JP2008162231A - Resin molded article having lubricating surface and its production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin molded article having a lubricating surface capable of generating stably high lubrication under humid conditions and also to provide a method for producing the article. <P>SOLUTION: The resin molded article 1 is composed of a substrate 2 containing a polyolefin or a polyolefin-containing compound, wherein a layer 3 containing a hydrophilic group which is subjected to a surface treatment is formed on the surface of the substrate 2 and a hydrophilic polymer layer 4 having non-insolubilized part is formed as the outer most layer of the resin molded article 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a resin molded product having surface lubricity and a method for producing the same.

  Various methods have been studied as methods for imparting lubricity to the surface of polyolefin or polyolefin-based resin molded products such as polyethylene and polypropylene. Particularly in recent years, a method of forming a hydrogel layer on a hydrophobic polyolefin surface and imparting lubricity when wet has been studied (for example, see Patent Document 1).

In this method, a hydrophilic polymer insolubilized as a lubricating component is applied and mixed with a resin having adhesiveness to polyolefin, or is laminated and adhered to a substrate to impart surface lubricity. .
JP-A-8-24328

  However, in the above conventional method, since the outermost layer is a mixture of a resin having adhesiveness to polyolefin and an insolubilized hydrophilic polymer, lubricity is reduced when the ratio of the hydrophilic polymer decreases. There is a problem that decreases. On the other hand, when forming a hydrophilic polymer insolubilized layer on a resin having adhesion to polyolefin, the resin having adhesion to polyolefin forms a strong bond with the polyolefin substrate. . However, since the resin having adhesiveness to the polyolefin does not form any bond with the insolubilized layer of the hydrophilic polymer, there is a problem in adhesion with the hydrophilic polymer, and the hydrophilic property is high. There is a possibility that the lubricity is drastically reduced due to dropping off of the molecular layer.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a resin molded article having surface lubricity capable of stably expressing high lubricity when wet and a method for producing the same. To do.

The present invention employs the following means in order to solve the above problems.
The resin molded product having surface lubricity according to the present invention is a resin molded product based on polyolefin or a compound containing polyolefin, and is a surface activation treatment layer formed on the surface of the substrate and having a hydrophilic group. And a hydrophilic polymer layer formed as an outermost layer of the resin molded product and having a portion that is not insolubilized.

The surface activation treatment layer having a hydrophilic group in this invention is a surface into which a hydrophilic group such as a hydroxyl group or a carboxyl group has been introduced by some means such as corona discharge treatment or plasma treatment.
Therefore, a surface activation treatment layer having a hydrophilic group is formed on the surface of a base material of a resin molded product made of polyolefin or a polyolefin-containing compound, and a hydrophilic polymer layer is formed thereon. The molecule can be brought into close contact with the surface having a hydrophilic group by forming a strong bond. In addition, since the hydrophilic polymer layer has a portion that is not insolubilized, when moisture is supplied to the surface on which the hydrophilic polymer layer is formed, the portion that is not insolubilized can be gradually dissolved, and the dissolved portion A mixture of water and moisture can act as a lubricant between the mating member.

  The resin molded product having surface lubricity according to the present invention is the resin molded product having surface lubricity, wherein the hydrophilic polymer layer comprises polyvinyl alcohol, polyethylene glycol, polyvinyl pyrrolidone, and methyl vinyl ether. It is characterized by comprising at least one material selected from maleic anhydride copolymers.

  In the present invention, since the hydrophilic polymer material is relatively inexpensive and readily available, and is excellent in lubricity when wet, more suitable surface lubricity can be obtained at a low cost.

  In addition, the resin molded product having surface lubricity according to the present invention is a resin molded product having surface lubricity, and includes a water-retaining gel layer that retains moisture and supplies moisture to the hydrophilic polymer layer. The surface activation treatment layer and the hydrophilic polymer layer are disposed between the surface activation treatment layer and the hydrophilic polymer layer.

  In the present invention, since moisture is supplied from the water-retaining gel layer to the hydrophilic polymer layer even in a dry atmosphere, the hydrophilic polymer layer can be kept wet for a longer period without drying.

  Further, the resin molded product having surface lubricity according to the present invention is the resin molded product having surface lubricity, wherein the water-retaining gel layer comprises polyvinyl alcohol, polylactic acid, polyethylene oxide, cellulose, starch, methyl It is characterized by comprising at least one material selected from vinyl ether-maleic anhydride copolymer, polyvinyl polypyrrolidone, acrylic acid, N-vinyl pyrrolidone, vinyl ether monomer, and maleic anhydride monomer.

  In the present invention, the above material is relatively inexpensive and easily available, and has high water retention and low toxicity. Therefore, more suitable surface lubricity can be obtained at low cost. In particular, the same kind of material as the hydrophilic polymer to be used, for example, when using polyvinyl alcohol as the hydrophilic polymer, a gel layer made of polyvinyl alcohol is used. When using polyethylene glycol as the hydrophilic polymer, a gel made of polyethylene oxide is used. When using polyvinyl pyrrolidone as the hydrophilic polymer, a vinyl pyrrolidone gel layer is used, and when using a methyl vinyl ether-maleic anhydride copolymer as the hydrophilic polymer, the same material or vinyl ether monomer and When each gel layer made of maleic anhydride monomer is used, the affinity between the hydrophilic polymer layer and the water-retaining gel layer is improved, and the adhesion can be further improved.

  Further, the resin molded product having surface lubricity according to the present invention is the resin molded product having surface lubricity, wherein the crosslinking degree of the water-retaining gel layer is higher than the crosslinking degree of the hydrophilic polymer layer. It is large.

  In this invention, by increasing the degree of cross-linking of the water-retaining gel layer, the bonding points between the molecules increase and the state becomes closer to a solid, so that the film strength and water retention of the water-retaining gel layer can be ensured. .

  Further, the resin molded product having surface lubricity according to the present invention is the resin molded product having surface lubricity, wherein the water retention gel layer has a degree of cross-linking from the hydrophilic polymer layer side. It is characterized by increasing continuously or stepwise toward the chemical treatment layer side.

  In the present invention, by increasing the degree of crosslinking of the water-retaining gel layer on the surface activation treatment layer side, the number of bonding points between molecules increases, and it becomes closer to a solid state. The film strength and water retention of the gel layer can be ensured. Furthermore, since the degree of cross-linking of the water-retaining gel layer decreases continuously or stepwise toward the hydrophilic polymer layer, the molecular structure of the water-retaining gel layer should be approximated to the molecular structure of the hydrophilic polymer layer. It is possible to increase the number of bonding points, and to suitably suppress the peeling and dropping of the hydrophilic polymer layer.

  The resin molded product having surface lubricity according to the present invention is the resin molded product having surface lubricity, wherein the water-retaining gel layer is composed of at least three layers having different cross-linking degrees, When the first layer is the layer closest to the hydrophilic polymer layer and the second layer is the layer closest to the surface activation treatment layer, the first layer and the thickness of the first layer and the second layer The thickness of the layer sandwiched between the second layers is larger.

  In general, the water retention gel layer improves the water retention because the supplied water becomes harder to dissipate as the degree of crosslinking increases, but the water retention is reversed because the water supply becomes difficult if the degree of crosslinking becomes too high. To drop. This invention ensures adhesion between the water-retaining gel layer, the hydrophilic polymer layer, and the surface activation treatment layer, and takes a relatively thick layer having a moderate degree of crosslinking and good water retention. Thereby, the water retention of a water retention gel layer can be improved.

  The resin molded product having surface lubricity according to the present invention is a resin molded product having surface lubricity, and the hydrophilic polymer layer and the water-retaining gel layer comprise the same material. It is characterized by that.

  In the present invention, the same material having different degree of crosslinking is used for the water-retaining gel layer and the hydrophilic polymer layer, so that the adhesion between both layers can be improved.

  Further, the resin molded product having surface lubricity according to the present invention is the resin molded product having surface lubricity, wherein the hydrophilic polymer layer and the water-retaining gel layer have the same component as a main component. And the weight ratio of the component in the hydrophilic polymer layer is larger than the weight ratio of the component in the water-retaining gel layer.

  Since this invention uses the same component as a main component for the hydrophilic polymer layer and the water-retaining gel layer, the adhesion between both layers can be improved. Moreover, the lubricity of a hydrophilic polymer layer is securable by raising the weight ratio in the hydrophilic polymer layer of the component which bears lubricity. In the present invention, the “main component” means “a component in which the weight ratio in the material exceeds 50% among the components constituting the material included in the layer”.

  Further, the resin molded product having surface lubricity according to the present invention is the resin molded product having surface lubricity, wherein the weight ratio of the component in the water-retaining gel layer is from the surface activation treatment layer side. It increases continuously or stepwise toward the hydrophilic polymer layer side.

  According to the present invention, the lubricity can be ensured by increasing the weight ratio of the component responsible for lubricity in the portion of the water-retaining gel layer close to the hydrophilic polymer layer. In addition, by reducing the weight ratio of the components toward the surface activation treatment layer continuously or stepwise, it becomes closer to a solid state, so the water retention gel layer on the surface activation treatment layer side The film strength can be improved, and the adhesion between the water retention gel layer and the surface activation treatment layer can be further increased.

  Further, the resin molded product having surface lubricity according to the present invention is the resin molded product having surface lubricity, wherein the hydrophilic polymer layer and the water-retaining gel layer have the same component as a main component. It is characterized by comprising the same material as.

  Since this invention uses the same material which has the same component as a main component in a water retention gel layer and a hydrophilic polymer layer, the adhesiveness of both layers can further be improved. Moreover, the lubricity of a hydrophilic polymer layer is securable by raising the weight ratio in the hydrophilic polymer layer of the component which bears lubricity. Furthermore, in the water retention gel layer, the water retention of the water retention gel layer can be ensured by lowering the weight ratio of the above components and increasing the weight ratio of other components responsible for water retention.

  A method for producing a resin molded product having surface lubricity according to the present invention is a method for producing a resin molded product having a polyolefin or a compound containing polyolefin as a base material, and a surface activation treatment layer is provided on the surface of the base material. It comprises a surface activation treatment step to be formed and a lubricating layer coating step for forming a hydrophilic polymer layer having a portion that has not been insolubilized.

In the present invention, surface activation treatment is performed on the surface of a resin molded article substrate made of polyolefin or a compound containing polyolefin, so that the C—H bond on the surface is cleaved, and a hydroxyl group that is a hydrophilic group from moisture in the atmosphere or the like. Carboxyl groups can be supplied to modify the polyolefin substrate surface to be hydrophilic. Therefore, the surface modified to be hydrophilic can form a strong bond with the coating layer made of the hydrophilic polymer, and the adhesion can be improved.
In addition, since the hydrophilic polymer layer has a portion that is not insolubilized, when moisture is supplied to the surface of the coating layer formed by the hydrophilic polymer formed in the lubricating layer coating process, the portion that has not been insolubilized gradually dissolves. The mixture of the dissolved part and moisture can act as a lubricant between the mating member.

  The method for producing a resin molded product having surface lubricity according to the present invention is a method for producing a resin molded product having surface lubricity, wherein the surface activation treatment step comprises corona discharge treatment, low-pressure mercury lamp or It includes at least one treatment selected from ultraviolet irradiation by an excimer lamp, excimer laser irradiation, plasma irradiation, and ozone treatment.

  According to the present invention, the substrate surface of the resin molded product can be reliably activated by the above treatment.

  The method for producing a resin molded product having surface lubricity according to the present invention is a method for producing a resin molded product having surface lubricity, wherein the hydrophilic polymer layer comprises polyvinyl alcohol, polyethylene glycol, polyvinyl It comprises at least one material selected from pyrrolidone and methyl vinyl ether-maleic anhydride copolymer.

  According to the present invention, since the above material is relatively inexpensive and easy to handle, and also has excellent lubricity when wet, it is possible to easily form a lubricious surface.

  The method for producing a resin molded product having surface lubricity according to the present invention is a method for producing a resin molded product having surface lubricity, which retains moisture and supplies moisture to the hydrophilic polymer layer. A water retention layer coating step of forming a water retention gel layer to be formed between the surface activation treatment layer and the hydrophilic polymer layer is further provided.

  This invention forms a water-retaining gel layer that retains moisture between the surface activation treatment layer and the hydrophilic polymer coating layer, so that the hydrophilic polymer is removed from the water-retaining gel layer even in a dry atmosphere. Moisture can be supplied to the layer, the hydrophilic polymer layer can be prevented from drying, and the wet state can be maintained for a longer period of time.

  The method for producing a resin molded article having surface lubricity according to the present invention is a method for producing a resin molded article having surface lubricity, wherein the water-retaining gel layer comprises polyvinyl alcohol, polylactic acid, polyethylene oxide. , Cellulose, starch, methyl vinyl ether-maleic anhydride copolymer, polyvinyl polypyrrolidone, acrylic acid, N-vinyl pyrrolidone, vinyl ether monomer, maleic anhydride monomer, and at least one material.

  In the present invention, the above material is relatively inexpensive and easily available, and has high water retention and low toxicity. Therefore, the water retention gel layer can be easily formed. In that case, the said material can be selected suitably and all things can be applied for the combination with a hydrophilic polymer layer. In particular, the same kind of material as the hydrophilic polymer, for example, when using polyvinyl alcohol for the hydrophilic polymer, the gel layer made of polyvinyl alcohol is used. When using polyethylene glycol for the hydrophilic polymer, the gel made of polyethylene oxide is used. When using polyvinyl pyrrolidone as the hydrophilic polymer, a vinyl pyrrolidone-based gel layer is used. When using methyl vinyl ether-maleic anhydride copolymer as the hydrophilic polymer, the same material or vinyl ether is used. If gel layers made of a termonomer and a maleic anhydride monomer are respectively used, the affinity between the hydrophilic polymer layer and the water-retaining gel layer can be improved, and the adhesion can be easily improved.

  The method for producing a resin molded article having surface lubricity according to the present invention is a method for producing a resin molded article having surface lubricity, wherein the water retention layer coating step is performed from the hydrophilic polymer layer side. The method includes a step of increasing the degree of crosslinking of the water-retaining gel layer continuously or stepwise to the surface activation treatment layer side.

  This invention increases the degree of cross-linking of the water retentive gel layer on the surface activation treatment layer side in the water retention layer coating step, thereby increasing the number of bonding points between the molecules, resulting in a more solid state. The film strength and water retention of the water-retaining gel layer on the layer side can be ensured. Furthermore, since the degree of cross-linking of the water-retaining gel layer is decreased continuously or stepwise toward the hydrophilic polymer layer in the water-retaining layer coating step, the molecular structure of the water-retaining gel layer is changed to the molecule of the hydrophilic polymer layer. The structure can be approximated, and the number of bonding points can be increased to suitably suppress the peeling or dropping of the hydrophilic polymer layer.

  The method for producing a resin molded article having surface lubricity according to the present invention is a method for producing a resin molded article having surface lubricity, wherein the water retention layer coating step crosslinks the water retention gel layer. Compared to the thickness of the hydrophilic polymer layer side and the surface activation treatment layer side, the thickness of the layer located in the middle of these layers is composed of at least three layers having different degrees. The method is characterized by comprising a step of increasing.

  The present invention ensures adhesion between the water-retaining gel layer, the hydrophilic polymer layer, and the surface activation treatment layer, and increases the time and number of times for forming a layer made of a material having a medium degree of crosslinking, for example. By making the thickness of the layer having good water retention relatively large, the water retention of the water retention gel layer can be increased.

  ADVANTAGE OF THE INVENTION According to this invention, the resin molded product which has the surface lubricity which can express high lubricity stably at the time of wetness, and its manufacturing method can be provided.

A first embodiment according to the present invention will be described with reference to FIG.
A resin molded product (hereinafter simply referred to as a resin molded product) 1 having surface lubricity according to the present embodiment is a resin molded product having a base material 2 made of polyolefin or a compound containing polyolefin. Surface activation treatment layer 3 formed on the surface 2a and having a hydrophilic group, and hydrophilicity formed on the surface of the surface activation treatment layer 3 (as the outermost layer of the resin molded product 1) and having a portion that is not insolubilized And a polymer layer 4.

  The hydrophilic polymer layer 4 is composed of at least one material selected from polyvinyl alcohol, polyethylene glycol, polyvinyl pyrrolidone, and methyl vinyl ether-maleic anhydride copolymer.

Next, the manufacturing method and operation of the resin molded product 1 according to this embodiment will be described.
The method for producing the resin molded product 1 includes a surface activation treatment step for forming the surface activation treatment layer 3 on the surface 2a of the substrate 2, and a lubrication for forming the hydrophilic polymer layer 4 having a portion that is not insolubilized. A layer coating process.

  The surface activation treatment step includes at least one treatment selected from corona discharge treatment, ultraviolet irradiation with a low-pressure mercury lamp or excimer lamp, excimer laser irradiation, plasma irradiation, and ozone treatment, and forms the surface activation treatment layer 3. . Thus, by forming the surface activation treatment layer 3 on the surface 2a of the base material 2, the C—H bond on the surface of the base material 2 is cut, and hydroxyl groups and carboxyl groups which are hydrophilic groups are removed from moisture in the atmosphere. The surface of the substrate 2 is modified to be hydrophilic.

In the lubricating layer coating step, the substrate 2 having the surface activation treatment layer 3 formed on the surface thereof is immersed in a solution containing the above-described material constituting the hydrophilic polymer layer 4 for a predetermined time, and then pulled up and dried. A hydrophilic polymer layer 4 is formed on the surface of the activation treatment layer 3. As a result, the hydrophilically modified surface activation treatment layer 3 forms a strong bond with the hydrophilic polymer and comes into close contact therewith, whereby the hydrophilic polymer layer 4 is formed.
Since the hydrophilic polymer layer 4 thus obtained has a portion that is not insolubilized, the portion that has not been insolubilized is gradually dissolved by supplying moisture to the surface. And the mixture of the melt | dissolved part and a water | moisture content acts as a lubricant between the other members.

  According to this resin molded product 1 and this manufacturing method, high lubricity can be expressed by the mixture of the dissolved hydrophilic polymer component and moisture. In addition, since the surface of the base material 2 is modified to be hydrophilic, the hydrophilic polymer layer 4 does not drop off rapidly, and stable lubricity can be obtained.

  In particular, polyvinylpyrrolidone and methyl vinyl ether-maleic anhydride copolymer are more preferable as a material constituting the hydrophilic polymer layer 4 because they are very excellent in lubricity when wet. In addition, when corona discharge treatment is used in the surface activation treatment step, microcracks can be formed on the surface of the substrate 2 depending on the discharge conditions, and the hydrophilic effect is enhanced by the anchor effect with the hydrophilic polymer layer 4. The adhesion of the molecular layer 4 can be improved.

Next, a second embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to 1st Embodiment mentioned above, and description is abbreviate | omitted.
The difference between the second embodiment and the first embodiment is that the resin molded product 5 according to this embodiment has a water retaining gel layer 6 that retains moisture and supplies moisture to the hydrophilic polymer layer 4. It is a point that it has.

  The water retention gel layer 6 is disposed between the surface activation treatment layer 3 and the hydrophilic polymer layer 4, and includes polyvinyl alcohol, polylactic acid, polyethylene oxide, cellulose, starch, methyl vinyl ether-maleic anhydride copolymer. It is composed of at least one material selected from coalescence, polyvinylpolypyrrolidone, acrylic acid, N-vinylpyrrolidone, vinyl ether monomer, and maleic anhydride monomer.

Next, the manufacturing method and operation of the resin molded product 5 according to this embodiment will be described.
In the manufacturing method of the resin molded product 5, in addition to the manufacturing method according to the first embodiment described above, the water retention gel layer 6 is formed between the surface activation treatment layer 3 and the hydrophilic polymer layer 4. A water retention layer coating step is further provided.

In the water retention layer coating step, after the surface activation treatment layer 3 is formed on the surface of the substrate 2 in the surface activation treatment step, the substrate 2 is immersed in a mixed solution containing the material constituting the water retention gel layer 6. Then, after being pulled up and dried after a predetermined time, a heat crosslinking treatment is further performed for a predetermined time.
After the water-retaining gel layer 6 is thus obtained, the same lubricating layer coating process as in the first embodiment is performed to obtain the resin molded product 5.

  According to this resin molded product 5 and this manufacturing method, since the water retaining gel layer 6 is provided, the water stored in the water retaining gel layer 6 can be supplied to the hydrophilic polymer layer 4 at any time and dried. Even in the environment, the hydrophilic polymer layer 4 can be maintained in a wet state for a long period of time. Accordingly, dissolution can occur in the insoluble portion of the hydrophilic polymer layer 4 even under conditions where there is no moisture supply from the outside, and high lubricity can be exhibited for a longer period even in a dry environment. Can do.

Next, a third embodiment will be described.
In addition, the same code | symbol is attached | subjected to the component similar to other embodiment mentioned above, and description is abbreviate | omitted.
The difference between the third embodiment and the second embodiment is that the degree of crosslinking of the water-retaining gel layer 8 of the resin molded article 7 according to this embodiment is larger than the degree of crosslinking of the hydrophilic polymer layer 4. The point is that it increases continuously or stepwise from the hydrophilic polymer layer 4 side toward the surface activation treatment layer 3 side. Here, the hydrophilic polymer layer 4 and the water-retaining gel layer 8 are provided with the same material.

The manufacturing method and operation of the resin molded product 7 will be described.
Here, the water retention layer coating step includes a step of increasing the degree of crosslinking of the water retention gel layer 8 continuously or stepwise from the hydrophilic polymer layer 4 side to the surface activation treatment layer 3 side. .

  Specifically, several types of mixed solutions in which the addition ratio of the crosslinking agent constituting the water-retaining gel layer 8 was changed continuously or stepwise were prepared, and the surface activation treatment layer 3 was formed on the surface. The substrate 2 is dipped in the mixed solution and dried repeatedly so that the degree of cross-linking in the water-retaining gel layer 8 increases stepwise from the hydrophilic polymer layer 4 side toward the surface activation treatment layer 3 side. . At this time, it is preferable to relatively increase the time for immersing the substrate 2 in a mixed solution having a medium crosslinking agent ratio among several kinds of mixed solutions, or the number of times of repeating immersion and drying. As a result, in the water retention gel layer 8, the layer formed in the region closest to the hydrophilic polymer layer 4 is not illustrated, and the layer formed in the region closest to the surface activation treatment layer 3 is not illustrated. When the second layer is used, the thickness of the intermediate layer sandwiched between the first layer and the second layer is larger than the thickness of the first layer and the second layer. Thus, after the water retention gel layer 8 is obtained, the lubricating layer coating process is performed to obtain the resin molded product 7.

  According to this resin molded product 7 and this manufacturing method, a strong film is formed on the surface activation treatment layer 3 side of the water retention gel layer 8 having a high degree of crosslinking. And adhesion to the substrate 2 can be improved. On the other hand, on the hydrophilic polymer layer 4 side of the water-retaining gel layer 8 having a low degree of crosslinking, entanglement or bonding between the non-crosslinked molecule and the hydrophilic polymer occurs, and a loose bond can be formed. . Therefore, peeling and dropping off of the hydrophilic polymer layer 4 can be suppressed. Furthermore, even after the hydrophilic polymer layer 4 has completely disappeared due to wear or the like, the lubricity close to that of the hydrophilic polymer layer 4 is maintained by gradually dissolving the water-retaining gel layer 8 having a low degree of crosslinking. Can do. Therefore, stronger bond and water retention can be obtained, and high lubricity can be exhibited over a longer period.

  In the present embodiment, the hydrophilic polymer layer 4 and the water retention gel layer 8 are provided with the same material. However, if the degree of crosslinking of the water retention gel layer 8 is greater than the degree of crosslinking of the hydrophilic polymer layer 4. The hydrophilic polymer layer 4 and the water-retaining gel layer 8 do not necessarily have to be provided with the same material.

  Furthermore, as a method for controlling the degree of crosslinking, not only adjusting the addition ratio of a material that controls the crosslinkability such as a crosslinking agent, but also control by temperature and time during thermal crosslinking, and when a photoinitiator is added. Control by light irradiation time and light intensity may be used.

Next, a fourth embodiment will be described.
In addition, the same code | symbol is attached | subjected to the component similar to other embodiment mentioned above, and description is abbreviate | omitted.
The difference between the fourth embodiment and the second embodiment is that the hydrophilic polymer layer 4 and the water-retaining gel layer 10 of the resin molded product 9 according to this embodiment have the same components as main components. The weight ratio of the component in the hydrophilic polymer layer 4 is larger than the weight ratio of the component in the water retention gel layer 10 and is continuous from the surface activation treatment layer 3 side toward the hydrophilic polymer layer 4 side. It is a point that it has increased gradually or stepwise. Here, the hydrophilic polymer layer 4 and the water-retaining gel layer 10 are provided with the same material.

The manufacturing method and operation of the resin molded product 9 will be described.
Here, the water retention layer coating step is a step of increasing the weight ratio of the main component in the water retention gel layer 10 continuously or stepwise from the surface activation treatment layer 3 side to the hydrophilic polymer layer 4 side. I have.

  Specifically, several types of mixed solutions in which the weight ratio of the main component responsible for lubrication constituting the water-retaining gel layer 10 is changed continuously or stepwise are prepared, and the surface activation treatment layer 3 is formed on the surface. The base material 2 formed on the surface is repeatedly immersed in the mixed solution and dried, and the weight ratio of the main component in the water-retaining gel layer 10 is increased from the surface activation treatment layer 3 side toward the hydrophilic polymer layer 4 side. To increase. After the water retention gel layer 10 is obtained, a lubricating layer coating process is performed to obtain a resin molded product 9.

According to the resin molded product 9 and the manufacturing method, the hydrophilic polymer layer 4 having a large weight ratio of the main component responsible for lubrication in the water-retaining gel layer 10 has a loose bond with the hydrophilic polymer. Since it can be formed, peeling and dropping off of the hydrophilic polymer layer 4 can be suppressed. Further, the lubricity on the hydrophilic polymer layer 4 side of the water-retaining gel layer 10 can be ensured, and even when the hydrophilic polymer layer 4 completely disappears due to wear or the like, it exhibits lubricity when wet. By gradually dissolving the water-retaining gel layer 10 having a high component weight ratio, lubricity close to that of the hydrophilic polymer layer 4 can be maintained. Therefore, stronger bonding and lubricity can be obtained, and higher lubricity can be exhibited over a longer period.
On the other hand, if a component other than the main component in the water retention gel layer 10 is a component that exhibits high water retention, for example, the weight ratio of this component relatively increases on the surface activation treatment layer 3 side. Water retention on the surface activation treatment layer 3 side of the conductive gel layer 10 can be ensured. In addition, since a strong film is formed on the surface activation treatment layer 3 side, the bond with the base material 2 can be improved without being broken by moisture.

  In the present embodiment, the hydrophilic polymer layer 4 and the water-retaining gel layer 10 are provided with the same material, but the hydrophilic polymer layer 4 and the water-retaining gel layer 10 have the same components as main components. As long as the weight ratio of the component in the hydrophilic polymer layer 4 is larger than the weight ratio of the component in the water-retaining gel layer 10. May not comprise the same material.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
The shape of the base material 2 can be applied to various shapes such as a tube shape, a sheet shape, and a block shape.

  Further, the present invention can be applied even when polyolefin or a compound containing polyolefin is not a single resin molded product but is coated on other materials including metal and ceramics or on the same material. For example, the present invention can be applied even in a state where the base tube is covered by extrusion molding.

(Example 1)
Corona discharge treatment on the surface of a substrate made of a polyethylene tube with an outer diameter of 5 mm, an inner diameter of 3 mm, and a length of 500 mm (manufactured by ASONE Co., Ltd .: polyethylene tube hose) at a processing power of 50 W and a processing time of 30 seconds / 100 mm in the air. (Manufactured by Tantec; CoronaGenerator Model HV05-2) was performed to form an activation treatment layer on the surface of the substrate.

  Subsequently, the base material is immersed in a 5% methyl ethyl ketone (MEK) solution of methyl vinyl ether-maleic anhydride copolymer (manufactured by Daicel Chemical Industries, Ltd.) which is a hydrophilic polymer (room temperature, 60 minutes) and dried. (60 ° C., 1 hour). Thereafter, it is further kept in warm water at 60 ° C. for 1 hour, dried (60 ° C., 12 hours) to form a hydrophilic polymer layer, and the resin molded product according to the first embodiment (sample 1) is obtained. Produced.

  Next, a low-pressure mercury lamp (Iwasaki Electric Co., Ltd., batch type ultraviolet irradiation device; OC-2506) having a lamp power of 25 W is formed on the surface of a base material made of a polypropylene tube having the same shape (manufactured by As One Co., Ltd .: PP tube). ) Was applied to form an activation treatment layer. Irradiation conditions are a distance of 10 mm and an irradiation time of 5 minutes. Thereafter, it is immersed in a 10% aqueous solution of polyvinyl alcohol (manufactured by Wako Pure Chemical Industries, Ltd .: partially saponified) for 20 minutes at room temperature, pulled up and dried (60 ° C., 3 hours) to form a hydrophilic polymer layer, A resin molded product (sample 2) according to the first embodiment was produced.

  Furthermore, the surface of the base material made of an elastomer tube obtained by extruding a polyolefin-containing styrene elastomer (manufactured by Kuraray Co., Ltd.) in the same shape as sample 1 was irradiated with ultraviolet rays under the same conditions as in sample 2 and activated. A chemical treatment layer was formed. Thereafter, it is immersed in a 5% aqueous solution of polyvinyl pyrrolidone (manufactured by Nippon Shokubai Co., Ltd.) for 30 minutes, heated to 60 ° C. and dried for 3 hours to form a hydrophilic polymer layer, and the resin molded product according to the first embodiment (Sample 3) was produced.

  On the other hand, as a comparative example 1, an untreated polyethylene tube was wetted with water, and as a comparative example 2, a polyethylene tube treated with corona discharge was treated with dimethyl sulfoxide (DMSO) (manufactured by Wako Pure Chemical Industries, Ltd., Wako). First grade): Pure water = 6: 4 In a solvent in which polyvinyl alcohol (PVA) was dissolved by heating, it was heated and dried to prepare insolubilized hydrophilic polymer samples.

  The surface of the sample S produced according to the magnitude of the force measured by a force gauge (manufactured by Imada Co., Ltd .: DPS-2) F with the evaluation machine E shown in FIG. The lubricity was evaluated. Here, the smaller the amount of insertion / removal force, the better the surface lubricity. The measurement conditions are an insertion / removal distance of 300 mm, a speed of 50 mm / second, and an insertion / removal frequency of 30 times. The inner diameter of the guide tube G in the present embodiment is φ8 mm. The inside of the guide tube G is moistened with water.

  In the evaluation, when the sample 1 was set in an evaluation machine in a state wetted with water and the amount of insertion / removal was measured, insertion / removal was possible with a force of about 200 gf. Samples 2 and 3 were evaluated in the same manner. On the other hand, as Comparative Example 1, an attempt was made to set an untreated polyethylene tube in an evaluation machine in a state where the tube was wet, and resistance to the guide tube was so great that insertion was impossible.

  Moreover, when the sample of the comparative example 2 was set to the evaluation machine in the state wetted with water and the amount of insertion / removal was measured, insertion / removal was possible with the force of about 800 gf. In particular, there was a catch at some places during insertion, and smooth insertion was difficult. In addition, when insertion / removal was performed 10 times, the insertion / removal resistance suddenly increased, making insertion impossible. When the surface was observed, a phenomenon that seemed to be a loss of the lubricating layer was observed.

  The other evaluation results are shown in Table 1. In any sample in the present embodiment, insertion / removal was possible with a lower strength than the samples of Comparative Examples 1 and 2. In addition, even after 30 insertions / removals, no significant change was observed in the amount of insertion / removal.

(Example 2)
The outer side of the wire which consists of a stainless steel copper wire and the wire which consists of a titanium / nickel / cobalt alloy copper wire was coat | covered with the olefin-type elastomer, and two types of base materials each of outer diameter (phi) about 1 mm and length 1500mm were formed.
And the ultraviolet irradiation was performed on the surface of this each base material on the same conditions as the sample 2, and the activation process layer was formed. Thereafter, it was immersed in a 20% aqueous solution of polyvinylpyrrolidone at room temperature for 120 minutes, heated and dried at 60 ° C. for 4 hours to form a hydrophilic polymer layer, and Samples 4 and 5 were produced.

  On the other hand, as Comparative Example 3, a sample obtained by coating a stainless copper wire with an olefin-based elastomer as in Sample 4 was subjected to a corona discharge treatment, and then a polyvinyl alcohol (DMSO): pure water = 6: 4 in a solvent (polyvinyl alcohol). An insolubilized hydrophilic polymer sample was prepared by dipping in a solution in which PVA) was heated and dissolved, and then heating and drying.

Evaluation of the produced sample was performed using the evaluation machine shown in FIG. The inner diameter of the guide tube in this embodiment is φ1.5 mm. The measurement conditions are an insertion / removal distance of 500 mm, a speed of 75 mm / second, and an insertion / removal count of 30 times. The guide tube was moistened with water.
Thus, when the sample 4 according to the present example was set in an evaluation machine in a state wetted with water and the amount of insertion / removal was measured, insertion / removal was possible with a force of about 50 gf.
Moreover, when the sample 5 was set to the evaluation machine in the state wetted with water and the amount of insertion / removal was measured, insertion / removal was possible with the force of about 60 gf.

  On the other hand, when the sample of Comparative Example 3 was wetted in water and set in an evaluator and the amount of insertion / removal force was measured, a force of about 120 gf was required. Moreover, after 15th, the amount of insertion / removal increased rapidly to about 300 gf. It is presumed that the outermost lubricating layer has fallen off.

  The other evaluation results are shown in Table 2. In any of the samples in this example, insertion / removal was possible with a force lower than that in Comparative Example 3, and no significant change was observed in the amount of insertion / removal after 30 insertions / removals.

  Although the base of the base material in the present embodiment is a metal, it is possible to exhibit the same action as in the first embodiment by coating the olefin resin. That is, not only a resin base but also a metal base is coated with an olefin-based resin to form a base material, so that a high level of lubricity can be stably expressed.

(Example 3)
A corona discharge treatment was performed in the atmosphere on the outer surface of a base material made of a polyethylene tube having an outer diameter of 15 mm, an inner diameter of 12 mm, and a length of 2000 mm to form an activation treatment layer. The corona discharge treatment conditions are a treatment power of 200 W and a treatment time of 5 seconds / 100 mm. Thereafter, the polyethylene tube is immersed in a solution obtained by heating and dissolving polyvinyl alcohol (PVA) in a solvent of dimethyl sulfoxide (DMSO): pure water = 5: 5, then pulled up, heated and dried to gel the PVA. A water-retaining gel layer was formed. Furthermore, after that, it was immersed in a 10% aqueous solution of polyvinyl alcohol, pulled up and dried by heating to form a hydrophilic polymer layer, thereby producing Sample 6 according to the second embodiment.

  Next, the outer surface of a 16 mm outer diameter, 12 mm inner diameter, 2000 mm long urethane tube (Nitta Moore Co., Ltd.) is coated with an olefin elastomer (Mitsubishi Chemical Co., Ltd.) by extrusion to form a substrate. did. Thereafter, the surface of the base material was irradiated with ultraviolet rays by a low-pressure mercury lamp with a lamp power of 25 W to form an activation treatment layer. Irradiation conditions are a distance of 30 mm and an irradiation time of 30 minutes. Thereafter, a mixed solution of 9 parts of methyl vinyl ether-maleic anhydride (VEMA), 1 part of cellulose (manufactured by Wako Pure Chemical Industries, Ltd .: hydroxypropyl cellulose) and 90 parts of MEK was applied to the surface and dried at 60 ° C. for 3 hours. Crosslinking was carried out by maintaining in warm water at 60 ° C. for 3 hours to form a water-retaining gel layer. Thereafter, it was immersed in a 1% MEK solution of methyl vinyl ether-maleic anhydride copolymer, dried, then kept in 75 ° C. warm water for 1 hour, and dried at 60 ° C. for 20 hours to obtain a hydrophilic polymer layer. The sample 7 according to the second embodiment was produced.

  Next, the surface of the base material made of a polypropylene tube having the same shape as that of Sample 4 was subjected to corona discharge treatment in the atmosphere to form an activation treatment layer. The corona discharge treatment conditions are a treatment power of 100 W and a treatment time of 15 seconds / 100 mm. Thereafter, N-vinylpyrrolidone monomer (manufactured by Nippon Shokubai Co., Ltd.), main chain crosslinking agent pentaerythritol triallyl ether (manufactured by Daiso Corporation), and polymerization initiator azobisisobutyronitrile (Wako Pure Chemical Industries, Ltd.) The product was dipped in a mixed solution for 60 minutes, pulled up, dried at room temperature for 12 hours, and then subjected to heat crosslinking treatment at 60 to 80 ° C. for 3 hours to form a water-retaining gel layer. Thereafter, the sample was immersed in a 20% aqueous solution of polyvinylpyrrolidone (PVP) for 60 minutes and dried at 60 ° C. for 3 hours to form a hydrophilic polymer layer, thereby producing Sample 8 according to the second embodiment.

  On the other hand, as Comparative Example 4, the outer surface of the base material made of a polyethylene tube having the same shape as Sample 6 was subjected to corona discharge treatment in the air, and then immersed, pulled up, and heat-dried in a 10% aqueous solution of polyvinyl alcohol. A hydrophilic polymer layer was formed. That is, Comparative Example 4 corresponds to the sample 6 in which the water retention gel layer is omitted.

Evaluation of the produced sample was performed by the same evaluation machine as shown in FIG. The inner diameter of the guide tube in this embodiment is φ20 mm. The measurement conditions are an insertion / removal distance of 500 mm, a speed of 50 mm / second, and an insertion / removal count of 30 times. In addition, the inside of the guide tube in the present Example was made into the dry environment, without getting wet.
When the sample 6 in the present example was set in an evaluator while wetted with water and the amount of insertion / removal was measured, insertion / removal was possible with a force of about 420 gf. Similarly, the samples 7 and 8 were also evaluated.

  On the other hand, when the sample of Comparative Example 4 was set in an evaluator while wetted with water and the amount of insertion / removal was measured, a force of about 420 gf was required. On the other hand, the amount of insertion / removal at the 30th insertion / removal was about 1200 gf. That is, although it was the same level of lubricity as the sample 6 in the initial stage, it can be seen that the lubricity was drastically lowered by repeated insertion and removal. When the sample after 30 insertions / removals was observed, it was found that the lubricating layer on the surface was dry.

  The other evaluation results are shown in Table 3. In any of the samples in the present embodiment, the amount of insertion / removal force was not significantly changed even after 30 insertions / removals with respect to Comparative Example 4.

Example 4
Corona discharge treatment on the surface of a substrate made of a polyethylene tube with an outer diameter of 5 mm, an inner diameter of 3 mm, and a length of 500 mm (manufactured by ASONE Co., Ltd .: polyethylene tube hose) at a processing power of 50 W and a processing time of 30 seconds / 100 mm in the air. (Tantec; CoronaGenerator Model HV05-2) was performed to form an activation treatment layer.

  Then, as shown in Table 4, to the acetone mixed solution in which the addition ratio of hydroxypropylcellulose (HPC) (made by Wako Pure Chemical Industries, Ltd.) to methyl vinyl ether-maleic anhydride (VEMA) was changed, the total resin weight and The same weight of distilled water was added to adjust each of the three types of coating liquids A, B, and C. Thereafter, coating and drying were repeated in the order of coating liquid A coating, drying, coating liquid B coating, drying, coating liquid C coating, and drying on the substrate on which the activation treatment layer was formed. .

  Three types of coating solutions were applied to the surface, dried at 60 ° C. for 3 hours, and then crosslinked by heating at 90 ° C. for 12 hours. Thereafter, it was hydrophilized by holding it in warm water at 60 ° C. for 1 hour to form a water-retaining gel layer in which the degree of crosslinking changes stepwise. After that, it was immersed in a 1% aqueous solution of methyl vinyl ether-maleic anhydride copolymer, dried, then kept in 75 ° C. warm water for 1 hour, and dried at 60 ° C. for 20 hours to form a hydrophilic polymer layer. Sample 9 was prepared. In this sample 9, when the water-retaining gel layer was formed, the degree of cross-linking was gradually increased from the activation treatment layer toward the hydrophilic polymer layer by gradually decreasing the addition ratio of hydroxypropyl cellulose as a cross-linking agent. It is a water-retaining gel layer that decreases to a low level.

Evaluation of the produced sample 9 was performed with the evaluation machine shown in FIG. 3 similar to the other examples. The inner diameter of the guide tube in this embodiment is φ20 mm. The measurement conditions are an insertion / removal distance of 500 mm, a speed of 50 mm / second, and an insertion / removal number of 60 times. In addition, the inside of the guide tube in this example was a dry environment without getting wet. When the sample 9 according to the present example was set in an evaluation machine in a state of being wet with water and the amount of insertion / removal was measured, insertion / removal was possible with a force of about 400 gf. Furthermore, even after 60 insertions / removals, insertion / removal was possible with a force of about 390 gf, and durability was high.
In this embodiment, the degree of cross-linking of the water-retaining gel layer is changed in three stages. However, the present invention is not limited to this and may be arbitrarily set according to the material and purpose.

(Example 5)
Corona discharge treatment on the surface of a substrate made of a polyethylene tube with an outer diameter of 5 mm, an inner diameter of 3 mm, and a length of 500 mm (manufactured by ASONE Co., Ltd .: polyethylene tube hose) at a processing power of 50 W and a processing time of 30 seconds / 100 mm in the air. (Tantec; CoronaGenerator Model HV05-2) was performed to form an activation treatment layer.

  Thereafter, a solution D in which 0.15 wt% of methylenebisacrylamide (manufactured by Wako Pure Chemical Industries, Ltd.) was dissolved in acrylic acid (manufactured by Wako Pure Chemical Industries, Ltd.) and methyl vinyl ether-maleic anhydride in pure water A solution E in which 9.8 wt% of (VEMA) and 0.2 wt% of hydroxypropylcellulose (HPC) (manufactured by Wako Pure Chemical Industries, Ltd.) were dissolved was prepared, and acrylic acid in solution D and solution E Three types of coating solutions F, G, and H in which the weight ratio of methyl vinyl ether-maleic anhydride (VEMA) was changed as shown in Table 5 were prepared. Thereafter, coating and drying were repeated in the order of coating liquid F coating, drying, coating liquid G coating, drying, coating liquid H coating and drying on the substrate on which the activation treatment layer was formed. .

  After coating three types of coating liquid on the surface, crosslinking is carried out by heating at 80 ° C. for 12 hours, and the water retention capacity in which the weight ratio of methyl vinyl ether-maleic anhydride (VEMA), which is the main component, and acrylic acid changes stepwise. A gel layer was formed. After that, it was immersed in a 1% aqueous solution of a mixture of methyl vinyl ether-maleic anhydride copolymer and acrylic acid in a weight ratio of 99.5: 0.5, dried and then kept in warm water at 75 ° C. for 1 hour. And it was made to dry at 60 degreeC for 20 hours, the hydrophilic polymer layer was formed, and the sample 10 was produced. In this sample 10, when forming the water-retaining gel layer, the main component is a methyl vinyl ether-maleic anhydride copolymer having higher lubricity, and the weight ratio is increased stepwise so that the hydrophilic property of the activated treatment layer is increased. A water-retaining gel layer whose lubricity increases stepwise toward the polymer layer.

Evaluation of the produced sample 10 was performed with the evaluation machine shown in FIG. 3 similar to the other Examples. The inner diameter of the guide tube in this embodiment is φ20 mm. The measurement conditions are an insertion / removal distance of 500 mm, a speed of 50 mm / second, and an insertion / removal number of 60 times. In addition, the inside of the guide tube in this example was a dry environment without getting wet. When the sample 10 according to the present example was set in an evaluation machine in a state wet with water and the amount of insertion / removal was measured, insertion / removal was possible with a force of about 380 gf. Furthermore, even after 60 insertions / removals, insertion / removal was possible with a force of about 390 gf, and durability was high.
In the present embodiment, the weight ratio of the main component in the water-retaining gel layer is changed in three stages, but the present invention is not limited to this and may be arbitrarily set according to the material and purpose.

It is sectional drawing which shows the resin molded product which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the resin molded product which concerns on 2nd, 3rd, and 4th embodiment of this invention. It is a schematic diagram which shows the evaluation machine used when evaluating the surface lubricity of the resin molded product which concerns on this invention.

Explanation of symbols

1, 5, 7, 9 Resin molded product 2 Base material 3 Surface activation treatment layer 4 Hydrophilic polymer layer 6, 7, 8, 10 Water retention gel layer

Claims (18)

A resin molded product based on polyolefin or a compound containing polyolefin,
A surface activation treatment layer formed on the surface of the substrate and having a hydrophilic group;
A hydrophilic polymer layer formed as an outermost layer of the resin molded product and having a portion not insolubilized;
A resin molded product having surface lubricity, characterized by comprising:   The surface lubrication according to claim 1, wherein the hydrophilic polymer layer is made of at least one material selected from polyvinyl alcohol, polyethylene glycol, polyvinyl pyrrolidone, and methyl vinyl ether-maleic anhydride copolymer. Resin molded product.   The water-retaining gel layer that retains moisture and supplies moisture to the hydrophilic polymer layer is disposed between the surface activation treatment layer and the hydrophilic polymer layer. A resin molded article having surface lubricity as described in 1 or 2.   The water retention gel layer is composed of polyvinyl alcohol, polylactic acid, polyethylene oxide, cellulose, starch, methyl vinyl ether-maleic anhydride copolymer, polyvinyl polypyrrolidone, acrylic acid, N-vinyl pyrrolidone, vinyl ether monomer, and maleic anhydride monomer. The resin molded product having surface lubricity according to claim 3, comprising at least one material selected from the group consisting of:   The resin molded product having surface lubricity according to claim 3 or 4, wherein the water retention gel layer has a degree of crosslinking greater than that of the hydrophilic polymer layer.   6. The degree of crosslinking of the water-retaining gel layer increases continuously or stepwise from the hydrophilic polymer layer side toward the surface activation treatment layer side. Resin molded product with surface lubricity. The water retention gel layer is composed of at least three layers having different degrees of crosslinking,
When the layer closest to the hydrophilic polymer layer is the first layer and the layer closest to the surface activation treatment layer is the second layer, the first layer and the thickness of the second layer are compared with the first layer. 7. The resin molded product having surface lubricity according to claim 6, wherein the thickness of the layer sandwiched between the layer and the second layer is larger.   The resin molded product having surface lubricity according to any one of claims 5 to 7, wherein the hydrophilic polymer layer and the water-retaining gel layer comprise the same material. The hydrophilic polymer layer and the water-retaining gel layer have the same component as a main component,
The resin molded article having surface lubricity according to claim 3 or 4, wherein a weight ratio of the component in the hydrophilic polymer layer is larger than a weight ratio of the component in the water-retaining gel layer.   The weight ratio of the component in the water-retaining gel layer is increased continuously or stepwise from the surface activation treatment layer side toward the hydrophilic polymer layer side. 9. A resin molded product having surface lubricity as described in 9.   The resin molding having surface lubricity according to claim 9 or 10, wherein the hydrophilic polymer layer and the water-retaining gel layer are provided with the same material having the same component as a main component. Goods. A method for producing a resin molded article based on a polyolefin or a compound containing polyolefin,
A surface activation treatment step of forming a surface activation treatment layer on the surface of the substrate;
A lubricating layer coating process for forming a hydrophilic polymer layer having a portion that is not insolubilized;
A method for producing a resin molded product having surface lubricity, comprising:   The surface activation treatment step includes at least one treatment selected from corona discharge treatment, ultraviolet irradiation with a low-pressure mercury lamp or excimer lamp, excimer laser irradiation, plasma irradiation, and ozone treatment. The manufacturing method of the resin molded product which has the surface lubricity of description.   The hydrophilic polymer layer is made of at least one material selected from polyvinyl alcohol, polyethylene glycol, polyvinyl pyrrolidone, and methyl vinyl ether-maleic anhydride copolymer. A method for producing a resin molded product having surface lubricity.   A water retention layer coating step for forming a water retention gel layer that retains moisture and supplies moisture to the hydrophilic polymer layer between the surface activation treatment layer and the hydrophilic polymer layer; The method for producing a resin molded product having surface lubricity according to any one of claims 12 to 14.   The water retention gel layer is made of polyvinyl alcohol, polylactic acid, polyethylene oxide, cellulose, starch, methyl vinyl ether-maleic anhydride copolymer, polyvinyl polypyrrolidone, acrylic acid, N-vinyl pyrrolidone, vinyl ether monomer, maleic anhydride monomer. The method for producing a resin molded product having surface lubricity according to claim 15, comprising at least one selected material.   The water retention layer coating step includes a step of increasing the degree of crosslinking of the water retention gel layer continuously or stepwise from the hydrophilic polymer layer side to the surface activation treatment layer side. The method for producing a resin molded product having surface lubricity according to claim 15 or 16.   In the water retention layer coating step, the water retention gel layer is composed of at least three layers having different degrees of crosslinking, and compared with the thickness of the hydrophilic polymer layer side layer and the surface activation treatment layer side layer. The method for producing a resin molded product having surface lubricity according to claim 17, further comprising the step of increasing the thickness of a layer located between the layers.

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