Desensitizer composition

Abstract: There is disclosed a desensitizing ink comprising an adduct produced by the addition of 4 to 70 mols of an alkylene oxide to 1 mol of an amine represented by the general formula (I ) where 40 mol % or more of said alkylene oxide are butylene oxide:

Description: BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a desensitizing ink for use in pressure sensitive manifold sheets and more particularly, to a desensitizing ink for use in such pressure sensitive manifold sheets which exhibits no blurring with water, a great versatility in various printings, an improved desensitizing effect and set-off property. Description of Related Art It has been long recognized that colored images can be produced by a reaction between a colorless electron-donating or proton-withdrawing organic compound (referred to as "coupler" hereinafter) and an electron-withdrawing or proton-donating compound (referred to as "developer" hereinafter). As products making use of this phenomenon in practice, one may mention pressure sensitive copy sheets (see, e.g., U.S.Patent Nos. 2,505,470; 2,505,489; 2,550,471; 2,548,366; 2,712,507; 2,730,456; 2,730,457; 3,418,250; 3,672,935), and thermosensitive copy sheets (see, e.g., Japanese Patent Examined Publication Nos. S.43-4160; S.43-7600; S.45-14039; U.S.Patent No.2,939,009). Moreover, a method for producing colored images by applying an ink containing a coupler to a sheet coated with a developer also has been known [German Patent Application (OLS) 1939962]. Developers having the properties as defined above include clays, phenol resins, metal salts of aromatic carboxylic acids and the like. Generally, in pressure sensitive manifold sheets, a combination of a layer having microcapsules containing said coupler and a developer layer has been used to produce colored images by superimposing one over the other, applying writing or typing pressures to the manifold sheets to collapse the microcapsules whereby the coupler and the developer will come to contact with each other. Generally, the developers are uniformly coated all over the surface of a support sheet in use. When the developer sheets should have certain parts where desired to have nothing recorded depending on the purpose of the use of pressure sensitive manifold sheets, an attempt has been employed to apply a desensitizing ink containing a desensitizer on parts by a printing machine. Desensitizing inks to be used for such purpose are described in detail, for example, in U.S.Patent Nos. 2,777,780: Japanese Patent Examined Publication Nos. S.44-27255; S.45-21448; S.46-22651; S.46-29546: Japanese Patent Unexamined Publication Laid-Open No.S.47-32915: Japanese Patent Examined Publication Nos. S.47-38201; S.48-4050: Japanese Patent Unexamined Publication Laid-Open No.S.48-6805: Japanese Patent Examined Publication Nos.S.49-4484; S.49-19647; S.49-23008; S.49-23850: Japanese Patent Unexamined Publication Laid-Open Nos. S.49-43708; S.49-72009; S.49-77709; S.49-77710; S.49-15513; S.49-83509; German Patent Application (OLS) Nos. 2343800; 2359079; 2361856: Japanese Patent Examined Publication No.S.58-38119; Japanese Patent Unexamined Publication Laid-Open Nos. S.63-74681; S.63-41184. GB-A-2 101 648 is directed to a pressure-sensitive microcapsular recording sheet which contains a particular benzhydrylsulfone colour former and an adduct formed by reacting an alkylene oxide with an amine such as C₈H₁₇NH-(CH₂)₂-NH₂. The adduct has the function of reducing staining of the surface of the recording sheet. GB-A-2 065 638 discloses an adduct formed between an amine and an alkylene oxide for desensitising an acidic colour developer. The amines from which the adducts are derived are similar to those disclosed in GB-A-2 101 648. Thus, the printing inks as mentioned above comprise generally desensitizers, pigments such as titanium dioxide, binders, and if necessary, diluents such as organic solvents. However, no desensitizing ink having excellent desensitizing effects on various developers and good off-set property has been obtained. In addition, the use of desensitizers having a higher water solubility may cause blurring with water, or conversely the use of water insoluble desensitizers may not achieve uniformly printed areas when employed in offset printing. That is, the opposite properties have been imparted. SUMMARY OF THE INVENTION It is an object of the present invention to provide a desensitizer having an adequate desensitizing ability and causing little practical difficulties and a copy sheet using such a desensitizer. That is, the present invention relates to a desensitizing ink for use in pressure sensitive manifold sheets which has an excellent print adaptability, remarkable desensitizing effect on various developers, good set-off property and no tendency to cause blurring with water. DETAILED DESCRIPTION OF PREFFERED EMBODIMENTS The present invention is directed to a desensitizing ink containing desensitizers, pigments and binders, using an alkylene oxide adduct of an amine compound represented by the general formula: More particularly, the present invention is directed to an adduct obtainable by the addition of 4 to 70 mols of an alkylene oxide to 1 mol of an amine represented by the general formula (I) where 40 mol% or more of said alkylene oxide is butylene oxide: wherein R₁ and R₂ both represent hydrogen atoms or both represent an alkyl group having 1 to 20 carbon atoms; when both R₁ and R₂ are hydrogen atoms, then R₃ represents a branched alkylene having 3 to 9 carbon atoms, or a substituted alkylene represented by the general formula (II) or (III): where m is 0 or 1, and n is an integer of 3 to 6, where ℓ is an integer of 1 to 4, when R₁ and R₂ both represent an alkyl group having 1 to 20 carbon atoms, then R₃ represents an alkylene group represented by the general formula (IV): -(CH₂) q (IV) where q is an integer of 1 to 12. In an embodiment, one may mention those in which R₁ and R₂ are hydrogen atoms and the branched alkylene is represented by the general formula (V): where r is an integer of 0 to 6. In a preferred embodiment, those in which the branched alkylene represented by the general formula (V) is selected from a group consisting of: or those in which both R₁ and R₂ in the general formula (I) are hydrogen atoms and the alkylene represented by the general formula (III) is: or those in which both R₁ and R₂ in the general formula (I) are hydrogen atoms, and alkylene group represented by the general formula (II) is: or those in which both R₁ and R₂ in the general formula (I) are alkyl group, and alkylene group represented by the general formula (IV) is -C₂H₄- or -C₃H₆- , or more particularly those in which both R₁ and R₂ are selected from a group consisting of CH₃-, C₂H₅-, C₃H₇-, C₄H₉-. The alkylene oxide adduct of an amine compound above-mentioned may be obtained by the addition of 1 mol of amine compound represented by the general formula (I) with 4 to 70 mols of alkylene oxide where 40 mol % or more of the alkylene oxide is butylene oxide. Although 40 mol % or more of the alkylene oxide must be butylene oxide, the remaining 60 % or less can be ethylene oxide, butylene oxide, propylene oxide, styrene oxide and the like, preferably, propylene oxide or butylene oxide. The adduct as defined above may be produced through the methods as disclosed in U.S.Patent No. 2,695,314, or No. 3,152,188 using amines represented by the general formula (I) and alkylene oxide. Examples of amine compound represented by the general formula (I) to be used preferably in the present invention include the following : I. those where in the general formula (I) both R₁ and R₂ are hydrogen atoms and R₃ is a branched alkylene having 3 to 9 carbon atoms, more particularly, R₃ is an alkylene having the general formula (V) such as : II. those where in the general formula (I) both R₁ and R₂ are hydrogen atoms and R₃ is represented by the general formula (III) such as : III. those where in the general formula (I), both R₁ and R₂ is an alkyl group having 1 to 20 carbon atoms and R₃ is an alkylene represented by the general formula (IV), more particularly, both R₁ and R₂ are alkyl having 1 to 20 carbon atoms and R₃ is an alkylene having 1 to 5 carbon atoms such as : IV. those where in the general formula (I), both R₁ and R₂ are hydrogen atoms and R₃ is represented by the general formula (II) such as : The aforementioned amines contain generally isomers and the like as impurities when they are commercially available. The impurity-containing ones may be put in use as they are, or a mixture of two or more amines may be employed. As adducts, one may mention the following : I a. adducts of amine compounds where in the general formula (I), both R₁ and R₂ are hydrogen atoms and R₃ is a branched alkylene group having 3 to 9 carbon atoms, are exemplified as follows (where BO and PO represent oxybutylene and oxypropylene, respectively): II a. adducts of amine compounds where in the general formula (I), both R₁ and R₂ are hydrogen atoms and R₃ is represented by the general formula (III) are exemplified as follows : III a. adducts of amine compounds where in the general formula (I), both R₁ and R₂ are alkyl and R₃ is an alkylene group represented by the general formula (IV), exemplified as follows : IV a. adducts of amine compounds where in the general formula (I), both R₁ and R₂ are hydrogen atoms and R₃ is represented by the general formula (II), are exemplified as follows : The aforementioned desensitizers may be employed alone, a mixture of two or more, or in combination with known desensitizers. Pigments used in the present invention claimed include white pigments such as titanium dioxide, barium sulfate, calcium carbonate, talc, kaolin, bentonite and the like. Binders used in the present invention claimed include natural or synthetic high molecular compounds such as rosin modified phenolic resin, ketone resin, polyamide resin, maleic resin, phenolic resin, epoxy resin, alkyd resin, melamine resin, urea resin, nitrocellulose, ethylcellulose, butyral resin, polyvinyl alcohol, gelatin, shellac and the like. A desensitizing ink of the present invention claimed may be used as the aforementioned composition alone, or if necessary, together with diluents such as organic solvents. Organic solvents include, for example, linseed oil, tung oil, soybean oil, cottonseed oil, methanol, ethanol, ethyl acetate, toluene, hexane, methyl ethyl ketone, methyl isobutyl ketone, polypropylene glycol, polybutylene glycol, paraffinic oil and the like. A desensitizing ink of the present invention claimed may contain, if necessary, waxes such as paraffin wax, microcrystalline wax, carnauba wax, offset-inhibitors such as starch, dextrin, ultraviolet-absorber,antioxidant, and the like. The present invention will be illustrated by the following Examples. It is not intended that the present invention is restricted by those Examples. Examples 1 to 2 and Comparative Examples 1 to 2 To 40 parts by weight of desensitizers shown in Table 1, 17 parts by weight of rosin-modified phenolic resin (Tamanol® T 135, manufactured by Alakawa Kagaku Co.) were added, and the whole was melted at a temperature of 150 °C. After the melt was cooled down to a temperature of 25 °C, 25 parts by weight of titanium dioxide and 18 parts by weight of white spindle oil were added to the melt. The resulting mixture was kneaded with a triple roller mill to produce desensitizing inks for use in offset and letterpress. Manifold sheets used in the test were the inner sheets of commercially-available pressure-sensitive manifold sheets (Fuji pressure-sensitive manifold sheets supplied by Fuji Shashin Film Co.). The ink was evaluated by the test where 3 g/m² of the desensitizing ink was printed on a sheet which was placed on a innersheet under a loading of 100 g/cm² for a week. An extent of the transfer of the ink to the inner sheet was evaluated as offset property. Moreover, a top sheet (from commercially-available Fuji pressure sensitive manifold sheets) was superimposed on the printed surface and then overall color development was effected with a supercalender to evaluate "desensitizing effect" and "uniformity" of the desensitizing effect. The results are shown in Table 2. (Results) Printing Machine Set-off Desensitizing Effect Uniformity Example 1 Offset ○ ○ ○ " Letterpress ○ ○ ○ 2 Offset ○ ○ ○ Comparative Example 1 Offset - - X " Letterpress ▵ ▵∼ ○ ▵∼ ○ 2 Offset ▵ ▵∼ ○ ▵ ○ : superior ▵ : less superior X : inferior Examples 3 to 17 and Comparative Examples 3 to 12 Desensitizing inks were prepared in the same manner as in Examples 1 to 2 except that adducts shown in Table 3 were used, and evaluated by the same procedure as in Examples 1 to 2. The results are shown in Table 4. As illustrated above, the desensitizing inks of the present invention claimed have excellent adaptability in printings, setoff property and desensitizing effect.

Claims: A desensitizing ink comprising an adduct obtainable by the addition of 4 to 70 mols of an alkylene oxide to 1 mol of an amine represented by the general formula (I) where 40 mol% or more of said alkylene oxide is butylene oxide: wherein R₁ and R₂ both represent hydrogen atoms or both represent an alkyl group having 1 to 20 carbon atoms; when both R₁ and R₂ are hydrogen atoms, then R₃ represents a branched alkylene having 3 to 9 carbon atoms, or a substituted alkylene represented by the general formula (II) or (III): where m is 0 or 1, and n is an integer of 3 to 6, where ℓ is an integer of 1 to 4, when R₁ and R₂ both represent an alkyl group having 1 to 20 carbon atoms, then R₃ represents an alkylene group represented by the general formula (IV): -(CH₂) q (IV) where q is an integer of 1 to 12. A desensitizing ink of claim 1 where said branched alkylene having 3 to 9 carbon atoms is represented by the general formula (V): where r is an integer of 0 to 6. A desensitizing ink of claim 2 where said branched alkylene represented by the general formula (V) is : A desensitizing ink of claim 2 where said branched alkylene represented by the general formula (V) is selected from a group consisting of: A desensitizing ink of claim 1 where both R₁ and R₂ in the general formula (I) are hydrogen atoms and said alkylene represented by the general formula (III) is: A desensitizing ink of claim 1 where both R₁ and R₂ in the general formula (I) are hydrogen atoms and said alkylene represented by the general formula (II) is: A desensitizing ink of claim 1 where both R₁ and R₂ in the general formula (I) are alkyl and said alkylene represented by the general formula (IV) is selected from a group consisting of : -C₂H₄- and -C₃H₆- . A desensitizing ink of claim 7 where both R₁ and R₂ are selected from a group consisting of : CH₃-, C₂H₅-, C₃H₇-, C₄H₉- . Use of a desensitizing ink as claimed in one or more of claims 1-8 in pressure-sensitive manifold sheets.

Inventors: FUCHIGAMI MITSURU, ISHIGURO MAMORU, TACHIZAWA SHINGO, FUCHIGAMI, MITSURU, ISHIGURO, MAMORU, TACHIZAWA, SHINGO
Applicants: MITSUBISHI PAPER MILLS LTD, MITSUBISHI PAPER MILLS, LTD.
Application year: 1989
Main classification: B41M5
IPC codes: B41M5