CN101749644B - Diffusion membrane and manufacturing method thereof - Google Patents
Diffusion membrane and manufacturing method thereof Download PDFInfo
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- CN101749644B CN101749644B CN 200910265795 CN200910265795A CN101749644B CN 101749644 B CN101749644 B CN 101749644B CN 200910265795 CN200910265795 CN 200910265795 CN 200910265795 A CN200910265795 A CN 200910265795A CN 101749644 B CN101749644 B CN 101749644B
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Abstract
The invention provides a diffusion membrane and a manufacturing method thereof, the diffusion membrane comprises a base material and a concave-convex micro structure layer and the concave-convex micro structure layer which is arranged at least one side of the base material; the diffusion membrane is measured according to JIS K7136 standard method, and the measurement result shows the mist degree of the diffusion membrane is not smaller than 5% and the full light transmittance is not smaller than 50%; the concave-convex micro structure layer is formed by using a coating composition containing the polymer containing the material which is identical to or similar to principle component of the base material and a material which is incompatible with the polymer, and coating the composition on the base material.
Description
Technical field
The invention relates to a kind of diffusion barrier, a kind of diffusion barrier for the high light diffusion of liquid crystal display and tool and high transparent characteristic particularly, and about a kind of method of making this kind diffusion barrier.
Background technology
Generally speaking, the primary structure of liquid crystal display (being called for short " LCD ") comprises panel and backlight module two large divisions.Wherein faceplate part mainly comprises transparent electrode plate, liquid crystal, alignment film, colored filter, polaroid and drive integrated circult etc., and the part of backlight module mainly comprises fluorescent tube, light guide plate and various blooming pieces etc.
In order to allow light be more evenly distributed at panel, the more normal practice of industry is to add diffusion barrier or diffuser plate in backlight module at present; Or further the function of light diffusion and concentration piece (prism film) or other blooming piece are done integration, for example, at the surface of reflectance coating or reflecting plate formation concave-convex micro-structure so that diffusion effect to be provided.
Known diffusion lamina membranacea mainly is to comprise the resin-bonded agent and be coated on the base material to form diffusion layer as the composition of the organic or inorganic particle of granule proliferation one.Can produce refraction, reflection and scattering during this diffusion layer of light process, therefore, this type of diffusion lamina membranacea is diffusing light effectively, reaches the effect of equalizing light rays.Yet in the process that forms diffusion layer, granule proliferation is assembled mutually easily or is sticked, and affects the uniformity coefficient of diffusing light and easily makes display surface produce dim spot.Moreover if the granule proliferation inorganic particle, because the density of inorganics is general all greater than the resin-bonded agent that is comprised of organism, so inorganic particle is easy to process and produces sedimentation because of Action of Gravity Field, causes being coated with rear quality and differs.In addition, granule proliferation also may come off, and then affects the optical property of diaphragm.
Another kind of method commonly used is to form concave-convex micro-structure on the blooming surface in the prior art, with the past bright dipping from all directions of light, reaches the effect of light homogenize by described microstructure.One of known method commonly used is the mould that utilizes the groove of tool concaveconvex structure, resin is reprinted on the blooming surface form required concaveconvex structure, for example: sandblast wheel coating process.But the method is subject to the release between resin and mould, for example, and when using vibrin, because of vibrin and reprint release poor effect between mould, therefore resin easily remains on the mould, makes prepared concaveconvex structure not as expection, thereby affects the quality of blooming.
The base material that blooming is commonly used is formed by vibrin (polyester resin), and the employed resin of diffusion layer or concave-convex micro-structure is generally acryl resin (acrylate resin), if this resinoid is machined directly on the polyester base material, will be not good because of adherence, and make the easy warpage of diaphragm.For solving this problem, general industry is many can carry out surface treatment to base material first, carries out follow-up processing again.Surface treatment method commonly used comprises: a prime coat (primer layer) is starched or applied in addition to corona, electricity on base material.Above-mentioned surface treatment step and respectively has its restriction except meeting improves manufacturing cost.For example, the unfavorable storage of surface nature meeting time to time change that electric slurry mode processing speed is slow and cost is high, the corona mode is processed, the thickness of prime coat then can affect the coating tack.
Summary of the invention
The objective of the invention is the defective for above-mentioned prior art, the invention provides a kind of diffusion barrier of diffusion particle and method of manufacturing thereof of not containing.
For achieving the above object, the technical scheme that the present invention takes is: a kind of diffusion barrier is provided, it comprises a base material and is positioned at the concave-convex micro-structure layer of at least one side of described base material, described diffusion barrier has the mist degree that is not less than 5% and the total light transmittance that is not less than 50% according to JIS K7136 standard method measurement, and wherein said concave-convex micro-structure layer is to form by the method that comprises the following steps:
(a) following component is mixed formation one coating composition:
(i) a kind of polymkeric substance by consisting of with the same or analogous material of base material major component;
(ii) one with the inconsistent material of component (i); And
(iii) solvent;
(b) described coating composition is coated on forms a coating at least one side of described base material;
(c) dry coating is to remove component (iii), and wherein component (i) during drying produces with component (ii) and is separated; And
(d) remove component (ii) to form described concave-convex micro-structure.
The method of described formation concave-convex micro-structure layer further comprises: reach afterwards step (d) before in step (c), use energy-ray to solidify component (ii).
Described base material is consisted of by plastic basis material and by the resin that is selected from the group who is comprised of vibrin, polyacrylate resin, polyolefin resin, poly-cyclic olefin resins, polyimide resin, polycarbonate resin, urethane resin, Triafol T, PLA and combination thereof.
Described base material is vibrin, and component (i) is vibrin or alkyd resin or its mixing.
Described base material is polyethylene terephthalate, and component (i) is through the toluene diisocyanate modified alkyd resin.
Wherein component (ii) is to be selected from the group who is comprised of acrylate monomer, acrylate oligomer, acrylate polymer and combination thereof.
Described coating composition further comprises adjuvant.
Wherein the weight ratio of component (i) and component (ii) is between 0.1 to 0.8.
Wherein the proportion of component (i) is greater than the proportion of component (ii).
Wherein component (iii) is benzene class, ester class or ketone or its potpourri.
It has between 15% to 75% mist degree and between 70% to 95% total light transmittance with JIS K7136 standard method measurement.
The present invention provides a kind of method of making the diffusion barrier of tool concave-convex micro-structure in addition, and it comprises:
(a) provide a base material;
(b) following component is mixed formation one coating composition:
(i) a kind of polymkeric substance by consisting of with the same or analogous material of base material major component;
(ii) a kind of and inconsistent material of component (i); And
(iii) solvent;
(c) with coating method, described coating composition is coated on forms a coating at least one side of described base material;
(d) dry coating is to remove component (iii), and wherein component (i) during drying produces with component (ii) and is separated; And
(e) remove component (ii) to form described concave-convex micro-structure.
Described coating method is to be selected from by scraper type coating, roller coating, nick version printing coating, flow coat, impregnation coating, spraying coating and curtain to be coated with the group who forms.
Described coating method is the roller coating.
It further comprises: reach afterwards step (e) before in step (d), use energy-ray to solidify component (ii).
Described energy-ray be selected from by heat energy, radiation energy and electron beam or and form group.
Described energy-ray is ultraviolet ray.
The present invention provides a kind of diffusion barrier in addition, it comprises a polyethylene terephthalate base material, at least one side of described base material comprises a concave-convex micro-structure layer, wherein said concave-convex micro-structure layer is to form with phase disengagement method, and described concave-convex micro-structure is by being consisted of through the toluene diisocyanate modified alkyd resin, and described diffusion barrier has the mist degree that is not less than 5% and the total light transmittance that is not less than 50% according to JIS K7136 standard method measurement.
Diffusion barrier of the present invention does not contain diffusion particle, and diffusion barrier of the present invention not only can improve the homogeneity of light diffusion and have the light diffusion property concurrently, therefore can effectively solve problems of the prior art.In addition, diffusion barrier of the present invention does not need extra surface treatment step and does not need to use diffusion particle, and the adherence of gained microstructured layers and base material is good, can reduce manufacturing cost, promotes industrial utilization.
Description of drawings
Fig. 1 is the displaing micro photo figure of the surface micro-structure of embodiment 1 diffusion barrier;
Fig. 2 is the displaing micro photo figure of the surface micro-structure of embodiment 2 diffusion barriers;
Fig. 3 is the displaing micro photo figure of the surface micro-structure of embodiment 3 diffusion barriers;
Fig. 4 is the displaing micro photo figure of the surface micro-structure of embodiment 4 diffusion barriers.
Embodiment
Employed term for describing described embodiment, is not to limit protection domain of the present invention only in this article.For example, employed term " " in the instructions, unless clear and definite explanation is arranged in the literary composition in addition, term " " is encompasses singular and most form.
Diffusion barrier of the present invention comprises a base material and is positioned at the concave-convex micro-structure layer of at least one side of described base material.Above-mentioned " at least one side of base material " refer to the exiting surface, incidence surface of base material or its two.
Be applicable to base material of the present invention and there is no particular restriction, it can be any the technical field of the invention has and usually knows the knowledgeable institute well known, for example: plastic basis material.The resin that consists of above-mentioned plastic basis material can be homopolymer (homopolymer) or multipolymer (copolymer), its kind there is no particular restriction, such as but not limited to: vibrin (polyester resin), such as polyethylene terephthalate (polyethylene terephthalate, PET) or Polyethylene Naphthalate (polyethylene naphthalate, PEN); Polyacrylate resin (polyacrylate resin) is such as polymethylmethacrylate (polymethyl methacrylate, PMMA); Polyolefin resin (polyolefin resin) is such as tygon (PE) or polypropylene (PP); Poly-cyclic olefin resins (polycycloolefin resin); Polyimide resin (polyimide resin); Polycarbonate resin (polycarbonate resin); Urethane resin (polyurethane resin); Triafol T (triacetylcellulose, TAC); PLA (Polylactic acid); Or its combination.Be preferably vibrin, polycarbonate resin or its combination, better is polyethylene terephthalate.The thickness of base material usually depend on want the demand of the optical articles that makes to be generally 15 microns to 300 microns.
The concave-convex micro-structure layer of diffusion barrier of the present invention is to form through the following steps:
(a) following component is mixed formation one homogeneous coating composition:
(i) a kind of polymkeric substance by consisting of with the same or analogous material of base material major component;
(ii) a kind of and inconsistent material of component (i); And
(iii) solvent;
(b) described coating composition is coated on forms a coating at least one side of described base material;
(c) dry coating is to remove component (iii), and wherein component (i) during drying produces with component (ii) and is separated; And
(d) remove component (ii) to form described concave-convex micro-structure.
In order to improve the adherence between concave-convex micro-structure and base material, the present invention uses a kind of polymkeric substance by consisting of with the same or analogous material of base material major component as component (i).Because material character and base material are same or similar, the tack between component (i) and base material is good, is removing (iii) afterwards, can anchor to be difficult on the base material peeling off.In addition, make component (ii) be difficult for component (i) with component (ii) polymerization reaction take place in curing schedule and remove from base material for fear of component (i), component (i) is preferably not polymkeric substance or saturated (saturated) polymkeric substance with component (ii) reaction.
The kind of component used in the present invention (i) can be decided on the base material kind after determining the base material kind, and selection has the material with the same or analogous characteristic of base material, and above-mentioned characteristic refers to physical property and/or the voltinism of material.For example, when base material is when being made of vibrin, component (i) is preferably vibrin or other has the polymkeric substance (such as alkyd resin etc.) of similar quality, or they's combination, and is not limited to the form of homopolymer or multipolymer.Above-mentioned vibrin is such as but not limited to oil-free polyester resin (oil free polyesterresin), such as saturated polyester resin (saturated polyester); Or high molecular weight polyester resins (a polyesterresin with a high molecular weight).Being preferably vibrin is polyethylene terephthalate (PET) or Polyethylene Naphthalate (PEN).Above-mentioned alkyd resin is such as but not limited to long oil alkyd resin (long oil alkyd resin), such as soybean oil (soya bean oil) alkyd resin or linseed oil (linseed oil) alkyd resin; Medium oil alkyd resin (medium oil alkyd resin) is such as soya bean fatty acid (soya fatty acid) alkyd resin; Short oil alkyd resin (short oil alkyd resin) is such as castor oil (castor oil) alkyd resin or coconut fatty acid (coconut fatty acid) alkyd resin; Or through modified alkyd resin (modified alkydresin), as through the ricinoleyl alcohol acid resin of toluene diisocyanate (tolylene diisocyanate, TDI) modification, through alkyd resin or epoxy-ester (epoxy ester) alkyd resin of phenylethene modified (styrene modified).Preferred alkyd resin is ricinoleyl alcohol acid resin or through the ricinoleyl alcohol acid resin of toluene diisocyanate modification, is more preferred from the ricinoleyl alcohol acid resin through the toluene diisocyanate modification.
According to an embodiment of the present invention, base material is made of polyethylene terephthalate, and component (i) is through modified alkyd resin, is preferably through the toluene diisocyanate modified alkyd resin.
The commercially available prod that can be used on component of the present invention (i) such as but not limited to: Eternal company
1101-M-70-5,
1102-M-70-5,
1103-M-70,
1106-M-70,
1107-M-70,
1105-M-55,
2105-M-55,
2105-M-70,
2109-M-70,
3304-X-70,
3306-X-70,
3403-B-65,
3401-XT-70,
1170-XM-70,
242-XM-60,
NP1020-R-47,
NP1021-R-60,
5010-S-50,
5016-R-33,
5021-R-40,
5081-R-40,
5082-R-40,
5000A,
5051-R-60,
5052-R-50 reaches
5054-TS-40; TOYOBO company
103,
200,
220,
226,
600,
660,
GK640,
GK680 reaches
GK810; Unitika company
UE-3500,
UE-3210 reaches
UE-3800; The ATR2010 of Kao company and ATR2009.
Component used in the present invention (ii) is a kind of and material component (i) incompatible (incompatible), and therefore, under solvent did not exist, component (i) and component (ii) poor compatibility can produce phenomenon of phase separation.Therefore, can after the drying component (ii) removed in coating, stay component (i) and form concave-convex micro-structure at base material.
The kind of component used in the present invention (ii) can be any the technical field of the invention to be had and usually knows the knowledgeable institute well known, but it is required to be and the inconsistent material of component (i), and preferably, the adhesion of itself and base material is less than the adhesion of component (i) with base material after drying.Above-mentioned component (ii) can be the form of monomer, oligomer or polymkeric substance or its potpourri.According to an embodiment of the present invention, when component (i) has the polymkeric substance of similar quality for vibrin or other, component (ii) is preferably acrylic ester monomer, acrylate quasi-oligomer or its potpourri, is more preferred from the potpourri of acrylic ester monomer and acrylate quasi-oligomer.
Can be used for acrylic ester monomer of the present invention such as but not limited to epoxy diacrylate (epoxydiacrylate), halogenation epoxy diacrylate (halogenated epoxy diacrylate), methyl methacrylate (methyl methacrylate), iso-bornyl acrylate (isobornyl acrylate), 2-phenoxyethyl acrylate (2-phenoxy ethyl acrylate), ethoxy ethoxy ethyl propylene acid esters (2-(2-ethoxyethoxy) ethyl acrylate), lauric acid acrylate (lauyl acrylate), stearic acid acrylate (stearyl acrylate), acrylamide (acrylamide), acrylic acid (acrylic acid), (methyl) vinyl cyanide ((meth) acrylonitrile), fluorene derivative diacrylate (fluorene derivative diacrylate), acrylic acid xenyl epoxy ethyl ester (biphenylepoxyethyl acrylate), 1,6-hexanediyl ester (1,6-hexanediol diacrylate), tripropylene glycol diacrylate (tripropylene glycol diacrylate), trimethylolpropane triacrylate (trimethylolpropane triacrylate), pentaerythritol triacrylate (pentaerythritol triacrylate), dipentaerythritol acrylate (dipentaerythritol hexaacrylateDPHA), biphenylyloxy ethyl propylene acid esters (polyethylene glycol o-phenylphenyl etheracrylate), halogenation acrylic acid xenyl epoxy ethyl ester (halogenated biphenylepoxyethyl acrylate), alkoxide epoxy diacrylate (alkoxylated epoxy diacrylate), alkyl halide oxidation epoxy diacrylate (halogenated alkoxylated epoxy diacrylate), aliphatic urethane diacrylate (aliphaticurethane diacrylate), aliphatic polyurethane six acrylate (aliphatic urethane hexaacrylate), aromatic urethane six acrylate (aromatic urethane hexaacrylate), or they's potpourri.Preferred monomer is iso-bornyl acrylate, 2-phenoxyethyl acrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, dipentaerythritol acrylate or its potpourri.
The example of commercial acrylate class monomer comprises: produced by Eternal company, commodity are by name
Or
The person.
Can be used for the molecular weight of acrylate quasi-oligomer of the present invention approximately between 1,000 to 100,000, its kind is such as but not limited to acrylate (acrylate), such as 2-hydroxyl-3-benzene oxygen propyl group acrylate (2-hydroxy-3-phenoxypropyl acrylate); Methacrylate (methacrylate); Amido formate acrylate (urethane acrylate) is such as the polyurethane of aliphatic urethane acrylate (aliphaticurethane acrylate), aliphatic urethane diacrylate (aliphatic urethanediacrylate), aliphatic polyurethane six acrylate (aliphatic urethane hexaacrylate), aromatic urethane six acrylate (aromatic urethane hexaacrylate) or acrylate ended; Epoxy acrylate (epoxy acrylate) is such as bisphenol-A epoxy diacrylate (bisphenol-A epoxy diacrylate) or Epoxy Phenolic Acrylates (novolac epoxyacrylate); Or its potpourri.Be preferably acrylate, methacrylate, aliphatic urethane acrylate, aliphatic urethane diacrylate, aliphatic polyurethane six acrylate, aromatic urethane six acrylate, bisphenol-A epoxy diacrylate or its potpourri.
The example of commercial acrylate quasi-oligomer comprises: produced by Sartomer company, commodity are by name
Or
The person; Produced by Eternal company, commodity are called 6101-
611A-
6112-
6144-
6145-
6150-
6160B-
621A-
Or 621-
The person; And by UCB. S.A.'s production, commodity are called Ebecryl
Ebecryl
Ebecryl
Or Ebecryl
The person.
Component in the coating composition of the present invention (i) is defined as follows with the weight ratio (Rw) of component (ii):
Wherein Wi is the weight of component (i), and Wii is the weight of component (ii).Rw can be used to adjust the surfaceness (or difference of height of concave-convex micro-structure) of the concave-convex micro-structure layer of diffusion barrier of the present invention, and controls the light scattering effect of obtained diffusion barrier by this.For example, according to an embodiment of the present invention, component (i) is through modified alkyd resin, component (ii) is the potpourri of acrylic ester monomer and acrylate quasi-oligomer, and Rw is preferably the scope between about 0.1 to about 0.8, and is better for 0.1 5 to about 0.6 scope.In this embodiment, when Rw less than 0.1 the time, component (i) content is very few, the protrusion density that forms at substrate surface is too sparse and protrusion is too small, can't reach light scattering effect required for the present invention; When Rw greater than 0.8 the time, component (i) easily forms a continuous level at substrate surface, surfaceness is not enough, can't reach required light scattering effect.
According to an embodiment of the present invention, component (i) has the proportion greater than component (ii).In this embodiment, because the proportion of component (i) is greater than the proportion of component (ii), forming coating and dry removing in the process of solvent, component (i) more easily sinks, not only can effectively be attached on the base material, promote utilization ratio, more can reduce the contact area of component (ii) and base material, make it easily and base material is peeled off (peeling).According to a preferred embodiments of the present invention, the proportion of component (i) is about 1.25 to about 1.4, and the proportion of component (ii) is about 0.8 to about 1.2.According to another embodiment of the present invention, component (ii) is less than the adhesion of component (i) with base material, at this moment more favourable removing at component (ii) with the adhesion of base material.
For coating composition can be uniformly coated on the base material, component used in the present invention (iii) is that a kind of simultaneously dissolved constituents (i) and component (ii) are to produce a homogeneous solvent.This case inventor the theoretical analysis and broad research find that the solvent of dissolved constituents (i) and component (ii) can select according to following principle: 1. polarity approximately principle mutually, 2. solubility parameter (solubility parameter) phase approximately principle, 3. solvation (solvation) principle, generally speaking, component (i) and component (ii) have respectively solubility parameter and/or the polarity close with component (iii), the easily effective dissolved constituents (i) of component this moment (iii) and component (ii) form a homogeneous phase solution.For example, if component (i) is selected through the toluene diisocyanate modified alkyd resin, solubility parameter is about 8.7 (cal/cm3)
0.5To about 11.1 (cal/cm3)
0.5, component (ii) is selected the potpourri of acrylic ester monomer and acrylate quasi-oligomer, and solubility parameter is about 8.8 (cal/cm3)
0.5To about 9.9 (cal/cm3)
0.5, then can select solubility parameter between above-mentioned component (i) and component (ii) between the two or with the above-mentioned solvent that both approach as component (iii), such as but not limited to xylene solvent (solubility parameter 8.8 (cal/cm3)
0.5), toluene solvant (solubility parameter 8.9 (cal/cm3)
0.5) or methyl ethyl ketone solvent (solubility parameter 9.3 (cal/cm3)
0.5).
Solvation refers to acting force between solute and the solvent molecule greater than the acting force between the solute molecule, so that solute molecule is separated from one another and be dissolved in the solvent.Therefore, do the time spent if produce strong dipole between component (i) and component (ii) and the component (ii), solvation can occur, in other words, component (iii) molecule produces interaction to component (i) molecule and component (ii) molecule respectively, when acting force during greater than the cohesion of component (i) and component (ii) self, component (iii) also might dissolved constituents (i) and component (ii).
The kind of the visual component of the present invention (i) and component (ii) selects suitable solvent as component (iii).For example, when component (i) is through modified alkyd resin and component (ii) during for the potpourri of acrylic ester monomer and acrylate quasi-oligomer, solvent (iii) can be benzene class, ester class or ketone or its potpourri.Above-mentioned benzene kind solvent is such as but not limited to benzene, toluene, o-xylene, m-xylene, P-xylene, trimethylbenzene, styrene or its potpourri.Above-mentioned esters solvent is such as but not limited to ethyl acetate, butyl acetate, diethyl carbonate, ethyl formate, methyl acetate, ethoxyethyl acetate(EA), acetic acid ethoxy propyl ester, monomethyl ether propylene glycol ester or its potpourri.Above-mentioned ketones solvent is such as but not limited to acetone, methyl ethyl ketone, methyl isobutyl ketone or its potpourri.
Coating composition of the present invention can optionally comprise the known adjuvant of any persond having ordinary knowledge in the technical field of the present invention, and it is such as but not limited to antistatic agent, rigidizer, light initiator, fluorescer, ultraviolet light absorber, inorganic particles, wetting agent (wetting agent), defoamer (defoamer), smooth dose, levelling agent (leveling agent), lubrication prescription (slipping agent), spreading agent (dispersant) or stabilization agent.
According to an embodiment of the present invention, coating composition of the present invention further comprises light trigger (photo initiator).Be applicable to light trigger of the present invention, behind irradiation, can produce free radical, and see through the transmission initiated polymerization person of free radical, it is such as but not limited to benzophenone (benzophenone), diphenylhydroxyethanone (benzoin), benzil (benzil), 2,2-dimethoxy-1,2-diphenyl second-1-ketone (2,2-dimethoxy-1,2-diphenylethan-1-one), 1-hydroxycyclohexylphenylketone (1-hydroxy cyclohexyl phenyl ketone), 2,4,6-trimethylbenzene first anilide diphenyl phosphine oxide (2,4,6-trimethylbenzoyl diphenyl phosphine oxide; TPO) or its combination.
The solid content of coating composition of the present invention in the general assembly (TW) of coating composition, is generally about 15 % by weight to about 75 % by weight, is preferably about 30 % by weight to about 65 % by weight.When solid content during less than 15 % by weight, very few because of solid content, the flow phenomenon that hangs down occurs easily; When solid content during greater than 75 % by weight, too high because of solid content, easily cause viscosity too high, the shortcoming that coating is not good.
The preparation method of coating composition of the present invention can be any persond having ordinary knowledge in the technical field of the present invention institute well known, and can allocate under the suitable environment that do not coexist according to component.According to an embodiment of the present invention, coating composition of the present invention is preparation after under about 25 ℃ each component fully being mixed.
It is persond having ordinary knowledge in the technical field of the present invention institute well known that aforementioned coating composition is applied to the mode that base material forms coating, its such as but not limited to: scraper type coating (knife coating), roller coating (roller coating), nick version printing coating (micro gravure coating), flow coat (flow coating), impregnation coating (dip coating), spraying coating (spray coating) and curtain are coated with (curtain coating).The embodiment one of according to the present invention, coating method are to adopt the roller coating.
After coating, the present invention utilizes the dry solvent that removes in coating.Because solvent during drying is removed, component (i) produces based on incompatible to each other characteristic with component (ii) and is separated, therefore can after the drying component (ii) removed in coating, stay take component (i) as main concave-convex micro-structure at base material.The temperature and time of above-mentioned drying is decided by the kind of solvent.According to an embodiment of the present invention, baking temperature is generally about 60 ℃ to about 140 ℃, is preferably about 100 ℃ to about 120 ℃, is generally about 10 seconds to about 80 seconds drying time, is preferably about 20 seconds to about 60 seconds.
In addition, for more being conducive to peeling off of component (ii), particularly when component (ii) is the form of monomer or oligomer, the present invention can be after remove solvent, use energy-ray to solidify component (ii), again with component (ii) from coating stripping.Used energy-ray can be any the technical field of the invention and has and usually know the knowledgeable institute well known, such as but not limited to heat energy, radiation energy and electron beam (e-beam), also can use more than two kinds energy-ray simultaneously or sequentially be cured.Above-mentioned radiation energy comprises infrared light, visible light, ultraviolet ray (UV light) and laser (laser).According to an embodiment of the present invention, used curing mode is ultraviolet curing (UV curing), and its exposure intensity generally can be 100 to 1000 millijoules/square centimeter (mJ/cm
2), be preferably 200 to 800 mJ/cm
2
As described earlier in this article, can adjust the surfaceness of prepared concave-convex micro-structure layer or the difference of height of concave-convex micro-structure by component in the coating composition (i) and the weight ratio of component (ii), to obtain better light scattering effect.In addition, also can by the condition of controlled working, for example baking temperature or time, adjust the surfaceness of prepared concave-convex micro-structure layer or the difference of height of concave-convex micro-structure.According to an embodiment of the present invention, the arithmetic mean roughness (Ra) of described concave-convex micro-structure layer is that about 0.2 μ m is to about 2 μ m, be preferably about 0.4 μ m to 1.5 μ m, its 10 mean roughness (Rz) are extremely about 12 μ m of about 2 μ m, are preferably about 3 μ m to about 7 μ m.
Diffusion barrier of the present invention is made described concave-convex micro-structure except coating composition being coated on the plastic basis material, also can process as base material by other known optical film (for example: scattered reflection film (diffusion reflectivefilm), condensing film (brightness enhance film), reflection polarizing film (reflectivepolarizing film) or the blooming piece of any light requirement homogenize function), make described concave-convex micro-structure, promote the light diffusion effect of diaphragm by this.
Diffusion barrier of the present invention has according to JIS K7136 standard method measurement and is not less than 5%, is preferably the mist degree (haze) between about 15% to about 75%; And have and be not less than 50%, be preferably the total light transmittance (total light transmittance) between about 70% to about 95%.
According to an embodiment of the present invention, diffusion barrier of the present invention comprises the polyethylene terephthalate base material, at least one side of described base material comprises a concave-convex micro-structure layer, wherein said concave-convex micro-structure layer be with as phase disengagement method of the present invention forms and be by being consisted of through the toluene diisocyanate modified alkyd resin, described diffusion barrier has the mist degree that is not less than 5% and the total light transmittance that is not less than 50% with JIS K7136 standard method measurement.
Diffusion barrier of the present invention does not need extra surface treatment step, and the adherence of gained microstructured layers and base material is still good, therefore can reduce manufacturing cost, promotes industrial utilization.The prepared diffusion barrier of the present invention has concave-convex micro-structure, use for example can be used in the backlight module of LCD at light supply apparatus, and the light diffusion effect is provided, above-mentioned concave-convex micro-structure can be positioned at the exiting surface, incidence surface of base material or its two, be preferably the exiting surface of base material.In addition, diffusion barrier of the present invention does not contain diffusion particle, can avoid assembling or stick the uniformity coefficient that affects diffusing light because of diffusion particle, the problem that reaches the diffusion particle sedimentation or come off and cause.
Following examples are for the invention will be further described, are not to limit the scope of the invention.Modification and change that any personage who is familiar with this skill can reach easily include in the scope of this case instructions disclosure and appended claim.
Preparation example 1
Get one 250 milliliters of vials, sequentially add 30.0 gram dipentaerythritol acrylates, 6.0 gram trimethylolpropane triacrylates, 42.0 gram pentaerythritol triacrylates, 84.0 gram aliphatic polyurethane six acrylate [Etercure 6145-100, Eternal company] and light triggers: 18.0 gram 1-hydroxycyclohexylphenylketones.Make at last solid and be 100% and the potpourri of about 180 grams of gross weight.
Preparation example 2
Get one 100 milliliters of vials, sequentially add component (iii): 46.5 gram toluene solvant, component (ii) and light triggers: potpourri, the component (i) of 26.6 gram preparation examples 1: 26.6 grams are through ricinoleyl alcohol acid resin [the Eterkyd 5010-S-50 of toluene diisocyanate modification, Eternal company, solid about 50%].Make at last the coating composition of the about 100 gram clears of solid 40% and gross weight.
Preparation example 3
Get one 100 milliliters of vials, sequentially add component (iii): 52.0 gram toluene solvant, component (ii) and light triggers: potpourri, the component (i) of 32.0 gram preparation examples 1: 16.0 grams are through ricinoleyl alcohol acid resin [the Eterkyd 5010-S-50 of toluene diisocyanate modification, Eternal company, solid about 50%].Make at last the coating composition of the about 100 gram clears of solid 40% and gross weight.
Preparation example 4
Get one 100 milliliters of vials, sequentially add component (iii): 54.4 gram toluene solvant, component (ii) and light triggers: potpourri, the component (i) of 34.2 gram preparation examples 1: 11.4 grams are through ricinoleyl alcohol acid resin [the Eterkyd 5010-S-50 of toluene diisocyanate modification, Eternal company, solid about 50%].Make at last the coating composition of the about 100 gram clears of solid 40% and gross weight.
Embodiment 1
Take RDS paint daubs #8 preparation example 2 prepared coating compositions are coated on thickness as clear PET base material [the TAIRILIN BH116 of 188 μ m, the South Asia Plastics Company] form a coating on the surface, after the desolventizing in 1 minute of 100 ℃ of dryings, again with UV exposure bench [Fusion UV, F600V, 600 W/inch, H type lamp source], energy-ray 200 mJ/cm2 are solidified, then utilize adhesive tape [Scotch #610,3M company] paste coating surface and peel off and solidify rear component (ii), making gross thickness is the diffusion barrier of the tool concave-convex micro-structure of 190 μ m.
Embodiment 2
Use the method identical with embodiment 1, but use 110 ℃ temperature removal in dry 30 seconds solvent, making gross thickness is the diffusion barrier of the tool concave-convex micro-structure of 190 μ m.
Embodiment 3
Use the method identical with embodiment 1, be coated with but change with preparation example 3 prepared coating compositions, making gross thickness is the diffusion barrier of the tool concave-convex micro-structure of 190 μ m.
Embodiment 4
Use the method identical with embodiment 1, be coated with but change with preparation example 4 prepared coating compositions, making gross thickness is the diffusion barrier of the tool concave-convex micro-structure of 190 μ m.
Comparative example 1
Will be through ricinoleyl alcohol acid resin [the Eterkyd 5010-S-50 of toluene diisocyanate modification, Eternal company, solid about 50%], be coated on thickness as clear PET base material [the TAIRILIN BH116 of 188 μ m take RDS paint daubs #8, the South Asia Plastics Company] on the surface, after the desolventizing in 1 minute of 100 ℃ of dryings, make the diffusion barrier that gross thickness is 190 μ m.
Comparative example 2
The potpourri of preparation example 1 is coated on the clear PET base material [TAIRILINBH116 that thickness is 188 μ m, the South Asia Plastics Company] on the surface, again with UV exposure bench [Fusion UV, F600V, 600 W/inch, H type lamp source], energy-ray 200 mJ/cm2 are solidified, and make at last the diffusion barrier that gross thickness is 190 μ m.
Comparative example 3
Will be through ricinoleyl alcohol acid resin [the Eterkyd 5010-S-50 of toluene diisocyanate modification, Eternal company, solid about 50%], roller take the surperficial tool concaveconvex structure indentation of blasting treatment is coated on thickness as clear PET base material [the TAIRILIN BH116 of 188 μ m, the South Asia Plastics Company] on the surface, after the desolventizing in 1 minute of 100 ℃ of dryings, make at last the diffusion barrier that average thickness is 190 μ m.
Method of testing:
Thickness test: utilize film thickness gauge [model PIM-100, TESA company], press down the thickness that the way of contact measures coating to be measured with 1N.
Mist degree/total light transmittance test: utilize haze meter [model NDH 5000W, Japan electric look company], according to JIS K-7136 standard method, measure mist degree (Hz%) and the total light transmittance (Tt%) of coating to be measured, shown in the following tabulation 1 of test acquired results.
Surfaceness test: utilize roughmeter [model Surftest SJ-201, Mitsutoyo company], measure the arithmetic mean roughness (Ra of coating to be measured according to JIS B-0601 standard method, the μ m of unit) with 10 mean roughness (Rz, the μ m of unit), shown in the following tabulation 1 of test acquired results.
Adherence test: utilize hundred lattice scrapers [model C ross-cut Guide CCJ-1, CHUO SEIMITSUKIKI company] scratch film coated surface, film with adhesive tape sticking subsequently, tear up with 90 ° again, judge and peel off the lattice number, measure coating to be measured for the adherence of PET base material according to JIS K-5400 standard method, shown in the following tabulation 1 of test acquired results.
The diffusion barrier character comparison sheet of table 1 embodiment and comparative example
| The weight ratio (Rw) of component (i) and component (ii) | Hz ％ | Tt ％ | The adherence test | R a | R z | |
| Embodiment 1 | 0.56 | 60. 12 | 89. 15 | Coating is without coming off | 0. 51 | 3. 77 |
| Embodiment 2 | 0.56 | 70. 77 | 91. 33 | Coating is without coming off | 0. 85 | 5. 45 |
| Embodiment 3 | 0.28 | 33. 04 | 89. 14 | Coating is without coming off | 1. 11 | 5. 42 |
| Embodiment 4 | 0.19 | 17. 35 | 89. 13 | Coating is without coming off | 0. 47 | 5. 11 |
| Comparative example 1 | 1/0 | 2.3 0 | 88. 19 | Coating is without coming off | ||
| Comparative example 2 | 0/1 | 2.5 0 | 89. 42 | Coating shedding | ||
| Comparative example 3 | 1/0 |
* the part resin residue occurs on roller in comparative example 3 in coating process, causes to be coated with unsuccessfully.
Observe respectively the surface micro-structure of the diffusion barrier of embodiment 1 to embodiment 4 with optical microscope, the gained figure as shown in Figures 1 to 4.By the result of Fig. 1 to 4 as can be known, when component (i) ratio is lower, the ups and downs density of prepared diffusion barrier is more sparse.
By the result of embodiment 1 to 4 as can be known: component (i) and the weight ratio of component (ii) can affect mist degree and the total light transmittance of diffusion barrier.Component (i) ratio is lower, and the mist degree of prepared diffusion barrier is lower.Therefore, the visual needs of in fact using, the ratio by adjusting component (i) and component (ii) is to prepare various diffusion barriers with different mist degrees and total light transmittance.
By the result of embodiment 1 and 2 as can be known: embodiment 1 and 2 uses identical coating composition, but embodiment 2 carries out drying with higher temperature and short period, and the diffusion barrier of gained has higher mist degree.Therefore, except the scattering nature of ratio with the control diffusion barrier of capable of regulating component (i) and component (ii), also can by process parameter such as control baking temperature and/or times, to adjust the character of gained diffusion barrier, make the demand in its more realistic application.
Embodiment 1 to 4 employed clear PET base material is close with component (i) material character, and adhesion is good, all can test by adherence, and prepared concave-convex micro-structure layer and base material occur without obscission.
As shown in Table 1: comparative example 1 and 2 diffusion barrier only have by component (i) or the formed coating of component (ii), and the surface generates without obvious concave-convex micro-structure, so its mist degree only is respectively 2.3% and 2.5%, and effective light diffusion effect can't be provided.In addition, the coating of comparative example 1 is made of component (i), and material character and base material are close, and adhesion is good, can test by adherence; Otherwise the coating of comparative example 2 is made of component (ii), and it solidifies the poor adhesive force of rear and base material, comes off fully after the adherence test.
Claims (17)
1. diffusion barrier, it comprises a base material and is positioned at the concave-convex micro-structure layer of at least one side of described base material, described diffusion barrier has the mist degree that is not less than 5% and the total light transmittance that is not less than 50% according to JIS K7136 standard method measurement, the arithmetic mean roughness Ra of described concave-convex micro-structure layer is 0.4 μ m to 1.5 μ m, and wherein said concave-convex micro-structure layer is to form by the method that comprises the following steps:
(a) following component is mixed formation one coating composition:
(i) a kind of polymkeric substance by consisting of with the same or analogous material of base material major component;
(ii) one with the inconsistent material of component (i); And
(iii) solvent;
Wherein, the proportion of component (i) is greater than the proportion of component (ii);
(b) described coating composition is coated on forms a coating at least one side of described base material;
(c) dry coating is to remove component (iii), and wherein component (i) during drying produces with component (ii) and is separated; And
(d) remove component (ii) to form described concave-convex micro-structure layer.
2. diffusion barrier as claimed in claim 1 is characterized in that, the method for described formation concave-convex micro-structure layer further comprises: reach afterwards step (d) before in step (c), use energy-ray to solidify component (ii).
3. diffusion barrier as claimed in claim 1, it is characterized in that described base material is consisted of by plastic basis material and by the resin that is selected from the group who is comprised of vibrin, polyacrylate resin, polyolefin resin, poly-cyclic olefin resins, polyimide resin, polycarbonate resin, urethane resin, Triafol T, PLA and combination thereof.
4. diffusion barrier as claimed in claim 1 is characterized in that, described base material is vibrin, and component (i) is vibrin or alkyd resin or its mixing.
5. diffusion barrier as claimed in claim 4 is characterized in that, described base material is polyethylene terephthalate, and component (i) is through the toluene diisocyanate modified alkyd resin.
6. diffusion barrier as claimed in claim 4 is characterized in that, component (ii) is to be selected from the group who is comprised of acrylate monomer, acrylate oligomer, acrylate polymer and combination thereof.
7. diffusion barrier as claimed in claim 1 is characterized in that, described coating composition further comprises adjuvant.
8. diffusion barrier as claimed in claim 1 is characterized in that, the weight ratio of component (i) and component (ii) is between 0.1 to 0.8.
9. diffusion barrier as claimed in claim 6 is characterized in that, component (iii) is benzene class, ester class or ketone or its potpourri.
10. diffusion barrier as claimed in claim 1 is characterized in that, it has between 15% to 75% mist degree and between 70% to 95% total light transmittance with JIS K7136 standard method measurement.
11. a method of making the diffusion barrier of tool concave-convex micro-structure, it comprises:
(a) provide a base material;
(b) following component is mixed formation one coating composition:
(i) a kind of polymkeric substance by consisting of with the same or analogous material of base material major component;
(ii) a kind of and inconsistent material of component (i); And
(iii) solvent;
Wherein, the proportion of component (i) is greater than the proportion of component (ii);
(c) with coating method, described coating composition is coated on forms a coating at least one side of described base material;
(d) dry coating is to remove component (iii), and wherein component (i) during drying produces with component (ii) and is separated; And
(e) remove component (ii) to form the concave-convex micro-structure layer;
The arithmetic mean roughness Ra of described concave-convex micro-structure layer is 0.4 μ m to 1.5 μ m.
12. method as claimed in claim 11 is characterized in that, described coating method is to be selected from by scraper type coating, roller coating, nick version printing coating, flow coat, impregnation coating, spraying coating and curtain to be coated with the group who forms.
13. method as claimed in claim 12 is characterized in that, described coating method is the roller coating.
14. method as claimed in claim 11 is characterized in that, it further comprises: reach afterwards step (e) before in step (d), use energy-ray to solidify component (ii).
15. method as claimed in claim 14 is characterized in that, described energy-ray be selected from by heat energy, radiation energy and electron beam or and form group.
16. method as claimed in claim 14 is characterized in that, described energy-ray is ultraviolet ray.
17. diffusion barrier, it comprises a polyethylene terephthalate base material, at least one side of described base material comprises a concave-convex micro-structure layer, wherein said concave-convex micro-structure layer is to form with phase disengagement method, and described concave-convex micro-structure is by being consisted of through the toluene diisocyanate modified alkyd resin, and described diffusion barrier has the mist degree that is not less than 5% and the total light transmittance that is not less than 50% according to JISK7136 standard method measurement; The arithmetic mean roughness Ra of described concave-convex micro-structure layer is 0.4 μ m to 1.5 μ m.
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| CN103939844A (en) * | 2013-01-17 | 2014-07-23 | 鸿富锦精密工业（深圳）有限公司 | Diffusion sheet and backlight module |
| CN109581577A (en) * | 2019-01-03 | 2019-04-05 | Oppo（重庆）智能科技有限公司 | Display screen component and electronic device with it |
| WO2021035596A1 (en) * | 2019-08-29 | 2021-03-04 | 京东方科技集团股份有限公司 | Polarizer, display panel, and display device |
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Address after: China's Taiwan City, Kaohsiung three people's District, 578 road construction Patentee after: Changxing material industry limited-liability company Address before: China's Taiwan City, Kaohsiung three people's District, 578 road construction Patentee before: Changxing Chemical Industrial Co., Ltd. |
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