JPS60163045A - Main body of film cartridge - Google Patents

Abstract

PURPOSE:To enable reduction of wall thickness, enhancement of transparency, and improvement of fit tightness by using a specified propylene type resin. CONSTITUTION:The main body 1 of a film cartridge is made of a polymer having >=70wt% propylene monomer units, a melt index of 16-80g/10min, a tensile yielding point stress of 250kg/cm<2>, a bending elasticity of >=10,000kg/cm<2>, a notched Izod impact strength of >=2.0kg.cm/cm<2>, and an average circumference wall thickness of 0.4-1.2mm.. The polymer contains a nucleating agent, serving as ensuring said various physical properties. A wall thickness near a resin injection part 4 is made thicker than the average thicknesses of the walls 2, 7 to prevent pinholes. Since such a material has high strength, the main body 1 can be reduced in thickness and improved in the fit tightness of a cap 3. It is good in transparency and needs no pigment. Since the resin is good in fluidity, high speed molding is made possible, and a rate of deffective molded products can be reduced. The main body 1 can be used also for the outer case to lower its cost, and printing is made on the outer surface of the body 1 to enhance saleability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a film cartridge container body that can be made thin, has good fitting and sealing properties, and has high transparency.

[Prior art]

Conventionally, film cartridge container bodies have been made of high-density polyethylene or polypropylene with a melt index (MI) of around 10 g/10 minutes in order to ensure rigidity and prevent fringing and stringing during injection molding. Because of their poor transparency, they were usually colored by adding pigments1, which resulted in thick containers.
Moreover, the manufacturing process became longer, increasing manufacturing costs.

Further, Japanese Utility Model Publication No. 58-46413 discloses a film Rohne container made of a thin metal sheet material, but since the thin metal sheet material lacks light transmittance, it has the inconvenience of not being able to see the contents. be.

[Purpose of the invention]

The present invention solves these problems by providing a film/matrix container body that is thin, easy to manufacture, and has high light transmittance, and is characterized by using a specific plastic material.

[Structure of the invention]

That is, the present invention is based on a polymer having a nolopyrene unit content of 70% by weight or more, and an MI of 16-80y/10.
min, tensile yield point stress is 250'Kg/cm'' or more, flexural modulus is 10000kl?/z2 or more, and 20℃
The notched Izot impact strength is 2.0 floors・a
The present invention relates to a film cassette container body formed using a resin having a thickness of 0.4 to 1.2 + m on the average thickness of the peripheral wall portion, which is formed using a resin having a thickness of 0.4 to 1.2+ m.

The polymer that is the main component of the resin that forms the container body is
It is sufficient if the content of nolopylene units is 70% by weight or more, for example, polypropylene, preferably 1 ethylene unit.
Ethylene-nolopyrene random copolymers and block copolymers of 2 molti or less, particularly preferably 5 molti or less,
These include random copolymers and block copolymers with propylene containing less than 30% by weight of C4 to C1o α-olefin units, and blend polymers with various polymers.

The resin has an MI of 16-80g710min, preferably 20
~60Ji'/10 minutes, particularly preferably 30-50y/
10 minutes, the tensile yield point stress is 250 kg/cm2 or more, preferably 300 kg/ctn" or more, and the flexural modulus is 10000 kg/m2 or more, preferably 1500
0kg/z2 or more, and the notched Izo impact strength at 20°C is 2.0 R17・Can/Cm” or more. Furthermore, the transparency (HAZE) is 60 or more in terms of giving a favorable impression to stakeholders. Below, it is especially preferable that it is 40 inches or less.

A resin having such physical properties can be obtained, for example, by adding an appropriate amount of an organic or inorganic nucleating agent to the above-mentioned polymer.

The organic nucleating agent is Cal, 4? acid, dicarboxylic acid, salts and anhydrides thereof, salts and esters of aromatic sulfonic acids,
Aromatic phosphinic acid, aromatic phosphonic acid, aromatic carganic acid, its aluminum salt, aromatic phosphate gold maple salt, alkyl alcohol having 8 to 3 carbon atoms, condensate of polyhydric alcohol and aldehyde, and alkyl amine For example, aluminum pt-butylbenzoate, 1,3
, 2.4-dibenzylidene sorbitol, a zom-substituted penzylidene fulbitol compound represented by the following formula (wherein R1 and R2 are alkyl, alkoxy or halodane having 1 to 8 carbon atoms, and m and n are both O~3
and m+n≧1. ), metals such as calcium and magnesium stearyl lactate, and compounds represented by the following formula such as N-(2-hydroxyethyl)-stearylamine (wherein R is an aryal group having 8 to 30 carbon atoms). ), k and t are all θ~10 and +t≧
Get it in 1. ), 1.2-hydroyaxstearic acid lithium salt, sodium salt, potassium salt, (5) metal salts such as calcium salts and magnesium salts, alkyl alcohols such as stearyl alcohol and lauryl alcohol, sodium benzoate, benzoic acid, Contains nananogutic acid, etc.

Inorganic nucleating agents include alkali metal hydroxides such as lithium hydroxide, sodium hydroxide, and potassium hydroxide, alkali metal oxides such as sodium oxide, lithium carbonate, sodium carbonate, potassium carbonate, sodium hydrogen carbonate, and potassium hydrogen carbonate. alkaline metal carbonates such as calcium hydroxide, magnesium hydroxide, alkaline earth metal hydroxides such as chlorium hydroxide, and alkaline earth metal oxides such as calcium oxide.

The nucleating agent is not limited to these, and other known nucleating agents can also be used. Moreover, it goes without saying that the nucleating agent is not limited to being used alone, and that two or more types can be used in combination.

The amount of acid added as a nucleating agent is 0.01 to 100 parts by weight of the polymer.
Approximately 2.0 parts by weight is appropriate.

The nucleating agent may be added to the polymer by a general method of adding various additives to polyzolobyrene (6) or the like, and usually it is sufficient to add it to the polymer and knead it uniformly.

The effect of each building can be obtained by adding this nucleating agent. For example, 40 parts by weight of HAZE can be obtained by adding 01 parts by weight of paratertiary butylbenzoic acid as a nucleating agent to 100 parts by weight of a random copolymer of nolopyrene and ethylene as a polymer.
It can be reduced from 1 to 21%, and by adding 0.2 parts by weight, it can be further reduced to 12%. The yield point stress is, for example, 380 kg/ when 0.1 part by weight is added.
It can be improved from cm2 to 420 kg/α2, but even if more is added, there will be little improvement after that. Further, the flexural modulus can be improved from, for example, 500 kg/cm2 to 600 kg/cm2 by adding 0.1 parts I, but there is little improvement after that if more than that is added.

The shape of the container body of the present invention is not particularly limited as long as it can accommodate the film 1,000 torone, but it should have a shape that sufficiently fits and seals with the cap and that allows the cap to be easily attached and detached. In this respect, for example, the examples shown in FIG. 1 and FIG. 2 are suitable. In particular, the one shown in FIG. 1 has the advantage of being easy to open with one hand. The wall thickness of the container body 1 can be made thinner than that of conventional products, for example, the wall thickness of the peripheral wall portion 2 is about 0.4 to 1.2 mm, preferably 0.5 to 1.2 mm. O
Approximately tan is appropriate. The material of the shell 7°3 should preferably be softer than that of the container body 1 in order to fully exhibit these functions of the container body 1; for example, low density polyethylene is suitable.

The container body may normally be manufactured by injection molding. The injection molding method is not particularly limited, and for example, an in-mold vacuum method may be used. It is more efficient to use a mold that can mold multiple containers than one that can mold one container body, for example, one that can mold 12 or more container bodies at once with one mold.

In the case of injection molding, as shown in FIGS. 1 and 2, from the point where the resin protrusion 5 remains in the resin injection port 4,
This resin injection port 4 is 0.5 to 5I+Il+ from the bottom surface 6.
Although the hole is recessed by about 1 Wm, preferably about 1 to 3 Wm, the inventors of the present invention found that a hole is easily formed in this portion 4, especially when manufacturing the container body 1 of the present invention. In order to avoid this, it is preferable that the area around the resin injection port 4 be thicker than the average thickness of the bottom 7 as shown in the figure.

This means that the thickness of the container body 1 can be reduced, for example by 0.7
This is particularly important when the value is less than wn.

The method of molding the container body is not limited to injection molding, but injection blow molding or blow molding may be used as necessary.

Generally, a film no arm trone container is commercialized by being stored in a paper box as an outer box along with a film instruction manual, but since the container body of the present invention is also characterized by transparency, By using the outer box, it is possible to further demonstrate its characteristics and reduce costs. Examples of container bodies for such uses are shown in FIGS. 3 to 5. Figure 3 shows cylindrical shape, Figure 4 shows 4
The square cylinder shape, and the one in Figure 5 has a square outer shape and a circular storage part (9
) is an example.

〔Effect of the invention〕

The container body of the present invention can be made thin due to the high strength of the material, and has good fitting and sealing properties with the cap. Furthermore, since it is highly transparent, there is no need to use pigments. As a result, the amount of resin used can be reduced and the occurrence of short shots can be reduced. Furthermore, since the resin has good fluidity, the molding speed can be increased and the occurrence of molded products can be reduced. In addition, by using the capacitor body as the outer box, it is possible to reduce costs, add novelty to the product, and furthermore give the consumer a sense of security as they can confirm the contents. Furthermore, it is also effective to print on the outer surface to improve the commercial value or to add explanatory text.

〔Example〕

Using Sumitomo Heavy Industries' Nestal (trade name) as a molding machine,
A cartridge main body with a mold squeezing force of 150 t% and a number of 24 runners (10) - the type was a hot runner - was molded in the shape shown in FIG. 1 with a side wall thickness of 0.9 mm.

Conventional products include a polymer with a propylene unit content of 94 moles, a melt index of 12.3 g at 710 minutes, and a tensile yield point stress of 270 moles.
kg/2, flexural modulus 9,800 kg/cm”, 2
Notched Izot impact strength at o℃ is 3.5
kfl/cIn/crn: A random type polyzolopyrene resin containing no nucleating agent was used.

The product of the present invention is a polymer with a propylene content of 96 moles and a 4 mole of ethylene-containing acid, a melt index of 4.0.0 g/10 minutes, and a tensile yield stress of 3.
70 kg/crn”, flexural modulus 14,000 kg/
crn2. Izot impact strength with notch at 20℃ is 5.0 kl? -cmlon” and a random type polypropylene resin containing a nucleating agent was used.

Table 1 was obtained by comparing the two.

Table 1 Time Resin Temperature: Temperature of the resin when injected into the mold Short shot occurrence: The extent to which resin filling shortages occur when 100,000 pieces are injection molded (12) (11)

[Brief explanation of the drawing]

The drawings depict embodiments of the present invention, and FIGS. 1 and 2 are cross-sectional views of the container body and the cap. Figures 3 to 5 are perspective views of an example in which the outside can also be used. 1... Container body, 2... Surrounding wall portion, 3... Cap, 4... Resin injection port Patent applicant Fuji Photo Film Co., Ltd. Representative patent attorney
1) Masahiro Naka (13) Figure 3 Figure 4 Procedural amendment (voluntary) August 29, 1980 Manabu Shiga, Commissioner of the Japan Patent Office 1 Case indication patent application No. 18084 1984 2 Title film of the invention・Ya Draw: + Relationship with the case of the person making the 3rd amendment to the main body of the letter Patent applicant name Fuji Photo Film Co., Ltd. 4 Agent residence 3-21-3-6 Hatchobori 3-chome, Chuo-ku, Tokyo 104
Contents of amendment in Column 6 of Detailed Description of the Invention of Specification No. 07 The statement in the specification is amended as follows. Correction location Wrong Correct Page 3, line 12 “For example, poly” “For example, homopoly”
"Len, preferred""Ren, and preferred"〃 Line 18 "Furthermore""Furthermore, with the above polypropylene resin" Page 6, Line 12 "Substance, oxidation" [Substance, calcium carbonate, oxidation] Page 7, Line 7 [Fragrant acid 0 ．． IJ r aromatic acid 0. IJ8 page 1
Line 5 “In the main body” “The main body” Page 9 Line 3 “We are” “We are” Page 10 Line 11 “This weight” “This container” (2)

Claims (2)

[Claims] (1) A polymer with a zolopyrene unit content of 70% by weight or more), a melt index of 16 to 80971
0 minutes, tensile yield point stress of 250 kg/cm" or more, flexural modulus of 10,000 kg/m" or more, and notched Izot impact strength at 20°C of 2.0 mm/7 m/m.
A film cartridge container body formed using a resin having a thickness of 0.4 to 1.2 m and having an average thickness of 0.4 to 1.2 m on the peripheral wall. (2) The film cartridge container body according to claim 1, in which the resin contains a nucleating agent. (3) The film cartridge container body in the vicinity of the resin injection port is thicker than the average wall thickness. Film cartridge container body as described in scope 1