KR20130024370A - Opaque pet film for hydrogel with excellent discriminations - Google Patents

Abstract

PURPOSE: An opaque polyethylene terephthalate film is provided to improve releasing separation and sensitivity by an inline coating process. CONSTITUTION: An opaque polyethylene terephthalate film comprises a film(10) containing 5-30 weight% of a titanium mixture, which is a biaxially stretched polyethylene terephthalate film and has an average particle size of 0.1-5 micron, and 0.005-0.5 weight% of a white polyester terephthalate which contains a fluorescent brightener; and a silicon hetero coating layer(20) which is formed on one side of the film and comprises an epoxy compound and a silane compound.

Description

Opaque PET film for hydrogel with excellent discriminations}

The present invention relates to a hydrogel releasing white film having excellent identification as an accessory for medical supplies and medical devices, and more particularly, to a hydrogel applied to one surface of a wound coating material, an adhesive for biological tissue, and a biological electrode. It relates to a release white film used to protect the exposed surface, easy peeling from the medical substrate, easy identification after peeling to prevent secondary injury of medical workers or patients.

Hydrogels as adhesives or adhesives used in medical supplies are antimicrobial agents that protect the skin or skin openings of mammals, remove excess emissions from wounds, protect the moist wound environment, and protect oxygen, water vapor and carbon dioxide. Wound coatings, disposable diagnostic electrocardiogram (ECG) electrodes or transdermal electrodes that allow gas exchange to pass medical supplies, are insulated to maintain wound body temperature, and are impermeable to liquids and microorganisms to minimize contamination and infection It can be used as a biological electrode such as a nerve stimulation (TENS) electrode. In particular, the electrode is placed on a release film and the biocompatible pressure sensitive adhesive hydrogel is laminated and die cut as necessary. The pressure-sensitive adhesive hydrogel should be suitable for contact with the skin of the patient upon removal of the protective film.

Thus, the pressure-sensitive adhesive hydrogel, which must come into contact with the patient's body tissues or body fluids, is protected, should be easily peeled off during use, the material remaining on the surface of the pressure-sensitive adhesive hydrogel should be minimized, bacteriostatic and odor free. A variety of substrates have been used as release materials requiring excellent visibility to prevent secondary medical accidents after falling in the vicinity of patients or medical personnel after use in an emergency situation.

However, as a base material which satisfies all the required characteristics of the above protective release base material, there is a limit in providing better functions and characteristics as a conventional polyester film or a release paper.

Polyester film and release paper imparted with a release function on one side are widely used, but due to the characteristics of the material, the visibility of the light is remarkably high due to the high light transmittance, or the transfer rate of silicon is high due to the solvent-based release layer coating. There was a problem that it was not suitable for human contact because it did not obtain FDA certification.

Due to the problems of the conventional materials as described above, there was an urgent need for the development of a polyester film for medical substrates, particularly hydrogel mold release, which is excellent in identification and suitable for human contact.

Accordingly, the present invention has been made to meet the above requirements and to solve the conventional problems, and the main object of the present invention is to provide a hydrogel release polyester film having a stable release coating layer and having excellent discrimination. .

These and other objects and advantages of the present invention will become more apparent from the following description of a preferred embodiment thereof.

Hydrogel release white film excellent in the identification of the present invention for achieving the above object;

White polyester containing 5 to 30% by weight of a titanium mixture having an average particle size of 0.1 to 5 μm, 0.1 to 5% by weight of a silicone compound having an average particle size of 1 to 10 μm, and 0.005 to 0.5% by weight of an optical brightener. It is characterized in that the biaxially stretched polyethylene terephthalate film characterized in that to satisfy the following formulas 1 to 3 by forming an ester terephthalate film, and a silicone release coating layer comprising an epoxy compound and a silane compound on one surface of the film:

20≤RF≤60 ---- Equation 1)

40≤Gloss @ 60 ° ≤80 ---- Equation 2)

0.1≤Rz≤0.3 ---- Equation 3)

In the above formula, "RF" is a release peel force of one surface of the hydrogel release film having excellent identification, and the unit is g / inch, "Gloss ＠ 60 °" is the glossiness of the film (60 °), and "Rz" is The unit is μm in terms of the two-dimensional surface roughness of the film.

According to another configuration of the present invention, the coating composition of the film comprises a coating layer consisting of hexenyl polysiloxane, or vinyl polysiloxane, hydrogen polysiloxane, epoxy compound, silane compound, chelate platinum catalyst, and on one side of the film by in-line coating method It is characterized by being coated.

According to another configuration of the present invention, the thickness of the silicone release coating layer is not more than 1.5㎛, characterized in that there is no material transfer to the contact surface or the opposite surface.

According to another configuration of the present invention, the polyester is characterized in that the intrinsic viscosity is more than 0.5dl / g.

The hydrogel release white film having excellent discrimination of the present invention configured as described above exhibits excellent release peeling force and discrimination through an inline coating process, thus providing a sufficient function as a medical release base material, and an inline aqueous coating method and sequential biaxial stretching. Due to the manufacturing process, it is possible to provide a large amount of products that can be in contact with the body, with uniform physical properties. In addition, by adjusting the gloss and color of the surface, it realizes excellent discrimination, thereby maximizing the performance in the process in the actual use environment, such as preventing secondary medical accidents.

1 is a cross-sectional view of a hydrogel release white film according to a preferred embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in more detail by preferred embodiments.

1 is a cross-sectional view of a hydrogel release white film according to a preferred embodiment of the present invention.

According to a preferred embodiment of the present invention, the hydrogel releasing white film having excellent identification of the present invention has a polyester mixture having an intrinsic viscosity of 0.9 dl / g, 5 to 30 wt% of a titanium mixture having an average particle size of 0.1 to 5 μm, White polyester terephthalate film (10) characterized in that it comprises 0.1 to 5% by weight of a silicon compound having an average particle size of 1 to 10㎛, and 0.005 to 0.5% by weight of a fluorescent brightener, and an epoxy compound on one side of the film. It is a biaxially stretched polyethylene terephthalate film which is inline coated with a silicone release coating layer 20 containing a silane compound and is manufactured to satisfy the following formulas 1, 2, and 3 simultaneously:

20≤RF≤60 ---- Equation 1)

40≤Gloss @ 60 ° ≤80 ---- Equation 2)

0.1≤Rz≤0.3 ---- Equation 3)

In the above formula, "RF" is a release force of one surface of a hydrogel release film having excellent discrimination, and a unit is g / inch, "Gloss ＠ 60 °" is glossiness of the film (60 °), and "Rz" is The unit is μm in terms of the two-dimensional surface roughness of the film.

More preferably, the hydrogel releasing white film having excellent identification is a polyethylene terephthalate film produced by a biaxial stretching method, and a silicone release coating layer containing an epoxy compound and a silane compound is coated on one surface by an inline coating method.

Also preferably, the silicone coating of the hydrogel release white film is coated on one surface of the film base material to prevent secondary medical accidents.

Also preferably, the silicone coating layer of the hydrogel release white film maintains a thickness of 1.5 μm or less, and there is no mass transfer to a contact surface or an opposite surface.

In addition, the hydrogel releasing white film is preferably a thickness of 100㎛ preferably, more preferably the hydrogel releasing white film, in order to express a smooth peel release property with a contact base, both surface roughness It is made into 0.3 micrometer or less.

According to another preferred embodiment of the present invention, since titanium dioxide used in a large amount in the hydrogel release white film lowers the matrix intrinsic viscosity, the intrinsic viscosity of the polyester matrix must be maintained at an appropriate level. If the viscosity is too low, there is a high possibility of breakage during film production, and the crystallization control technology is required because the inorganic particles containing a large amount act as nucleating agent of the polymer melt during the casting process.

Therefore, the average particle size of titanium dioxide used in the preparation of the hydrogel release white film according to the present invention is preferably in the range of 0.05 to 5 μm. When the particle size is less than 0.05 μm, particle aggregation decreases due to particle aggregation. When the particle size exceeds 5 μm, the interaction force between the particles and the particles and between the particles and the matrix is weakened. It is not preferable because it causes instability.

On the other hand, the amount of titanium dioxide to polyester is preferably in the range of 5 to 30% by weight (more preferably 10 to 20% by weight). If the filling amount is less than 5% by weight, the whiteness is low and the hiding power does not reach the required value, and if the filling amount is more than 30% by weight, for example, the swelling phenomenon of the melt is reduced and the sagging of the melt is increased. It is not preferable because the flow characteristics of the polymer are changed, the stretchability is lowered, and the difficulty of the film forming process is caused.

In addition, the average particle size of the silicone compound used in the present invention is preferably in the range of 1 to 10 µm (more preferably, 2 to 5 µm). The amount of silicon dioxide added is preferably in the range of 0.1 to 5% by weight (more preferably 0.5 to 1% by weight). Even if the addition amount of silicon dioxide is large, if the average particle size is less than 1 µm or if the addition amount is less than 0.1% by weight, it is difficult to obtain sufficient quenching and discriminating properties. On the contrary, when a relatively large particle | grain exceeding 10 micrometers is contained in large quantities exceeding 5 weight%, film forming property falls.

The polyethylene terephthalate film used in the present invention is not limited in kind, and known ones known in the art can be used. In the present invention, a description will be given focusing on polyethylene-based resins such as polyethylene, polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate.

The polyethylene terephthalate film which comprises the said film points out the polyethylene obtained by polycondensing aromatic dicarboxylic acid and aliphatic glycol. Examples of the aromatic dicarboxylic acid include terephthalic acid and 2,6-naphthalenedicarboxylic acid. Examples of the aliphatic glycol include ethylene glycol, diethylene glycol, 1,4-cyclohexanedimethanol and the like.

For the silicone release coating layer of the present invention, the organopolysiloxane may be any type such as addition type, condensation type, and ultraviolet curing type, but the representative molecular structure of the present invention is represented by the following Chemical Formula 1.

[Formula 1]

Here m and n are integers greater than or equal to zero.

The organopolysiloxane contains an alkenyl group in a molecule, alkenyl group may be present in any part of the molecule, and at least two or more are preferable. The molecular structure may be linear or branched, or may be a structure in which both linear and branched molecules are present.

In addition, as a curing agent in the composition of the coating composition according to the present invention, any type such as addition type, condensation type, and ultraviolet curing type may be used. Representative molecular structure of organo hydrogen polysiloxane, which is a representative curing agent of the present invention, is as follows. Is the same as in Formula 2.

[Formula 2]

Here, p and q are integers 0 or more.

The organohydrogen polysiloxane may be linear, branched or cyclic, or a mixture thereof. In addition, the viscosity and molecular weight are not limited, but the compatibility with the organopolysiloxane should be good, and the amount of use is such that the hydrogen atom bonded to the silicon atom for one alkenyl group of the organopolysiloxane is in the range of 0.5 to 1.2. desirable. If there are less than 0.5 hydrogen atoms bonded to a silicon atom with respect to one alkenyl group of the organopolysiloxane, there may be a problem that a good hardenability may not be obtained. If the number exceeds 1.2, elasticity or physical properties after curing may be deteriorated. Can be. On the other hand, in the silicone release composition according to the present invention, when the amount of the organohydrogen polysiloxane is higher than that of the organopolysiloxane, crosslinking proceeds a lot, resulting in reduced flexibility and cracking of the film, thereby reducing smoothness.

The film of this invention uses the biaxially stretched polyethylene terephthalate film which has the outstanding release peel force and was excellent in productivity and workability.

Although the thickness of a polyethylene film is not limited in this invention, 50-150 micrometers (micrometer) is preferable, Furthermore, 75-125 micron (micrometer) is the most preferable.

Hereinafter, the present invention will be described in detail using Examples and Comparative Examples. These examples are only presented by way of example only to more specifically describe the present invention, it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples. .

Example 1

Combining particle-free polyethylene terephthalate chip with titanium dioxide and silicon dioxide, a silicon release coating layer is applied on one surface to realize a light peeling performance of 25 g / in., And has a haze of 88%. A biaxially stretched polyethylene terephthalate film having a glossiness of 55 and a surface roughness of about 0.25 μm was prepared.

Example 2

Combining a particle-free polyethylene terephthalate chip with titanium dioxide and silicon dioxide, a silicon release coating layer having a release property of 100 g / in. With a peeling force of 100 g / in. A biaxially stretched polyethylene terephthalate film having a gloss of 230 and a surface roughness of about 2.0 μm was prepared.

Example 3

Combining particle-free polyethylene terephthalate chip with titanium dioxide and silicon dioxide, a silicon release coating layer is applied on one surface to realize light peeling performance of 70 g / in., And the haze is 65%. , A biaxially stretched polyethylene terephthalate film having a gloss of 110 and a surface roughness of about 2.0 μm was prepared.

Comparative Example 1

Nitto Denko's off-line coating release film was used, and its thickness was 100 μm.

Comparative Example 2

Pacothane release film from Pachothane technology was used, and its thickness was 100 μm.

Evaluation of physical properties of the films prepared in Examples 1 to 3 and Comparative Examples 1 to 2 was carried out in the same manner as shown in Table 1 below.

Peel force (g / in.) Residual Adhesion Rate (%) Glossiness (%) Haze (%) Discernment Example 1 25 92 55 88 ◎ Example 2 100 91 230 3 X Example 3 70 90 110 65 △ Comparative Example 1 10 80 200 2.5 X Comparative Example 2 70 80 215 3.5 X

* Classification: ◎ Excellent, △ Normal, X Poor

As can be seen in Table 1, Example 1 using a white polyester terephthalate film for hydrogel release according to the present invention can be seen that it possesses excellent identification and release peeling power together.

In the present specification, only a few examples of various embodiments performed by the present inventors are described, but the technical idea of the present invention is not limited thereto, but may be variously modified and modified by those skilled in the art.

10 --- polyethylene terephthalate film
20 --- Silicone release coating layer

Claims (4)

White polyester containing 5 to 30% by weight of a titanium mixture having an average particle size of 0.1 to 5 μm, 0.1 to 5% by weight of a silicone compound having an average particle size of 1 to 10 μm, and 0.005 to 0.5% by weight of an optical brightener. Discrimination is characterized in that the biaxially stretched polyethylene terephthalate film, characterized in that to satisfy the following formula 1 to 3 by forming a silicone release coating layer containing an epoxy compound and a silane compound on the ester terephthalate film and one surface of the film Excellent hydrogel release white film:
20≤RF≤60 ---- Equation 1)
40≤Gloss @ 60 ° ≤80 ---- Equation 2)
0.1≤Rz≤0.3 ---- Equation 3)
In the above formula, "RF" is a release peel force of one surface of the hydrogel release film having excellent discrimination, and the unit is g / inch, "Gloss ＠ 60 °" is the glossiness of the film (60 °), and "Rz" is The unit is μm in terms of the two-dimensional surface roughness of the film.
The method of claim 1, wherein the coating composition of the film comprises a coating layer consisting of hexenyl polysiloxane, or vinyl polysiloxane, hydrogen polysiloxane, epoxy compound, silane compound, chelate platinum catalyst, and coated on one side of the film by in-line coating method Hydrogel release white film with excellent discrimination, characterized in that.
According to claim 1, wherein the thickness of the silicone release coating layer does not exceed 1.5㎛, hydrogel releasing white film with excellent discrimination, characterized in that there is no material transfer to the contact surface or the opposite surface.
According to claim 1, wherein the polyester is hydrogel releasing white film having excellent discrimination, characterized in that the intrinsic viscosity is more than 0.5dl / g.

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