Patent · US Expired

Graft copolymers and colorless, transparent electrophotographic toners comprising these

US5750306A · kind A · utility

5Cited by

5References

18Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Raimund J. Faust · Wiesbaden, DE
Danuta Eva Allen · Wiesbaden, DE
Silvia Lutz · Mainz, DE

Key dates

Filing date	Dec 27, 1995
Grant date	May 12, 1998
Priority date	—
Expiry date	Dec 27, 2015

Classification

Technology area (CPC G)Physics
CPC primaryG03G13/28
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A graft copolymer of recurring units of (C.sub.6 -C.sub.18)alkyl (meth)acrylate (A), N-vinylpyrrolidone (B), glycidyl (meth)acrylate (C), and glycidyl (meth)acrylate units esterified with (meth)acrylic acid (D) onto which polymeric side chains of units of N-vinylpyrrolidone, (C.sub.1 -C.sub.3)alkyl acrylate and, if appropriate, (C.sub.1 -C.sub.3)alkyl methacrylate are grafted. The polymer is suitable as a binder for colorless, negatively chargeable liquid toners, in particular in combination with graft copolymers of (C.sub.1 -C.sub.6)alkyl (meth)acrylate, (C.sub.6 -C.sub.18)alkyl (meth)acrylate and units in which chains of N-vinyl-pyrrolidone units are grafted onto one of the units mentioned, as a charge control agent. After fixing of the electrophotographically produced toner image, the toners give colorless resist masks or printing screens with a high resistance toward etching agents and solvents.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.