公开(公告)号：CA2031847A1

公开(公告)日：1991-06-13

申请号：CA2031847

申请日：1990-12-10

Applicant: HOECHST AG

Inventor： GASCHLER OTFRIED ,  ELSAESSER ANDREAS ,  MOHR DIETER ,  FRASS HANS W

IPC: G03F7/004 ,  G03F7/022 ,  G03F7/20 ,  G03F7/38 ,  G03C5/18

Abstract: A process for producing negative copies is disclosed in which a light-sensitive or radiationsensitive recording material comprising a layer support and a normally positive-working lightsensitive or radiation-sensitive layer applied thereto is irradiated imagewise, thermally treated, irradiated overall and then developed with an alkaline developer. Thermal treatment is carried out with water or with an aqueous solution, at temperatures in the range from about 50 to 100.degree.C, preferably from 60 to 90.degree.C, within a period of time varying between about 1 second and 5 minutes, preferably between 5 seconds and 1 minute, overall irradiation is performed on the optionally still hot recording material and development is thereafter carried out within a period of time varying between about 10 seconds and 2 minutes, preferably between 15 seconds and 1 minute. The process can be carried out according to the customary procedure known in the practice of positive processing, and results in perfect printing stencils.

公开(公告)号：CA2000052A1

公开(公告)日：1990-04-08

申请号：CA2000052

申请日：1989-10-02

Applicant: HOECHST AG

Inventor： ELSAESSER ANDREAS ,  GASCHLER OTFRIED ,  MOHR DIETER

IPC: G03F7/004 ,  G03F7/022 ,  G03F7/105 ,  H01L21/027 ,  G03C1/52

Abstract: The invention relates to a radiation- or photosensitive mixture and to a radiation-sensitive copying material produced from said mixture, comprising: A) a 1,2-quinonediazide and/or a combination of 1. a compound forming a strong acid under the action of actinic radiation and 2. a compound having at least one acid-cleavable C-O-C bond; B) a binder which is insoluble in water and soluble in aqueous-alkaline solutions; and C) a spiro-indolino-benzopyran of the general formula I in which R denotes hydrogen or an alkyl radical having 1 to 6 carbon atoms, R1, R2, R3, R4 are identical to or different from one another and denote hydrogen or halogen, alkyl groups or alkoxy groups having 1 to 4 carbon atoms or hydroxy groups or nitro groups; and R5, R6, R7, and R8 are identical to or different from one another and denote hydrogen or halogen, nitro groups or amino groups, alkyl groups, alkoxy groups or hydroxyalkyl groups having 1 to 5 carbon atoms or aryl groups having 6 to 10 carbon atoms. Upon exposure, the mixture results in a very pronounced color contrast which is maintained even at elevated temperatures.