公开(公告)号：CA1062094A

公开(公告)日：1979-09-11

申请号：CA246044

申请日：1976-02-18

Applicant: HOECHST AG

Inventor： ARNETH REINHOLD ,  SCHWANDT RUDI

IPC: G03G15/10 ,  G03G13/10

Abstract: A process and apparatus for developing a latent electrostatic image on an electrophotographic copying material by means of a toner dispersion. An infeed roller applies the toner dispersion to the copying material, and, downstream thereof, a distribution roller acts on the surface of the copying material. To solve the problem of reproducing fine white indicia, such as thin white lines, on a black background, a voltage, having the same polarity as the surface charge of the latent electrostatic image on the copying material, is applied to the distribution roller. Squeegee rollers downstream of the distribution roller effect removal of unused toner. Toner, which adheres to the distribution roller during application of voltage to the distribution roller, is sprayed off and recovered for recycling, the spraying agent being toner dispersion.

公开(公告)号：CA2021978A1

公开(公告)日：1991-01-28

申请号：CA2021978

申请日：1990-07-25

Applicant: HOECHST AG

Inventor： ARNETH REINHOLD ,  HEHL EBERHARD ,  FRASS WERNER ,  JUNG GUENTER

IPC: G03F7/00 ,  G03F7/004 ,  G03F7/021 ,  G03F7/032

Abstract: The invention describes a solvent mixture for photohardenable compositions, which includes (a) a first component having (i) a first constituent of (aa) a polar solvent of the formula R-OH, wherein R is a H or alkyl, or (aa') a monoalkylether or an alkylether ester of a glycol and (ii) a second constituent of an organic solvent having a boiling point in the range of from about 60 to 160.degree.C and comprising an aliphatic ketone, an alkanoic acid alkylester, a hydroxyalkanoic acid alkylester or a cyclic ether, in quantitative proportions selected to form a homogeneous mixture, and b) from about 0.1 to 8% by weight, relative to the total solvent mixture, of another solvent, the boiling point of which is higher than each individual boiling point of the constituents of the first component (a). The solvent mixture is used to obtain coating solutions layers which have a higher photosensitivity than corresponding layers prepared without the addition of component (b).

公开(公告)号：BR9003633A

公开(公告)日：1991-08-27

申请号：BR9003633

申请日：1990-07-26

Applicant: HOECHST AG

Inventor： ARNETH REINHOLD ,  HEHL EBERHARD ,  FRASS WERNER ,  JUNG GUENTER

IPC: G03F7/00 ,  G03F7/004 ,  G03F7/021 ,  G03C1/61 ,  G03F7/16

Abstract: A description is given of a solvent mixture for photocurable mixtures which consist of a) a mixture of aa) a polar solvent of the formula R - OH, where R is H or alkyl, or aa') a monoalkyl ether or an alkyl ether ester of a glycol, and ab) an organic solvent having a boiling point in the 60 - 160 DEG C range which is an aliphatic ketone, an alkanoic acid or an alkyl ester of hydroxyalkanoic acid or a cyclic ether, in a quantity ratio such that a homogeneous mixture is formed, and b) 0.1 to 8% by weight (based on the total solvent mixture) of a solvent whose boiling point is higher than any individual boiling point of the solvents mentioned under (a). The coating solutions produce layers whose light sensitivity is higher than that of similar layers obtained without adding (b).