138results about "Lithography" patented technology

IR-sensitive lithographic printing plate precursors provide a stable print-out image using a unique IR radiation-sensitive composition in an infrared radiation-sensitive image-recording layer. This IR radiation-sensitive composition includes: (1) a free radical initiator composition that comprises an electron-donating agent; (2) a free radically polymerizable composition; and (3) a color-changing compound that is represented by the Structure (I) having a conjugated carbon chain between the aromatic terminal groups. The compound also has a —SO2—R3 group wherein R3 represents alkyl, aryl or heteroaryl groups. After IR imaging, these precursors exhibit desirable printout images both fresh and after dark storage. The precursors can be developed off-press or on-press.

Provided is an on-press development type lithographic printing plate precursor having two or more maximal absorption wavelengths in a wavelength range of 760 nm to 900 nm, in which in a case where the on-press development type lithographic printing plate precursor is subjected to exposure to infrared having a wavelength of 830 nm at an energy density of 110 mJ / cm2, in a portion subjected to the exposure, a brightness change ΔL before the exposure and after storage subsequent to the exposure for 24 hours under conditions of 25°C and 70% RH is 3.0 or more. Also provided are a method of preparing a lithographic printing plate and a lithographic printing method in which the on-press development type lithographic printing plate precursor is used.

There is provided an on-press development type lithographic printing plate precursor including a support, and an image-recording layer provided on the support, in which the image-recording layer contains (1) or (2).(1) a borate compound represented by Formula (1) and an electron-accepting polymerization initiator(2) a borate compound represented by Formula (1a)in Formula (1) and Formula (1a), R1, R2, R3, and R4 each independently represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkenyl group, or a substituted or unsubstituted alkynyl group, and R1, R2, R3, and R4 may each independently have a ring structure. Provided that at least one of R1, R2, R3, or R4 is different from the other. M+ represents a cation. Ma+ represents an iodonium cation.

A lithographic printing plate precursor is disclosed including a support and a coating comprising a photopolymerisable layer including a polymerisable compound and a photoinitiator, characterized in that the coating comprises a hydrophilic adhesion promoting copolymer including at least one monomeric unit according to Formula I and at least one monomeric unit according to Formula II; and at least one group and / or moiety including a phosphor atom.

A negative-working lithographic printing plate precursor has a negative-working infrared radiation-sensitive image-recording layer that has a) two or more free radically polymerizable components; b) an initiator composition capable of generating free radicals; and c) one or more infrared radiation absorbing cyanine dyes. The a) two or more free radically polymerizable components comprise a combination of a urethane (meth)acrylate and a polyester (meth)acrylate, which together, comprise 75-100 weight % of all free radically polymerizable components. The weight ratio of the urethane (meth)acrylates to the polyester (meth)acrylates is from 90:10 to and including 35:65. The urethane (meth)acrylates comprise one or more urethane linkages and at least 4 acrylate or methacrylate ester groups. Each of the one or more polyester (meth)acrylates is free of a urethane linkage and is represented following structure (I). These precursors are less sensitive to ambient ozone and can be infrared radiation imaged and developed on-press during lithographic printing.

Provided are a lithographic printing plate precursor including a support, and an image recording layer on the support, in which the image recording layer contains organic particles containing an addition polymerization type resin that has a constitutional unit A having a hydrogen bond-donating site, and a content of the constitutional unit A in the addition polymerization type resin is greater than 20% by mass with respect to a total mass of the addition polymerization type resin; and a method of preparing a lithographic printing plate using the lithographic printing plate precursor.

IR-sensitive lithographic printing plate precursors provide a stable print-out image using a unique IR radiation-sensitive composition in an infrared radiation-sensitive image-recording layer. This IR radiation-sensitive composition includes: (1) a free radical initiator composition comprising a borate compound; (2) a free radically polymerizable composition; (3) an acid-sensitive color-changing compound that is represented by the Formula (I) identified herein; (4) an infrared absorber material; and a (5) color-changing compound of Formula (III) or Formula (IV) identified herein. After IR imaging, the exposed precursors exhibit desirable printout images especially in the 600-700 nm region of the electromagnetic spectrum and especially for observation using electronic sensing devices. The imaged precursors can be developed off-press or on-press.

Provided are an on-press development type lithographic printing plate precursor including: a support; and an image-recording layer on the support, in which the image-recording layer contains an electron-accepting polymerization initiator, an electron-donating polymerization initiator, an infrared absorber, and a salt compound A, and an HOMO value of an anion constituting a salt in the salt compound A is -6.2 eV or more and -4.4 eV or less, and a method of preparing a lithographic printing plate or a lithographic printing method using the on-press development type lithographic printing plate precursor.

The present invention provides an on-press developable lithographic printing plate precursor, and a method for producing a lithographic printing plate or a lithographic printing method using the on-press developable lithographic printing plate precursor. The on-press developable lithographic printing plate precursor comprises a support, an image recording layer, and an outermost layer in sequence. The image recording layer comprises an infrared absorber, an electron-donating polymerization initiator, and a polymerizable compound. The HOMO value of the infrared absorber and the HOMO value of the electron-donating polymerization initiator are 0.60 eV or less, and the outermost layer comprises a color-changing compound.

An on-press development type lithographic printing plate precursor includes a support, and an image-recording layer on the support, in which the image-recording layer contains an infrared absorber, a polymerization initiator, a polymerizable compound, and at least one compound selected from the group consisting of a compound represented by Formula (1) and a compound represented by Formula (2) (in Formulae (1) and (2), Ra1 and Ra2 represent an alkyl group, Rbi and Rbi represent an alkyl group, Rb2 and Rb4 represent an alkyl group, and EWG's each independently represent a hydrogen atom or an electron-withdrawing group, provided that at least one of the four EWG's in Formula (1) represents an electron-withdrawing group).

A positive-working lithographic printing plate precursor including a support and an image-recording layer formed on the support and consisting of a positive-working photosensitive resin composition, in which the positive-working photosensitive resin composition contains a compound having at least one electron-withdrawing group and at least one phenolic hydroxyl group in one molecule, an alkali-soluble resin, and an infrared absorber, and the electron-withdrawing group excludes a sulfonyl group; and a method of preparing a lithographic printing plate using the positive-working lithographic printing plate precursor.

A lithographic printing plate precursor has an aluminum substrate prepared using two anodization processes to provide an inner aluminum oxide layer having an average dry thickness of 300-3,000 nm and having a plurality of inner micropores having an average inner micropore diameter of <100 nm. An outer aluminum oxide layer is provided with a plurality of outer micropores having an average outer micropore diameter of 15-30 nm and a dry thickness of 30-650 nm. A hydrophilic layer is provided on the outer aluminum oxide layer having (1) a compound having an ethylenically unsaturated polymerizable group, an -OM group directly attached to a phosphorus atom, wherein M represents a hydrogen, sodium, potassium, or aluminum atom; and (2) one or more hydrophilic polymers having (a) a repeating unit comprising an amide group, and (b) a repeating unit having an -OM' group directly attached to a phosphorus atom, wherein M' represents a hydrogen, sodium, potassium, or aluminum atom. 2 An outer aluminum oxide layer is provided with a plurality of outer micropores having an average outer micropore diameter of 15-30 nm and a dry thickness of 30-650 nm. A hydrophilic layer is provided on the outer aluminum oxide layer having (1) a compound having an ethylenically unsaturated polymerizable group, an -OM group directly attached to a phosphorus atom, wherein M represents a hydrogen, sodium, potassium, or aluminum atom; and (2) one or more hydrophilic polymers having (a) a repeating unit comprising an amide group, and (b) a repeating unit having an -OM' group directly attached to a phosphorus atom, wherein M' represents a hydrogen, sodium, potassium, or aluminum atom.

A waterless planographic printing original plate which sequentially comprises at least a base material, a heat-sensitive layer and an ink-repellent layer in this order, wherein: the base material has a white layer or a white surface; and the heat-sensitive layer contains at least (a) an infrared absorbing dye that has a maximum absorption wavelength of 700 to 1,000 nm, (b) a dye that develops a color by acceptance of a proton, and (c) a proton-donating compound. Consequently, the present invention provides a waterless planographic printing original plate which enables the achievement of a high contrast between an image part and a non-image part by means of light exposure without requiring a special layer.

There are provided an on-press development type lithographic printing plate precursor including a support, and an image-recording layer on the support, in which the image-recording layer contains two or more electron-donating polymerization initiators and an electron-accepting polymerization initiator, and the two or more electron-donating polymerization initiators are borate compounds, and at least one of the two or more electron-donating polymerization initiators is a borate compound represented by Formula (1), in which, R1, R2, R3, and R4 each independently represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkenyl group, or a substituted or unsubstituted alkynyl group, and R1, R2, R3, and R4 may each independently have a ring structure, provided that at least one of R1, R2, R3, or R4 is different from the other, and M+ represents a cation.

A negative working lithographic printing plate precursor has a negative working infrared radiation sensitive image recording layer having a) two or more free radical polymerizable components; b) an initiator composition capable of generating free radicals; and c) one or more infrared radiation absorbing cyanine dyes. A) the two or more radically polymerizable components comprise a combination of a urethane (meth) acrylate and a polyester (meth) acrylate together making up 75-100% by weight of all the radically polymerizable components. The weight ratio of the urethane (meth) acrylate to the polyester (meth) acrylate is from 90: 10 to 35: 65. The urethane (meth) acrylate comprises one or more urethane linkages and at least 4 acrylate groups or methacrylate groups. The one or more polyester (meth) acrylates each do not contain a urethane bond and are represented by the following structure (I). These precursors are less sensitive to ambient ozone and can be imaged by infrared radiation and developed on-press during lithographic printing.

Provided is a method of setting a lithographic printing machine capable of reducing the amount of discarded printbooks produced during printing on the printing machine. According to the method, paper which has been used in the printing process of a printing press of a previous printing batch and comprises a first color bar is used; the method includes the step of exposing the second color bar at a stamp location different from the location of the first color bar.

Non-printing indicia on a plate formed in part or in whole from microstructures formed via exposure through openings in a masking layer form elevated or sunken structures that represent one or more alphanumeric signs, digital codes, or alignment marks. An isolated micro alignment mark may be used in conjunction with a ring of LEDs to show alignment by a characteristic illumination pattern to a high degree of accuracy. Non-printing indicia may be derived from imaging a plurality of supercells defined by a plurality of exposed pixels and unexposed pixels disposed within each supercell boundary. Each supercell may have a first number of exposed pixel clusters, each cluster having a second number of exposed pixels, adjacent clusters spaced apart by a third number of unexposed pixels, and a padding between the supercell boundary and a closest exposed pixel cluster defining a fourth number of unexposed pixels.

A lithographic printing plate precursor comprises a coating on a substrate having a hydrophilic surface or provided with a hydrophilic layer, the coating comprising a photopolymerizable layer comprising a polymerizable compound, a photoinitiator and an adhesion-promoting compound containing at least one thiol group and at least one group capable of adhering to the substrate.

A lithographic printing plate precursor is disclosed including a support and a coating comprising a photopolymerisable layer including a polymerisable compound and a photoinitiator, characterized in that the coating comprises a hydrophilic adhesion promoting copolymer including at least one monomeric unit according to Formula I and at least one monomeric unit according to Formula II; and at least one group and / or moiety including a phosphor atom;

The present invention provides an on-press-development-type planographic printing original plate which sequentially comprises a supporting body, an image recording layer and a overcoat layer in this order, wherein: the overcoat layer does not contain an inorganic compound, or alternatively, the content of inorganic compounds is more than 0% by mass but less than 1% by mass relative to the total mass of the overcoat layer; and the image recording layer contains an infrared absorbent, a polymerization initiator, a polymerizable compound and an oil agent. The present invention also provides: a method for producing a planographic printing plate with use of the above-described on-press-development-type planographic printing original plate; and a planographic printing method.

Provided is a lithographic printing plate precursor having an aluminum support and an image-recording layer formed on the aluminum support, in which the image-recording layer contains resin particles A that have an ethylenically unsaturated group and a compound B that has an ethylenically unsaturated group other than the resin particles A and has an ethylenically unsaturated bond valence of 1.5 mmol / g or more. Also provided are a method for preparing lithographic printing plate or a lithographic printing method using the lithographic printing plate precursor.

Provided is an on-press development type lithographic printing plate precursor having a support and an image-recording layer on the support, in which the image-recording layer contains an infrared absorber, a polymerization initiator, a polymerizable compound, and a color-developing substance precursor, and in a case where the image-recording layer is exposed to an infrared laser having a wavelength of 830 nm at an energy density of 110 mJ / cm2, a loss of ethylenically unsaturated bonds in an exposed area in the image-recording layer is 10% to 40% of ethylenically unsaturated bonds in a non-exposed area in the image-recording layer. Also provided is a method for preparing a lithographic printing plate or a lithographic printing method using the on-press development type lithographic printing plate precursor.

A lithographic printing plate precursor is disclosed including a support and a coating comprising a photopolymerisable layer including a polymerisable compound, a photoinitiator, and an infrared absorbing compound including a long chain linear or branched alkyl group.

A lithographic printing plate precursor including a support and an image-recording layer on the support, in which the image-recording layer contains a polymer A having a main chain containing two or more silicon atoms, and a hydrophilic group.

The present invention addresses the problem of providing a flexographic printing plate original plate that suppresses the occurrence of wrinkling in an infrared ablation layer and demonstrates good microcell reproducibility when made into a flexographic printing plate, as well as providing a method for manufacturing a flexographic printing plate using said flexographic printing plate original plate. This flexographic printing plate original plate has a support body, a photosensitive layer, an intermediate layer, and an infrared ablation layer, in this order. The intermediate layer includes a rubber component and a resin component, and the resin component includes at least one of an acrylic resin and a methacrylic resin.

The present invention addresses the problem of providing a positive lithographic printing plate precursor and a method for producing a lithographic printing plate, said positive lithographic printing plate precursor having good development discrimination and having good brush resistance and image portion scratch resistance. The present invention provides a positive lithographic printing plate precursor and a method for making a lithographic printing plate using the positive lithographic printing plate precursor. The positive lithographic printing plate precursor comprises: a support; and an image recording layer formed from a positive photosensitive resin composition on the support. The positive photosensitive resin composition contains: a compound having at least one electron withdrawing group and at least one phenolic hydroxyl group in one molecule; an alkali soluble resin; and an infrared absorbent, wherein the electron withdrawing group does not include a sulfonyl group.

A positive-working lithographic printing plate precursor including a support and an image-recording layer formed on the support and consisting of a positive-working photosensitive resin composition, in which the positive-working photosensitive resin composition contains a compound having at least one electron-withdrawing group and at least one phenolic hydroxyl group in one molecule, an alkali-soluble resin, and an infrared absorber, and the electron-withdrawing group excludes a sulfonyl group; and a method of preparing a lithographic printing plate using the positive-working lithographic printing plate precursor.

Provided is an on-press development type lithographic printing plate precursor having a support, an image-recording layer, and an outermost layer in this order, in which the image-recording layer contains an infrared absorber, an electron-accepting polymerization initiator, and a polymerizable compound, LUMO of the electron-accepting polymerization initiator - LUMO of the infrared absorber is 0.45 eV or more, and the outermost layer contains a discoloring compound. Also provided is a method of preparing a lithographic printing plate and a lithographic printing method in which the on-press development type lithographic printing plate precursor is used.