JPS5828377A - Opaque plastic vessel with transparent section and its manufacture - 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 an opaque plastic container having a transparent portion and a method for manufacturing the same. More specifically, the present invention provides a container made of an opaque plastic container which is made by blow molding or injection molding after an opaque compounding process or an opaque process, and a method for manufacturing the same. Regarding.

In recent years, plastic containers, especially hollow molded products, have come to be used in large quantities for food, detergents, cosmetics, and other containers, replacing various glass containers as packaging materials. The reason why plastic containers have been replaced in this way is thought to be that plastic containers are lighter in weight and have appropriate strength compared to glass containers, they can be molded into containers of various shapes, and they are economical. As with plastic containers, in addition to transparent items, semi-transparent items and opaque items can also be manufactured in the same way as glass containers (hereinafter, semi-transparent items and opaque items are collectively referred to as ``opaque items'').However, if a part of the vessel wall An opaque plastic container made transparent and a method for manufacturing the same are unknown.

On the other hand, a part of the surface of a transparent glass container can be easily made opaque by treatment using the Sandbutest method or by etching with hydrofluoric acid.

In this way, a glass container with transparent and opaque parts coexists.
ii.Currently, it is used in containers for fashionable products such as high-end cosmetics.

By the way, the reason why the above-mentioned opaque plastic container with a partially transparent container wall is not known is that such a secondary processing method is different from that for films, sheets, etc., and the object is three-dimensional. Therefore, rounding is considered to have been extremely difficult.

The present inventor conducted extensive research in order to invent a plastic container that can replace partially transparent opaque glass containers and a method for manufacturing the same. As a result, a ■-H opaque container was manufactured by first using an essentially transparent plastic as a raw material and applying an opaque treatment to the material during molding to make it opaque. When manufacturing an opaque container, a transparent film of a certain resin is placed on the surface of the mold in advance and fused during molding. □The present invention was completed based on the knowledge that it is possible to make the coated or fused portion transparent (including semi-transparent).

As is clear from the above description, the purpose of the present invention is to
A second object of the present invention is to provide a unique plastic container having a transparent portion and a method for manufacturing the same, and to provide a use in which the container can be substituted for a corresponding glass container. Other purposes will become clear from the description below.

The first invention of the present invention is as follows: (1) A transparent resin is blended or treated to make it opaque, and the container is molded by blue molding or injection molding, and a part of the wall of the container has a transparent part due to the opaque treatment. Opaque plastic container.

(2) The container of the 13th JI, which uses vinyl chloride resin, polystyrene, polypropylene, polymethyl methacrylate, polyester, polycarbonate, or ABS@ resin as the transparent resin.

(3) The container according to item 2 above, which is made by copolymerizing vinyl chloride and a small amount of polyethylene glycol dimethacrylate or a small amount of polyethylene glyfur diacrylate and using Jiuzhen fat as the opaque compounding resin.

(4) A small amount of highly polymerized MBSm as an opacifying compounding material
The container according to item jI2 above, which uses an opacifying blended resin blended with N1, <1-1 engineered ethylene propylene rubber.

(m) The container according to item 1 above, which is molded using nine embossed grains on the mold as an opaque treatment, or is molded in a low position.

(@, vinyl chloride resin, polystyrene, polypropylene, polymethyl methacrylate, polyester, polycarbonate) AE
2. The container according to item 1, wherein a transparent film made of a material selected from S@fat, vinegar, cellulose resin, and cellophane is placed and specially bonded.

(?) As a transparent treatment, vinyl chloride resin, polystyrene, polypropylene,
The container according to item 1 above, which is coated with polymethyl methacrylate, polyester, polycarbonate, or kBs@fat (D melt or solution).

The second invention of the present invention is as follows: (2)■ A part of the wall of a plastic container obtained by mixing a transparent resin to make it opaque and performing P4-molding or L-injection molding. (2) Transparent resin is processed to make it opaque using a textured mold or a low temperature that can be molded during blow molding or injection molding of the transparent resin, and during the opaque processing, the An opaque plastic container having a transparent part, characterized in that a part of the container wall of the plastic container obtained by placing a transparent resin film on a part of the mold is treated to make it transparent! ! Law.

(By applying a melt or solution of transparent material) (9)
Transparent resins include vinyl chloride resin, polystyrene, polypropylene, polymethyl methacrylate, polyester, polycarbonate) fiL < is AH8ll! The method for manufacturing a container according to item 8 above, which uses fat.

(To) A method for producing a container according to item 8 above, which uses a copolymerized resin of vinyl chloride and a small amount of polyethylene glycol dimethacrylate or a small amount of polyethylene glycol diacrylate as the opacifying compound resin. (B) Opacifying compound material as a small amount of highly polymerized MBSI
! The method for producing a container according to item 8 above, which uses an opaque blended resin blended with lubricant or ethylene propylene rubber.

Hereinafter, W= will be explained in detail.

B6 Transparency O used in the present invention (first and second inventions): The resin (plastic) used in the present invention is thermoplastic and has an essentially transparent composition when normally molded.
is obtained. Many general-purpose resins can be used as the resin, examples include vinyl chloride-fat,
Polystyrene, polypropylene, polymethyl methacrylate (all of which include copolymers of vinyl chloride, styrene, propylene, or dimethyl methacrylate of 5 or more by weight and other monomers), polyester, polycarbonate, and AB8Ill It's fat. On the other hand, resins that are not transparent resins include, for example, medium-low pressure polyethylene, natural rubber and synthetic rubber, 7 ether resin, and melamine resin. If these essentially non-transparent resins are used, the transparent treatment of the present invention will have no effect on the molded product.

The criteria for determining whether the resin is transparent or not is that the film is made of a film KIIi or WI with a thickness of 50 #, and that the light transmittance of the film is 80--preferably 85-- or higher.

B. Opaque formulation (material): The process of blue forming or injection forming (hereinafter both may be collectively referred to as "molding") the transparent resin used in the present invention is explained below. Perform an opacifying formulation or an opacifying process described below.

Reason for performing opacifying formulation, transparency 4! I! This is because if the tumor is molded as is (with only the usual stabilizers, etc.), a transparent molded product will be obtained, and the molded product will not be suitable for the transparent treatment described below.

However, the compounding material for making the molded product opaque can be any of the various known fillers that make the molded product opaque.
Certain limitations exist. Examples of such compounding materials include rubber materials such as MBS resin with a high degree of polymerization or ethylene propylene rubber (EPR), and these materials can be easily compounded into transparent resins. , molding 9
Although the product becomes opaque, the above (6) or (1) of the present invention
The part (vessel wall) of Jisei 111J& that has undergone the transparent treatment has the unique function of being transparent. The discovery of this function, together with the later-described transparency process, brought about the unique effects of the present invention, which were completely difficult to predict before the present invention was completed.

C. I + ui mixed with opacity; Unlike the above-mentioned opacity compounded resin, the transparent resin used in the present invention is a vinyl chloride resin. By copolymerizing a small amount of a specific other monomer, such as polyethylene glycol dimethacrylate or polyethylene glycol diacrylate, with the vinyl chloride monomer at the vinyl chloride monomer stage, a substantially opaque compound can be obtained. become. Such copolymers can be used as opacifying formulation materials when mixed into vinyl chloride formulations. The polyethylene glycol dimethacrylate or polyethylene glycol diacrylate to be copolymerized with the vinyl chloride monomer is preferably a polyethylene glycol-y moiety polymerized [n is 2 to 20 degrees, preferably 5 to 1511 degrees, preferably 4, and the total monomer The weight ratio of polyethylene glycol methacrylate, etc., is CL2-5, preferably α5-3. +1
If the amount is less than 2, the opacification effect will be insufficient, and if it exceeds 5, the effect will not be improved.The copolymerization method is similar to the known polymerization method of vinyl chloride.

2. Opaque processing: Unlike the above-mentioned case of directly molding the transparent resin compounded with opacity, in the present invention, the transparent resin (
Although the molded product is molded as is (with a transparent formulation), the molded product may be made opaque by selecting processing conditions during molding. The processing conditions are: (1) using a textured mold for molding, or (2) keeping the molding temperature as low as possible to make the surface of the molded product (container) opaque. Methods (1) and (2) may be used in combination. As a specific method for embossing, the surface of the mold may be uniformly marked with a countless number of colors.As shown in the example below, a metal lid with a smooth interior is placed on the surface using a sand plate or the like. Etching may also be applied. Keeping the molding temperature as low as possible means lowering the minimum injection rate (
or blowing) means the temperature of the Wli liquid (or die temperature) [-, in the case of polypropylene compositions, a250c
degree, in the case of polyvinyl chloride compositions, is 1 eocli degree. In addition, even if the base resin (-1) is used, the molding temperature will be lower than when the resin is not blended, even if the blended resin has a low melting point (softening point) and good fluidity. can do.

E. Transparency treatment: The opaque plastic container according to the present invention is subjected to a certain transparency treatment during or after molding.

(2) Processing during molding: A transparent film of a certain resin is placed at a certain position on the mold, and the film is fused to a certain part of the target opaque plastic container by injection or with a hollow bottom lid. For fusing, a base in an acid type material is generally used*
It is preferable to use resins such as tr and transparent horizontally, but they do not have to be the same type of resin as long as complete fusion is possible.Although there are no limitations on the thickness or size of the film used, the present invention For the purpose of this, it is easy to use a film with a thickness of 10 to 20,077% and a size of 10 cm MIXIDaw.The film is attached to the gold surface by using an adhesive or solvent that is easy to peel off. However, if the film is flexible and has adhesive properties to the mold, it is of course unnecessary to use i# adhesive or the like. In this way, the opaque plastic container of the present invention is obtained in which the film is fused to a certain part of the object and only that part is made transparent.The mechanism of the transparency caused by the fusion is unclear, but it is tentatively explained as follows. It is inferred that

That is, when a mold with a grain is used, the inner part of the mold to which the film is attached is not affected by the acid grain, so that the original transparency of the resin is exhibited.

b. In the case of using an opacifying blended resin composition, the composition is cooled and solidified in a mold, in the melt of the product,
It is thought that the cooling rate of the contacting portion of the film is slower than that of other portions, and the fused surface is microscopically smoother than other portions.

■ Processing of the molding machine: A transparent film is pasted with adhesive on a certain part of the opaque plastic container after molding according to the present invention, as in the case of (2) above, and the film is coated with FilpJII.
! For the coating, (2) a melt or solution of a certain transparent resin is applied, and the resin is cooled to solidify or dried. As long as the transparent resin melt is vinyl chloride resin, polystyrene, polypropylene, polymethyl methacrylate, polyester, polycarbonate or AB8@ fat and does not lose its transparency, each of these resins may contain a known copolymer. The method for applying the sapling solution follows a known method.

Although the mechanism of the effects produced by the stretching, adhesion, or coating is unknown, it is presumed that it is due to microscopic smoothing of the surface of the molded product, as in the case of Φb.

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

Examples 1 to S, Reference Example 1 Hollow molded metal whose surface was etched by sandblasting method! (capacity 5005g, % flat type) using a hollow molding machine (Tahara Shoei Kiko@1so-extruder),
Hollow molded products were made using various 1N plastics.

The flat plate surfaces of these molded products were cut out and their light transmittance was measured using a haze meter (manufactured by Nippon Denshoku ■). Next, a transparent film 5X5ag made of the same material was placed on each of these flat plates.
A commercially available adhesive (CEMEDINE φ63
0), and the light transmittance of the flat plate after the adhesion was evaluated as 11 as described above.

When measuring the light transmittance, liquid paraffin was applied to the inner surface of the flat plate to eliminate the influence of the state of the white paper on the light transmittance.

1010, & Nisso Compound-BM205C transmittance was greatly improved by pasting the transparent film, and improved from around 20 mm before pasting to more than the ease of pasting. On the other hand, in the case of the reference example (low-pressure polyethylene), there was only a slight improvement in the light transmittance after pasting, and it is clear that the objective of transparency could not be achieved at all.

Example 4.5, Comparative Example 1.2 3 (l PHH
A vinyl chloride resin compound having the following composition (Example 4) was prepared using a vinyl chloride resin containing a plasticizer (Biborit SE manufactured by Chisso ■, "P = 7 [10)" to which a transparent film was attached. Hollow blow molding, cutting of a flat plate, and light transmittance were measured in the same manner as in Example 1, except that polypropylene (Chitsoborip 0-1010) was used (Example 5).In addition, as a comparative example, each hollow mold At the time, a book was molded without a transparent film attached to the mold, and a flat plate was cut out and the light transmittance was measured.

Table 2 Effect of attaching transparent film (Part I) Notes Composition of vinyl chloride resin powder used: Matting additive (methaprene) '410) 5PHR, octyltin slate o, 5pint, octyltin mercapto 2PHR
, polyethylene wax tPH-R, butyl stearate) I PI-1fL.

Epoxidized soybean oil 3P) IRorm*gAs is clear, the flat plate portion of the molded product of each actual woven example to which the transparent film was fused had a wider range of light rays than the corresponding non-fused flat plate of the comparative examples. It can be said that the transmittance has improved and the film has become substantially transparent. Furthermore, it is clear that the transparent film can be fused within a mold rather than laminated, and that the fused film does not need to be made of the same material as the plastic to be molded to be effective.

Same as Example 1 except that a transparent film of rigid vinyl chloride resin of LIJ7011 was pasted in advance on the flat plate part of the mold of the hollow molding machine, and a compound on the side of the vinyl chloride machine with the following composition was used. Hollow blow molding, cutting into flat plates, and light transmittance were measured.

In addition, as a comparative example, a mold was molded without a transparent film attached inside the mold during hollow molding, and a flat plate was cut out and the light transmittance was measured.

Table 3: Effect of attaching transparent film (Part I) Composition of vinyl chloride resin powder used: Copolymer of vinyl chloride (99,01) and polyethylene glycol diacrylate (η=10) (1,0%) 100PHB ,%
Octyl tin malate 0.5 PHR, octyl tin mercapto [15 PHR, montan acid wax 1 PHR, butyl stearate osPHR, stearin & 0.5 PHR,
Epoxidized soybean oil 5PH.

Practical Example 7.8, Comparative Example 4.5 Instead of pasting a transparent ψ film, a solvent bath of the same composition (concentration about 10 mm, coating area 3 mm) was applied. The procedure was carried out in the same manner as Actual Example 6 or Actual & Example 5 and 1iij except that it was dried. Regarding polypropylene, polybrohylene wax was used instead of crystalline polypropylene. In addition, as a comparative example, the solvent s*f:iet
The drying light transmittance was kept constant when the cloth was not dried. The results are shown in Table 4 below.

Composition of vinyl chloride l & buffing compound used;
Same as Example 6

Claims (1)

[Scope of Claims] (1) A transparent resin is blended to make it opaque, the garment is processed to make it opaque, and is made by blow molding or injection molding,
An opaque plastic container that has a transparent portion on a portion of its wall that has been treated to make it transparent. (2) The container according to claim (1), which uses vinyl chloride resin, polystyrene, polypropylene, polymethyl methacrylate, polyester, polycarbonate, or AB8 tung fat as the transparent plum fat. (3) Patent claim No. 11 (2) in which a resin obtained by copolymerizing vinyl chloride with a small amount of polyethylene glycol dimethacrylate or a small amount of polyethylene glyfur diacrylate is used as the opaque resin.
term container. (4) A small amount of highly polymerized MB8 as an opacifying compounding material
111 fat iL< is obtained by using an opacifying blended resin blended with ethylene propylene rubber.
2) Container. (6) The container according to claim (1), which uses a textured metal lid as an opaque treatment, or is formed at a low temperature at which it can be molded. (6'J clearing treatment in advance on the mold during molding with vinyl chloride tree layer, polystyrene, polypropylene, polymethyl methacrylate, polyester, polycarbonate),
The container according to claim 1, wherein a transparent film made of a material selected from AB8 resin, acetic acid fiber resin, and self-containing resin is placed and fused during molding. (7) As a transparent treatment, polyvinyl chloride resin, polystyrene, polypropylene,
A container according to claim (1), which is coated with a melt or solution of polymethyl methacrylate, polyester, polycarbonate, or kB8 resin. (2) ■ A transparent resin is blended to make it opaque and blow molded or injection molded, and then a part of the wall of the plastic container obtained is coated with a melt or a liquid solution of the transparent material to make it transparent. 1) When the transparent resin is blow-molded or injection molded, it is opaquely processed using a textured mold or a moldable low temperature, and during the opaque process, the area on the mold is A method for manufacturing an opaque plastic container having a transparent part, which comprises treating a part of the container wall of the plastic container obtained by placing a film of clear wax thereon to make it transparent. - The method for producing a container according to claim (2), in which vinyl chloride**, polystyrene, polypropylene, polymethyl methacrylate, polyester, polycarbonate, or MuBS@fat is used as the transparent resin. A method for manufacturing a container according to claim 1, wherein a 9-fat resin is copolymerized with vinyl chloride and a small amount of polyethylene glycol dimethacrylate or a small amount of polyethylene dalicol diacrylate as a ring opacifying compound ballast. (b) A small amount of Takatofu IIMB8 as an opaque compounding material
A method for producing a container according to claim 1, which uses an opacifying blended resin blended with paulownia fat or ethylene brebylene rubber. Shaft Transparent materials include vinyl chloride resin, polystyrene,
Claim 11m that uses polypropylene, polymethyl methacrylate, polyester, polycarbonate, ▲BS paulownia fat, iron acetate miscellaneous resin or hep7γn!
Manufacturing method for the container specified in (self).