KR100672775B1 - Coating material for entry sheet, method of manufacturing a coating material for entry sheet and entry sheet - Google Patents

Abstract

Provided are a coating material for entry sheets, which has good compatibility with a water-soluble lubricant and is directly spreadable on a thin metal film without using a primer, and a manufacturing method thereof. The coating material for entry sheets comprises 30-90wt% of a water-soluble copolyester resin having a number average molecular weight of 10,000-80,000 and containing sulfonic acid groups, 5-30wt% of a first water-soluble lubricant having a number average molecular weight of 3,000-40,000 and having an acid at the terminal group, and 5-40wt% of a second water-soluble lubricant having a molecular weight of 600-1000 and including ether groups.

Description

Coated material for entry sheet, method of manufacturing a coating material for entry sheet and entry sheet

1 is a cross-sectional view schematically showing the lubricity sheet of the present invention.

Fig. 2 is a view showing variation of scattering of holes formed in a printed circuit board to which the lubricity sheet of the embodiment is applied.

3 is a view showing variation of scattering of holes formed in a printed circuit board to which the lubricity sheet of the comparative example is applied.

<Explanation of symbols for the main parts of the drawings>

100: metal thin film 110: coating film

The present invention relates to a coating material for a lubricity sheet, a method for manufacturing the same, and a lubricity sheet, and more particularly, to a coating material for a lubricity sheet applied when forming a perforation in a printed circuit board using a drill bit, and It relates to a manufacturing method and a lubricity sheet comprising the same.

Printed Circuit Board (PCB) is formed on the surface of the circuit wiring connecting the respective chips in order to mount a variety of chips in a laminate made of phenol resin or epoxy resin. The printed circuit board is classified into a single-sided printed circuit board, a double-sided printed circuit board, a multilayer printed circuit board, and the like according to the number of surfaces on which the circuit wiring is formed.

In the process of manufacturing the printed circuit board, in order to mount chips electrically connected to the circuit wiring on the printed circuit board, an opening is formed in the printed circuit board and then conductive on the inner surface of the substrate exposed by the opening. The material must be coated. Thus, the process of forming an opening in the said printed circuit board is called a drilling process.

Drilling methods for forming openings in the printed circuit board are disclosed in US Patent Nos. 4,781495 and 4,929,370. According to the drilling method disclosed in the patent, a lubricant sheet is formed on the printed circuit board, and then an opening is formed in the printed circuit board using a drill. In this case, the applied lubricant sheet is formed by impregnating the porous sheet with a lubricant comprising a synthetic wax and a nonionic surfactant composed of glycols and fatty acids such as diethylene glycol and dipropylene glycol.

However, the lubricant sheet not only lacks the property of generating heat generated by the drill bit, but also it is difficult to impregnate the porous sheet with the lubricant. In addition, since the lubricant sheet has adhesiveness, handling of the lubricant sheet is difficult.

In order to solve this problem, a drilling method using a lubricity sheet coated with a mixture of polyethylene glycol or polyester and a water soluble lubricant has been proposed. However, the mixture not only has a problem of being adsorbed around the opening formed in the drill bit, but also causes a problem of uneven distribution of holes formed in the printed circuit board.

In addition, the mixture is formed after coating a primer on the entry sheet because it is difficult to coat directly on the entry sheet due to the maximization of lubricant. Since the primer is not water soluble, there is a problem of remaining in the form of particles around the hole formed in the printed circuit board after the cleaning process using water.

In addition, the mixture causes a problem in that the existing product is cracked due to the inadvertent bending of the sheet due to the operator's carelessness, resulting in a decrease in the merchandise or function of the product or a crack due to long-term neglect.

The first object of the present invention devised to solve the above problems is to provide a coating material for entry sheets that can be coated directly on a thin metal film without the application of a primer as well as excellent compatibility with water-soluble lubricants.

The second object of the present invention is to provide a method for producing the coating material for the lubricity sheet.

The third object of the present invention is to provide a lubricity sheet to which the coating material for the lubricity sheet is applied.

Coating material for a lubricity sheet according to an embodiment of the present invention for achieving the first object described above has a number average molecular weight of 10,000 to 80,000, 30 to 90% by weight of a water-soluble copolyester resin containing a sulfonic acid group and the number average molecular weight 5 to 30% by weight of a polyether ester first water-soluble lubricant containing 3,000 to 40,000, an ether group having an acid group at the terminal group, and an ester group together with a molecular weight of 600 to 1000, and a second water-soluble lubricant containing an ether group 5 to 40 It has a composition comprising the weight percent. The coating material for the lubricity sheet having such a composition is not only excellent in lubricity but also has a property that can be easily dissolved in a washing process using water.

The water-soluble copolyester resin of the coating material for the lubricity sheet transesterifies and condenses the carboxylic acid, the difunctional sulfonic acid and the diol including the aliphatic dicarboxylic acid, aromatic dicarboxylic acid or a mixture thereof. It is formed by polymerizing. In addition, the first water-soluble lubricant is formed by transesterification and condensation polymerization of polyethylene glycol, adipic acid, dimethyl terephthalate or a mixture thereof.

In addition, the method for producing a coating material for a lubricity sheet according to an embodiment of the present invention for achieving the above-described second object is a carboxylic acid containing aliphatic dicarboxylic acid, aromatic dicarboxylic acid or a mixture thereof , Bifunctional sulfonic acid and polyhydric alcohol are first reacted to form a water-soluble copolyester resin having a number average molecular weight of 10,000 to 80,000 and comprising sulfonic acid groups. The second reaction of polyethylene glycol with adipic acid, dimethyl terephthalate or a mixture thereof to form a polyether ester first water-soluble lubricant having a number average molecular weight of 3,000 to 40,000 and comprising an ether group and an ester group together with an end group with an acid. do. A second water soluble lubricant having a molecular weight of 600 to 1000 and comprising an ether group is provided. 30 to 90% by weight of the water-soluble copolyester resin, 5 to 30% by weight of the first water-soluble lubricant, and 5 to 40% by weight of the second water-soluble lubricant are mixed and reacted. The result is a coating material for the lubricity sheet.

In particular, the first reaction to form the water-soluble copolyester resin comprises a first ester of carboxylic acid, difunctional sulfonic acid and diol comprising the aliphatic dicarboxylic acid, aromatic dicarboxylic acid or mixtures thereof. Reacting and subjecting the product produced by the first ester reaction to a first condensation polymerization reaction.

In addition, a second reaction for forming the first water-soluble lubricant is a second ester reaction of adipic acid, dimethyl terephthalate or a mixture thereof to polyethylene glycol having a molecular weight of 600 to 4000 and the second ester reaction Subjecting the resultant product to a second polycondensation reaction.

In addition, the lubricity sheet according to an embodiment of the present invention for achieving the above-described third object includes a metal thin film and a lubricity coating film. The lubricity coating film is formed by coating a coating material for a lubricity sheet on the metal thin film. The coating material for the lubricity sheet applied herein has a number average molecular weight of 10,000 to 80,000, the first water-soluble copolyester resin containing sulfonic acid group 30 to 90% by weight and the number average molecular weight of 3,000 to 40,000, the first group having an acid in the terminal group 5 to 30% by weight of the water-soluble lubricant and 600 to 1000 of the molecular weight, and 5 to 40% by weight of the second water-soluble lubricant containing an ether group.

The lubricity sheet including the coating film formed of the above-described coating material is applied in the process of forming an opening in the printed circuit board by using a drill to increase the precision of the formation position of the hole formed in the lubricity sheet, as well as damage to the drill. Can be minimized.

Hereinafter, a coating material for a lubricity sheet, a manufacturing method thereof, and a lubricity sheet including the same according to preferred embodiments of the present invention will be described in detail in the following examples. However, the present invention is not limited to the following examples, and those skilled in the art may implement the present invention in various other forms without departing from the technical spirit of the present invention.

Coating material for lubricity sheet

The coating material for the lubricity sheet according to the present invention has a composition comprising a water-soluble copolyester resin, a first water soluble lubricant having an acid at the end group and a second water soluble lubricant comprising an ether group.

In particular, the coating material for the lubricity sheet has a number average molecular weight of 10,000 to 80,000, 30 to 90% by weight of a water-soluble aromatic / aliphatic copolyester resin containing a sulfonic acid group and a number average molecular weight of 3,000 to 40,000, the terminal group is acid It has a composition comprising 5 to 30% by weight of the substituted first water-soluble lubricant and 5 to 40% by weight of a molecular weight of 600 to 1000, and a second water-soluble lubricant containing an ether group. The coating material having the above-described composition is used to form a lubricating coating film of the lubricity sheet which is applied in the drilling process of forming a hole in the printed circuit board.

The aromatic / aliphatic copolyester resin constituting the coating material for the lubricity sheet of the present invention is a carboxylic acid, a difunctional sulfonic acid and a polyhydric alcohol including an aliphatic dicarboxylic acid, an aromatic dicarboxylic acid or a mixture thereof. After transesterification the product is formed by axial polymerization.

In particular, the aromatic / aliphatic copolyester resin can control various physical properties such as melting point, glass transition temperature, flexibility and transparency by controlling the content of aromatic dicarboxylic acid and aliphatic dicarboxylic acid has a wide application range .

In addition, the aromatic / aliphatic copolyester resins are similar in general to the widely used ether-based water-soluble lubricants in their molecular formulas, and may result in inter reactions or intra reactions upon blending. Therefore, it can be applied to the coating material for the lubricity sheet can form a coating material that is excellent and can control a variety of physical properties.

Unlike the low molecular weight aromatic / aliphatic copolyester resins which are generally used in this embodiment, the aromatic / aliphatic copolyester resins mentioned in the present embodiment not only have water-soluble properties due to the introduction of sulfonic acid groups, but also have a number average molecular weight of 10,000 or more. It has physical properties which are easy to form the coating film for lubricity sheets. The water-soluble aromatic / aliphatic copolyester resin having such physical properties is applied not only to its compatibility with water-soluble lubricants, but also to forming an active coating film of a lubricity sheet having excellent exothermic effect during drilling and hole-position stability. do. In particular, the number average molecular weight is preferably 30,000 to 60,000.

Examples of the aromatic dicarboxylic acid among the carboxylic acids applied to form the water-soluble aromatic / aliphatic copolyester resin include dimethyl terephthalate, dimethyl isophthalate or mixtures thereof. The aromatic dicarboxylic acid is an element that controls the adhesion, transparency, melting point, glass transition temperature and flexibility of the copolyester resin.

Examples of the aliphatic dicarboxylic acid among the carboxylic acids include succinic acid, adipic acid, sebacic acid, dimethyl adipate, and dimethyl succinate. These may be used alone or in combination of one or two or more. The aliphatic dicarboxylic acid, like the aromatic dicarboxylic acid, is an element that controls the adhesion, transparency, melting point, glass transition temperature and flexibility of the coating material.

In particular, it is preferable to use dimethyl adipate, or a mixture of dimethyl adipate and dimethyl succinate, as an example of the aliphatic dicarboxylic acid applied in this embodiment. This is because the succinic acid, adipic acid, sebacic acid, etc. are dika and dicarboxylic acid ester esterification reaction such as dimethyl terephthalate and dimethyl isophthalate and sodium sulfodimethyl isophthalate is produced because the ester reaction is produced Due to the difference in reactivity with the carboxylate, the recarboxyl group is not isotically bonded to each other and randomly bonded to the co-polymerized dicarboxyl group to obtain excellent physical properties. Hard to get

Examples of the aromatic difunctional sulfonic acid applied to form the water-soluble aromatic / aliphatic copolyester resin include 5-sodium sulfodimethylisophthalate, 4-sodium sulfodimethylisophthalate, 5-sodium sulfodimethyl terephthalate, and These metal salts are mentioned. These can be used individually or in mixture of 2 or more.

Examples of the diols used to form the water-soluble aromatic / aliphatic copolyester resins include ethylene glycol, diethylene glycol, neopentyl glycol and the like. These may be used alone or in combination of two or more thereof.

The first water-soluble lubricant included in the coating material for the lubricity sheet prevents migration of the second water-soluble lubricant and serves to bind the aromatic / aliphatic copolyester resin and the second water-soluble. That is, the first water-soluble lubricant improves the compatibility of the aromatic / aliphatic copolyester resin and the second water-soluble lubricant to allow the addition of a second water-soluble lubricant in the coating material for the lubricity sheet.

In the coating material for the lubricity sheet, the first water-soluble lubricant has a structure in which the terminal group is substituted with an acid, and a number average molecular weight of 3,000 to 40,000 is a lubricant transesterifying polyethylene glycol, adipic acid, dimethyl terephthalate or a mixture thereof. The product is then formed by axial polymerization reaction.

The second water-soluble lubricant constituting the coating material for the lubricity sheet of the present invention has a molecular weight of 600 to 1000, and is a water-soluble lubricant containing an ether group. Examples of the second water-soluble lubricant include polyethylene glycol, polypropylene glycol, polyoxyethylene monostearate, polyoxyethylene monolaurate, polyoxyethylene monolaurate, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, poly Oxy ethylene lauryl ether, poly oxy ethylene dodil ether, poly oxy ethylene nonyl phenyl ether, poly oxy ethylene phenyl ether poly oxy ethylene sorbitan monoester, polyglycerol monostearate and the like. These may be used alone or in combination of two or more.

Manufacturing method of coating material for lubricity sheet

In order to prepare a coating material for a lubricity sheet according to the present invention, first, a carboxylic acid, a bifunctional sulfonic acid and a diol are first reacted to form a water-soluble copolyester resin.

The method for producing the copolyester resin will be described in detail. First, an aromatic difunctional sulfonate and diol corresponding to 4 to 9 mol% of the total acid component are mixed with the carboxylic acid, and then the resultant is transesterified. React. In the transesterification reaction, the reaction molar ratio of carboxylic acid and diol is preferably 1: 1.4 to 2.0, and the reaction temperature is reacted at 170 ° C to 220 ° C, more preferably 190 ° C to 210 ° C.

At the beginning of the esterification exchange reaction, 0.1 to 0.4 wt% catalyst, 0.1 to 0.3 wt% stabilizer and 0.01 to 0.07 wt% colorant are added. Dibutyltin oxide, tetrapropyl titanate, or a mixture thereof is used as the catalyst added at this time, and triphenyl phosphate, trimethyl phosphate, or a mixture thereof is used as the stabilizer. In addition, cobalt acetate is used as the colorant.

In addition, in order to obtain a high molecular weight, a multifunctional group is used at the beginning of the transesterification reaction, but a low molecular weight polyfunctional group such as anhydrous acid has an excellent effect, but may be gelled by using a small amount, thereby causing problems in compatibility and processability. Therefore, a high molecular weight copolyester resin can be obtained by adding the polyfunctional group which has a large molecular weight. When the polyfunctional group is added in an amount of 0.05 to 2.0% by weight but less than 0.05% by weight, the effect is insignificant, and when added in excess of 2.0% by weight, gelation may occur. Therefore, more preferably, using 0.1 to 0.5% can obtain a high molecular weight and prevent gelation. Here, the multifunctional group (MULTI FUNCTIONAL GROUP) is a monomer having a functional group (FUNCTIONAL GROUP) at both ends in order to synthesize the ester and includes three or more functional groups.

Subsequently, a catalyst and a stabilizer are added to the reaction product formed by the esterification exchange followed by the axial polymerization reaction. Examples of the catalyst for promoting the axial polymerization reaction include magnesium acetate, tetrapropyl titanate, zinc acetate, tetrabutyl titanate, dibutyl tin oxide, calcium acetate, tetraisopropyl titanate, antimony acetate and the like. These may be used alone or in combination of one or two or more.

In the present embodiment, when the condensation polymerization temperature is less than 235 ° C., the condensation polymerization reaction time is long. On the other hand, when the condensation polymerization temperature is longer than 250 ° C., the thermal decomposition phenomenon and the molecular weight distribution are widened. Therefore, the axial polymerization is preferably carried out at 235 to 250 ℃. In addition, although the axial polymerization reaction is different depending on the amount of the catalyst and the stabilizer, it is preferable to perform about 100 to 150 minutes.

Examples of the carboxylic acid applied to form the water-soluble aromatic / aliphatic copolyester resin include aliphatic dicarboxylic acids, aromatic dicarboxylic acids, and mixtures thereof. In this embodiment, examples of the aromatic dicarboxylic acid may include dimethyl terephthalate, dimethyl isophthalate, or mixtures thereof. Examples of aliphatic dicarboxylic acids include succinic acid, adipic acid, sebacic acid, dimethyl adipate, and dimethyl stone. And the like.

In addition, examples of the aromatic bifunctional sulfonic acid in the present embodiment include 5-sodium sulfodimethylisophthalate, 4-sodium sulfodimethylisophthalate, 5-sodium sulfodimethyl terephthalate, and metal salts thereof. Examples of the diol include ethylene glycol, diethylene glycol, neopentyl glycol and the like.

Polyethylene glycol and adipic acid, dimethyl terephthalate or a mixture thereof are included in the coating material for the lubricity sheet for a second reaction to prepare a first water-soluble lubricant.

Specifically describing the method for producing the first water-soluble lubricant, the first water-soluble lubricant is a polyether ester resin having a number average molecular weight of about 10,000 in which the terminal group is substituted with an acid. The polyether ester resin is prepared by synthesizing polyethylene glycol and adipic acid or dimethyl terephthalate. In this case, in order to have the end group of the polyether ester has an acid, it is formed by reacting adipic acid or dimethyl terephthalate with polyethylene glycol at a molar ratio of about 1: 1.05.

Specifically, adipic acid and dimethyl terephthalate or a mixture thereof are transesterified with polyethylene glycol having a molecular weight of 600, 1000, 2000 or 4000. In the transesterification reaction, 0.2 to 1.0% by weight of catalyst (where based on), 0.1 to 0.5% by weight of stabilizer and 0.01 to 0.07% by weight of colorant may be added. The catalysts, stabilizers, and colorants used are the same as those used in the synthesis of copolyesters, and the polyethylene glycol is large as a polyfunctional group, so there is little concern about gelation. Therefore, 0.1 to 2.0% by weight of anhydrous acid having a small molecular weight can be used. .

At this time, the transesterification reaction is carried out for 30 to 60 minutes at 80 to 140 ℃ does not decompose the polyethylene glycol. Subsequently, after the ester reaction, the mixture is further reacted in a low vacuum (4 to 10 torr) for 60 to 90 minutes to prevent the adipic acid and the dimethyl terephthalate from scattering. The resultant is then subjected to axial polymerization under high vacuum (1torr or less) for 120 minutes. As a result, the polyether ester resin having a number average molecular weight of about 3,000 to 40,000 is obtained.

The purpose of using the first water-soluble lubricant is to induce an interaction with the second water-soluble lubricant added as a lubricant to prevent migration of the second water-soluble lubricant in the coating material for the entry sheet, and It is to be able to bind the water-soluble aromatic / aliphatic copolyester resin and the second water-soluble lubricant by inter or intra reaction with the aromatic / aliphatic copolyester resin.

That is, it is difficult to directly add the second water-soluble lubricant which plays the largest role as a lubricant to the water-soluble aromatic / aliphatic copolyester resin. Therefore, by introducing a first water-soluble lubricant having excellent compatibility with the water-soluble aromatic / aliphatic copolyester resin, the second water-soluble lubricant is added to the coating material containing the water-soluble aromatic / aliphatic copolyester resin. The purpose is to make it possible.

A second water-soluble lubricant having an molecular weight of 600 to 1000 and an ether group is included in the coating material for the lubricity sheet.

Examples of the water-soluble lubricants include polyethylene glycol, polypropylene glycol, polyoxyethylene monostearate, polyoxyethylene monolaurate, polyoxyethylene monolaurate, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, and polyoxyethylene Lauryl ether, polyoxy ethylene dodil ether, poly oxy ethylene nonyl phenyl ether, poly oxy ethylene phenyl ether poly oxy ethylene sorbitan monoester, and polyglycerol monostearate. These can be used individually or in mixture of 2 or more.

Next, 30 to 90% by weight of the water-soluble copolyester resin, 5 to 30% by weight of the first water-soluble lubricant, and 5 to 40% by weight of the second water-soluble lubricant are mixed and reacted. As a result, the coating material for forming the coating film for lubricity sheet is completed.

Specifically, the coating material is a water-soluble aromatic / aliphatic copolyester resin containing a polyether ester which is a first water-soluble lubricant having a number average molecular weight of about 3,000 to 10,000 and a second water-soluble lubricant having a molecular weight of about 200 to 1000 containing an ether group. It is formed by reacting in a high vacuum state after mixing reaction. The coating material for the lubricity sheet is not only a simple mixture of components but also an inter or intra reaction occurs to have excellent compatibility.

In this embodiment, the amount of the first water-soluble lubricant and the second water-soluble lubricant added to the water-soluble aromatic / aliphatic copolyester resin may vary depending on the type of the lubricity sheet and the molecular weight of the aromatic / aliphatic copolyester resin.

Specifically, when the molecular weight of the water-soluble aromatic / aliphatic copolyester resin is relatively small, the content of the first water-soluble lubricant and the second water-soluble lubricant can be reduced. On the other hand, when the molecular weight of the water-soluble aromatic / aliphatic copolyester resin included in the coating material for the lubricity sheet is relatively large, the content of the first water-soluble lubricant and the second water-soluble lubricant may be increased.

Lubricity sheet

1 is a configuration diagram schematically showing the lubricity sheet of the present invention.

Referring to FIG. 1, the lubricity sheet of the present invention is used in a drilling process of forming an opening in a printed circuit board using a drill, and is formed by coating a coating material on the metal thin film 100 and the metal thin film 110. It has a laminated structure.

The metal thin film 100 is formed of a metal having excellent thermal conductivity. As an example of the said metal thin film, an aluminum thin film, a copper thin film, etc. are mentioned. It is preferable that the metal thin film 100 of this embodiment is an aluminum thin film. In addition, the metal thin film 100 of the present embodiment has a thickness of about 50 to 150㎛.

The lubricity coating film 110 is formed by coating a coating material for a lubricity sheet on the metal thin film and then drying. The coating material for the lubricity sheet applied herein has a molecular weight of 10,000 to 80,000, 30 to 90% by weight of a water-soluble aromatic / aliphatic copolyester resin containing a sulfonic acid group, a molecular weight of 3,000 to 40,000, and a first group having an acid at the terminal group. It has a composition containing 5-30 weight% of water-soluble lubricants, molecular weight 600-1000, and 5-40 weight% of the 2nd water-soluble lubricant containing an ether group.

Since the coating film has water solubility, it may be completely removed during the cleaning process performed after the drilling process on the printed circuit board (not shown), and thus does not act as a particle (impurity) in the printed circuit board. The coating film 110 of the present embodiment has a thickness of 20 to 400㎛.

In addition, the lubricity sheet including the coating film 110 may allow the opening to be formed in a more accurate position during the drilling process of the printed circuit board. That is, the increase in the accuracy of the opening formed in the printed circuit board and the variation in the dispersion of the opening can be significantly reduced.

Hereinafter, the present invention will be described in more detail with reference to examples of the coating material for the lubricity sheet and an evaluation example of the lubricity sheet coated with the coating material. However, Examples and Evaluation Examples are for illustrating the present invention, and the present invention is not limited to the above Examples and Evaluation Examples, and may be variously modified and changed.

Coating material for lubricity sheet

Example 1

85% by weight of the water-soluble aromatic / aliphatic copolyester resin having a molecular weight of about 8,000, 5% by weight of the first water-soluble lubricant having a molecular weight of about 5000, and 10% by weight of the second water-soluble lubricant having a molecular weight of about 1000 are mixed and reacted. As a result, a coating material for forming a lubricating coating film for the lubricity sheet was obtained.

Example 2

80 wt% of the water-soluble aromatic / aliphatic copolyester resin having a molecular weight of about 10,000, 10 wt% of the first water-soluble lubricant having a molecular weight of about 5000, and 10 wt% of the second water-soluble lubricant having a molecular weight of about 1000 are mixed and reacted. As a result, a coating material for forming a lubricating coating film for the lubricity sheet was obtained.

Example 3

65% by weight of the water-soluble aromatic / aliphatic copolyester resin having a molecular weight of about 20,000, 15% by weight of the first water-soluble lubricant having a molecular weight of about 5000, and 20% by weight of the second water-soluble lubricant having a molecular weight of about 1000 are mixed. As a result, a coating material for forming a lubricating coating film for the lubricity sheet was obtained.

Example 4

55 wt% of the water-soluble aromatic / aliphatic copolyester resin having a molecular weight of about 40,000, 15 wt% of the first water-soluble lubricant having a molecular weight of about 10,000, and 30 wt% of the second water-soluble lubricant having a molecular weight of about 1000 are mixed and reacted. As a result, a coating material for forming a lubricating coating film for the lubricity sheet was obtained.

Example 5

45 wt% of the water-soluble aromatic / aliphatic copolyester resin having a molecular weight of about 60,000, 20 wt% of the first water-soluble lubricant having a molecular weight of about 10,000, and 35 wt% of the second water-soluble lubricant having a molecular weight of about 1000 are mixed and reacted. As a result, a coating material for forming a lubricating coating film for the lubricity sheet was obtained.

Example 6

35 wt% of the water-soluble aromatic / aliphatic copolyester resin having a molecular weight of about 80,000, 25 wt% of the first water-soluble lubricant having a molecular weight of about 10,000, and 40 wt% of the second water-soluble lubricant having a molecular weight of about 1000 are mixed and reacted. As a result, a coating material for forming a lubricating coating film for the lubricity sheet was obtained.

Characterization of Lubricity Sheets

The coating materials obtained in Examples 1, 2, 3, 4, 5, and 6 were coated on the surfaces of aluminum thin films having a thickness of about 100 μm, respectively, to prepare lubricity sheets having a lubricity coating film having a thickness of about 100 μm. . Moreover, as a comparative example, the lubricity sheet (product name Le100) by the Japan MGC company was prepared.

 Thereafter, the lubricity sheets of the Examples and Comparative Examples were placed on the printed circuit boards, and then a drilling process (drill bit diameter: 0.15 mm, 150 k rpm) was performed to form holes in the printed circuit board. Then, the precision of the hole formed in the printed circuit board and whether the coating material of the lubricity sheet remaining. The results are shown in Table 1.

TABLE 1

Lubricity sheet of Example 1 Lubricity sheet of Example 2 Lubricity sheet of Example 3 Lubricity sheet of Example 4 Lubricity sheet of Example 5 Lubricity sheet of Example 6 Lubricity Sheet of Comparative Example Precision Great Great Great Great Great Great usually Particle Residue X X X X X X O

That is, when holes are formed in the printed circuit board using the lubricity sheets of Examples 1 to 6, it can be seen that the scatter (sigma) of the holes formed as shown in FIG. 2 exists within 20 μm. When the lubricity sheet of the comparative example is applied, it can be seen that the dispersion (6 sigma) of the hole formed as shown in FIG. 3 exists at 25 μm.

The lubricity sheet including the coating film formed of the coating material of the present invention as described above may be applied during the process of forming an opening in the printed circuit board by using a drill to increase the precision of the formation position of the hole formed in the lubricity sheet. In addition, damage to the drill can be minimized.

Claims (11)

30 to 90% by weight of a water-soluble copolyester resin having a number average molecular weight of 10,000 to 80,000 and containing sulfonic acid groups; 5 to 30% by weight of a first water-soluble lubricant having a number average molecular weight of 3,000 to 40,000 and having an acid at the terminal group; And  A coating material for a lubricity sheet having a molecular weight of 600 to 1000 and comprising 5 to 40% by weight of a second water-soluble lubricant containing an ether group. The method of claim 1, wherein the water-soluble copolyester resin Lubricity, characterized in that formed by the axial polymerization reaction after the esterification or transesterification of the aliphatic dicarboxylic acid, carboxylic acid containing aromatic dicarboxylic acid or a mixture thereof, difunctional sulfonic acid and diol Coating material for the sheet. The dicarboxylic acid of claim 2, wherein the aromatic dicarboxylic acid comprises dimethyl terephthalate, dimethyl isophthalate, or a mixture thereof, and the aliphatic di carboxylic acid is succinic acid, adipic acid, sebacic acid, dimethyl adipate, di Coating material for a lubricity sheet, characterized in that it comprises at least one selected from the group consisting of methyl succinate. The method of claim 2, wherein the bifunctional sulfonic acid comprises 5-sodium sulfodimethylisophthalate, 4-sodium sulfodimethylisophthalate, 5-sodium sulfodimethyl terephthalate or metal salts thereof, and the polyhydric alcohol Coating material for a lubricity sheet, characterized in that it comprises at least one selected from the group consisting of ethylene glycol, diethylene glycol and neopentyl glycol. The method of claim 1, wherein the first water-soluble lubricant A coating material for a lubricity sheet, which is formed by transesterification and axial polymerization of polyethylene glycol, adipic acid, dimethyl terephthalate or a mixture thereof. The method of claim 1, wherein the second water-soluble lubricant is polyethylene glycol, polypropylene glycol, polyoxy ethylene monostearate, poly oxy ethylene mono oleate, poly oxy ethylene mono laurate, poly oxy ethylene stearyl ether, poly oxy ethylene At least selected from the group consisting of oleyl ether, polyoxy ethylene lauryl ether, polyoxy ethylene dodil ether, poly oxy ethylene nonyl phenyl ether, poly oxy ethylene phenyl ether poly oxy ethylene sorbitan monoester and poly glycerine monostearate Coating material for lubricity sheet, characterized in that it comprises one. A water-soluble copolyol having a number average molecular weight of 10,000 to 80,000 and a first reaction of an aliphatic dicarboxylic acid, a carboxylic acid containing an aromatic dicarboxylic acid or a mixture thereof, a bifunctional sulfonic acid and a diol. Forming an ester resin; Reacting polyethylene glycol with adipic acid, dimethyl terephthalate or a mixture thereof to form a first water-soluble lubricant having a number average molecular weight of 3,000 to 40,000 and an acid at the terminal group; Providing a second water soluble lubricant having a molecular weight of 600 to 1000 and comprising an ether group; And 30 to 90% by weight of the water-soluble copolyester resin, 5 to 30% by weight of the first water-soluble lubricant and 5 to 40% by weight of the second water-soluble lubricant comprising the step of mixing the reaction. The method of claim 7, wherein the first reaction A first ester reaction of said aliphatic dicarboxylic acid, carboxylic acid comprising aromatic dicarboxylic acid or mixtures thereof, difunctional sulfonic acid and polyhydric alcohol; And A first polycondensation reaction of the product produced by the first ester reaction comprising the step of producing a coating material for a lubricity sheet. The method of claim 7, wherein the second reaction A second ester reaction of adipic acid, dimethyl terephthalate or a mixture thereof to polyethylene glycol having a molecular weight of 600 to 4000; And And a second polycondensation reaction of the product produced by the second ester reaction. 8. The method of claim 7, wherein the water soluble copolyester resin and the first water soluble lubricant are magnesium acetate, tetrapropyl titanate, zinc acetate, tetrabutyl titanate, dibutyl tin oxide, calcium acetate, tetraisopropyl titanate and antimony Method for producing a coating material for a lubricity sheet, characterized in that formed using at least one catalyst selected from the group consisting of acetate. Metal thin film; And Is formed on the metal thin film, including a coating film formed of a coating material for lubricity sheet, The coating material for the lubricity sheet has a number average molecular weight of 10,000 to 80,000, a first water-soluble lubricant having 30 to 90% by weight of a water-soluble copolyester resin containing a sulfonic acid group, a number average molecular weight of 3,000 to 40,000, and an acid in the terminal group. A lubricity sheet comprising from 5 to 30% by weight and from 5 to 40% by weight of a molecular weight of 600 to 1000 and a second water-soluble lubricant containing an ether group.

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