method for networking of polyvinyl alcohol gelatin or a gelatinederivat

摘要

1502618 Hardening photographic gelatine CIBA-GEIGY AG 21 Nov 1975 [3 Dec 1974] 52241/74 Heading G2C [Also in Division C3] A process for cross-linking hydrophilic colloids which contain amino and/or hydroxyl groups comprises incorporating into the hydrophilic colloid as a cross-linking agent a compound of the general Formula: in which G is a halogen atom and M is a cation but excluding a hydrogen ion. The colloid can be polyvinyl alcohol, gelatine or a gelatine derivative used as a layer in a photographic material. M may be for example a lithium, sodium, potassium, rubiduim, Caesium, magnesium, calcium, ammonium or substituted ammonium ion.