Bayer Aktiengesellschaft

Covestro Deutschland Ag

Manfred Botzen

Andreas Elschner

Detlev Joachimi

Frank Krause

Klaus Sommer

Herbert Magerstedt

Olaf Zöllner

Jurgen Thiemann

Detlef Riesebeck

Christoph Hermansen

Dark-colored thermoplastic molding compositions are disclosed. The compositions are suitable for making molded parts which in the wavelength region from 700 to 1200 nm are laser-transmitting, at least in spectral partial regions, and may be welded to laser-absorbing molded parts by means of laser transmissions welding.

Laser beam weldable thermoplastic molding materials

The apparatus is based on a standard grindometer block comprising a longitudinally extending sample channel of steadily increasing depth which is filled with the paint to be investigated and then stripped and smoothed with a doctor blade. Instead of being visually evaluated, the paint surface is subjected to automatic objective evaluation in an optoelectronic apparatus comprising a light source with a focussing lens for producing a light spot on the paint surface to be investigated, a dark-field lens comprising an objective for picking up the scattered light emanating from pigment particles in the vicinity of the light spot and an aperture diaphragm for eliminating the light directly reflected at the paint surface, a photoreceiver connected to an evaluation circuit for detecting, recording and further processing the scattered light signals and a scanner for longitudinally scanning the sample channel.

Apparatus for determining the size distribution of pigment particles in

Growing community of inventors

Krefeld, Germany

Manfred Botzen