CN102540730A - Positive image ultraviolet-computer-to-plate ((UV-CTP) planographic printing plate - Google Patents
Positive image ultraviolet-computer-to-plate ((UV-CTP) planographic printing plate Download PDFInfo
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- CN102540730A CN102540730A CN2010106143034A CN201010614303A CN102540730A CN 102540730 A CN102540730 A CN 102540730A CN 2010106143034 A CN2010106143034 A CN 2010106143034A CN 201010614303 A CN201010614303 A CN 201010614303A CN 102540730 A CN102540730 A CN 102540730A
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Abstract
The invention discloses a positive image UV-CTP planographic printing plate, which comprises a plate supporting body, wherein an alkali soluble resin is coated on the supporting body; a positive image photosensitive layer is coated on the alkali soluble resin layer; and the alkali soluble resin comprises an alkali soluble resin, an additive resin and a dye. The plate has the advantages of high photosensitive speed, high developing tolerance, high resolution, high solvent resistance, high printing resistance and the like. The UV-CTP planographic printing plate has high storage stability and can better adapt to the conventional UV-CTP platemaking.
Description
Technical field
The invention belongs to CTP platemaking technology field, be specifically related to a kind of positive UV-CTP lithographic plate plate.
Background technology
CTP (CTP) technology replaces conventional analogue plate-making mode gradually because of advantages such as its digitizing, efficient high-quality and easy, environmental protection, becomes the approach that printing enterprise realizes technology upgrading.At present the CTP plate-making mode of main flow is divided into three types of thermosensitive CTP, purple laser c TP and UV-CTP, and wherein UV-CTP can use the operation of directly making a plate of traditional PS plate because of it is known as, and in market, is promoted fast.
The laser energy of the UV-CTP of the market mainstream lower (100-300mw) adopts the multiple laser device to increase energy more, with assurance plate-making energy and publication efficient, but the manufacturing cost of platemaking machine is significantly increased, even surpasses 50% of total cost.Nonetheless, the traditional PS plate that meets the UV-CTP ctp request also should have higher film speed 50-80mj/cm
2
The traditional PS version is generally single layer structure, uses photolysis type diazo naphthoquinone compounds as photosensitizer.This type of photosensitizer had not only served as in prescription to be seen the photolysis material but also serves as resistance solvent (stop or slow down film-forming resin-phenolics and in alkaline-based developer, dissolve).The consumption of photosensitizer is big more, and it is abundant more that effect is dissolved in resistance, and film speed is slow more; It is not obvious that the phase anti-drag dissolves effect, and film speed is fast more.The ability that plate opposing developer solution corrodes is called alkali resistance.Generally, the alkali resistance of plate is strong more, and resolution and press resistance rate are high more; And alkali resistance more a little less than, resolution and press resistance rate are low more.
Up to now, improve the film speed of traditional PS version, realize through the consumption that reduces photosensitizer usually, but the plate alkali resistance obviously reduces, directly have influence on imaging precision and press resistance rate.Therefore, the light sensitivity of traditional PS version and alkali resistance are to be difficult to unified contradiction.In addition, after the photosensitizer consumption in the prescription significantly reduced, the phenomenon of film speed decay also can appear in plate in depositing process.
Summary of the invention
The objective of the invention is to solve the above-mentioned technical matters that exists in the prior art, a kind of positive UV-CTP lithographic plate plate is provided.
For realizing above-mentioned purpose, the technical scheme that the present invention adopts is following:
Positive UV-CTP lithographic plate plate of the present invention; Comprise the plate support; On support, be coated with the alkali soluble resins layer, on the alkali soluble resins layer, be coated with the positive-type photosensitive layer, said alkali soluble resins layer contains alkali soluble resins, adds resin and illuminating colour.
Described alkali soluble resins is employed in any one or more the combination in the organic high molecular polymer of solubility in buck or the water or swellability; Weight average molecular weight range is between 1000-1000000; Be preferably 2000-200000; The quality percentage composition of alkali soluble resins in the alkali soluble resins layer is 40-90%, is preferably 70-90%.
Described interpolation resin is polyurethane polymer, vinyl addition polymer, esters of acrylic acid addition polymer, acetals polymkeric substance or cellulosic polymer; Adding the quality percentage composition of resin in the alkali soluble resins layer is 10-60%, is preferably 10-30%.
Described illuminating colour is one or more in Victoria's ethereal blue, alkaline bright blue, solvent blue, crystal violet, methyl violet or the methylene blue, and the quality percentage composition of illuminating colour in the alkali soluble resins layer is 0.5-5%, is preferably 0. 5-2%.
Said alkali soluble resins layer coating weight is 0.5 ~ 1.5g/m
2, be preferably 0.5 ~ 1.0 g/m
2
Comprise in the described photographic layer that film-forming resin, interpolation resin, Photoactive compounds, light produce acid source and illuminating colour.
Said film-forming resin is a linear phenolic resin, and weight-average molecular weight is 2000-10000, is preferably 2500-7500, M
w/ M
nBe 1.5-20, be preferably 1.5-10.The quality percentage composition of film-forming resin in photographic layer is 20-80%, is preferably 50-80%.
Described interpolation resin is one or more in polyurethane polymer, vinyl addition polymer, esters of acrylic acid addition polymer, acetals polymkeric substance, the cellulosic polymer; Adding the quality percentage composition of resin in photographic layer is 2-10%, is preferably 5-10%.
Are (the interpolation resin in the photographic layer and the interpolation resin of resin bed had any different? Like different in the original copy well.The effect of adding resin is to improve the physical strength of coating and physical property, and photographic layer is identical with the interpolation resin effect in the resin bed, and compound is also identical)
Said Photoactive compounds is the diazonium naphthoquinone sulphonate compounds, and its esterification parent is phenols macromolecular compounds such as low molecule polyhydric phenols or linear phenolic resin, and the weight-average molecular weight of esterification parent is 2000-10000, is preferably 2500-4000; M
w/ M
nBe 1.5-20, be preferably 1.5-10, the hydroxy esterification rate is the 10-80% of initial hydroxyl, is preferably 20-50%, and the quality percentage composition 10-40% of Photoactive compounds in photographic layer is preferably 10-20%.
Described light produce acid source in the near ultraviolet band and the ultraviolet region compound of photolysis reactions can take place smoothly, the spectrum induction range is 350-420nm, light produce acid source in photographic layer the quality percentage composition be 0.1-5 weight %, be preferably 0.1-2%.
Described illuminating colour is Victoria's ethereal blue, alkaline bright blue, solvent blue, crystal violet, methyl violet or methylene blue, and quality percentage the see amount of illuminating colour in the alkali soluble resins layer is 0.5-5%, is preferably 0.5-2%.
Positive UV-CTP lithographic plate plate of the present invention can be used for UV light source such as carbon arc lamp, high-pressure mercury-vapor lamp, xenon lamp, metal halide lamp, fluorescent light, tungsten lamp, Halogen lamp LED, helium cadmium laser, argon laser, FD-YAG laser, He-Ne Lasers, semiconductor laser (350nm-450nm), photographic layer is carried out image exposure.The best is selected the exposure of UV-CTP platemaking machine for use.
Detailed description of the present invention is following:
(1) alkali soluble resins layer
The alkali soluble resins layer contains alkali soluble resins, adds resin and illuminating colour etc.Alkali soluble resins layer coating weight 0.5 ~ 1.5g/m
2, preferred 0.5 ~ 1.0 g/m
2
Therefore said alkali soluble resins must be able to be dissolved in the alkaline-based developer, uses the organic high molecular polymer of in buck solubility or swellability.Organic high molecular polymer as such comprises:
(1) side chain has carboxylic acid group's addition polymer, i.e. methacrylic acid copolymer, acrylic copolymer, itaconic acid copolymer, crotonic acid multipolymer, maleic acid, partial esterification maleic acid etc.,
(2) has carboxylic acid group's acid cellulose derivant at side chain;
(3) at polymkeric substance with addition cyclic acid anhydride on the addition polymer of hydroxyl etc.;
(4) linear phenolic resin and tygon phenol resin, linear phenolic resin can be through the polycondensation reaction preparation, and wherein one of monomer must be an aromatic hydrocarbons, such as: phenol, orthoresol, metacresol; Paracresol, 2,5-xylenol, 3,5-xylenol, resorcinol; Pyrogallol, bisphenols, bis-phenol-A, triphenol faces ethyl phenol, an ethyl phenol; To ethyl phenol, propyl phenoxy, normal-butyl phenol, tert-butyl phenol, 1-naphthols, beta naphthal.Minimum aldehyde or ketone.Wherein aldehyde can be formaldehyde, acetaldehyde, valeral, benzaldehyde, furfural.Ketone can be acetone, MEK, methyl n-butyl ketone, trioxymethylene.Weight-average molecular weight is confirmed through GPC.Be advisable with 1000 to 15000,1500 is best to 10000.Linear phenol-aldehyde resin is by aldehyde and phenol condensation.Metacresol/paracresol in the phenol/2,5-diphenol/3,5-diphenol/phloroglucin/blending ratio is 40 to 100/0 to 50/0 to 20/0 to 20/0 to 20/.Or phenol/orthoresol/paracresol/blending ratio is 1 to 100/0 to 70/0 to 60/.The tygon phenol resin can be by one or more hydroxy styrenes polymerization, such as: adjacent this ethene of hydroxyl, a hydroxy styrenes, para hydroxybenzene ethene, 2-(o-hydroxy-phenyl) propylene, 2-(hydroxy phenyl) propylene, 2-(p-hydroxybenzene) propylene.Can be on these hydroxy styrenes by substituting group.Such as chlorine, bromine, halogen atoms such as iodine and fluorine, the perhaps alkyl of C1-4 is so that have these groups on the corresponding resin.These PEF phenol resin are by one or more hydroxy styrenes polymerization.On it substituting group can be arranged, it is better to be associated with the C1-4 alkyl on the aromatic ring of PEF phenol, and unsubstituted is better.
(5) side chain has carboxylic acid group's polyvinyl acetaldehyde polymkeric substance;
(6) addition polymer of side chain with phosphate is like addition polymer of containing the vinyl phosphoric acid unit etc.
Said alkali soluble resins can be above-mentioned high molecular polymer, and weight average molecular weight range is between 1000-1000000, and the optimum weight scope is between the 2000-200000, the combination of any or several kinds.The percentage by weight of said alkali soluble resins in the alkali soluble resins layer is 40-90%, and the best is 70-90%.
Said interpolation resin plays the whole alkali solubility of adjustment alkali soluble resins layer and the effect of increase alkali soluble resins layer intensity, can use polyurethane polymer, vinyl addition polymer, esters of acrylic acid addition polymer, acetals polymkeric substance, cellulosic polymer etc.Adding the percentage by weight of resin in the alkali soluble resins layer is 10-60%, and the best is 10-30%.
Illuminating colour can be selected from dyestuffs such as Victoria's ethereal blue, alkaline bright blue, solvent blue, crystal violet, methyl violet, methylene blue in the alkali soluble resins layer.Preferred Victoria's ethereal blue, alkaline bright blue, solvent blue.The percentage by weight of illuminating colour in the alkali soluble resins layer is 0.5-5%, and the best is 0.5-2%.
(2) photographic layer
Comprise in the photographic layer that film-forming resin, interpolation resin, Photoactive compounds (PAC), light produce acid source, illuminating colour etc., the photographic layer coating weight is 0.5 ~ 1.5g/m
2, be preferably 0.5 ~ 1.0 g/m
2
(1) film-forming resin
The used film forming resin is a linear phenolic resin among the present invention, wherein comprises the linear phenolic resin that phenol-formaldehyde resin, metacresol-formaldehyde resin, orthoresol-formaldehyde resin, paracresol-formaldehyde resin, phenol-metacresol (mole ratio 3:7-7:3)-formaldehyde resin, phenol-tertiary butyl phenol (mole ratio 3:1-1.5:1)-formaldehyde resin, metacresol-paracresol (mole ratio 9:1-5:5)-formaldehyde resin, metacresol-orthoresol-a kind of phenols such as formaldehyde resin, two kinds of phenols even three kinds of phenols and formaldehyde form by the different proportion polycondensation.Their weight-average molecular weight is generally selected 2000-10000, preferred 2500-7500.M
w/ M
nBe 1.5-20, preferred 1.5-10.When molecular weight greater than 10000 the time, the linearity of phenolics descends, the degree of branching increases, thereby the solubleness in alkaline developer descends, development is met difficulty; Molecular weight is too little, in the developing process alkali resistance too a little less than, be easy to produce the photodissociation stripping phenomenon, a little less than the pressrun of plate, also have influence on the resolution of plate and the reductibility of site.It is 20-80 weight % that the film-forming resin consumption accounts for the photosensitive composition general assembly (TW), preferred 50-80 weight %.
(2) add resin
Used interpolation resin is 1,2,3,-thrihydroxy-benzene-condensation of acetone resin among the present invention, and this resin polymerization degree is 20-40 generally speaking, shows the shortcoming that wears no resistance with the alkali resistance difference when being used for film-forming resin.The 1,2,3,-thrihydroxy-benzene that the special selective polymerization degree of the present invention is lower-condensation of acetone resin has following structure as adding resin:
N representes 2-10, and the natural number of preferred 3-6 makes positive PS printing plate light sensitive composition and uses the flat stamping version of said composition to have high light sensitivity and big exposure latitude.It is 2-10 weight % that interpolation branch consumption accounts for the photosensitive composition general assembly (TW), preferred 5-10 weight %.
(3) Photoactive compounds
Photoactive compounds in the tradition positive PS printing plate light sensitive component is the diazonium naphthoquinone sulphonate compounds, and its esterification parent can be low molecule polyhydric phenols, also can be phenols macromolecular compounds such as linear phenolic resin.Used Photoactive compounds adopts linear phenolic resin to import parent as macromolecule among the present invention, the part of hydroxyl esterification of linear phenolic resin is obtained as graft with the diazo naphthoquinone sulfonic acid chloride.The synthetic used linear phenolic resin of this family macromolecule Photoactive compounds can be an above-mentioned film-forming resin phenolics commonly used, the linear phenolic resin that instance has phenol-formaldehyde resin, metacresol-formaldehyde resin, orthoresol-formaldehyde resin, paracresol-formaldehyde resin, phenol-metacresol (mole ratio 3:7-7:3)-formaldehyde resin, phenol-tertiary butyl phenol (mole ratio 3:1-1.5:1)-formaldehyde resin, metacresol-paracresol (mole ratio 9:1-5:5)-formaldehyde resin, metacresol-orthoresol-a kind of phenols such as formaldehyde resin, two kinds of phenols even three kinds of phenols and formaldehyde to form by the different proportion polycondensation.Their weight-average molecular weight is generally selected 2000-10000, and preferred 2500-7500 most preferably is 2500-4000; M
w/ M
nBe 1.5-20, preferred 1.5-10 most preferably is 2.0-4.0.The hydroxy esterification rate can be the 10-80% of initial hydroxyl, preferred 20-50%.The synthetic Photoactive compounds of institute use amount in photosensitive composition is 10-40%, is preferably 10-20%, if consumption is too big, the molten ability of resistance is too strong, the difficulty of developing; If consumption very little, scarce capacity is dissolved in resistance, and alkali resistance is poor, is easy to produce the photodissociation stripping phenomenon, a little less than the pressrun of plate.
(4) light produces acid source
Use up among the present invention produce acid source in the near ultraviolet band and ultraviolet region (320-450nm) compound of photolysis reactions can take place smoothly, the optimal spectrum induction range is 350-420nm.Optional representative trichloromethyl compound in triazine class is like 1-phenyl-3; The 5 pairs of trichloromethyl triazines, 1-anisyl-3; The 5 pairs of trichloromethyl triazines, 1-are to methoxy styryl-3,5 pair trichloromethyl triazine, 1-methoxy-naphthyl-3,5 pair trichloromethyl triazine etc.It is 0.1-5 weight % that the consumption of light product acid source accounts for the photosensitive composition general assembly (TW), preferred 0.1-2 weight %.
(5) illuminating colour
Used background illuminating colour can be selected from dyestuffs such as Victoria's ethereal blue, alkaline bright blue, solvent blue, crystal violet, methyl violet, methylene blue among the present invention.Owing to consider and to reduce the plate sensitivity, preferred Victoria's ethereal blue, alkaline bright blue, solvent blue to ultraviolet absorption.It is 0.5-5 weight % that its consumption accounts for the photosensitive composition general assembly (TW), preferred 0.5-2 weight %.
The invention provides the double-deck positive-type UV-CTP of a kind of employing plate, lower floor is the alkali soluble resins layer, and the upper strata has solved the contradiction between diazo naphthoquinone system film speed and the alkali resistance preferably for having good resistance alkalescence diazo naphthoquinone light sensitive layer.This plate has advantages such as high film speed, high development tolerance, high resolving power, solvent resistance and high press resistance rate, and has excellent storage stability, makes a plate thereby be adapted to present UV-CTP mode more.
The present invention is owing to adopt said components, and the double-deck positive-type UV-CTP plate that makes thus has advantages such as high film speed, high development tolerance, high resolving power and high press resistance rate, and has excellent storage stability, and its impact of performance is seen table 1.
Embodiment
Details are as follows with regard to the concrete manufacturing process of this kind photo-polymerization type lithographic printing plate below.
One, support
The support that uses in the utility model can use aluminium or its alloy alloy of silicon, copper, manganese, magnesium, chromium, zinc, lead, bismuth, nickel (for example with) of dimensionally stable.Usually can use the material known of in aluminium handbook the 4th edition (1990, light metal association distribution), putting down in writing in the past.Aluminium plate can be the aluminium plate that adopts common semi-continuous casting method (DC method) to make, and also can be the aluminium plate that adopts the continuous casting rolling process to make in addition.As the method for continuous casting calendering, can use double roller therapy, tape casting method, piece material casting method etc.The content of xenogenesis element is below the 10 weight % in the alloy.The thickness of aluminium plate preferably is about about 0.1mm one 0.6 mm.In addition, the plastic foil or the paper of aluminium, aluminium alloy that also can use lamination or vapor deposition.
1, the surface treatment of support
When support is aluminium plate, according to purpose various processing are implemented on its surface usually.As general disposal route, at first degreasing or electrolytic polishing are handled and crude removal is handled through aluminium plate is carried out, and the aluminium surface is cleaned.Then, implement the mechanical surface roughened or/and the electrochemical surface roughened, give the aluminium plate surface fine concavo-convex.In addition, also increasing chemical etching processing and crude removal sometimes handles.Then,, implement anodized, as required hydrophilicity-imparting treatment is implemented or/and sealing of hole is handled in the aluminium surface then in order to improve the abrasion performance on aluminium plate surface.
Between the reason, do not bring next into for the treating fluid that makes previous processed and handle throughout, the liquid that preferably adopts nip rolls to carry out is removed and is adopted and the washing of carrying out such as sprays.In addition, can the overflow waste liquid of the electrolytic solution that uses in the electrochemical surface roughened be used as the crude removal treating fluid, but the washing that can omit this moment after crude removal is handled is handled.
(1) degreasing one electrolytic polishing is handled
The rolling oil that exists on the aluminium plate, autoxidation epithelium, dirt etc. are removed; Turn to purpose to carry out electrochemical rough surface equably; In acidic aqueous solution, carry out the electrolytic polishing of aluminium plate and handle, or in acid or aqueous alkali, carry out the chemical etching processing of aluminium plate.Handle the meltage preferred dissolution 1--30g/m of the aluminium plate that produces
2More preferably dissolve 1.5-20g/m
2
(2) electrolytic polishing is handled
Can use the known WS that is used for electrolytic polishing.The WS that preferably is the main body with sulfuric acid or phosphoric acid, preferred especially is the WS of main body with phosphoric acid.Can be from phosphoric acid 20-90 weight % (preferred 40-80 weight %), liquid temperature 10 1 90 ℃ of (preferred 50 1 80 ℃), current density 1-100A/dm
2(preferred 5-80A/dm
2), select in 180 seconds the scope of electrolysis time.Can in phosphate aqueous solution, add 50 weight % sulfuric acid, chromic acid, hydrogen peroxide, citric acid, hydrofluorite, phthalic anhydride etc.Electric current can use direct current, pulse direct current or exchange, but preferred direct current continuously.The device that electrolytic processing apparatus can use known electrolytic treatments such as flat type groove, star-like groove to use.Flow velocity is with respect to aluminium plate, can for and stream, adverse current any, from the scope that 0.01--10000cm/ divides, choose.
The preferred 0.3--10cm of the distance of aluminium plate and electrode, preferred especially 0.8-2cm.Can use for method for electrically and adopt the direct of conductive rollers, also can use the indirect electric mode (liquid is given electric mode) of giving that does not adopt conductive rollers to electric mode.The electrode material of using, structure can use known material, the structure that uses in the electrolytic treatments, the preferred carbon of negative electrode material, the preferred ferrite of anode material, indium oxide or paper tinsel.
(3) chemical etching in acid or aqueous alkali is handled
In acid or aqueous alkali, carry out the chemical etching processing of aluminium plate and can use these known means.The liquid temperature is preferably 25-90 ℃, preferably carries out 1-120 and handles second.Preferred 0.5-25 weight % of the concentration of acidic aqueous solution, the aluminium that more preferably in acidic aqueous solution, dissolves is 0.5-5 weight %.Preferred 5-30 weight % of the concentration of aqueous alkali, the aluminium that more preferably in aqueous alkali, dissolves is 30 weight %.
(4) crude removal is handled
After etch processes, when the WS that uses alkali has carried out chemical etching, owing to generate dirt, therefore general with phosphoric acid, nitric acid, sulfuric acid, chromic acid or contain these nitration mixture and handle (crude removal processing) in the interior acid more than 2 kinds on the surface of aluminium.The acidic aqueous solution that uses can dissolve 0-5 weight % aluminium, ℃ implements preferred 1-30 of processing time second down from normal temperature to 70 in the liquid temperature.In addition, as this acidic aqueous solution, can use the waste liquid of the electrolytic solution that in electrochemical surface roughened etc., uses, must be noted that not make aluminium plate dry, the one-tenth in the crude removal liquid analyzes.After the crude removal processing finished, in order not bring treating fluid into subsequent processing, the liquid that preferably adopts nip rolls to carry out was removed and is adopted and spray the washing of carrying out, but when next operation is the same WS, also can omit washing.
(5) mechanical surface roughened
In order to obtain good aluminum support,, give fine concavo-convex normally to the surperficial graining of aluminium plate.Mechanical surface roughened such as general known pelletization, brush granulation, tinsel granulation, sandblast granulation in this graining, but as a large amount of and continuous processing, the brush granulated processed is excellent.Specifically, at the slurries of aluminium plate jet surface silica sand, hydrate of aluminium etc.,, carry out the mechanical surface roughened with the nylon brush roll rotation that 50-500rpm makes bristle footpath 0.2-0.9mm.The consumption electric power (removing the essence electric power of the mechanical loss of CD-ROM drive motor) of the rotation drive motor of the power that is pressed into of brush. preferred 0.2-15kw, more preferably 0.5-10kw.
(6) electrochemical surface roughened
Use direct current the electrochemical surface roughened with hydrochloric acid or nitric acid the WS as main body; Can use the WS that in the electrochemical surface roughened of using common interchange, uses, can in the hydrochloric acid of 1-100g/L or aqueous solution of nitric acid, add 1g/L has the hydrochloric acid or the nitrate compound of salt acid ion to saturated aluminium nitrate, sodium nitrate, ammonium nitrate etc. use more than 1.The metal of in addition, can dissolved iron in the WS that is the main body with hydrochloric acid or nitric acid, containing in the aluminium alloy such as copper, manganese, titanium, magnesium, silicon dioxide.The preferred use added aluminum chloride, aluminium nitrate so that aluminium ion reaches the liquid of 3-50g/L in the hydrochloric acid or nitric acid 0.5-2 weight % WS.Preferred 10 1 60 ℃ of temperature, more preferably 25-50 ℃.Use the treating apparatus that uses in the electrochemical surface roughening of direct current to make
With the device of known use direct current, use anode and the mutual devices of arranging of negative electrode a pair of or more than two pairs.It is the direct current below 20% that the direct current that uses in the electrochemical surface roughening preferably uses pulsation rate.Preferred 10-the 200A/dm of current density
2, preferred 10 1 1000C/dm of the electric weight when aluminium plate is anode
2Anode can be from ferrite, indium oxide, paper tinsel, known oxygen such as compound or plating paper tinsel is selected use taking place with electrode on valve metals such as titanium, niobium, zirconium.Negative electrode can be selected to use from carbon, paper tinsel, titanium, niobium, zirconium, stainless steel, the electrode that cathode for fuel cell, uses.
Use the electrochemical surface roughened that exchanges with hydrochloric acid or nitric acid the WS as main body; Can use the WS that in the electrochemical surface roughened that common use exchanges, uses; Can in the hydrochloric acid of 1--100g/L or aqueous solution of nitric acid, add lg/L and have nitrate ion to saturated aluminium nitrate, sodium nitrate, ammonium nitrate etc., aluminum chloride, sodium chloride, ammonium chloride etc. have at least 1 use of the hydrochloric acid or the nitrate compound of salt acid ion.The metal of in addition, can dissolved iron in the WS that is the main body with hydrochloric acid or nitric acid, containing in the aluminium alloy such as copper, manganese, nickel, titanium, magnesium, silicon dioxide.
The preferred use added aluminum chloride, aluminium nitrate etc. so that aluminium ion reaches the liquid of 3-50g/L in the hydrochloric acid or nitric acid 0.5-2 weight % WS.Preferred 10-60 ℃ of temperature, more preferably 20-50 ℃.
The AC power ripple that uses in the electrochemical surface roughening uses marking wave, square wave, platform shape ripple, triangular wave etc., but preferred square wave or platform shape ripple, preferred especially platform shape ripple.Electric current is from preferred 1-3msec of the time (TP) at 0 arrival peak.If littler than 1msec, it is inhomogeneous with the processing of the electric shock ripple of the vertical generation of direct of travel of aluminium plate to be easy to generate what is called.If TP is bigger than 3msec, in the electrolytic solution that in the electrochemical surface roughening, uses with ammonium ion etc. as the electrolytic treatments in the nitric acid liquid of representative in, the influence that receives nature to produce the micro constitutent that increases easily is difficult for carrying out the generation sand holes of homogeneous.
The duty ratio that platform shape ripple exchanges can use 1:2-2:1, in aluminium, does not use giving indirectly in the electric mode of conductive rollers, preferred duty ratio 1:l.The frequency that platform shape ripple exchanges can be used 0.1--120Hz, preferred 50 1 70Hz on the equipment.If lower than 50Hz, the carbon electrode of main pole dissolves easily, if bigger than 70Hz, receives the influence of the inductance composition on the electric power loop easily, the power supply cost up.But, when use contains the aluminium alloy greater than the Cu of 0.1wt%, the interchange of preferred frequency of utilization 0.1--10Hz.Preferred 10-the 200A/dm of the peak value of the current waveform of current density
2
The electrolytic tank that uses in the electrochemical surface roughening can use the electrolytic tank that uses in longitudinal type, platypelloid type, the known surface treatment such as star-like, and the electrolytic solution that in electrolytic tank, passes through can be parallel with advancing of aluminium net, also can drive in the wrong direction with it.
In the AC power that can connect on the electrolytic tank more than 1.The anode that exchanges that on the aluminium plate relative with main pole, adds and the current ratio of negative electrode are controlled,, made the part shunting of alternating current preventing impressed current anode preferably to be set aspect the carbon dissolution of main pole.Through rectifier cell or on-off element; DC current on the impressed current anode that is provided with on the other groove outside the part shunting conduct that makes current value and 2 central electrodes can be controlled with the ratio of the current value of participating in anode reaction the participation cathode reaction current value that on the aluminium plate relative with main pole, acts on.On the aluminium plate relative, participate in ratio when anode (electric weight during negative electrode/electric weight) preferred 0.3-0.95 of the electric weight of anode reaction and cathode reaction with main pole.
Be in the WS of major component with nitric acid or hydrochloric acid, using to exchange or direct current, with 10---1000C/dm
2Electric weight this aluminium plate is carried out the electrochemical surface roughened, in acidic aqueous solution, use electric current to exchange as 1-3msec and frequency platform shape ripple from 0 to time of peaking as 50---70Hz.
(7) (utilizing a sour alkalies) handled in chemical etching
So that whole of the fine concavo-convex sand holes that form in mechanical surface roughened, the electrochemical surface roughened, dirt etc. are removed is purpose, carries out chemical etching and handles.The liquid temperature is preferably 25-90 ℃, preferably carries out 1-120 and handles second.Preferred 0.5-25 weight % of the concentration of acidic aqueous solution, the aluminium that more preferably in acidic aqueous solution, dissolves is 0.5-5 weight %.Preferred 5-30 weight % of the concentration of aqueous alkali, the aluminium that more preferably in aqueous alkali, dissolves is 1--30 weight %.In acid or aqueous alkali, carry out etch processes so that the meltage of aluminium plate reaches 1g/m
2More than, 30g/m
2Below or the meltage of aluminium reach 0.1g/m
2More than, 3g/m
2Below.
In addition; When the WS of use alkali carries out chemical etching; Owing to generate dirt on the surface of aluminium, therefore in this case generally with phosphoric acid, nitric acid, sulfuric acid, chromic acid or contain these nitration mixture and carry out etch processes (required crude removal processing) in the interior acid more than 2 kinds.(identical) with above-mentioned crude removal record.
(8) anodized
In order to improve water-retaining property, the abrasion performance on aluminium plate surface, implement anodized.The electrolyte that uses in the anodized as aluminium plate if form the porous oxide scale film, can use any electrolyte.Usually use sulfuric acid, phosphoric acid, oxalic acid, chromic acid or their mixed liquor.These electrolytical concentration are because of the suitably decision of electrolytical kind.Anodised treatment conditions become because of employed electrolyte, therefore cannot treat different things as the same, if electrolytical concentration is 1--80wt% usually, the liquid temperature is 5-70 ℃, and current density is 1--60A/dm
2, voltage 1--100V, electrolysis time 5 seconds--be suitable in-300 seconds the scope.Sulfuric acid process is handled with DC current usually, but also can use interchange.The amount of anodic oxide coating is 0.5-10g/m
2Scope be suitable.The concentration of sulfuric acid uses 5-30%.In 20-60 ℃ temperature range, carry out 5-250 second electrolytic treatments.Preferably in this electrolytic solution, contain aluminium ion.The current density of this moment is 1--50A/dm more preferably
2Under the situation of phosphoric acid method, under the concentration 5-50%, 30-60 ℃ the temperature, 10-300 seconds, 1--15A/dm
2Current density under handle.The amount of anodic oxide coating is preferably 1.0g/m
2More than, more preferably 2.0-6.0g/m
2Scope.
(9) hydrophilicity-imparting treatment
After having implemented anodized, as required hydrophilicity-imparting treatment is implemented on the aluminium surface.In the method, in sodium silicate aqueous solution,, or carry out electrolytic treatments with support impregnation.(other processing (washing, sealing of hole))
After reason finishes throughout,, adopt nip rolls liquid to remove and adopt and spray the washing of carrying out in order not bring treating fluid into subsequent processing.Preferably after anodized, implementing sealing of hole handles.This sealing of hole is handled through dipping in the hydrothermal solution that contains hot water and inorganic salts or organic salt and is adopted water vapour to bathe and carry out.
Two, the formation of alkali soluble resins layer
On the version base of handling, be coated with the coating of alkali soluble resins layer and carry out drying, form the alkali soluble resins layer.
The alkali soluble resins layer composition with the dissolving of the solid component concentration of 2-50 weight %, disperse, be applied on the support aluminum substrate and carry out drying.The alkali soluble resins layer coating weight that on the support aluminum substrate, is coated with preferred dried weight usually is 0.5-1.0g/m
2Along with coating weight reduces, film strength reduces; Along with coating weight increases, film strength strengthens.
The alkali soluble resins layer composition is dissolved in the organic solvent, on the support aluminium plate, being coated with.As solvent used herein; Comprise acetone, methyl ethyl ketone, cyclohexane, ethyl acetate, dichloroethylene, tetrahydrofuran, toluene, glycol monoethyl ether, ethylene glycol monoethyl ether, glycol dimethyl ether, propylene glycol monomethyl ether, dihydroxypropane single-ether, diacetone, cyclohexanone, diacetone alcohol, ethylene glycol monomethyl ether acetate, ethyl cellosolve acetate, glycol monomethyl isopropyl ether, ethylene glycol monomethyl ether acetate, 3 one methoxypropanol, methoxymethoxy ethanol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol dimethyl ether, diethyl carbitol, propylene glycol methyl ether acetate, propylene glycol monoethyl ether acetate one 3 one methoxy propyl yl acetates, N, N dimethyl formamide, dimethyl sulfoxide (DMSO), Y one butyrolactone, methyl lactate, ethyl lactate etc.These solvents can separately or mix and use
Apparent in order to improve coating, in the alkali soluble resins layer of positive-working lithographic printing plate of the present invention, can add surfactant.
As the coating process of alkali soluble resins layer, can use the method for coating scraper (coating rod), the method for extrusion type coating machine, the method for ball coating machine (slide beald coater) etc., but be not limited to these.
Three, the formation of photographic layer
Be coated with the alkali soluble resins layer the version base on photosensitive coated layer coating and carry out drying, finally form positive-working lithographic printing plate of the present invention.
The photographic layer composition with the dissolving of the solid component concentration of 2-50 weight %, disperse, be applied to the version base that is coated with the alkali soluble resins layer and go up and carry out drying.In the common preferred dried weight of photographic layer coating weight is 0.5-1.0g/m
2Along with coating weight reduces, be used to obtain the exposure minimizing of image, but film strength reduces.Along with coating weight increases, increase with exposure, but film strength strengthens.
The photographic layer composition dissolves supplies to use in various organic solvents.As solvent used herein; Comprise acetone, methyl ethyl ketone, cyclohexane, ethyl acetate, dichloroethylene, tetrahydrofuran, toluene, glycol monoethyl ether, ethylene glycol monoethyl ether, glycol dimethyl ether, propylene glycol monomethyl ether, dihydroxypropane single-ether, diacetone, cyclohexanone, diacetone alcohol, ethylene glycol monomethyl ether acetate, ethyl cellosolve acetate, glycol monomethyl isopropyl ether, ethylene glycol monomethyl ether acetate, 3 one methoxypropanol, methoxymethoxy ethanol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol dimethyl ether, diethyl carbitol, propylene glycol methyl ether acetate, propylene glycol monoethyl ether acetate one 3 one methoxy propyl yl acetates, N, N dimethyl formamide, dimethyl sulfoxide (DMSO), Y one butyrolactone, methyl lactate, ethyl lactate etc.These solvents can separately or mix and use.
Apparent in order to improve coating, in the photographic layer of positive-working lithographic printing plate of the present invention, can add surfactant.
As the coating process of photographic layer, can use the method for coating scraper (coating rod), the method for extrusion type coating machine, the method for ball coating machine (slide beald coater) etc., but be not limited to these.
Four, the exposure and the processing of developing
Positive-working lithographic printing plate plate of the present invention is with for example carbon arc lamp, high-pressure mercury-vapor lamp, xenon lamp, metal halide lamp, fluorescent light, tungsten lamp, Halogen lamp LED, helium cadmium laser, argon laser, FD-YAG laser, He-Ne Lasers, semiconductor laser (350nm-450nm), carry out image exposure to photographic layer.After adopting these known in the past active rays to carry out image exposure,, can on aluminium plate support surface, form image through development treatment.
Behind the image exposure, through the method for developing the photographic layer and the alkali soluble resins layer of exposed portion being removed.Usual method is adopted in the development of the above-mentioned developer solution of employing of positive-working lithographic printing plate among the present invention; Under 0-60 ℃, preferred about 15-40 ℃ temperature; For example, the positive-working lithographic printing plate that exposure-processed is crossed impregnated in the developer solution, carries out with brush wiping etc.
Carried out the positive-working lithographic printing plate of development treatment like this, water wash water, the leacheate that contains surfactant etc., the lipoprotein liquid of not feeling that contains gum arabic or starch derivative etc. carry out aftertreatment.In the aftertreatment of photosensitive lithographic plate of the present invention, can various combinations be carried out in these processing uses.Galley through above-mentioned Processing of Preparation can make anti-brush property raising through adopting heat treated such as post-exposure processing, roasting.Lithographic plate through this Processing of Preparation is installed on the offset press, is used for the printing of multipage.
The present invention will be described below in conjunction with embodiment, but the present invention does not receive the qualification of these embodiment.
Embodiment 1
(1) making of positive-working lithographic printing plate
The curling aluminium volume for web-like (shape curls) of aluminium plate (support) of thick 0.30mm is fixed on the machine of seeing off.Surface treatment with 10% NaOH, down will see the aluminium plate that machine sees off continuously off at 70 ℃ and flood for 60 seconds from this, carry out etching after, after washing with flowing water, use 20%HN0
3Washing, washing neutralize.Under the condition of VA=12.7V, use sinusoidal wave alternately waveform electric current, in 1% aqueous solution of nitric acid with 300 coulombs/dm
2Anode the time electric weight it is carried out the electrolytic surface roughened.Measure its surfaceness, it is 0.6u m (Ra representes).
Then impregnated in 30% H
2SO
4In the WS, after carrying out 2 minutes crude removals under 55 ℃, at 33 ℃, 20%H
2SO
4In the WS, on the face of graining, dispose negative electrode, at current density 5A/dm
2Down, carry out anodic oxidation in 50 seconds, thickness is 2.7g/m
2In addition, the anodic oxide coating at the back side is about 0.5g/m at the central portion of aluminium plate at this moment
2, be about 1.0g/m in the end
2
Following primary coat is mixed with coating composition, stir down at 30 ℃.After about 5 minutes, find heating, react after 60 minutes, content is transferred in the other container that through adding 10000 weight portion methyl alcohol again, coating is used in the modulation primary coat.
(2) liquid composition is used in primary coat
Methyl alcohol 100 weight portions
Water 120 weight portions
Phosphoric acid (85% WS) 10 weight portions
3～methacryloxypropyl triethoxysilane, 25 weight portions
This aqueous coating is applied on the aluminium plate of above-mentioned processing and reaches 0.1g/m
2, carry out drying and reach 70 ℃ until the aluminium temperature, cool off then until the aluminium temperature and reach below 50 ℃.
(3) alkali soluble resins layer
N, dinethylformamide (DMF) 6 weight portions
Water 2 weight portions
Ethyl cellosolve 25 weight portions
Acryl resin (1) 1.5 weight portion
Blue 603 (Beijing Chemical Plant) of oil 0.07 weight portion
BYK-307 polyethoxylated dimethyl silicone copolymer
(BYK Chemie, Wallingford, CT, USA) 0.0035 weight portion
The structure of acryl resin (1) is following:
This aqueous coating is applied on the aluminium plate of above-mentioned processing and reaches 0.8g/m
2, carry out drying and reach 120 ℃ until the aluminium temperature, cool off then until the aluminium temperature and reach below 50 ℃.
On the alkali soluble resins coating that obtains like this, be coated with the positive-type photosensitive composition of following composition, make drying coated weight reach 1.2g/m
2, carry out drying and reach 120 ℃ until the aluminium temperature, cool off then until the aluminium temperature and reach below 50 ℃.
(3) photosensitive layer coating liquid composition
Linear phenolic resin BTB-24 (sky, Weihai becomes the chemical plant) 5.2 weight portions
1,2,3,-thrihydroxy-benzene condensation acetone resin PA-O (The Second Film Factory of Lucky Group) 1 weight portion
Photosensitizer P-3000 2.5 weight portions
(2.1.5 diazonium naphthoquinone sulphonate compounds, The Second Film Factory of Lucky Group)
Triazine B (The Second Film Factory of Lucky Group) 0.4 weight portion
Blue 603 (Beijing Chemical Plant) of oil 0.5 weight portion
Fluorine is surfactant FC-4432 (3M company) 0.03 weight portion
Ethyl cellosolve 100 weight portions.
Embodiment 2
Adopt with embodiment 1 same method and make positive-working lithographic printing plate, difference is that alkali soluble resin layer coating fluid composition is different, and the composition of alkali soluble resins layer is following:
N, dinethylformamide (DMF) 6 weight portions
Water 2 weight portions
Ethyl cellosolve 25 weight portions
PVB modified resin (Diversitec corporation, DT-5) 1.5 weight portions
Blue 603 (Beijing Chemical Plant) of oil 0.07 weight portion
BYK-307 polyethoxylated dimethyl silicone copolymer
(BYK Chemie, Wallingford, CT, USA) 0.0035 weight portion
The structural formula of DT-5 is following:
Embodiment 3
Adopt with embodiment 1 same method and make positive-type type lithographic plate, difference is that alkali soluble resin layer coating fluid composition is different, and the composition of alkali soluble resins layer is following:
N, dinethylformamide (DMF) 6 weight portions
Water 2 weight portions
Ethyl cellosolve 25 weight portions
Linear phenolic resin BTB29 resin (sky, Weihai becomes chemical industry company limited) 1.3 weight portions
Tertiary butyl phenol phenolics (SP-1077, second photographic film plant) 0.3 weight portion
Urethane resin 5715 (U.S. promise reputation company) 0.5 weight portion
Blue 603 (Beijing Chemical Plant) of oil 0.07 weight portion
BYK-307 polyethoxylated dimethyl silicone copolymer
(BYK Chemie, Wallingford, CT, USA) 0.0035 weight portion.
Embodiment 4
Adopt with embodiment 1 same method and make positive-type type lithographic plate, difference is that alkali soluble resin layer coating fluid composition is different, and the composition of alkali soluble resins layer is following:
N, dinethylformamide (DMF) 6 weight portions
Water 2 weight portions
Ethyl cellosolve 25 weight portions
CAB acetyl cellulose succinate (EASTMAN company) 1.5 weight portions
Blue 603 (Beijing Chemical Plant) of oil 0.07 weight portion
BYK-307 polyethoxylated dimethyl silicone copolymer
(BYK Chemie, Wallingford, CT, USA) 0.0035 weight portion.
Embodiment 5
Adopt with embodiment 1 same method and make positive-type type lithographic plate, difference is that the photosensitive layer coating liquid composition is different, and the composition of photographic layer is following:
Linear phenolic resin BTB-24 (sky, Weihai becomes the chemical plant) 5.2 weight portions
1,2,3,-thrihydroxy-benzene condensation acetone resin PA-O (The Second Film Factory of Lucky Group) 1.0 weight portions
Photosensitizer P-3000 (The Second Film Factory of Lucky Group) 1.5 weight portions
(2.1.5 diazonium naphthoquinone sulphonate compounds, The Second Film Factory of Lucky Group)
Photosensitizer PAC-NF 1.0 weight portions
(2.1.4 diazonium naphthoquinone sulphonate compounds, sky, Weihai becomes the chemical plant)
Triazine B (The Second Film Factory of Lucky Group) 0.4 weight portion
Blue 603 (Beijing Chemical Plant) of oil 0.5 weight portion
Fluorine is surfactant FC-4432 (3M company) 0.03 weight portion
Ethyl cellosolve 100 weight portions.
Embodiment 6
Adopt with embodiment 1 same method and make positive-type type lithographic plate, difference is that the photosensitive layer coating liquid composition is different, and the composition of photographic layer is following:
Linear phenolic resin BTB-24 (sky, Weihai becomes the chemical plant) 5.2 weight portions
Linear phenolic resin BTB-29 (sky, Weihai becomes the chemical plant) 0.5 weight portion
1,2,3,-thrihydroxy-benzene condensation acetone resin PA-O (The Second Film Factory of Lucky Group) 1 weight portion
Photosensitizer P-3000 (The Second Film Factory of Lucky Group) 2.0 weight portions
(2.1.5 diazonium naphthoquinone sulphonate compounds, The Second Film Factory of Lucky Group)
Triazine B (The Second Film Factory of Lucky Group) 0.4 weight portion
Blue 603 (Beijing Chemical Plant) of oil 0.5 weight portion
Fluorine is surfactant FC-4432 (3M company) 0.03 weight portion
Ethyl cellosolve 100 weight portions.
Comparative example 1
In comparative example 1, adopt with embodiment 1 same method aluminum substrate is coated with preceding processing, and direct photosensitive coated layer, obtain positive-working lithographic printing plate.The drying coated weight of photographic layer reaches 2.0g/m
2, carry out drying and reach 120 ℃ until the aluminium temperature, cool off then until the aluminium temperature and reach below 50 ℃.
The photosensitive layer coating liquid composition
Linear phenolic resin BTB-24 (sky, Weihai becomes the chemical plant) 5.2 weight portions
1,2,3,-thrihydroxy-benzene condensation acetone resin PA-O (The Second Film Factory of Lucky Group) 1 weight portion
Photosensitizer P-3000 (The Second Film Factory of Lucky Group) 1.8 weight portions
(2.1.5 diazonium naphthoquinone sulphonate compounds, The Second Film Factory of Lucky Group)
Triazine B (The Second Film Factory of Lucky Group) 0.4 weight portion
Blue 603 (Beijing Chemical Plant) of oil 0.5 weight portion
Fluorine is surfactant FC-4432 (3M company) 0.03 weight portion
Ethyl cellosolve 100 weight portions.
Comparative example 2
In comparative example 2, adopt with embodiment 1 same method aluminum substrate is coated with preceding processing, and direct photosensitive coated layer, obtain positive-working lithographic printing plate.The drying coated weight of photographic layer reaches 2.0g/m
2, carry out drying and reach 120 ℃ until the aluminium temperature, cool off then until the aluminium temperature and reach below 50 ℃.
The photosensitive layer coating liquid composition
Linear phenolic resin BTB-24 (sky, Weihai becomes the chemical plant) 4.2 weight portions
Tertiary butyl phenol phenolics (SP-1077, second photographic film plant) 1.0 weight portions
1,2,3,-thrihydroxy-benzene condensation acetone resin PA-O (The Second Film Factory of Lucky Group) 1.0 weight portions
Photosensitizer P-3000 (The Second Film Factory of Lucky Group) 1.6 weight portions
(2.1.5 diazonium naphthoquinone sulphonate compounds, The Second Film Factory of Lucky Group)
Triazine B (The Second Film Factory of Lucky Group) 0.4 weight portion
Blue 603 (Beijing Chemical Plant) of oil 0.5 weight portion
Fluorine is surfactant FC-4432 (3M company) 0.03 weight portion
Ethyl cellosolve 100 weight portions.
Method of testing
(1) solvent resistance detection method
The plate that the process said method obtains; Cut into the test-strips of 10cm*40cm; Carry out drop experiment with mixed solvent, mixed solvent is formed ethylene glycol monobutyl ether: isopropyl alcohol: methyl isopropyl Ketone=20:60:20 drips to dropper and to stop 30s on the test-strips; Behind the washing and drying, measure drop place density value with Ai Seli 528 type density appearance.Density is more little, and density loss is big more, and solvent resistance is poor more.
(2) light sensitivity test
The above-mentioned plate use thunder UV-CTP of section platemaking machine (UVP2616X) plate-making, light source is the 405nm semiconductor laser, drum type, rotating speed 900rpm.25mw begins from laser energy, increases progressively the 5mw exposure, and the maximum laser energy is 90mw.Develop with (prosperous prosperous 32CDN developing machine) in the back, developer solution adds water 1:4 dilution for " Hua Guang " PD-1 type (The Second Film Factory of Lucky Group), and 23 ℃ were developed for 30 seconds.When plain net is actual when being output as 50 ± 0.5%, used laser energy is the proper exposure energy, represents light sensitivity with laser energy here, and the big more light sensitivity of numerical value is low more, and the more little light sensitivity of numerical value is high more.
(3) development tolerance detects:
On UV-CTP platemaking machine (UVP2616X) platemaking machine; 1.3 times exposure according to the value of the above-mentioned optimum exposure that obtains is made public; The back is with the development (selecting 10s, 20s, 30s, 40s here) under 23 ℃ of different development times; Under this condition, (blank space is not kept on file, density OD value < 0.29 can to make plate reach request for utilization; Coating does not subtract film, density OD value on the spot>1.43; The mxm. of development time site reduction 3-99%) and the difference of minimum are the development tolerance of this plate.
(4) resolving power determination
With UV-CTP platemaking machine (UVP2616X) system, device resolution 2540dpi is to the space of a whole page make public (making 1-4 pixel negative line and land).Develop with prosperous prosperous 32CDN automatic processing machine.Developer solution adds water 1:4 dilution for " Hua Guang " PD-1 type (The Second Film Factory of Lucky Group), and 23 ℃ were developed for 30 seconds.With the negative line land reduce simultaneously the expression plate resolution, the more little representative resolution of pixel count is high more.
(5) press resistance rate is measured
Exposure and develop under suitable energy makes public and the processing and use magnificent light PG-1 type protection glue (second photographic film plant) that the space of a whole page is carried out the sealing processing of developing to plate.After plate is placed J4104D type sheet printing machine (Jing Dezhen printing apparatus), print test (fountain solution Wei Gela, Hang Hua printing ink).Behind printing 20000 seals, the abrasion condition of the space of a whole page 50% site before and after the contrast printing (using ICPLATE forme measuring instrument Test Network dot density), the more little representative press resistance rate that weares and teares is high more.
According to the said determination method, measure the impact of performance of positive UV-CTP lithographic plate plate of the present invention and see table 1.
Claims (10)
1. positive UV-CTP lithographic plate plate; Comprise the plate support; It is characterized in that: on support, be coated with the alkali soluble resins layer; On the alkali soluble resins layer, be coated with the positive-type photosensitive layer, said alkali soluble resins layer contains alkali soluble resins, adds resin and illuminating colour.
2. positive UV-CTP lithographic plate plate according to claim 1; It is characterized in that: described alkali soluble resins is employed in any one or more in the organic high molecular polymer of solubility in buck or the water or swellability; Weight average molecular weight range is between 1000-1000000, and the quality percentage composition of alkali soluble resins in the alkali soluble resins layer is 40-90%.
3. positive UV-CTP lithographic plate plate according to claim 1 and 2; It is characterized in that: described interpolation resin is polyurethane polymer, vinyl addition polymer, esters of acrylic acid addition polymer, acetals polymkeric substance or cellulosic polymer, and adding the quality percentage composition of resin in the alkali soluble resins layer is 10-60%.
4. positive UV-CTP lithographic plate plate according to claim 3; It is characterized in that: described illuminating colour is one or more in Victoria's ethereal blue, alkaline bright blue, solvent blue, crystal violet, methyl violet or the methylene blue, and the quality percentage composition of illuminating colour in the alkali soluble resins layer is 0.5-5%.
5. positive UV-CTP lithographic plate plate according to claim 1 is characterized in that: said alkali soluble resins layer coating weight is 0.5 ~ 1.5g/m
2
6. positive UV-CTP lithographic plate plate according to claim 1 and 2 is characterized in that: comprise in the described photographic layer that film-forming resin, interpolation resin, Photoactive compounds, light produce acid source and illuminating colour.
7. positive UV-CTP lithographic plate plate according to claim 6, it is characterized in that: said film-forming resin is a linear phenolic resin, weight-average molecular weight is 2000-10000, M
w/ M
nBe 1.5-20, the quality percentage composition of film-forming resin in photographic layer is 20-80%.
8. positive UV-CTP lithographic plate plate according to claim 6; It is characterized in that: described interpolation resin is one or more in polyurethane polymer, vinyl addition polymer, esters of acrylic acid addition polymer, acetals polymkeric substance, the cellulosic polymer, and adding the quality percentage composition of resin in photographic layer is 2-10%.
9. positive UV-CTP lithographic plate plate according to claim 6; It is characterized in that: said Photoactive compounds is the diazonium naphthoquinone sulphonate compounds; Its esterification parent is low molecule polyhydric phenols or linear phenolic resin, and the weight-average molecular weight of esterification parent is 2000-10000; M
w/ M
nBe 1.5-20, the hydroxy esterification rate is the 10-80% of initial hydroxyl, the quality percentage composition 10-40% of Photoactive compounds in photographic layer.
10. positive UV-CTP lithographic plate plate according to claim 6; It is characterized in that: described light produce acid source in the near ultraviolet band and the ultraviolet region compound of photolysis reactions can take place smoothly; The spectrum induction range is 350-420nm, light produce acid source in photographic layer the quality percentage composition be 0.1-5 weight %; Described illuminating colour is Victoria's ethereal blue, alkaline bright blue, solvent blue, crystal violet, methyl violet or methylene blue, and quality percentage the see amount of illuminating colour in the alkali soluble resins layer is 0.5-5%.
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| CN110187605A (en) * | 2019-05-23 | 2019-08-30 | 海宁市速美工贸有限公司 | Coating is imaged in heat-sensitive CTP plate |
| CN113954502A (en) * | 2021-10-26 | 2022-01-21 | 浙江康尔达新材料股份有限公司 | Photosensitive negative-working lithographic printing plate precursor and method for making lithographic printing plate by using the same |
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