B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
B29D 11/00 (2006.01) B29C 71/02 (2006.01) G02B 1/04 (2006.01)
Patent
CA 2055772
HOE 9O/F 345 ABSTRACT OF THE DISCLOSURE: Heat-resistant optical moldings, and a process for their production A process for the production of optical moldings from polysilazanes or polyhydridochlorosilazanes in which the polysilazanes or polyhydridochlorosilazanes are pressed to give moldings or dissolved in a solvent and extruded and are subsequently exposed to a gas atmosphere at a temperature in the range from 10 to 200°C and a relative humidity in the range from 20 to 100% for from 0.1 to 24 hours. The moldings have a core/cladding structure, the cladding comprising from 1 to 3% by weight of O, from 20 to 25% by weight of N and from 30 to 40% by weight of Si, and the core comprising 100% by weight of a polysilazane or poly- hydridochlorosilazane.
Brockmeyer Andreas
Bruck Martin
Stehlin Thomas
Theis Jurgen
Vaahs Tilo
Brockmeyer Andreas
Bruck Martin
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
Stehlin Thomas
LandOfFree
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