Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
  • B41M5/165—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components characterised by the use of microcapsules; Special solvents for incorporating the ingredients
  • B41M5/1655—Solvents
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S428/00—Stock material or miscellaneous articles
  • Y10S428/914—Transfer or decalcomania
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
  • Y10T428/2984—Microcapsule with fluid core [includes liposome]

Definitions

• This invention relates to pressure-sensitive copying systems of the kind in which an initially colourless colour-former held in microcapsules is reacted, upon rupturing of the microcapsules by an applied pressure, with a co-reactant material to form distinctive coloured marks.
• Such systems will be referred to hereinafter as systems of the kind defined above.
• Such systems can be of the type in which the microcapsules are carried on one surface of a transfer sheet, referred to as a CB (coated back) sheet and the coreactant material is carried on one surface of a record sheet, referred to as a CF (coated front) sheet, or can be of the autogeneous type in which the microcapsules and the co-reactant material are carried on the same surface ofa single sheet.
• CB coated back
• CF coated front sheet
• CB sheets carry a coating of microcapsules, which may be separate or in capsular units, i.e., clusters of capsules, each microcapsule comprising a wall of hydrophilic colloid material such as gelatin, containing a colourless, chromogenic material (colour-former) of basic reactant chemical properties which in use contacts and is coloured by a co-reactant material, such as attapulgite clay, acid treated montmorillonite clay, or particles of an oil-soluble, acidic phenolic polymeric material (generally in combination with kaolin clay), carried by a CF sheet, to provide distinctive coloured marks on the CF sheet.
• a co-reactant material such as attapulgite clay, acid treated montmorillonite clay, or particles of an oil-soluble, acidic phenolic polymeric material (generally in combination with kaolin clay) carried by a CF sheet, to provide distinctive coloured marks on the CF sheet.
• Such contact and colouration can be caused by rupture of microcapsule
• microcapsules and capsular units are well known, as are various methods of coating microcapsules and capsular units on to a base sheet to provide a CB sheet and coating a coreactant material on to a base sheet to provide a CF sheet, and such methods will not therefore be described in detail herein.
• the internal phase of a microcapsule that is the material within the microcapsule wall, comprises one or more.
• colour-formers which are in the nature of dye substances, typically crystal violet lactone (CVL) and benzoyl leuco methylene blue (BLMB), or 3,3-bis (dialkyl indolyl) phthalides, or 3-dialkylamino- 6-alkyl- 7-alkylamino fluoranes, or 3dialkylamino-7- dialkylamino fluoranes.
• These colour-formers are dissolved in a solvent, typically hydrogenated terphenyl or mono isopropyl bi-phenyl, and diluted with, for example, kerosene.
• the dye substances CVL and BLMB are normally used together, since CVL is effective to provide a rapid colouration and BLMBis effective to provide a lasting colouration, on reaction with commonly used co-reactant materials such as those mentioned above.
• the two principal tests being the calendar intensity Cl test and the smudge test.
• Other tests which are used are windowfading, office-fading and ream decline tests. All of these tests are well-known and will not therefore be described in detail herein. It is sufficient to state that the CI test is a measure of print intensity, that is the distinctiveness of the mark produced, and the result is expressed as a percentage, the lower the percentage the better the print intensity, and that the smudge test is a measure of resistance of the CB sheet to accidental rupture of microcapsules, the result being expressed as a number less than 100, the higher the number the better the CB sheets resistance to accidental microcapsule rupture.
• the window-fading and office-fading tests measure the print intensity after exposure to sunlight and artificial light, respectively, for various periods of time, while the ream decline test measures the initial print intensity obtained with sheets which have been stored in the ream for various periods.
• the present invention is particularly concerned with the internal phase of the microcapsules used in pressure-sensitive copying systems of the kind defined above.
• a sheet for use in a pressure-sensitive copying system comprises a base sheet carrying a coating of the microcapsules, each microcapsule containing an organic, initially colourless,
• Dimethyldibenzylbenzenes approx. 35 to 40%
• Trimethyldibenzylbenzenes approx. 10% approx. 99%
• Lipinol T has a very low level of toxicity in various mammalian species, the lethal dose being in excess of 20 g/kg. Thus, Lipinol T presents no toxic hazard to man under normal conditions when used as the solvent in the internal phase of pressure-sensitive copying system microcapsules.
• the preferred dibenzylbenzenes mixture has the following advantages: cheapness, better initial print intensity (CI test) for a given CB sheet coating weight when used with a CF sheet having an oil-soluble acidic phenolic polymeric material/kaolin clay coating; high colour-former solubility, thus allowing high dilution; slower fade rate with the windowfading test; less smell both during manufacture and from the manufactured CB sheet. Further the preferred mixture has no adverse effects with regard to the officefading and ream decline tests.
• the preferred dibenzylbenzenes mixture has a viscosity between 35 and 45 c? at 20C; a density of 1.0 to 1.04 g/ml; a distillation range at 20 mm Hg of 240 to 260C and a flash point of about 180C.
• the preferred dibenzylbenzenes mixture is a suitable solvent for many other colour-formers which are used in pressure-sensitive copying systems, and specifically for:
• a control CB sheet was produced by coating microcapsules containing a standard internal phase comprising hydrogenated terphenyl as the solvent, kerosene as the diluent, and both CVL and BLMB as colourformers, on to a base sheet with a coating weight of approximately 65 g/m
• the ratio of solvent to diluent was 4:] w/w.
• composition of the Lipinol T is given by the suppliers, Huls (U.K.) Ltd as follows:
• a sheet for use in a pressure-sensitive copying system comprising a base sheet carrying a coating of the microcapsules, each microcapsule containing an organic, initially colourless, colour-former, dissolved in a solvent which includes a mixture of dibenzylbenzenes of the general formula where R to R are selected from the group comprising hydrogen, alkyl groups containing less than 5 carbon atoms or alkaryl groups containing 7 or 8 carbon atoms.
• Trimethyldibenzylbenzenes approx. 10% approx. 99%
• the balance consisting of impurities of higher molecular weight.

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• Color Printing (AREA)

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Citations (2)

• 1972
  • 1972-01-20 GB GB278572*[A patent/GB1361638A/en not_active Expired
  • 1972-09-11 US US287714A patent/US3865613A/en not_active Expired - Lifetime
  • 1972-09-14 CA CA151,725A patent/CA966306A/en not_active Expired
  • 1972-09-15 DE DE2245785A patent/DE2245785A1/de active Pending
  • 1972-09-19 FI FI2578/72A patent/FI57071C/fi active
  • 1972-09-19 NL NL7212663.A patent/NL167121C/xx not_active IP Right Cessation
  • 1972-09-21 DK DK466172AA patent/DK130340B/da not_active IP Right Cessation
  • 1972-09-21 BR BR6566/72A patent/BR7206566D0/pt unknown
  • 1972-09-21 AT AT809872A patent/AT322577B/de active
  • 1972-09-22 JP JP7294683A patent/JPS4841816A/ja active Pending
  • 1972-09-22 FR FR7233669A patent/FR2154207A5/fr not_active Expired
  • 1972-09-22 IT IT7270008A patent/IT980999B/it active
  • 1972-09-22 AR AR244240A patent/AR194275A1/es active
  • 1972-09-22 BE BE789190A patent/BE789190A/fr not_active IP Right Cessation
  • 1972-09-22 CH CH1387972A patent/CH560110A5/fr not_active IP Right Cessation

Patent Citations (2)

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