JP2002241145A - Cold end coating composition for glass container and glass container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cold end coating composition which does not cause the peeling of coating agent components from the surface of a glass container even after a sterilization procedure and, to provide a glass container coated with the composition. SOLUTION: The cold end coating composition for the glass container is a water-base composition containing a silane coupling agent having amino group and an emulsified polyethylene wax whose softening point is >=110 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold-end coating composition for glass containers and a glass container coated with the composition.

[0002]

2. Description of the Related Art Conventionally, anionic surfactants and nonionic surfactants have been used in order to increase the lubricity of the surface of a glass container so that scratches and the like are less likely to occur, and to thereby prevent strength deterioration due to scratches and the like. Cold end coating agents containing an aqueous emulsion of polyethylene wax and the like have been used. A conventional cold-end coating agent containing an aqueous emulsion of polyethylene wax has a composition in which the components are softened upon passing through a pasteurizer at 85 ° C., which is performed after the cold-end coating and after filling the contents into a glass container. And then peels off from the glass container surface due to friction with the conveyor guide or the like, resulting in a decrease in the lubricity imparted to the glass container surface or contaminating the conveyor guide with the separated cold end coating agent component. There is a problem that.

[0003]

According to the present invention, the resin coated on the surface of the glass container does not soften even after passing through a past riser at 85 ° C., and therefore, the glass component of the coating agent component can be maintained even after the sterilization treatment. An object of the present invention is to provide a cold-end coating composition and a glass container coated with the composition, which do not substantially cause problems such as a decrease in slipperiness of a glass container and a stain on a conveyor guide due to peeling from a container surface. And

[0004]

Means for Solving the Problems The present inventors have repeated studies to solve the above problems. As a result, in cold-end coating on the surface of a glass container, if a combination of a silane coupling agent and an aqueous emulsion of polyethylene wax having a higher softening point than conventional ones is used, the polyethylene wax can be firmly adhered to the surface of the glass container. It has been found that a coating having excellent performance can be achieved in which the resin is hardly softened even when exposed to a high temperature in a pastelizer, and as a result, the resin is hardly peeled off from the surface of the glass container even after the sterilization treatment. It has also been found that silane coupling agents having an amino group are particularly suitable for this purpose. The present invention
It is based on these findings.

That is, the present invention is an aqueous composition comprising (1) a silane coupling agent having an amino group and an emulsified polyethylene wax having a softening point of 110 ° C. or higher. A cold-end coating composition for glass containers, (2) the composition according to (1), wherein the concentration of the polyethylene wax is 0.05 to 0.5% by weight, and (3) a softening point of the polyethylene wax. (1) or (2) above 130 ° C.
(4) The composition according to any one of the above (1) to (3), which comprises a nonionic surfactant having a polyoxyethylene chain in its structure. (5) The composition according to any one of the above (1) to (4), which is a cold-end coating composition for a glass container subjected to a hot-end coating treatment, (6) the above-mentioned (1) to (5).
And (7) a glass container coated with the composition according to any one of the above (1) to (5), which is treated with a line simulator. The surface slip angle after the treatment in the case of treatment with hot water of 85 ° C. for 5 minutes is 13 ° or less, and the standard deviation of the surface slip angle of the glass container after the treatment by the line simulator is √. V ₁ , wherein, when the standard deviation of the surface slip angle of the glass container before the treatment by the line simulator is ΔV ₀ , ΔV ₁ −ΔV ₀ ≦ 0.3, Is provided.

The above-mentioned compositions (1) to (5) are used for cold-end coating on a glass container, whereby the resin is firmly adhered to the surface of the glass container.
In addition, even if the resin is exposed to a high temperature in a pasterizer, the resin is hardly softened, and a coating with excellent performance that the resin is hardly peeled off from the glass container surface even after the sterilization treatment can be achieved. Further, in the glass container described in the above (6) and (7), there is a substantial possibility that the coating agent component is peeled off after the sterilization treatment by the pastelizer to reduce the slipperiness of the glass container and to contaminate the conveyor guide. Has been removed.

[0007] In order to increase the strength of the glass container,
Hot-end coating (surface treatment with tin oxide) by contacting with a gas such as butyltin trichloride after molding and before slow cooling is often performed. However, the cold-end coating composition of the present invention is used for hot-end coating. It can also be suitably used for a glass container which has been used.

[0008]

DETAILED DESCRIPTION OF THE INVENTION Silane coupling agents have the general formula is represented by R _n SiX _4-n, a compound to both the organic and inorganic materials are used in various applications as affinity of the compounds, various Are commercially available. In the general formula,
X is a hydrolyzable group, for example, an alkoxy group,
Examples thereof include an acetoxy group, an oxime group, an enoxy group and an isocyanate group, and n represents an integer of 1 to 3. R is various organic groups having a carbon atom directly bonded to Si, for example, an alkyl group which may be substituted, an alkenyl group which may be substituted, and an atom other than carbon such as oxygen and nitrogen. And a group in which two or more alkyl groups which may be substituted, alkenyl groups which may be substituted, and the like are linked via the above. Various substituents of the silane coupling agent are known.
Among these various silane coupling agents, those having an amino group as a substituent are used in the present invention. The silane coupling agent R _n SiX _4-n has the property that the group X in the molecule undergoes hydrolysis in water and is gradually or quickly converted to the group OH. In the present invention, when referred to as "silane coupling agent having an amino group",
Both those in the form of R _n SiX _4-n and those in which hydrolysis has partially or completely proceeded are included.

The present inventors have found that a silane coupling agent having an amino group is extremely effective in firmly adhering a polyethylene wax to the surface of a glass container. With a silane coupling agent having no amino group, a sufficient adhesive effect cannot be obtained. The silane coupling agent used in the present invention is not particularly limited except that it has an amino group. Examples thereof include γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, and N-β-aminoethyl-. γ-aminopropyltrimethoxysilane, N-β-aminoethyl-
γ-aminopropyltriethoxysilane, N-β-aminoethyl-γ-aminopropylmethyldimethoxysilane and the like can be mentioned.

The concentration of the silane coupling agent in the composition of the present invention is preferably 0.01 to 1% by weight,
More preferably, it is 0.05 to 0.5% by weight. If the concentration of the silane coupling agent is less than 0.01% by weight, the adhesion strength of the polyethylene coating to the surface of the glass container may be reduced. 1% by weight silane coupling agent concentration
Even if increased, the effect does not change and is not economical.

The composition of the present invention contains an emulsified polyethylene wax having a softening point of 110 ° C. or higher and a silane coupling agent having an amino group (including a partially or completely hydrolyzed product). Is a mandatory requirement. If the softening point of the polyethylene wax is less than 110 ° C., the resin coated on the surface of the glass container is softened when passing through a past riser at 85 ° C., and then peeled off by friction with a conveyor guide or the like, and the surface of the glass container is peeled off. The lubricity of the tire may be impaired. The softening point of the polyethylene wax is more preferably 130 ° C. or higher in order to further enhance the above effect. The type of the polyethylene wax is not particularly limited, and examples thereof include low-polymerization degree polyethylene having a softening point of 110 ° C. or higher, more preferably 130 ° C. or higher, and partial oxides of such low-polymerization degree polyethylene.

The concentration of polyethylene wax in the cold end coating composition of the present invention is 0.05 to 0.5.
% By weight. If the polyethylene wax concentration is less than 0.05% by weight, sufficient lubricity may not be obtained. Conversely, if the polyethylene wax concentration exceeds 0.5% by weight, the outer surface of the glass container becomes slightly opaque, and the appearance may be deteriorated, and the economic efficiency is poor.

Further, the composition of the present invention preferably contains a nonionic surfactant having a polyoxyethylene chain in its structure as a surfactant for uniformly emulsifying and dispersing the polyethylene wax in water. Such a nonionic surfactant is not particularly limited except that it has a polyoxyethylene chain in its structure. For example, polyhydric alcohol ester ethylene oxide adduct, polyethylene glycol monoester, polyethylene glycol diester, higher alcohol ethylene oxide addition Products, alkylphenol ethylene oxide adducts and the like.

In the present specification, the term "aqueous composition" means a composition containing water as a main medium, and does not exclude coexistence of another medium miscible with water. Further, in the present specification, the “polyethylene wax in an emulsified state” refers to a state in which the polyethylene wax is finely dispersed in a medium.

In order to perform cold end coating with the glass cold end coating composition of the present invention, it is sufficient to simply spray the outer surface of a heated glass container. At that time, the heating temperature of the glass container may be appropriate. However, considering work efficiency, it is usually about 90
Preferably, it is in the range of about to about 130C.

By coating a glass container with the composition of the present invention, a line simulator is used.
C. for 5 minutes using hot water at 100 ° C., followed by the Japan Glass Bottle Association standard (established on June 15, 1977, October 1998).
(May 30, revised (3)) 7.14 The surface slip angle of the glass container when measured based on the surface slip angle measuring method can be made 13 ° or less. In addition, the above 85
When the standard deviation of the surface slip angle of the glass container after the line simulator treatment at 5 ° C. for 5 minutes was ΔV ₁ , and the standard deviation of the surface slip angle of the glass container before the line simulator treatment was ΔV ₀ , By coating the glass container with the composition, it can be kept in the range of ΔV ₁ −ΔV ₀ ≦ 0.3. Here, the standard deviation ΔV when n data are measured is defined by the following equation.

[0017]

(Equation 1)

When the surface slip angle is measured by the above standard method, when the polyethylene coating is partially removed from the surface of the glass container, the standard deviation of the surface slip angle generally increases sharply. In the glass container coated with the composition described above, since the polyethylene coating is very unlikely to fall off from the surface thereof, the increase in the standard deviation of the surface slip angle is suppressed even after the line simulator treatment.

The apparatus and method used for evaluation in the present invention will be described below. 1. Line Simulator: As used herein, "line simulator" refers to the glass bottle industry as a means to experimentally predict the physical damage that would normally be applied to the surface of a glass container that has been placed in distribution after manufacture. It refers to a test device manufactured by American Glass Research Inc. (AGR International, INC., Butler, PA, USA) which has been conventionally used. Various settings, such as the structure and dimensions, and how to use them are as follows.

FIG. 1 is a schematic diagram of a line simulator viewed from a side. The line simulator has a rotating disk 1 (made of stainless steel) inside a cover 18 having an open upper part, which is formed in a substantially cylindrical shape and forms an outer frame of the apparatus main body, and is fixed to this upper surface. A rotating disk 2 (made by Bakelite) having the same diameter that rotates together with the rotating disk 1 is provided. The rotating disks 1 and 2 are driven by a motor 3 and rotated at a predetermined speed. Along the entire inner wall of the cover 18, plastic guide rails 4 each having a substantially circular cross section are provided in an annular shape in two stages, upper and lower. On the rotating disk 2, one of the circular exchange plates 7, which is selected in accordance with the size from among four sizes according to the size of the glass container to be tested, is mounted, and is rotated by a screw-type fixture having a handle 8. Attached to the shafts of disks 1 and 2. The exchange plate 7 is provided with a bracket 6 along its outer periphery, and on the outer periphery of the bracket 6, plastic guide rails 5 having a substantially circular cross section are provided annularly in upper and lower two stages. In the figure, three spacers 9 are inserted below the rotating disk 1. These spacers 9 which can be separated individually serve to support the rotating disk 1 from below and are used for adjusting the height of the rotating disk 1. That is, depending on the height of the glass container to be tested,
According to the rules described later, some of the spacers 9 (0 to 3)
Is inserted between the rotating disk 2 and the exchange plate 7 so that the rotating disk 1 (and thus the rotating disk 2 at the same time)
Height is adjusted. The glass containers to be tested are arranged upright on the rotating disc 2 between the guide rails 4 and 5.

In FIG. 1, reference numeral 10 denotes a gate projecting above the rotating disk 2. The gate 10 is in the form of a lever rotatably supported about a vertical axis at a fulcrum located outside the cover 18 as illustrated in detail in FIG. It is arranged so as to pass through and protrude inside the cover 18 and above the rotating disk 2. 1, only the tip of the lever of the gate 10 is shown. One end of a helical spring 11 is attached to the gate 10 near its tip. A block 19 having a female screw penetrating therethrough is fixed to the outer surface of the cover 18. Gate adjustment screw 20a
Is screwed into the female screw, and the tip of the gate adjusting screw 20 a projects through the block 19 to the inside of the cover 18. The other end of the helical spring 11 is attached to the tip of the gate adjustment screw 20a. 20b
Is a gate adjustment fixing screw. By turning this around the adjusted gate adjustment screw 20a and pressing it against the block 19, the gate adjustment screw 20a can be fixed at that position so as not to move.

In FIG. 1, reference numeral 12 denotes a spray head for spraying water (cold water or hot water) on the outer surface of a glass container placed on the rotating disk 2 (inner diameter of a jet port is 2 m).
m). The sprayed water is the rotating discs 1 and 2 and the cover 1
8, and falls into the drain trap 14 from the gap between the circular aluminum plate 16 and the cover 18, which are inclined downward at the outer circumference, and falls into the drain trap 14.
5 is discharged. The rotation time of the rotating disks 1 and 2 is set to a predetermined length by operating the set timer 13.

FIG. 2 is a plan view showing the structure near the gate 10 of the line simulator shown in FIG. As shown in FIG. 2, the gate 10 is supported so as to be rotatable around a vertical axis about a fulcrum A. The helical spring 11 has one end attached to the tip of the gate adjustment screw 20a, and the other end attached to a columnar pin provided near the tip of the gate 10. Gate 10
A thin rubber pad 10a is adhered to a surface that comes into contact with the glass container, and the rubber pad 10a functions as a cushion that prevents the glass container from coming into contact with a metal part constituting the gate 10. 21 and 22 represent two of the glass containers arranged in the apparatus. In the test, a large number of glass containers are arranged on the rotating disk 2 between the guide rails 4 and 5 in a manner described below. Arrows indicate the direction of rotation of the rotating disk 2.

Referring to FIG. 2, the dimensions of each part are as follows. 1) Inner diameter of guide rail 4 ... 61.3 cm 2) Outer diameter of cover 18 ... 63.7 cm 3) Minimum distance between outer periphery of cover 18 and fulcrum A ...
1.9cm 4) Angle between the central axis of the gate adjustment screw and the fulcrum A with respect to the central axis of the rotating disk 1 26.3 ° 5) Distance between the fulcrum A and the tip of the gate 17.8cm

<Method of Selecting Exchange Plate> The exchange plates 7 (Nos. 1 to 4) of four different sizes with the bracket 6 and the guide rail 5 have the guide rail 5
Has an outer diameter of 48.3 cm (No. 1) and 44.5 cm, respectively.
cm (No. 2), 40.3 cm (No. 3) and 3
2.0 cm (No. 4). The size of the exchange plate 7 used in the test is selected according to the outer diameter of the glass container. That is: 1) Glass container outer diameter 58.4 mm or less N
o. 1 2) Glass container outer diameter 58.4 to 73.7 mm ... N
o. 2 3) Glass container outer diameter 73.7 to 96.5 mm ... N
o. 3 4) Glass container outer diameter 96.5-129.5 mm ... N
o. 4

<Arrangement Method of Spacer> The spacer 9 shown in FIG. 1 is arranged in accordance with the height of the glass container to be tested.
It is arranged as follows. That is: 1) Container height of 228.6 mm or less: All three spacers 9 are arranged between the rotating disk 1 and the aluminum plate 16. 2) Container height 152.4 to 254.0 mm: Two spacers 9 are arranged between the rotating disk 1 and the aluminum plate 16, and one spacer 9 is used as the rotating disk 2 and the exchange plate. 7 is arranged. 3) Container height 177.8 to 279.4 mm: one spacer 9 is arranged between the rotating disk 1 and the aluminum plate 16, and two spacers 9 are replaced with the rotating disk 2 and the exchange plate. 7 is arranged. 4) Container height 203.2 to 304.8 mm ... All three spacers 9 are arranged between the rotating disk 2 and the exchange plate 7.

<Gate Adjustment Method> See FIG. After the gate adjustment screw 20a is fully retracted, one of the glass containers to be tested is placed between the gate 10 and the guide rail 5.
The central axis of the gate adjustment screw 20a is sandwiched so as to pass through the central axis of the glass container. While maintaining the positional relationship, the helical spring 11 is compressed by tightening the gate adjustment screw 20a and moving the screw forward. The tip of the gate adjusting screw 20 a is provided near the tip of the gate 10, and the helical spring 1
When it comes into contact with a columnar pin for attaching 1, the screwing of the gate adjustment screw 20 a is stopped, and the gate adjustment screw 20 a is reversed and retracted by 12.7 mm from that position. Next, the gate adjustment screw is fixed to the retracted position by tightening the gate adjustment fixing screw 20b. Here, the helical spring 11 used in the line simulator has a natural length of 3.6 cm, a length of 1.3 cm when the tip of the gate adjustment screw 20a hits a cylindrical pin near the tip of the gate 10, and Spring constant 65.
4 N / cm.

<Rotational speed and amount of water ejected> The number of revolutions of the rotating disks 1 and 2 ··· 35 rotations / minute The amount of water ejected from the spray head 12 ··· 300 mL
/ Min

<Usage Method> According to the above-mentioned respective rules, the exchange plate 7 and the spacer 9 are attached according to the outer diameter and height of the glass container to be tested, and the gate is adjusted and fixed. Along the inner circumference of the guide rail 4
In a state where the glass containers are in contact with the inner periphery, the glass containers are arranged in a line so as not to leave a gap between the glass containers until the space between the first glass container and the last glass container is less than one glass container. Line up. The set timer 13 is set to a desired time, and the temperature of water jetted from the spray head 12 is set. Start rotation of rotating disks 1 and 2,
The apparatus is operated for a set length of time while spraying water from the spray head onto the outer surface of the glass container.

<Function of Line Simulator> As the rotating disks 1 and 2 rotate, the glass containers (21, 22, etc.) placed thereon are sequentially sent to the gate 10, and the gate 10 is pushed one after another. The gate 10 is pushed and spreads against the bias of the helical spring 11, and at that time, a collision occurs between the front and rear glass containers. By placing the glass container in this state for a certain period of time, the line simulator process can evaluate the physical damage that can be applied to the outer surface of the glass container placed in the distribution process in a shorter time under more severe conditions To

2. Surface slip angle measurement method Japan Glass Bottle Association standard (established on June 15, 1977, October 1998
Revised on March 30 (3)) "7.14 Surface slip angle measurement method"
Specifies that surface slip angles should be measured for glass bottles according to the following procedure and criteria. <Sample> (1) Sample bottle: Collect the bottle after the coating agent has completely dried, and let the bottle cool to room temperature to obtain a sample bottle. (2) Collection of sample bottles: Collect 9 or more sample bottles for each measurement. However, do not touch the bottle body surface during sampling or measurement. <Measurement Method> (See FIG. 3) (1) The sample bottles 32 and 33 are arranged in contact with the bottle holding table 34, and the bottle bottom is brought into close contact with the stopper.
And 33 are applied so that they do not shift laterally. (2) Place sample bottles 31 on sample bottles 32 and 33 and stack them in a triangle. (3) All three sample bottles are arranged in the same direction, and the surfaces of the bottles should be in direct contact with each other, avoiding engraved or seamed surfaces. (4) The handle 36 is turned to gradually tilt the bottle holder, and the scale at the position where the sample bottle 31 starts to slide is read and recorded. (5) For measurement, use three bottles for one measurement and do not use it again for measurement. However, the measurement is performed three times or more.

[0032]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but it is not intended that the present invention be limited to these examples. [Example 1] Aqueous emulsion of polyethylene wax (AC # 392 polyethylene wax emulsion manufactured by Allied Chemical Company, resin softening point 138 ° C, solid content about 4
(0%) Distilled water was added to 270 g to make 99 L (solution A-1). Further, distilled water was added to 100 mL of γ-aminopropyltriethoxysilane (A-1100 manufactured by Nippon Unicar Co., Ltd.) as a silane coupling agent having an amino group to make 1 L (solution B-1). Solution A-1 and solution B-1 were mixed to make a total of 100 L, and this solution was used as a cold end coating composition.

Next, a glass container for drinks having a capacity of 120 mL and having a hot-end coating on the surface by a conventional method was prepared, and these were kept at 110 ° C. for 60 minutes in a thermostatic dryer. The cold end coating composition was transferred to a cup of a hand-operated spray gun, and the spray amount and the pressure of the air supplied from the compressor were adjusted with the spray gun to adjust the spray amount to 60.
Fixed to mL / min. Next, the glass containers heated to about 110 ° C. are placed one by one in the center of the turntable,
By spraying the cold-end coating composition on the glass container from a distance of about 30 cm while rotating the turntable twice (one second or less), the composition is uniformly applied to the outer surface of the glass container. It was applied without dripping. After the application, the glass container was allowed to cool to room temperature in this state. This procedure provided the required number of cold-end coated glass containers for the following tests.

The cold-end coated glass containers were divided into three groups of the same number, and two groups of the glass containers (the number of sets was 41 each. The outer diameter of the body of the container was 48.6 m).
m) per line simulator (American Glass Research (AGR International, INC., Butler, PA, US
A)) (each at 19 ° C. for 5 minutes or 8
(5 ° C., 5 minutes) (using exchange plate No. 1).
The remaining one group was not subjected to the line simulator treatment and served as a control group. The evaluation of the smoothness of the glass container surface of each group was performed based on the Japan Glass Bottle Association Standard 7.14 Surface Slip Angle Measurement Method. As a result of the measurement, the surface slip angle of the glass container of the control group was 9 ° at the maximum, 5 ° at the minimum, and 7.
0 ° and the standard deviation ΔV ₀ was 0.723.
The surface slip angle of the glass container after the line simulator treatment at 19 ° C. for 5 minutes was 10 ° at the maximum, 6 ° at the minimum, and 8.
1 ° and the standard deviation ΔV _1C is 0.830, thus:
√V _{1 C-} √V ₀ = 0.107. 85 ° C,
The surface slip angle of the glass container after the line simulator treatment for 5 minutes is 11 ° at the maximum, 7 ° at the minimum, and 8.2 ° on average, and the standard deviation ΔV ₁ is 0.885, therefore, ΔV ₁ −√
V ₀ was 0.162. These things, 19 ℃,
This shows that peeling of the polyethylene film hardly occurred in any of the line simulator treatments for 5 minutes and 85 ° C. for 5 minutes.

Comparative Example 1 (Conventional product) Aqueous emulsion of polyethylene wax (AC manufactured by Allied Chemical Co., Ltd.)
Distilled water was added to 153.5 g of # 629 polyethylene wax emulsion, resin softening point 104 ° C., solid content about 43%) to make 99 L (A-2 solution). 8.7 g of potassium hydroxide (manufactured by Ishizu Pharmaceutical Co., Ltd.) was dissolved in 500 mL of distilled water, and oleic acid (Wako Pure Chemical Industries, Ltd.) was added thereto.
43.5 g) was added little by little with stirring, and distilled water was further added to make the total volume 1 L (solution C-1). A-2
The solution and C-1 solution were mixed to obtain 100 L of a solution, which was used as a cold end coating composition.

Thereafter, the glass containers were cold-end coated in the same manner as in Example 1, and the glass containers were subjected to grouping and line simulator treatment in the same manner as in Example 1, and then the surface slip angle was measured. The surface slip angle of the glass container of the control group not subjected to the line simulator treatment was 7 ° at the maximum, 4 ° at the minimum, 5.5 ° on average, and the standard deviation ΔV ₀ was 0.694. 19 ° C, 5
The surface slip angle of the glass container treated by the line simulator for 1 minute is 16 ° at maximum, 8 ° at minimum, and 10.7 ° on average
And the standard deviation ΔV _1C was 1.867. Also,
The surface slip angle of the glass container subjected to the line simulator treatment at 85 ° C. for 5 minutes was 18 ° at the maximum, 9 ° at the minimum, 11.4 ° on average, and the standard deviation ΔV ₁ was 1.706. Therefore, in the treatment at 19 ° C. for 5 minutes, ΔV _1C −ΔV ₀
= 1.173, 85 ° C., 5 minutes treatment: ΔV ₁ −ΔV ₀
= 1.012, which indicates that the peeling of the polyethylene film occurred remarkably by the line simulator treatment for 5 minutes under both the temperature conditions of 19 ° C and 85 ° C.

[Examples 2 to 7 and Comparative Examples 2 to 8] Using various cold end coating compositions prepared by the same procedure as in Example 1 and Comparative Example 1 while changing the components and concentrations, the same procedure was used. Was evaluated by cold end coating the glass container. Table 1 shows the composition, component concentration, and surface slip angle measurement results of each cold end coating composition, together with those of Example 1 and Comparative Example 1. The meaning of each symbol in Table 1 is as follows.・ AC # 392: AC # 392 manufactured by Allied Chemical Company
Polyethylene wax emulsion (resin softening point 138
° C) AC # 629: AC # 629 manufactured by Allied Chemical Company
Polyethylene wax emulsion (resin softening point 104
° C) ・ A-1100: γ-aminopropyltriethoxysilane (product name: A-1100) manufactured by Nippon Unicar Co., Ltd. ・ A-174: γ-methacryloxypropyltrimethoxysilane (product name) manufactured by Nippon Unicar Co., Ltd. : A-17
4) is shown respectively. • LS: Line simulator • Δ√V: (Standard deviation of surface slip angle of glass container after line simulator processing) − (Standard deviation of surface slip angle of glass container before line simulator processing) In Table 1, AC Concentrations for # 392 and AC # 629 indicate solids concentration.

[0038]

[Table 1]

As shown in the table, in the glass containers of Examples 2 to 7, the surface slip angle after the line simulator treatment was 12 ° at the maximum (at 19 ° C. and 85 ° C. in Example 2, And 85 ° C treatment of Example 7).
Further, Δ√V in the glass container of each of these examples was 0.295 at the maximum (at 19 ° C. in Example 3).
Δ√V in the 5 ° C. treatment was 0.256 at the maximum (Example 3). In contrast, in the glass containers of Comparative Examples 2 to 8, the maximum value of the surface slip angle after the line simulator treatment did not exceed 13 ° only at the 19 ° C treatment of Comparative Example 8, and in the other comparative examples. The maximum value of the surface slip angle is 1
It was in the range of 4-27. Further, Δ√V in the glass containers of Comparative Examples 2 to 8 was only 0.3 ° C. or less at 19 ° C. treatment in Comparative Example 8, and all other Comparative Examples exceeded 0.3. Moreover, in many cases, the value was significantly larger than 0.3.

From the above results obtained for Examples 1 to 7 and Comparative Examples 1 to 8, the cold-end coating composition for glass of the present invention, in contrast to the comparative examples including the conventional products, was obtained using a sterilizing apparatus. It can be seen that a polyethylene coating that is resistant to treatment, hardly peels off, and has excellent adhesion is formed on the surface of the glass container.

[0041]

The cold-end coating composition of the present invention forms a polyethylene film having excellent heat resistance and adhesiveness on the surface of a glass container. No, giving a better cold end coated glass container than before.

[Brief description of the drawings]

FIG. 1 is a schematic view of a line simulator viewed from a side.

FIG. 2 is a plan view showing a structure near a gate of the line simulator.

FIG. 3 is a schematic diagram showing a method for measuring a surface slip angle.

[Explanation of symbols]

1 = rotating disk (made of stainless steel), 2 = rotating disk (made of Bakelite), 3 = motor, 4 = guide rail, 5 =
Guide rail, 6 = bracket, 7 = replacement plate, 8
= Handle, 9 = spacer, 10 = gate, 11 = spring, 12 = spray head, 13 = set timer, 1
4 = Drain trap, 15 = Drain connection port, 16
= Aluminum plate, 17 = packing, 18 = cover, 19 =
Block, 20a = gate adjustment screw, 20b = gate adjustment fixing screw, 21 = glass container, 22 = glass container. 31-33 = sample bottle, 34 = bottle holder, 35 = scale plate, 36 = handle, 37 = parallel adjustment screw

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C09D 123/04 C09D 123/04 123/26 123/26 183/08 183/08 F term (reference) 4D075 CA09 CA13 CA18 DA13 DA20 DB13 DC43 EA06 EA13 EA37 EB13 EB43 EB53 EB56 EC35 EC45 EC54 4G059 AA04 AC30 FA03 FA07 FA30 FB06 4J038 CB021 CB022 CB141 CB142 DF042 DL081 DL082 KA09 MA08 MA10 NA11 NA12 NA14 PB04 PC03

Claims (7)

[Claims] 1. A cold-end coating for a glass container, which is an aqueous composition comprising a silane coupling agent having an amino group and an emulsified polyethylene wax having a softening point of 110 ° C. or higher. Composition. 2. The polyethylene wax having a concentration of 0.05.
The composition of claim 1, wherein the composition is about 0.5% by weight. 3. The softening point of the polyethylene wax is 130.
The composition according to claim 1, wherein the composition has a temperature of at least 0 ° C. 4. The composition according to claim 1, further comprising a nonionic surfactant having a polyoxyethylene chain in the structure. 5. The composition according to claim 1, which is a cold-end coating composition for a glass container subjected to a hot-end coating treatment. 6. A glass container coated with the composition according to claim 1. 7. The composition according to claim 1, wherein
Glass container coated with
5 minutes using hot water at 85 ° C by in simulator
When the surface slip angle after the treatment is 13
° or less and the processing by the line simulator
The standard deviation of the surface slip angle of the glass container after
V ₁The gala before the processing by the line simulator
The standard deviation of the surface slip angle of₀And when
√V₁−√V₀Glass container characterized by ≦ 0.3
vessel.