Abstract:
The present invention provides a method for reproducing continuous tone images by means of a thermal head. The method involves the image-wise heat transfer of a reducing agent from a donor element to a receiving layer of a receiving element. The receiving element contains a thermoreducible silver source such as e.g. silver behenate. The process of the present invention provides high density images with multiple intermediate density levels.
Abstract:
The present invention provides a thermal imaging process using (i) a donor element comprising on a support having a thickness of 3-10 .mu.m a donor layer comprising a binder, a thermotransferable reducing agent capable of reducing a silver source to metallic silver upon heating and particles protruding from the surface of said donor layer and (ii) a receiving element comprising on a support a receiving layer comprising a silver source capable of being reduced by means of heat in the presence of a reducing agent, said thermal imaging process comprising the steps ofbringing said donor layer of said donor element into face to face relationship with said receiving layer of said receiving element,image-wise heating a thus obtained assemblage, thereby causing image-wise transfer of an amount of said thermotransferable reducing agent to said receiving element in accordance with the amount of heat supplied by said thermal head andseparating said donor element from said receiving element.The obtained images have a uniform density and the donor element for use in the above method shows an improved storage stability.
Abstract:
The present invention provides a donor element comprising on a support a donor layer comprising a binder, a thermotransferable reducing agent capable of reducing a silver source to metallic silver upon heating and a thermotransferable dye. When such a donor element is used in a thermal transfer printing process in conjunction with a receiving element having a receiving layer that contains a thermoreducible silver source, an image of a neutral black tone and having a high optical density is obtained.
Abstract:
A thermal head printer for printing but not perforating a substantially light-insensitive thermographic material, the thermal printer comprising: a transport system having a transport direction, n thermal heads, where n is an integer, each of the thermal heads comprising an array of substantially rectangular energizable heating elements, the heating elements having a length Ln in the transport direction and a pitch Pn between adjacent heating elements, and a means for supplying electrical energy to each of the substantially rectangular energizable heating elements in at least one of the thermal heads, the transport system being capable of transporting the light-insensitive thermographic material in contact or proximity with at least one of the thermal heads, wherein at least one of the thermal heads comprises heating elements for which Ln/Pn is between 0.25 and 0.88; a first process for printing a substantially light-insensitive thermographic material with the above-described thermal head printer; a second process for printing a substantially light-insensitive thermographic material at different printing speeds with a thermal head comprising heating elements without significant variation in image tone, wherein the length of the heating elements in the transport direction of the substantially light-insensitive thermographic material decreases with decreasing printing speed; and a third process for printing a substantially light-insensitive thermographic material at different printing speeds with a different thermal head at each printing speed without significant variation in image tone, wherein each of said different thermal heads comprises heating elements with a different length in the transport direction of the substantially light-insensitive thermographic material and the length of the heating elements in the transport direction of the substantially light-insensitive thermographic material decreases with decreasing printing speed.
Abstract:
A monosheet black and white substantially light-insensitive thermographic recording material comprising a thermosensitive element and a support, the thermosensitive element containing one or more substantially light-insensitive organic silver salts, one or more reducing agents consisting of one or more 1,2-dihydroxybenzene-compounds in thermal working relationship therewith and a binder, wherein the molar ratio of molar hydroxy-equivalents of the 1,2-dihydroxybenzene compounds to molar silver-equivalents of the substantially light-insensitive organic silver salts is between 1.2 and 6.0; the 1,2-dihydroxybenzene-compounds have a —(CH═CH)nR group in the 4 position wherein n is zero or an integer and R is a substituent with a Hammett &sgr;p constant >0.35 and
Abstract:
A recording material comprising a support, a thermosensitive element and a protective layer therefor, the thermosensitive element comprising a substantially light-insensitive organic silver salt, an organic reducing agent therefor in thermal working relationship therewith and a binder, wherein the thermosensitive element further comprises in reactive association with the substantially light-insensitive organic silver salt and the organic reducing agent a substituted, exclusive of groups having an exclusively electron withdrawing character, or unsubstituted compound with an unsaturated 5-membered heterocyclic ring annulated with an aromatic ring system, the ring consisting of nitrogen and carbon atoms with at least one of the nitrogen atoms having a hydrogen atom and none of the carbon atoms being directly linked to a sulfur atom or being part of a carbonyl-group; a production process therefor and a thermal image recording process utilizing the recording-material.
Abstract:
A thermal printing head comprising an outermost protective layer and a coating on the outermost surface of the outermost protective layer, wherein the coating comprises a hydrolyzed silane, the silane having the general formula: SiR.sup.1 R.sup.2 R.sup.3 R.sup.4 wherein R.sup.1, R.sup.2 and R.sup.3 are independently a C1 to C4 alkoxy group, a substituted C1 to C4 alkoxy group, bromine or chlorine; and R.sup.4 is a C1 to C4 alkyl group; a substituted C1 to C4 alkyl group, a C1 to C4 alkoxy group or a substituted C1 to C4 alkoxy group; a coating process therefor; and a thermographic printing process utilizing said coated thermal printing head.
Abstract translation:一种热敏打印头,包括最外面的保护层和在最外面保护层的最外表面上的涂层,其中涂层包含水解硅烷,具有以下通式的硅烷:SiR 1 R 2 R 3 R 4,其中R 1,R 2和R 3独立地为C 1至C 4 烷氧基,取代的C1至C4烷氧基,溴或氯; R4为C1〜C4烷基; 取代的C1至C4烷基,C1至C4烷氧基或取代C1至C4烷氧基; 一种涂层工艺; 以及利用所述涂覆的热敏打印头的热成像印刷工艺。
Abstract:
Receiving element for use according to transfer printing, comprising on a support a receiving layer comprising a silver source, capable of being reduced by means of heat in the presence of a reducing agent, a binder and a stabilizer selected from the group of benzotriazoles, heterocyclic mercaptanes, sulphinic acids, 1,3,4-triazo-indolizines, 1,3-dinitroaryl compounds, 1,2,3-triazoles, phthalic acids and phthalic acid derivatives.The receiving element provides images with higher stability at elevated temperatures and upon exposure to light.
Abstract:
A thermosensitive recording material suited for use in direct thermal imaging by means of an information-wise energized heating element, said recording material containing a thermosensitive recording layer of which the optical density is changed by heat, characterized in that said recording layer is coated with a protective transparent resin layer essentially consisting of a polycarbonate or copolycarbonate derived from one or more bisphenols, wherein at least 25 mole % of said bisphenols consists of a bis-(hydroxyphenyl)-cycloalkane corresponding to following general formula (I): ##STR1## wherein: each of R.sup.1, R.sup.2 , R.sup.3, and R.sup.4 (same or different) represents hydrogen, halogen, a C.sub.1 -C.sub.8 alkyl group, a substituted C.sub.1 -C.sub.8 alkyl group, a C.sub.5 -C.sub.6 cycloalkyl group, a substituted C.sub.5 -C.sub.6 cycloalkyl group, a C.sub.6 -C.sub.10 aryl group, a substituted C.sub.6 -C.sub.10 aryl group, a C.sub.7 -C.sub.12 aralkyl group, or a substituted C.sub.7 -C.sub.12 aralkyl group, and X represents the atoms necessary to complete a 5- to 8-membered alicyclic ring, which either carries at least one C.sub.1 -C.sub.6 alkyl group or at least one 5- or 6-membered cycloalkyl group, or carries a fused-on 5- or 6-membered cycloalkyl group.
Abstract:
A thermal imaging process is provided using (i) a donor element comprising on a support a donor layer comprising a binder, a thermotransferable reducing agent capable of reducing a silver source to metallic silver upon heating and a thermotransferable toning agent and (ii) a receiving element comprising on a support a receiving layer comprising a silver source capable of being reduced to metallic silver by means of heat in the presence of a reducing agent, said thermal imaging process comprising the steps ofbringing said donor layer of said donor element into face to face relationship with said receiving layer of said receiving element,image-wise heating a thus obtained assemblage preferably by means of a thermal head, thereby causing image-wise transfer of an amount of said thermotransferable reducing agent to said receiving element in accordance with the amount of heat supplied andseparating said donor element from said receiving element.Images having a neutral grey tone can be obtained according to this method. The present invention further provides a donor element for use in the above method.