Global Patent Index - EP 1164413 A1

EP 1164413 A1 2001-12-19 - High contrast photographic element containing a nucleator

Title (en)

High contrast photographic element containing a nucleator

Title (de)

Einen Keimbildner enthaltendes kontrastreiches photographisches Element

Title (fr)

Elément photographique à haut contraste contenant un agent de nucléation

Publication

EP 1164413 A1 (EN)

Application

EP 01201989 A

Priority

GB 0014329 A

Abstract (en)

The invention relates to an ultrahigh contrast photographic material comprising a support bearing a silver halide emulsion layer, containing a hydrazide nucleating agent in the emulsion layer or a hydrophilic colloid layer, characterised in that the nucleating agent of formula (I) comprises (a) two nicotinamide moieties, which may be the same or different, which are linked by a linking group, and (b) a hydrazide moiety linked to only one of the nicotinamide moieties. The nucleator of formula (I) may be in combination with a nucleator of formula (II) which comprises a dimeric molecule comprising two monomers linked by a linking group, each monomer of which (a) may be the same or different and (b) comprises a hydrazide moiety and a nicotinamide moiety. The photographic material provides unexpectedly good nucleation in the absence of, or with reduced amounts of, booster and in a developer whose pH is variable, and further with lower chemical spread and pepper fog. When the synthesis provides both a compound of formula (I) and (II), the products can be used directly without a separation step, providing a cost advantage.

IPC 1-7 (main, further and additional classification)

G03C 1/06

IPC 8 full level (invention and additional information)

G03C 1/06 (2006.01)

CPC (invention and additional information)

G03C 1/061 (2013.01); G03C 2001/108 (2013.01)

Citation (search report)

  • [A] US 5858610 A 19990112 - EZOE TOSHIHIDE [JP], et al
  • [A] PATENT ABSTRACTS OF JAPAN vol. 017, no. 631 (P - 1648) 22 November 1993 (1993-11-22)
  • [A] DATABASE WPI Section Ch Week 199427, Derwent World Patents Index; Class E19, AN 1994-223114, XP002178899

Designated contracting state (EPC)

BE DE FR GB

EPO simple patent family

EP 1164413 A1 20011219; EP 1164413 B1 20061102; DE 60124178 D1 20061214; DE 60124178 T2 20070906; GB 0014329 D0 20000802; JP 2002040588 A 20020206; JP 4402320 B2 20100120

INPADOC legal status


2014-02-27 [REG DE R119] APPLICATION DEEMED WITHDRAWN, OR IP RIGHT LAPSED, DUE TO NON-PAYMENT OF RENEWAL FEE

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- Effective date: 20131203

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