US1762935A - Antiabrasion photographic coating - Google Patents

Antiabrasion photographic coating Download PDF

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Publication number
US1762935A
US1762935A US341195A US34119529A US1762935A US 1762935 A US1762935 A US 1762935A US 341195 A US341195 A US 341195A US 34119529 A US34119529 A US 34119529A US 1762935 A US1762935 A US 1762935A
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United States
Prior art keywords
coating
antiabrasion
photographic
photographic coating
over
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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
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US341195A
Inventor
Samuel E Sheppard
James G Mcnally
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Eastman Kodak Co
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Eastman Kodak Co
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Priority to US341195A priority Critical patent/US1762935A/en
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    • 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
    • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
    • G03C1/7614—Cover layers; Backing layers; Base or auxiliary layers characterised by means for lubricating, for rendering anti-abrasive or for preventing adhesion
    • 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
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/162—Protective or antiabrasion layer

Definitions

  • an antiabrasion coating commonly known as an over-coating for' the photographic emulsion to prevent or reduce abrasion markings thereon.
  • Gelatin has been widely used for this purpose especially on gelatino-silver halide emulsions, but the insolubility of the dried gelatin is uch in the aqueous developing solution that 1t resists the diffusion of the developer. This is especially true with X- ray emulsions where the over-coating must be 'of relatively considerable thickness in order to protect the delicateemulsion which is particularly susceptible to abrasion. Inthis instance the thickness of the over-coating is such that the rate of development is appreciably reduced.
  • an over-coating for the emulsion is made from ous, lass-clear, film which. is strong and solution.
  • anover-coating-of poly vinyl alcohol or oxy-ethylene when applied in the manner above described and subsequently dried, dissolves readily in water or the aqueous developing solution and thus does n ot offer resistance to the diffusion ofthe a synthetic product in theform of a continuv a transparent support, a layer of sensitized readiy soluble in anl aqueous developing veloper so'that the time of developing may be appreciably reduced.
  • 1 is a transparent support such as cellulosic material
  • 2 is a sensitized photographic emulto the back ofthe Celluloid support to prevent curling.

Description

'.June 1o, 1930.
SIE. sH'EPPARD Er Al.r ANTIABRASIONv PHOTOGRPHIC COAT'ING' Filed Feb. 19. v1929 Sens/'fl ed conf/gg 2 INV E ATTORNEY Patented June 10, 1930 UNITED STATES PATENT olfr'lcEI SAMUEL E. SHEPPARD AND JAMES G. McNAL-LY, OF ROCHESTER, NEW YORK, ASSIGN'- ORS TO EASTMAN KODAK COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK ANTIABRASION PHOTOGRAPHIC COATIIIN'G' Application led February 19, 1929. Serial No. 341,195.
This invention relates to photographic films and plates and more particularly to anti-abrasion coatings therefor.
In connection with many types of photographic materials it is customary to provide an antiabrasion coating commonly known as an over-coating for' the photographic emulsion to prevent or reduce abrasion markings thereon. Gelatin has been widely used for this purpose especially on gelatino-silver halide emulsions, but the insolubility of the dried gelatin is uch in the aqueous developing solution that 1t resists the diffusion of the developer. This is especially true with X- ray emulsions where the over-coating must be 'of relatively considerable thickness in order to protect the delicateemulsion which is particularly susceptible to abrasion. Inthis instance the thickness of the over-coating is such that the rate of development is appreciably reduced.
In accordance with the present invention an over-coating for the emulsion is made from ous, lass-clear, film which. is strong and solution. Reference is made to the accompanying drawing, the single figure of which illustrates in perspective and on an enlarged scale a piece of film involving my invention, an edge of the film being shown in section.
We have found that poly vinyl alcohol or Oxy-ethylene as prepared by H.- Staudinger (Ber. 59, p. 3069, (1926) and W. O. Herrmann and W. I-Iaehnel (Ber. 60, p. 1658, (1927) may be used with ladvantage to form an anti-abrasion coating. As a specific example of this use, a solution of this ma terial in water at 10% 'concentration c'an be n coated in known-manner,'sixnilar to the coatmg of starch, sizes, and the like, which protects the emulsion from shearing, stresses,-
abrasions and the like. Unlike an over-coating of gelatin, anover-coating-of poly vinyl alcohol or oxy-ethylene when applied in the manner above described and subsequently dried, dissolves readily in water or the aqueous developing solution and thus does n ot offer resistance to the diffusion ofthe a synthetic product in theform of a continuv a transparent support, a layer of sensitized readiy soluble in anl aqueous developing veloper so'that the time of developing may be appreciably reduced.
In'addition to this property of solubility I an over-coating of the material of the present invention, is continuous," glass-clear, highly resistant to abrasion, and strong even when applied as a thin protective film to a photographic emulsion.
In order to illustrate one form in which the invention may be utilized reference is made to the accompanying drawing wherein 1 is a transparent support such as cellulosic material; 2 is a sensitized photographic emulto the back ofthe Celluloid support to prevent curling. A
What'we clalm 1s: l 1. An artlcle of manufacture comprising vlayer formed from a solution in water of poly vinyl alcohol at a concentration of the order of 10%- signedaatochester, New York, this 13th'v L E; SHEPPARD.
day'of February, 1929. l
- SAMUE .TABLES G. MCNALLY.
US341195A 1929-02-19 1929-02-19 Antiabrasion photographic coating Expired - Lifetime US1762935A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2459266A (en) * 1941-07-08 1949-01-18 Photo Positive Corp Article for reproducing drawings on blanks
US2563469A (en) * 1947-02-18 1951-08-07 Du Pont Light sensitive elements for color photography
US2823122A (en) * 1951-06-30 1958-02-11 Polaroid Corp Photographic silver halide transfer process and the print-receiving products useful in connection therewith
US3129096A (en) * 1960-01-27 1964-04-14 Du Pont Photographic negatives and their preparation
US3870521A (en) * 1972-12-15 1975-03-11 Gaf Corp Photographic overcoat composition of an alkenyl half ester of starch
US4288531A (en) * 1978-12-20 1981-09-08 Eastman Kodak Company Imaging elements
US5108869A (en) * 1991-01-18 1992-04-28 Stone Jeffrey A Diazo reprographic paper with substantially transparent, flexible polymeric sheet protective layer

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2459266A (en) * 1941-07-08 1949-01-18 Photo Positive Corp Article for reproducing drawings on blanks
US2563469A (en) * 1947-02-18 1951-08-07 Du Pont Light sensitive elements for color photography
US2823122A (en) * 1951-06-30 1958-02-11 Polaroid Corp Photographic silver halide transfer process and the print-receiving products useful in connection therewith
US3129096A (en) * 1960-01-27 1964-04-14 Du Pont Photographic negatives and their preparation
US3870521A (en) * 1972-12-15 1975-03-11 Gaf Corp Photographic overcoat composition of an alkenyl half ester of starch
US4288531A (en) * 1978-12-20 1981-09-08 Eastman Kodak Company Imaging elements
US5108869A (en) * 1991-01-18 1992-04-28 Stone Jeffrey A Diazo reprographic paper with substantially transparent, flexible polymeric sheet protective layer

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