US2595916A - Light sensitive positive printing diazotype paper having a calendered surface - Google Patents

Light sensitive positive printing diazotype paper having a calendered surface Download PDF

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Publication number
US2595916A
US2595916A US22263A US2226348A US2595916A US 2595916 A US2595916 A US 2595916A US 22263 A US22263 A US 22263A US 2226348 A US2226348 A US 2226348A US 2595916 A US2595916 A US 2595916A
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US
United States
Prior art keywords
paper
diazotype
positive printing
sensitive positive
calendered
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US22263A
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English (en)
Inventor
Bartels Wilhelmus Hub Gerardus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chemische Fabriek L Van der Grinten NV
Original Assignee
Grinten Chem L V D
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Grinten Chem L V D filed Critical Grinten Chem L V D
Application granted granted Critical
Publication of US2595916A publication Critical patent/US2595916A/en
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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/52—Compositions containing diazo compounds as photosensitive substances

Definitions

  • the invention relates to light sensitive positive printing diazotype paper and a process for its manufacture
  • the conventional positive printing diazotype paper is manufactured as follows:
  • Suitable base paper is sensitized by coating it with an even layer of a liquid containing a diazo compound (for a so-called one component paper) and, if desired, in addition an azo coupling component (for a so-called two component paper), together with other substances, e. g. for improving its keeping quality, for decreasing the discoloration of the copies made, etc.
  • This layer of liquid is then dried on the surface of the paper.
  • the developer contains an azo coupling component, for a two component paper an alkaline reaction of the liquid or of the vapour used for the development suffices.
  • the object of the invention is to provide a diazotype paper for the positive printing process showing improved qualities.
  • Another object is to provide a diazotype paper for the positive printing process which after exposure yields copies of improved qualities.
  • the base paper is calendered before it is sensitized for the purpose of flattening it and of giving its surface a satinage, this calendering being conventional for most papers.
  • the sensitized paper In the manufacture of the sensitized paper according to this invention one may start with a conventional calendered base paper suitable for the manufacture of light sensitive positive printing diazotype paper. It is preferred, however, to start with base paper which has not yet been calendered; in this case the eventual copy shows considerably softer, i. e. more even, tones, particularly half-tones, while also the details of the print are sharper.
  • the base paper is sensitized and thereafter calendered.
  • the calendering can be done immediately after the sensitizing operation when the paper still contains large amounts of moisture, e. g. 10-16%. After or during the calendering operation this paper must be dried. It has been found, however, and surprisingly so, that it is also possible to calender the sensitized paper after drying, when it has only a moisture content of less than 6%; this amounts to a considerable simplification because in that practice it is no longer necessary to dry the paper after the calendering operation.
  • the calender may be arranged so as to form a part of the coating machine or it may be provided in the immediate vicinity of said machine; this, however, is not necessary.
  • Pinewood-cellulose base paper of a convgntional quality for making diazotype paper (for example of grammes per m is a non-calendered condition is coated with an excess of the following aqueous solution:
  • the paper is now dried within 30 seconds at a temperature of approximately 120 C. to a moisture-content of 4%. It is then calendered on a paper-calender with a pressure of 50 kilogrammes per centimetre and with a speed of 60 metres per minute. After this operation it is cut to sheets of foolscap size.
  • the sheets obtained are flatter and have a more beautiful satinage and show a greater keeping-quality than sheets obtained without calendering after sensitization, or even than sheets the base paper of which had been calendered in the conventional way before sensitization, that is to say between the papermaking and the sensitization operation.
  • the paper shows a better capacity of taking up the developing solution; the copies have a more beautiful satinage and are flatter than those obtained from sheets which have not been calendered after sensitization, even if the-base paper of these sheets had been subjected to the conventional calendering operation before sensitization.
  • the omission of the conventional calendering step before sensitization causes the half tones of the copies to be better, i. e. softer'and" more even.
  • Example 2 The printed copies are developed in an atmosphere of moist ammonia vapours. tages of the new sensitized sheets are the same as those'indicated in Example 1, while the advantages with respect to the copies are essentially the same. However, in so far as the flatness and the satinage of the copies are concerned, the advantages are relatively greater, while in so far as the ease of development is concerned the advantage is relatively smaller than in Example 1.
  • calenderin'g'after sensitization of the base paper yields certain advantages both when the base paper had alpara-diazodimethyl- The advanready been calendered and when it had not been; other advantages are only achieved when the calendering step according to the invention is carried out with a sensitized paper the base paper of which had not been calendered before sensitization. Naturally the extent to which the advantages are achieved depends on the nature of the base paper used.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
US22263A 1947-04-21 1948-04-20 Light sensitive positive printing diazotype paper having a calendered surface Expired - Lifetime US2595916A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL131747 1947-04-21

Publications (1)

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US2595916A true US2595916A (en) 1952-05-06

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US22263A Expired - Lifetime US2595916A (en) 1947-04-21 1948-04-20 Light sensitive positive printing diazotype paper having a calendered surface

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US (1) US2595916A (en))
NL (1) NL65231C (en))

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2743191A (en) * 1952-05-13 1956-04-24 Dick Co Ab Method for manufacturing transfer sheets for spirit duplication
US3472673A (en) * 1966-05-09 1969-10-14 Mead Corp Process for producing coating on paper base having electrophotographic properties
US3658570A (en) * 1969-12-09 1972-04-25 Larry L Crooks Imparting a satin like finish to one side of a fabric
US4865939A (en) * 1985-04-25 1989-09-12 Fuji Photo Film Co., Ltd. Process for preparation of heat-sensitive diazo microcapsule recording material using pressure applying apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB454665A (en) * 1935-04-30 1936-10-06 Halden & Co Ltd J Improvements in and relating to the production of light-sensitive diazo-type layers
GB467313A (en) * 1935-10-12 1937-06-15 Kalle & Co Ag Improvements in or relating to diazo type photographic printing paper
US2501874A (en) * 1946-06-12 1950-03-28 Gen Aniline & Film Corp Photographic diazo-sensitized glassine paper

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB454665A (en) * 1935-04-30 1936-10-06 Halden & Co Ltd J Improvements in and relating to the production of light-sensitive diazo-type layers
GB467313A (en) * 1935-10-12 1937-06-15 Kalle & Co Ag Improvements in or relating to diazo type photographic printing paper
US2216137A (en) * 1935-10-12 1940-10-01 Kalle & Co Ag Diazotype photographic printing paper
US2501874A (en) * 1946-06-12 1950-03-28 Gen Aniline & Film Corp Photographic diazo-sensitized glassine paper

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2743191A (en) * 1952-05-13 1956-04-24 Dick Co Ab Method for manufacturing transfer sheets for spirit duplication
US3472673A (en) * 1966-05-09 1969-10-14 Mead Corp Process for producing coating on paper base having electrophotographic properties
US3658570A (en) * 1969-12-09 1972-04-25 Larry L Crooks Imparting a satin like finish to one side of a fabric
US4865939A (en) * 1985-04-25 1989-09-12 Fuji Photo Film Co., Ltd. Process for preparation of heat-sensitive diazo microcapsule recording material using pressure applying apparatus

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Publication number Publication date
NL65231C (en))

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