recycled into fibers, films and bottles for use.

However, polyethylene as a grip for gripping,
Bottles using a polyolefin resin such as polypropylene require a method of separating the polyethylene terephthalate and polyolefin resin using a separation device during the regeneration process, so the grip for gripping is also required.
It has been proposed to use a polyester resin such as polyethylene terephthalate to eliminate the need for separation.

However, there is no problem when the raw material of the grip for gripping is a so-called virgin raw material in which the polyester resin is not a recycled product. Since the raw material becomes slightly yellowish due to heat history, the gripping handle formed by reuse may be received as if there is a quality problem.

It is an object of the present invention to provide a novel polyester resin bottle with a handle and a handle that solves such problems.

[0009]

The above object is achieved by the following means.

That is, the present invention relates to a polyester bottle with a handle in which a grip for handle is attached to a container body comprising a plug portion, a shoulder portion, a body portion, and a bottom portion, wherein the container body is mainly made of polyethylene terephthalate. A polyester resin with a handle, wherein the handle is a regenerated product of a polyester resin whose main raw material is polyethylene terephthalate and whose main viscosity is a polyester resin having an extreme viscosity of 0.68 or less. The present invention proposes a bottle and a handle, wherein at least the surface of the handle is crystallized and whitened.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view, partially in section, of a bottle with a handle showing an example of the present invention.

The polyester bottle with a handle of the present invention comprises a container body 1 and a grip 3 as shown in FIG. 1. The container body 1 is made of a biaxially stretched polyester resin made of polyethylene terephthalate as a main raw material. It is molded to form a plug portion 5, a shoulder portion 6, a body portion 7, and a bottom portion (not shown).
Is formed.

In this embodiment, the grip 3 comprises a grip portion 31 and a locking portion 4 extending from above and below into the grip mounting recess 2 of the container body 1. The protrusion 41 is attached to the container main body 1 by engaging the concave and convex with the engaging concave portions 211 and 221 formed in the deep portions of the upper and lower surfaces 21 and 22 of the handle mounting concave portion 2.

In the present invention, the polyester resin constituting the container body is mainly a homopolymer of polyethylene terephthalate having ethylene terephthalate as a main repeating unit, and a part of the terephthalic acid component is, for example, isophthalic acid, 2,6- Naphthalene dicarboxylic acid or the like may be blended. Further, a part of the ethylene glycol component, for example, diethylene glycol, propylene glycol or the like may be blended.

In the present invention, the polyester resin constituting the grip for gripping is a molded product such as a bottle of the polyester resin or a regenerated product of a virgin raw material. Usually, the bottle is crushed, and the crushed product (flakes) is After passing through processes such as washing and drying, they are formed into granules (pellets) by heating with an extruder. It is the most preferable form that the polyester resin is a 100% recycled product from the viewpoint of effective use of the recycled product, but the recycled product does not necessarily have to be 100%.

The point is that the crushed material (flakes) or granules (pellets) before forming into a grip for grip, or the intrinsic viscosity of the grip for grip formed is "Intrinsic viscosity: tetrachloroethane / phenol = 40/60 mixed solvent. Dissolved in water and measured at 20 ° C. ”is 0.68 or less, usually 0.65
Must be ~ 0.55.

Furthermore, the molded gripping handle is a recycled product of a polyester resin whose main raw material is polyethylene terephthalate, and is made of a polyester resin having an intrinsic viscosity of 0.68 or less, and at least the surface thereof is formed. Spherulite crystals must be whitened.

The intrinsic viscosity of the recycled polyester resin constituting the grip for gripping is 0.68 or less, usually 0.65.
０．６0.55, and above 0.69, 1
If the temperature is not higher than about 00 ° C., crystallization does not proceed, and energy loss at the time of whitening occurs.

On the other hand, the intrinsic viscosity is 0.68 or less, usually 0.65 to 0.55, and crystallization easily proceeds even at a relatively low temperature of around 90 ° C. or less. Energy loss during whitening is small.

The reason is that the regenerated polyester resin having a low intrinsic viscosity has a reduced crystallization temperature, in other words, a reduced crystallization temperature and a raised crystallization temperature after quenching with a decrease in molecular weight. "Measure by raising the temperature at a rate of 10 ° C./min after melting at 300 ° C." is lower than 110 to 140 ° C. compared to 150 to 200 ° C. of the virgin polyester resin.

In order to whiten at least the surface of the handle by spherulite crystallizing, a crystallized portion may be formed by heat treatment at a relatively low temperature of around 90 ° C.

By whitening only the surface in this way, the energy required for whitening can be reduced and the effect of making yellowish less noticeable is large.

Almost the entire handle may be whitened, in which case it can be easily obtained by increasing the temperature and time of the heat treatment.

[0025]

According to the present invention, since the grip for holding a polyester resin bottle is formed from a recycled polyester resin having a specific IV value, crystallization for whitening the handle is relatively easy at a relatively low temperature. Energy loss can be reduced. In addition, at least the surface of the handle is spherulite crystal and whitened and molded,
The yellowish color generated due to the heat history in the regeneration process becomes slightly inconspicuous.

[Brief description of the drawings]

FIG. 1 is a partial sectional front view showing an example of a polyester resin bottle with a handle of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 2 Recess for attaching a handle 3 Handle for grasping 4 Locking part 5 Plug part 6 Shoulder part 7 Body 21 Upper surface 22 Lower surface 211, 221 Engaging recess 31 Gripping part 41 Locking projection

Claims (4)

[Claims] Claims: 1. A polyester bottle with a handle, wherein a handle for gripping is attached to a container body comprising a plug portion, a shoulder portion, a body portion, and a bottom portion, wherein the container body is made of polyethylene terephthalate as a main raw material. A bottle made of a polyester resin with a handle, wherein the handle is a regenerated product of a polyester resin mainly made of polyethylene terephthalate, and the main material is a polyester resin having an extreme viscosity of 0.68 or less. 2. A handle which is a regenerated product of a polyester resin containing polyethylene terephthalate as a main raw material, wherein the polyester resin has an extreme viscosity of 0.68 or less as a main raw material. 3. The polyester resin bottle with a handle according to claim 1, wherein at least the surface of the handle is crystallized and whitened. 4. The handle according to claim 2, wherein at least the surface of the handle is crystallized and whitened.