Displacement prevention coating agent

Abstract

A displacement prevention coating agent is provided which can prevent a displacement in lens processing, which is soluble in water and which exhibits a transparent appearance at least after being cured. The displacement prevention coating agent may coat the front and rear surfaces of a lens so that when cutting processing is performed on an end surface of the lens, a holding position of the front and rear surfaces of the lens held by a chuck device is prevented from being displaced. A water-repellent coat layer may be formed as a membrane such that the end surface has a shape corresponding to a frame. The displacement prevention coating agent may be formed of an aqueous solution whose main components are a hydrophilic resin, a surfactant having a perfluoro group and an emulsion.

Claims

1. A displacement prevention coating agent with which at least one of front and rear surfaces of a lens is coated so that when cutting processing is performed on an end surface of the lens where a coat layer is formed as a membrane such that the end surface has a shape corresponding to a frame, a holding position where the front and rear surfaces of the lens are held by a holding means is prevented from being displaced, wherein the displacement prevention coating agent comprises an aqueous solution comprising a hydrophilic resin, a surfactant having a perfluoro group, and a particulate transparent resin composition that is insoluble in water and exhibits a transparent appearance at least after the formation of the membrane.

2. The displacement prevention coating agent according to claim 1, wherein the particulate transparent resin composition comprises a dispersed phase of an emulsion.

3. The displacement prevention coating agent according to claim 2, wherein the emulsion is a water-based emulsion.

4. The displacement prevention coating agent according to claim 2, wherein the dispersed phase of the emulsion comprises an ethylene-vinyl acetate copolymer, a vinyl acetate-acrylic copolymer, an acryl-styrene copolymer, polyacryl, or a combination thereof.

5. The displacement prevention coating agent according to claim 1, wherein a particle diameter of the particulate transparent resin composition ranges from 0.1 m to 1.0 m.

6. The displacement prevention coating agent according to claim 1, wherein the hydrophilic resin comprises polyvinyl alcohol.

7. The displacement prevention coating agent according to claim 1, wherein the hydrophilic resin comprises methylcellulose.

8. A displacement prevention coating agent with which at least one of front and rear surfaces of a lens is coated so that when cutting processing is performed on an end surface of the lens where a coat layer is formed as a membrane such that the end surface has a shape corresponding to a frame, a holding position where the front and rear surfaces of the lens are held by a holding means is prevented from being displaced, wherein the displacement prevention coating agent comprises an aqueous solution comprising a hydrophilic resin, a surfactant having a branched perfluoro group, and a particulate transparent resin composition that is insoluble in water and exhibits a transparent appearance at least after the formation of the membrane.

9. The displacement prevention coating agent according to claim 8, wherein the hydrophilic resin is methylcellulose.

10. The displacement prevention coating agent according to claim 8, wherein the particulate transparent resin composition comprises a dispersed phase of an emulsion.

11. The displacement prevention coating agent according to claim 10, wherein the emulsion is a water-based emulsion.

12. The displacement prevention coating agent according to claim 10, wherein the dispersed phase of the emulsion comprises an ethylene-vinyl acetate copolymer, a vinyl acetate-acrylic copolymer, an acryl-styrene copolymer, polyacryl, or a combination thereof.

13. The displacement prevention coating agent according to claim 8, wherein a particle diameter of the particulate transparent resin composition ranges from 0.1 m to 1.0 m.

14. The displacement prevention coating agent according to claim 8, wherein the hydrophilic resin comprises polyvinyl alcohol.

15. A displacement prevention coating agent with which at least one of front and rear surfaces of a lens is coated so that when cutting processing is performed on an end surface of the lense where a coat layer is formed as a membrane such that the end surface has a shape corresponding to a frame, a holding position where the front and rear surfaces of the lens are held by a holding means is prevented from being displaced, wherein the displacement prevention coating agent comprises an aqueous solution comprising a hydrophilic resin, a surfactant having a perfluoro group and a polyoxyethylene ether group, and a particulate transparent resin composition that is insoluble in water and exhibits a transparent appearance at least after the formation of the membrane.

16. The displacement prevention coating agent according to claim 15, wherein the particulate transparent resin composition comprises a dispersed phase of an emulsion.

17. The displacement prevention coating agent according to claim 16, wherein the emulsion is a water-based emulsion.

18. The displacement prevention coating agent according to claim 16, wherein the dispersed phase of the emulsion comprises an ethylene-vinyl acetate copolymer, a vinyl acetate copolymer, a vinyl acetate-acrylic copolymer, an acryl-styrene copolymer, polyacryl, or a combination thereof.

19. The displacement prevention coating agent according to claim 15, wherein a particle diameter of the particulate transparent resin composition ranges from 0.1 m to 1.0 m.

20. The displacement prevention coating agent according to claim 15, wherein the hydrophilic resin comprises polyvinyl alcohol.

Description

BEST MODE FOR CARRYING OUT THE INVENTION

(1) Although the present invention will be specifically described using examples, the present invention is not limited to these examples.

Example 1

(2) A [Displacement Prevention Coating Agent]

(3) In Example 1, as a water-soluble resin, polyvinyl alcohol (polymerization degree of 2000, saponification degree of 98.5 mol % or more, made by Nippon Synthetic Chemical Industry Co., Ltd.) was used. In Example 1, as a surfactant, Ftergent 251 (made by Neos Company Ltd.) was used. Ftergent 251 is a fluorine-based surfactant. The main component of Ftergent 251 is a fluorine-based surfactant of n=8 in the rational formula represented by Chemical Formula 1 described above. Furthermore, as an emulsion, an emulsion was used in which an ethylene-vinyl acetate copolymer (made by Sumika Chemtex Co., Ltd.) whose particle diameter is about 0.6 m was used as a dispersed phase.

(4) 10.0 weight % of the water-soluble resin was dissolved at room temperature (25 C.) in 77.45 weight % of water, 0.05 weight % of the fluorine-based surfactant and 2.5 weight % of the emulsion were mixed with this resin aqueous solution and were sufficiently agitated and finally 10.0 weight % of Solmix AP-7 (composition: 85.5 weight % of ethanol, 14.5 weight % of propyl alcohol and 0.2 weight % or less of water, made by Japan Alcohol Corporation) was added, with the result that a displacement prevention coating agent was produced.

(5) B [Lens]

(6) On a plastic lens on which a hard coat layer and an antireflection layer were formed as membranes, which had optical properties with a refractive index of 1.6 and an Abbe number of 40 and in which S power was 3.00 D and C power was 1.00 D, a coat layer as described below was formed as a membrane. As the coat layer, a lens base member where the antireflection layer was formed was coated with an evaporation material (SURFCLEAR100 made by Canon Optron Inc.) containing a fluorine compound which is chemically bonded by reacting with a silanol group by a resistance heating method. The water contact angle of the coat layer was measured by adhering 2.5 L of water droplets to an antifouling layer, and the average value thereof was determined to be 117.

(7) In all of the examples and comparative examples below, the same lens was used.

(8) C [Membrane Formation on Lens with Displacement Prevention Coating Agent]

(9) The plastic lens was immersed in the displacement prevention coating agent at room temperature, and a membrane was formed on the entire surface of the lens at a pulling rate of 100 ram/min. In an oven previously kept at 50 C., drying was performed for 30 minutes, and thus a resin solution was cured.

(10) In all of the examples below, membrane formation was performed in the same manner.

(11) [Evaluation Result]

(12) The result is shown in Table 1.

Example 2

(13) A [Displacement Prevention Coating Agent]

(14) In Example 2, as a water-soluble resin, the same polyvinyl alcohol as in Example 1 was used. As an emulsion, the emulsion was used in which the same ethylene-vinyl acetate copolymer as in Example 1 was used as the dispersed phase.

(15) On the other hand, in Example 2, as a fluorine-based surfactant, Megafac F-444 (made by DIS Corporation) was used.

(16) 10.0 weight % of the water-soluble resin was dissolved at room temperature (25 C.) in 77.45 weight % of water, 0.05 weight % of the fluorine-based surfactant and 2.5 weight % of the emulsion were mixed with this resin aqueous solution and were sufficiently agitated and finally 10.0 weight % of Solmix AP-7 was added as in Example 1, with the result that a displacement prevention coating agent was produced.

(17) The description of B and C will be omitted.

(18) [Evaluation Result]

(19) The result is shown in Table 1.

Example 3

(20) A [Displacement Prevention Coating Agent]

(21) In Example 3, as a water-soluble resin, the same polyvinyl alcohol as in Example 1 was used. As a surfactant, the same Megafac F-444 as in Example 2 was used.

(22) In Example 3, as an emulsion, an emulsion was used in which a vinyl acetate-acrylic copolymer (made by DIC Corporation) whose particle diameter is about 0.5 m was used as a dispersed phase.

(23) 10.0 weight % of the water-soluble resin was dissolved at room temperature (25 C.) in 77.45 weight % of water, 0.05 weight % of the fluorine-based surfactant and 2.5 weight % of the emulsion were mixed with this resin aqueous solution and were sufficiently agitated and finally 10.0 weight % of Solmix AP-7 was added as in Example 1, with the result that a displacement prevention coating agent was produced.

(24) The description of B and C will be omitted.

(25) [Evaluation Result]

(26) The result is shown in Table 1.

Example 4

(27) A [Displacement Prevention Coating Agent]

(28) In Example 4, as a water-soluble resin, the same polyvinyl alcohol as in Example 1 was used. As a surfactant, the same Megafac F-444 as in Example 2 was used.

(29) In Example 4, as an emulsion, an acrylic-styrene copolymer (made by DIC Corporation) whose particle diameter is about 0.3 m was used.

(30) 10.0 weight % of the water-soluble resin was dissolved at room temperature (25 C.) in 77.45 weight % of water, 0.05 weight % of the fluorine-based surfactant and 2.5 weight % of the emulsion were mixed with this resin aqueous solution and were sufficiently agitated and finally 10.0 weight % of Solmix AP-7 was added as in Example 1, with the result that a displacement prevention coating agent was produced.

(31) The description of B and C will be omitted.

(32) [Evaluation Result]

(33) The result is shown in Table 1.

Example 5

(34) A [Displacement Prevention Coating Agent]

(35) In Example 5, as a water-soluble resin, the same polyvinyl alcohol as in Example 1 was used. As a surfactant, the same Megafac F-444 as in Example 2 was used.

(36) In Example 5, as an emulsion, an emulsion was used in which polyacryl (made by DIC Corporation) whose particle diameter is about 0.3 m was used as a dispersed phase.

(37) 10.0 weight % of the water-soluble resin was dissolved at room temperature (25 C.) in 77.45 weight % of water, 0.05 weight % of the fluorine-based surfactant and 2.5 weight % of the emulsion were mixed with this resin aqueous solution and were sufficiently agitated and finally 10.0 weight % of Solmix AP-7 was added as in Example 1, with the result that a displacement prevention coating agent was produced.

(38) The description of B and C will be omitted.

(39) [Evaluation Result]

(40) The result is shown in Table 1.

Example 6

(41) A [Displacement Prevention Coating Agent]

(42) In Example 6, as a water-soluble resin, Metolose (made by Shin-Etsu Chemical Co., Ltd.) was used. The main component of Metolose is methylcellulose.

(43) In Example 6, as a surfactant, the same Ftergent 251 as in Example 1 was used. In Example 6, as an emulsion, the emulsion was used in which the same ethylene-vinyl acetate copolymer as in Example 1 was used as a dispersed phase.

(44) 1.5 weight % of the water-soluble resin was dissolved at room temperature (25 C.) in 85.95 weight % of water, 0.05 weight % of the fluorine-based surfactant and 2.5 weight % of the emulsion were mixed with this resin aqueous solution and were sufficiently agitated and finally 10.0 weight % of Solmix AP-7 was added as in Example 1, with the result that a displacement prevention coating agent was produced.

(45) The description of B and C will be omitted.

(46) [Evaluation Result]

(47) The result is shown in Table 1.

Comparative Example 1

(48) A [Displacement Prevention Coating Agent]

(49) In Comparative Example 1, as a water-soluble resin, the same polyvinyl alcohol as in Example 1 was used.

(50) In Comparative Example 1, as a surfactant, Ftergent 251 was used. No emulsion was used.

(51) 10.0 weight % of the water-soluble resin was dissolved at room temperature (25 C.) in 79.95 weight % of water, 0.05 weight % of the fluorine-based surfactant was mixed with this resin aqueous solution and was sufficiently agitated and finally 10.0 weight % of Solmix AP-7 was added as in Example 1, with the result that a displacement prevention coating agent was produced.

(52) The description of B will be omitted.

(53) C [Membrane Formation on Lens with Displacement Prevention Coating Aagent]

(54) A membrane was formed under the same conditions as in the examples described above except at a pulling rate of 130 mm/min.

(55) [Evaluation Result]

(56) The result is shown in Table 2.

Comparative Example 2

(57) A [Displacement Prevention Coating Agent]

(58) In Comparative Example 2 as well, as a water-soluble resin, the same polyvinyl alcohol as in Examples 1 to 5 and Comparative Example 1 was used.

(59) In Comparative Example 2, as a surfactant, Ftergent 251 was used. No emulsion was used.

(60) 12.0 weight % of the water-soluble resin was dissolved at room temperature (25 C.) in 77.95 weight % of water, 0.05 weight % of the fluorine-based surfactant was mixed with this resin aqueous solution and was sufficiently agitated and finally 10.0 weight % of Solmix AP-7 was added as in Example 1, with the result that a displacement prevention coating agent was produced.

(61) The description of B will be omitted.

(62) C [Membrane Formation on Lens with Displacement Prevention Coating Agent]

(63) A membrane was formed under the same conditions as in the examples described above except at a pulling rate of 200 mm/min.

(64) [Evaluation Result]

(65) The result is shown in Table 2.

Comparative Example 3

(66) A [Displacement Prevention Coating Agent]

(67) In Comparative Example 3, as a water-soluble resin, the same polyvinyl alcohol as in Examples 1 to 5 and Comparative Examples 1 and 2 was used.

(68) In Comparative Example 3, as a surfactant, Megafac F-444 was used. No emulsion was used.

(69) 10.0 weight % of the water-soluble resin was dissolved at room temperature (25 C.) in 79.95 weight % of water, 0.05 weight % of the fluorine-based surfactant was mixed with this resin aqueous solution and was sufficiently agitated and finally 10.0 weight % of Solmix AP-7 was added as in Example 1, with the result that a displacement prevention coating agent was produced.

(70) The description of B will be omitted.

(71) C [Membrane Formation on Lens with Displacement Prevention Coating Agent]

(72) A membrane was formed under the same conditions as in the examples described above except at a pulling rate of 130 mm/min.

(73) [Evaluation Result]

(74) The result is shown in Table 2.

Comparative Example 4

(75) A [Displacement Prevention Coating Agent]

(76) In Comparative Example 4, as a water-soluble resin, the same

(77) Metolose as in Example 6 was Used.

(78) In Comparative Example 4, as a surfactant, Ftergent 251 was used. No emulsion was used.

(79) 1.5 weight % of the water-soluble resin was dissolved at room temperature (25 C.) in 88.45 weight % of water, 0.05 weight % of the fluorine-based surfactant was mixed with this resin aqueous solution and was sufficiently agitated and finally 10.0 weight % of Solmix AP-7 was added as in Example 1, with the result that a displacement prevention coating agent was produced.

(80) The description of B will be omitted.

(81) C [Membrane Formation on Lens with Displacement Prevention Coating Agent]

(82) A membrane was formed under the same conditions as in the examples described above except at a pulling rate of 130 mm/min.

(83) [Evaluation Result]

(84) The result is shown in Table 2.

(85) Performance Evaluation Method

(86) (a) Membrane Formation Appearance

(87) The appearance of a protective membrane applied to the surface of an optical lens after being cured was visually inspected, and paint spots and the state when the membrane thickness was increased were evaluated. Criteria are as follows.

(88) : A membrane was formed on the entire lens, and even when a thick membrane was formed, the appearance was satisfactory.

(89) : A membrane was formed on the entire lens.

(90) : A protective membrane was partially separated.

(91) x: A protective membrane was not formed.

(92) Here, and indicate that the membrane state is not problematic for use at all, and in particular, in the state of , even when the membrane thickness is increased, the leveling property is maintained, the membrane can be finely formed and a very satisfactory state is achieved. There is a tendency that satisfactory membrane formation appearance corresponds to the evaluation of lens-shape processing.

(93) (b) Lens-Shape Processing

(94) A double-faced tape for lens processing (LEAP III tape made by Sumitomo 3M Limited) was stuck to the optical center of the lens. Thereafter, a ball grinding machine (LE-9000SX made by NIDEK Co., Ltd.) including a chuck device was used to perform lens-shape processing on the lens. The shaft displacement and the amount of center displacement in the optical center before and after the lens-shape processing were evaluated.

(95) : No shaft displacement and no center displacement

(96) : Shaft displacement was 2 or less and center displacement was 1 mm or less.

(97) : Shaft displacement was 2 to 5 and center displacement was 1 to 2 mm.

(98) x: Shaft displacement was 5 or more or center displacement was 2 mm or more.

(99) (c) Transparency

(100) The power of the optical lens on which the protective membrane was formed was measured with a lens meter (LM-990A made by NIDEK Co., Ltd.). Whether or not the position of the optical center and the power were substantially the same before and after the formation of a resin membrane was evaluated.

(101) : The position of the optical center was 1 mm or less, and the power was 0.05 D.

(102) x: The position of the optical center exceeded 1 mm or the power exceeded 0.05 D.

(103) According to the results of the evaluation, in any of Examples 1 to 6, the membrane formation appearance was substantially satisfactory. It is found from the results that when as a water-soluble resin, polyvinyl alcohol was used, and as an emulsion, an emulsion was used in which an ethylene-vinyl acetate copolymer was used as a dispersed phase, under the same conditions, it is possible to maximize the membrane thickness, and the appearance was satisfactory.

(104) In Examples 1 to 3, the evaluation of the lens-shape processing was substantially satisfactory whereas in Examples 4 to 6, the evaluation of the lens-shape processing was slightly lower but fell within a usable range. It can be considered that the reason why in Examples 4 to 6, the evaluation of the lens-shape processing was slightly lower was that as compared with Examples 1 to 3, the membrane thickness was smaller. In any of the examples, the thickness was substantially uniform, and satisfactory membrane formation results were obtained. In particular, in Examples 1 to 3, the membrane thickness was sufficient, thus a sufficient cushioning property was achieved on the coat layer and hence the shaft displacement and the center displacement were prevented, with the result that satisfactory processing was performed. In Examples 4 to 6, the membrane thickness was not excellent as compared with Examples 1 to 3 but the shaft displacement and the center displacement were substantially prevented by the cushioning property of the emulsion, with the result that the processing was performed. In any of Examples 1 to 6, the transparency was satisfactory.

(105) On the other hand, in the comparative examples, as the membrane thickness was increased, the membrane formation appearance was degraded, and in particular, in Comparative Example 2 where the membrane thickness was set to 15 m, the uniformity of the membrane formation appearance was not achieved (the membrane was remarkably thick and thin). When the uniformity of the membrane formation appearance is not achieved, a burden is placed on a thin portion, and this causes a shaft displacement and a center displacement, and this also slightly affects the power measurement performed with the lens meter. It can be considered that this is because no emulsion is present and the uniformity of the membrane when the membrane thickness is increased is reduced.

(106) In any of the comparative examples, under the same conditions as in the examples, the lens-shape processing evaluation was not satisfactory. For example, in Comparative Example 1 where the membrane formation appearance was satisfactory, the membrane thickness compares favorably with the examples so as to be 10 m but the lens-shape processing evaluation was not satisfactory. In other words, it can be considered that in the comparative examples, no emulsion was used, and thus as compared with the examples, the cushioning property of the emulsion was not expected.

(107) TABLE-US-00001 TABLE 1 Protective membrane components Protective membrane Examples material Surfactant Emulsion 1 PVA Ftergent 251 Ethylene-vinyl acetate copolymer 2 PVA Megafac F-444 Ethylene-vinyl acetate copolymer 3 PVA Megafac F-444 Vinyl acetate-acrylic copolymer 4 PVA Megafac F-444 Acryl-styrene copolymer 5 PVA Megafac F-444 Acryl 6 Metolose Ftergent 251 Ethylene-vinyl acetate copolymer Evaluation Membrane Membrane Lens-shape thickness formation processing Examples (m) appearance evaluation Transparency 1 15 .circle-solid. .circle-solid. 2 15 .circle-solid. .circle-solid. 3 13 4 10 5 10 6 10 .circle-solid.

(108) TABLE-US-00002 TABLE 2 Protective membrane components Protective Comparative membrane examples material Surfactant Emulsion 1 PVA Ftergent 251 None 2 PVA Ftergent 251 None 3 PVA Megafac F-444 None 4 Metolose Ftergent 251 None Evaluation Membrane Membrane Lens-shape Comparative thickness formation processing examples (m) appearance evaluation Transparency 1 10 X 2 15 X X 3 10 X 4 5 X