Abstract:
A liquid developer and a charge control substance for developing positively charged electrostatic charge images. The developer comprises an electrically insulating carrier liquid having a high resistance and a low dielectric constant and which contains a pigment or dye, a resinous binder, the charge control substance and conventional additives in dispersion or solution. The charge control substance is a negative-controlling graft copolymer soluble in an aliphatic hydrocarbon and is obtained by grafting a carboxylic acid N-alkenylamide onto polymers soluble in aliphatic hydrocarbons used as the carrier liquid. The carboxylic acid N-alkenylamide is a compound of the formula: ##STR1## in which R is hydrogen or C.sub.1 -C.sub.3 alkyl,R.sub.1 is hydrogen or C.sub.1 -C.sub.20 alkyl, andR.sub.2 is C.sub.2 -C.sub.4 alkenyl.
Abstract:
A photopolymerizable composition that contains a polymeric binder, a polymerizable compound and photoinitiator combination comprising an N-heterocyclic compound and a halogen compound corresponding to one of the folowing formulas I and II ##STR1## in which X.sup.1 stands for chlorine or bromine,X.sup.2 and X.sup.3 are identical or different and denote X.sup.1, hydrogen or alkyl groups,Y and Z are identical or different and denote X.sup.1, hydrogen, CN or (A).sub.n --(B).sub.n --D,A is a phenylene group,n is 0 or 1,B is CO or SO.sub.2,D is R, OR, NHR, NH.sub.2, NR.sub.2 or CX.sup.1 X.sup.2 X.sup.3,R is an alkyl, cycloalkyl, aryl or heteroyl radical,W is a five or six-membered heterocyclic ring having from 1 to 3 heteroatoms, which optionally carries substituents and optionally a fused aromatic ring, andm is 1 or 2,is distinguished by an improved light sensitivity.