Th. Goldschmidt Ag

Jurgen Jachmann

Christian Weitemeyer

Dietmar Wewers

Gerhard Luhmann

Theodor Selbach

Dieter Wewers

Curable organopolysiloxanes with epoxy groups are disclosed which contain additionally at least one group of the formula

Use of epoxypolysiloxanes modified with oxyalkylene ether groups as a

Organopolysiloxanes are disclosed which contain, aside from methyl groups, alkyl groups with 1 to 20 carbon atoms, aryl groups or aralkyl groups, epoxy groups which are linked over Si--C bonds to silicon atoms of the polysiloxanes, and R.sup.3 OH groups, R.sup.3 being a divalent alkylene groups with 3 to 11 carbon atoms. The organopolysiloxanes have good compatibility with photoinitiators and adhesion and release properties which can be adjusted for the intended application by coordinating the long chain alkyl groups, the epoxy groups and the --R.sup.3 OH groups.

Curable organopolysiloxanes having epoxy groups, methods of synthesizing

A method and apparatus are disclosed for achieving and maintaining an inert atmosphere as oxygen-deficient as possible in a treatment chamber, having a reaction zone, particularly an irradiation chamber, traversed by a length of material, wherein the length of material is supplied to the chamber through an inlet channel and conducted from the chamber through an outlet channel. A circulating inert gas stream, which detaches the entrained gas boundary layer held by the material, is moved countercurrently to the length of material in the inlet channel and is supplemented in a controlled manner with fresh inert gas in such amount that a given maximum oxygen concentration is not exceeded in the reaction zone and the flow rate of the inert gas stream is controlled, so that the pressure before the exit gap of the outlet channel is the same or slightly higher than the surrounding pressure.

Apparatus for achieving and maintaining an oxygen-deficient inert

Method for achieving and maintaining an oxygen-deficient inert

A (meth)acrylate ester-modified organopolysiloxane composition, which is composed of several fractions of equilibrated (meth)acrylate ester-modified organopolysiloxanes that differ in the average number of silicon atoms in the mixture of molecules, is disclosed which contains

(Meth)acrylate ester-modified organopolysiloxanes

Novel polysiloxanes with (meth)acrylate groups and monocarboxylate groups and their use as radiation-curable abhesive coating matrials are disclosed. The modified polysiloxanes adhere well to the support that is to be coated and can be cured at a high rate on the support. The cured coating has good chemical and physical stabilities and a high flexibility. The abhesive properties can be adapted to the chemical character of the adhesives, so that the desired degree of abhesiveness is obtained.

Polysiloxanes with (meth)acrylate ester groups linked over SiC groups

Polysiloxanes with (meth)acrylate ester groups linked over SiC groups are disclosed which are obtainable by the reaction of epoxy-functional polysiloxanes of the general formula ##STR1## in which R.sup.1 are the same or different low molecular alkyl groups with 1 to 4 carbon atoms or phenyl groups,

Polysiloxanes with (meth) acrylate ester groups linked through sic

Acrylate or methacrylate ester modified organopolysiloxane mixtures comprising essentially equilibrated organpolysiloxanes with, on the average, more than 25 to fewer than 200 silicon atoms and additionally containing 2 to 30 weight percent of organopolysiloxanes with, on the average, 2 to 25 silicon atoms, and 2 to 30 weight percent of organopolysiloxanes with, on the average, 200 to 2,000 silicon atoms, as well as processes for the preparation of mixtures of modified organopolysiloxanes of this composition. The inventive acrylate or methacrylate ester modified organopolysiloxane mixtures have excellent adhesion to metallic substrates and their surfaces exhibit good abhesive properties towards adhesives.

Growing community of inventors

Herne, Germany

Jurgen Jachmann