KR20190001532U - Integrated Closure for Medical Use - Google Patents

Abstract

The present invention relates to a rubber stopper for medical use, and more particularly to a medical stopper for medical use in which a plastic film is coated before rubber. The medical stopper of the present invention has a low manufacturing cost because of a small number of parts, When the injection needle is inserted before the rubber, there is no problem such that the rubber transfer is released or the air is introduced into the fluid bottle, so that the reliability of the product is high.

Description

{Integrated Closure for Medical Use}

The present invention relates to a medical integrated stopper, specifically to a medical integrated stopper in which a plastic film is coated before the rubber stopper.

In order to seal the liquid or the injection liquid, the liquid bottle, the liquid bag, and the vial, which is a container for storing the liquid or the injection liquid, the plastic body and the plug (rubber stopper) Closures, or caps made of rubber caps and aluminum caps assembled with plastic lids are mainly used.

The above-mentioned plastic material body and rubber stopper-type stopper are manufactured by separately manufacturing the plastic body and the rubber spring, or by assembling the plastic body by inserting the rubber spring. The thus manufactured plug is used after the plastic main body portion is adhered to the end of the plastic bag or the bag of the bag by heat bonding or the like.

On the other hand, in the case of a cap made of a rubber cap and an aluminum cap assembled with a plastic cap, a rubber cap is placed on the inlet of a sap bottle or a vial, an aluminum cap fitted with a plastic cap is covered with the rubber cap, To attach the cap.

However, such a conventional plug has a disadvantage in that the number of parts is large and the manufacturing process is complicated, and the manufacturing cost is high. In addition, when inserting a liquid set or a needle before a rubber, the bonding force between the stopper parts is weak and the rubber transfer is detached from the plastic main body, or a gap is formed between the stopper parts and air is introduced into the liquid bottle, There may be a problem of

The present invention provides a medical integrated cap which has a lower manufacturing cost than a conventional medical stopper and does not cause problems such as rubber breakage or leakage of air into the liquid bottle when the liquid set or the injection needle is inserted before the rubber.

According to one embodiment of the present invention, there is provided a bottle cap for a plastic material, the plastic film being coated on the rubber, and the plastic film being fusion-bonded to the end of the bottle by heat or ultrasonic waves.

Preferably, the rubber transition is made of a rubber selected from the group consisting of isoprene rubber, isobutylisoprene rubber and thermoplastic elastomer, and the plastic film is made of a plastic selected from the group consisting of polypropylene, high density polyethylene and cycloolefin copolymer .

Preferably, the rubber transition is made of isoprene rubber, and the liquid bottle and the plastic film are made of either polypropylene or high-density polyethylene.

According to another embodiment of the present invention, a stopper for a sealing port made of a plastic bag of a plastic material is formed by coating a plastic film before a rubber, and a medical integrated stopper in which the plastic film is fused to the end portion of the back seal port by heat or ultrasonic waves / RTI >

Preferably, the rubber transition is made of a rubber selected from the group consisting of isoprene rubber, isobutylisoprene rubber and thermoplastic elastomer, and the plastic film is selected from the group consisting of polypropylene, high density polyethylene and cycloolefin copolymer.

Preferably, the rubber transition is made of isoprene rubber, and the sealing port of the liquid bag and the plastic film are made of either polypropylene or high-density polyethylene.

According to another embodiment of the present invention, a plastic stopper for an injectable vial is provided, in which a plastic film is coated before the rubber, and an integral stopper is provided in which the plastic film is fused to the end of the injection vial by heat or ultrasonic.

Preferably, the rubber transition is made of a rubber selected from the group consisting of isoprene rubber, isobutylisoprene rubber and thermoplastic elastomer, and the plastic film is made of a plastic selected from the group consisting of polypropylene, high density polyethylene and cycloolefin copolymer .

Preferably, the rubber transition is made of isobutylisoprene rubber, and the injector vial and plastic film are made of cycloolefin copolymer.

According to the present invention, a medical integrated cap having a plastic film coated before rubber has a low number of parts and a simple manufacturing method, and thus a manufacturing cost is low. When the liquid set or the injection needle is inserted before the rubber, The reliability of the product is high because no problem such as inflow occurs.

1A is a perspective view showing a sap bottle and a cap for a sap bottle of the prior art.
1B is a cross-sectional view of a sap bottle and a cap for a sap bottle of the prior art.
FIG. 2A is a perspective view showing a plug for a sealing port of a liquid bag and a prior art liquid bag; FIG.
2B and 2C are cross-sectional views of a liquid bag and a cap for a sealing port of a prior art liquid bag.
Figure 3a is a perspective view showing an injection vial and a prior art injection vial cap;
Figures 3b-3d are cross-sectional views of an injection vial and a prior art injection vial cap.
4A is a perspective view showing a sap bottle and a cap for a sap bottle according to one embodiment of the present invention.
4B is a cross-sectional view of a sap bottle and a sap bottle cap according to an embodiment of the present invention.
FIG. 5A is a perspective view showing a plug for a sealing port of a liquid bag according to an embodiment of the liquid bag and the present invention; FIG.
5B and 5C are cross-sectional views of a cap for a sealing port of a sapabackage bag according to an embodiment of the present invention.
6A is a perspective view illustrating an injection vial and an injection vial cap according to one embodiment of the present invention.
Figures 6b and 6c are cross-sectional views of an injection vial and an injection vial cap according to one embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings in comparison with the prior art. In the drawings, the same or similar reference numerals are used for the same or equivalent. Also, throughout the specification, when a component is referred to as "comprising ", it means that it can include other components as well, without excluding other components, unless specifically stated otherwise.

A sap bottle and a cap for a sap bottle of the prior art will be described with reference to Figs. 1A and 1B. FIG. 1A is a perspective view showing a sap bottle and a conventional sap bottle cap, and FIG. 1B is a cross-sectional view taken along the line A-A of FIG. 1A of a sap bottle and a cap of a conventional sap bottle.

Saline bottles containing liquids such as saline, nutrients, and glucose that are kept sealed from the outside can be made of glass or plastic. For example, a small (e.g., 100 ml capacity) infusion bottle 100 may be made of plastic such as polypropylene. In the case of a small infusion bottle made of polypropylene, a cap made of polypropylene and a cap made of a rubber cap and an aluminum cap assembled with a plastic cap or a plastic cap are mainly used (the latter cap Will be described later with reference to Figs. 3A to 3D).

A conventional plug 200 having a cap body made of polypropylene and rubber-bonded to the cap body has a cap body 210 made of polypropylene manufactured by injection molding, a cap body 210 made of injection molding, a compression molding using a high- Or by injecting polypropylene by inserting rubber warp yarns 220, which are manufactured by molding.

In this conventional plug 200, in order to prevent the contents of the fluid from leaking out between the buried rubber when the set of the fluid is removed for reuse after insertion of the set of the fluid, the rubber plug 220 is usually made of elastic isoprene It is made of isoprene rubber (IR). At this time, the isoprene rubber can not pass the rubber stopper test method for the liquid medicine due to its toxicity due to the characteristics of the material. Therefore, the isoprene rubber is heat treated with high temperature water to remove harmful components to the human body, It is common to use a film 230 of a polypropylene having a stabilized crystal as a packaging material for a liquid.

On the other hand, isobutyl isoprene rubber (IIR) which is harmless to human body can also be used as a material for medical rubber. However, since the isobutylisoprene rubber is insufficient in elasticity, when the rubber sheet 220 made of isobutylisoprene rubber is used in the cap 200 for the small liquid bottle 100, the liquid set is inserted once before the rubber It is difficult to remove it and reuse it.

The small liquid bottle cap 200 is adhered to the end portion 120 of the polypropylene liquid bottle 100 by thermal bonding or the like so that the end portion 240 of the cap body 210 made of polypropylene is adhered.

The bottle 100 with the plug thus manufactured is used in such a manner that the set of the liquid is inserted through the entire rubber portion.

Referring to Figs. 2A to 2C, a description will be made of a liquid bag and a cap for a sealing port of a prior art liquid bag. FIG. 2B is a cross-sectional view taken along the line BB of FIG. 2A of a plug for a sealing port of a conventional liquid bag; FIG. 2C is a cross-sectional view taken along line AA of FIG. 2B; FIG. 2A is a perspective view showing a plug for a sealing port of a conventional liquid bag; Fig.

The liquid bag 300 is a plastic bag for storing a liquid such as saline, a nutrient, glucose, and the like, and is kept isolated from the outside. Two sealing ports 310 are mounted on the bottom of the liquid bag, The stopper 400 is coupled.

The closure 400 according to the related art is manufactured by assembling the rubber cap 420 made by injection molding with a polypropylene cap 410 manufactured by injection molding, injection molding by a compression molding by a high-temperature-high-pressure press or by a rubber injection machine, Into which polypropylene is injected.

The rubber core 420 may be made of an isoprene rubber or an isobutyl isoprene rubber. When the rubber sheet 420 is made of isoprene rubber, it is thermally treated with hot water to remove harmful components to the human body, or a film made of polypropylene which is harmless to the human body on the surface of the rubber sheet before contact with the liquid Is used to coat. Also, the rubber can 420 may be made of isobutylisoprene rubber. In this case, since the elasticity of the rubber is insufficient, it is difficult to reuse after the insert is inserted once before the rubber is removed.

An undercut 430 is formed in the polypropylene cap 410 of the cap 400 of the prior art so that the cap 400 is physically coupled to the protrusion 330 formed at the end of the sealing port 310, Is attached to the sealing port (310) of the bag (300).

The liquid bag 300 with the cap 400 for the liquid bag in the prior art inserts a liquid set or the like into the rubber cap 420 attached to the center of one sealing port to administer the liquid to the human body, A rubber needle 420 mounted at the center of the sealing port is inserted with a needle filled with a chemical liquid, and the chemical liquid is introduced into the liquid bag for mixing.

Referring to Figures 3a-3d, an injection vial and a prior art injection vial cap are described. FIG. 3A is a perspective view showing an injection vial and a prior art injection vial cap, FIG. 3B is a sectional view in the CC line direction of FIG. 3A of the injection vial and a prior art injection bottle cap, FIG. And Fig. 3d is a sectional view in which the rubber cap and the aluminum cap are mounted.

A small volume (e.g., 5-20 mL) injection vial 500 is made of plastic such as glass or a cyclic olefin copolymer. After injecting the injector into the vial 500, the rubber cover 620 is attached to the vial opening, and the aluminum cap 610 assembled with the plastic cover 630 is covered with the rubber cover 620. Thereafter, The cap 600 is attached.

This rubber batten 620 may also be made of isoprene rubber or isobutyl isoprene rubber. In the case of isoprene rubber, it is heat treated with hot water to remove harmful components to the human body, A harmless polypropylene film (not shown in the figure) is coated and used.

The injector vial 500 with the injector vial cap 600 of the prior art first removes the plastic lid 630 and inserts the aluminum cap 610 and rubber ampule 620 into the vial The needle is inserted and penetrated before the rubber, and the injection is injected into the syringe.

Incidentally, all of the above-described conventional medical stoppers have a disadvantage in that the number of parts is large and the manufacturing process is complicated and the manufacturing cost is high. In addition, when the liquid set or the injection needle is inserted before the rubber during use, the bonding force between the stopper parts is weak and the rubber transfer is detached, or a gap is formed between the stopper parts and air is introduced into the liquid bottle, There may be a problem.

In order to solve the problem of this prior art medical stopper, according to one embodiment of the present invention, there is provided a medical integrated stopper in which a plastic film is coated before rubber.

4A and 4B, a bottle for a sap bottle and a cap for a sap bottle according to an embodiment of the present invention will be described. FIG. 1A is a perspective view showing a sap bottle and a cap for a sap bottle according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view of the sap bottle and a cap according to an embodiment of the present invention in FIG.

Saline bottles containing liquids such as saline, nutrients, and glucose that are kept sealed from the outside can be made of glass or plastic. For example, a small (e.g., 100 ml capacity) bottle 100 'may be made of a plastic such as polypropylene, high density polyethylene, and a cyclic olefin copolymer. Particularly, the small liquid bottle 100 'is preferably made of polypropylene or high-density polyethylene in terms of cost.

In the case of such a plastic sap bottle, a cap 700 according to an embodiment of the present invention may be attached.

The cap 700 according to one embodiment of the present invention is formed by coating the rubber film 720 with a plastic film 730.

The rubber skeleton 720 may be made of a rubber selected from the group consisting of isoprene rubber, isobutylisoprene rubber, and thermoplastic elastomer. Preferably, rubber warp 720 may be made of isoprene rubber.

The isoprene rubber is an elastic rubber obtained by polymerizing isoprene using a Ziegler catalyst or an alkyl lithium catalyst. The molecular structure of the main component is cis-1,4-polyisoprene such as natural rubber, The content of 1,4-polyisoprene is somewhat small.

The isoprene rubber that can be used in the production of the rubber bat 720 of the plug 700 according to one embodiment of the present invention is not particularly limited, but it is preferred that it has properties of high elasticity and low oxygen permeability (long-term storage) . Examples of commercially available isoprene rubbers include, but are not limited to, IR2200 from Zeon.

The isobutylisoprene rubber is also a synthetic rubber produced by copolymerizing isobutylene with a small amount of isoprene in the presence of a Friedel-Crafts catalyst such as aluminum chloride and an extremely small amount of water, and is characterized by low gas permeability .

The isobutylisoprene rubber which can be used in the production of the rubber bat 720 of the plug 700 according to an embodiment of the present invention is not particularly limited, but it is preferable that it has a characteristic of low oxygen permeability (long-term storage capability). Examples of commercially available isobutylisoprene rubbers include, but are not limited to, Chlorobutyl 1066 from ExxonMobil.

Further, the thermoplastic elastomer has a structure in which a hard polymer material and a soft polymer material are combined, and exhibits elasticity at room temperature, and can be molded like thermoplastics at a high temperature. Unlike ordinary rubbers, a thermoplastic elastomer does not require a vulcanizing agent or a vulcanization accelerator. Therefore, the kneading process is simple, and molding processing can be performed like ordinary thermoplastic plastics.

Examples of the thermoplastic elastomer that can be used in the production of the rubber sheet 720 of the plug 700 according to an embodiment of the present invention include styrene-ethylene-butylene-styrene block copolymer but are not limited thereto.

On the other hand, the plastic film 730 is a film made of the same material as the liquid bottle 100 '. That is, if the infusion bottle 100 'is made of polypropylene, the plastic film 730 is preferably a polypropylene film, and if the infusion bottle 100' is made of high-density polyethylene, the plastic film 730 has a high density Polyethylene film is suitable.

Polypropylene or high-density polyethylene, which is a raw material of the plastic film 730, is not particularly limited as long as it is harmless to the human body. However, FDA approved products or films produced in a clean room are preferable, and heat or ultrasonic welding Strength must be maintained.

The thickness of the plastic film 730 constituting the cap 700 for the liquid bottle 100 'of the present invention is preferably in the range of 100 to 200 μm. When the thickness is within this range, the adhesive strength is sufficient when heat or ultrasonic welding is performed, and resistance is not excessively large when a liquid set or a needle is inserted.

An example of a commercially available polypropylene film is, but is not limited to, CPR-HS from Phil Max.

The plastic film 730 prevents direct contact with the rubber transfer liquid, and is fusion-bonded to the plastic liquid bottle by heat or ultrasonic waves, so that the cap 700 is attached to the liquid bottle. Particularly, when rubber transfer of isoprene rubber material is used, due to toxicity due to the nature of the material, it is impossible to pass the rubber stopper test method for liquid medicine of the Korean Pharmacopoeia. In the case where the plastic film 730 which is confirmed to be stable is a rubber transfer of liquid and isoprene rubber Prevent direct contact. Further, when stability is further required, it is possible to heat the rubber sheet made of isoprene rubber with hot water to remove harmful components to the human body.

In order to prevent foreign matter from being caught on the plug when storing, transporting or handling the vial 100 'with the cap 700 according to an embodiment of the present invention, a release film Not shown in the drawing) may be attached.

The cap 700 according to one embodiment of the present invention can be manufactured by putting a plastic film on a rubber sheet and compression molding. There is no particular limitation on the compression molding method, and a known compression molding method can be used as it is or by appropriately modifying it.

The cap 700 according to an embodiment of the present invention is thermally or ultrasonic welded to the end portion 120 'of the infusion bottle 100' of the same plastic material at the lower end of the plastic film 730.

A sap bottle 100 'with a cap 700 according to an embodiment of the present invention is used in such a manner that a set of sap is inserted through a rubber stopper.

5A to 5C, a cap for a sealing port of a liquid bag according to an embodiment of the liquid bag and the present invention will be described. FIG. 5A is a perspective view showing a plug for a sealing port of a liquid-immersion bag according to an embodiment of the present invention, FIG. 5B is a perspective view of a liquid-storing bag according to an embodiment of the present invention, And Fig. 5C is an enlarged cross-sectional view of the portion (b) of Fig. 5B.

The liquid bag 300 'is a plastic bag in which a liquid such as saline, a nutrient, glucose, etc. is put and kept in an isolated state from the outside. Two sealing ports 310' are attached to the bottom of the liquid bag. Typically, the fluid bag itself may be made of a plastic that is non-toxic, such as polypropylene, and can withstand sterile conditions (121 DEG C, 60 minutes), and the sealing port 310'is made of polypropylene, high density polyethylene and cycloolefin copolymer , ≪ / RTI > Particularly, the sealing port 310 'is preferably made of polypropylene or high-density polyethylene in terms of cost.

A cap 700 according to an embodiment of the present invention may be attached to the sealing port 310 'of the liquid bag 300'.

The plug 800 according to one embodiment of the present invention is formed in such a manner that the rubber film 820 is coated with a plastic film 830.

The rubber brush 820 may be made of a rubber selected from the group consisting of isoprene rubber, isobutylisoprene rubber, and thermoplastic elastomer. Preferably, rubber warp 820 may be made of isoprene rubber.

The specific contents of the isoprene rubber, isobutylisoprene rubber, and thermoplastic elastomer that can be used to produce the rubber brush 820 of the stopper 800 according to one embodiment of the present invention are described in detail with reference to a bottle cap Is the same as in the case of the rubber sheet 720 of the first embodiment.

On the other hand, the plastic film 830 is a film made of the same material as the sealing port 310 'of the liquid bag 300. That is, if the sealing port 300 'is made of polypropylene, if the plastic film 830 is a polypropylene film and the sealing port 300' is made of high-density polyethylene, then the plastic film 830 has a high density Polyethylene film is suitable.

The concrete contents of the plastic film 830 constituting the cap 800 according to the embodiment of the present invention are the same as those of the plastic film 730 of the cap 96 for a liquid bottle according to one embodiment of the present invention.

The cap 800 according to one embodiment of the present invention can be manufactured by placing a plastic film on a rubber sheet and compression molding.

The stopper 800 according to an embodiment of the present invention is formed such that the plastic film 830 at the lower end is fused to the end 320 'of the plastic sealing port 310' of the liquid bag 300 ' .

The liquid bag 300 'with the cap 800 for the liquid bag port of the present invention inserts a liquid set or the like into the rubber container 820 attached to the center of one sealing port, The injection needle filled with a chemical solution is inserted into the rubber container 820 mounted at the center of the sealing port of the sealing port, and the chemical solution is introduced into the bag.

6A to 6C, an injection vial and an injection vial cap according to an embodiment of the present invention will be described. FIG. 6A is a perspective view showing an injection vial and an injection vial cap according to an embodiment of the present invention, FIG. 6B is a perspective view of the injection vial and an injection vial cap according to an embodiment of the present invention, And Fig. 6C is an enlarged sectional view of a portion (c) of Fig. 6B.

Vials containing injections and kept in isolation from the outside may be made of glass or plastic. For example, vials 500 'of small volume (eg, 5 to 20 ml) may be made of plastic such as polypropylene, high density polyethylene, and cycloolefin copolymers. Particularly, the small volume vial 500 'has transparency and is capable of inspecting the presence of a foreign substance in the chemical liquid, and has a higher impact strength than glass, so that the probability of breakage is low. In addition, It is preferable that it is made of a cycloolefin copolymer which can ensure safety in use.

In the case of such plastic vials, a cap 900 according to one embodiment of the present invention may be attached.

The closure 900 according to one embodiment of the present invention has a rubber film 920 coated with a plastic film 930.

The rubber yarn 920 may be made from a rubber selected from the group consisting of isoprene rubber, isobutylisoprene rubber, and thermoplastic elastomer. Preferably, the rubber former 920 may be made of isobutylisoprene rubber.

The specific contents of the isoprene rubber, isobutylisoprene rubber and thermoplastic elastomer which can be used to produce the rubber batten 920 of the plug 900 according to one embodiment of the present invention are described in detail with reference to a bottle cap Is the same as in the case of the rubber sheet 720 of the first embodiment.

On the other hand, the plastic film 930 is a film made of the same material as the vial 500 '. That is, in the case of a vial 500 'made from a cycloolefin copolymer, a film made from a cycloolefin copolymer is suitable.

The cycloolefin copolymer used as the raw material of the plastic film 730 is not particularly limited as long as it is harmless to human body. However, FDA approved product or a film produced in a clean room is preferable, and heat or ultrasonic fusion strength at sterilization condition (121 캜 for 60 minutes) Should be maintained.

It is preferable that the thickness of the plastic film 930 constituting the plug 900 for the injection vial 500 'in the present invention is in the range of 100 to 200 μm.

Examples of commercially available cycloolefin copolymer films include, but are not limited to, Zeonor Films from Zeon.

A release film (not shown) is formed on the surface of the stopper 900 in order to prevent the stopper 900 from being buried in the foreign matter stopper when storing, conveying or handling the injection vial 500 ' Not shown in the drawing) may be attached.

The closure 900 according to one embodiment of the present invention can be manufactured by putting a plastic film on a rubber sheet and compression molding. There is no particular limitation on the compression molding method, and a known compression molding method can be used as it is or by appropriately modifying it.

The closure 900 according to an embodiment of the present invention may be manufactured such that the plastic film 930 of the cycloolefin copolymer material at the lower end is thermally or ultrasonically applied to the end portion 520 'of the injector vial 500' Respectively.

The vial 500 'with the injector vial cap 900 of the present invention is used in such a manner that the injection needle is inserted into the rubber gun 920 and inserted into the rubber gun 920 to inject the injection liquid into the injector.

100, 100 ': fluid bottle
120, 120 ', 320', 520 ': end
200, 400, 600: Prior art plug
210:
220, 420, 620: rubber front
230: Polypropylene film
240: end of the cap body
300, 300 ': sap bag
310, 310 ': sealing port
330:
410: Polypropylene cap
430: undercut
500, 500 ': injection vial
610: Aluminum cap
630: Plastic lid
700, 800, 900: a cap according to an embodiment of the present invention
720, 820, 920: Rubber I
730, 830, 930: plastic film

Claims (9)

A bottle cap for a plastic bottle, characterized in that the plastic film is coated before the rubber, and the plastic film is fused to the end of the bottle by heat or ultrasonic waves. The plastic film of claim 1, wherein the plastic film is made of a rubber selected from the group consisting of isoprene rubber, isobutylene isobutylene rubber and thermoplastic elastomer, and the plastic film is selected from the group consisting of polypropylene, high density polyethylene and cycloolefin copolymer Wherein the medical device is manufactured from a medical device. The integrated medical stopper according to claim 2, wherein the rubber transition is made of isoprene rubber and the infusion bottle and the plastic film are made of polypropylene or high density polyethylene. A stopper for a sealing port made of a plastic bag in which a plastic film is coated before the rubber, and the plastic film is fusion bonded to the end of the liquid bag sealing port by heat or ultrasonic waves. 5. A composition according to claim 4, wherein the plastic film is made of a rubber selected from the group consisting of a rubber transition isoprene rubber, an isobutylisoprene rubber and a thermoplastic elastomer, and the plastic film is a plastic selected from the group consisting of polypropylene, high density polyethylene and cycloolefin copolymer Wherein the medical device is manufactured from a medical device. The medical integrated stopper according to claim 5, wherein the rubber transition is made of isoprene rubber and the sealing port of the liquid bag and the plastic film are made of polypropylene or high density polyethylene. Characterized in that the plastic film is coated with a plastic film before the rubber, and the plastic film is fused to the end of the injection vial by heat or ultrasonic waves. The composition according to claim 7, wherein the plastic film is made of a rubber selected from the group consisting of a rubber transition isoprene rubber, an isobutylisoprene rubber and a thermoplastic elastomer, and the plastic film is a plastic selected from the group consisting of polypropylene, high density polyethylene and cycloolefin copolymer Wherein the medical device is manufactured from a medical device. The medical integrated stopper according to claim 8, wherein the rubber transition is made of isobutyl isoprene rubber, and the injection vial and the plastic film are made of a cycloolefin copolymer.

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