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US 5,856,012 AGranted
Process for the production of multilayer plastic sheets
AssigneeBayer Aktiengesellschaft
InventorsSteffen Kuhling, Hartmut Lower, Siegfried Anders, Jurgen Kirsch, Werner Verhoeven
Life of this patent
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Abstract
The invention relates to a process for the production of multilayer plastic sheets from special branched polycarbonates.
Claims6
A multilayer sheet obtained by coextrusion from silicon-free branched polycarbonate, comprising a core layer and at least one coextruded outer layer containing UV absorbers, the improvement which comprises coextruding said layers from silicon-free, branched polycarbonate of 2,2-bis-(4-hydroxyphenyl)-propane having a weight average molecular weight of from 27,000 to 29,500.
Dependencies are inferred from the claim text.