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Title: Process for preparing polycarbonates

Abstract: Extruded films having reduced proneness to stress-cracking, good resistance to casting resins of unsaturated polyesters and no blocking effect and produced from branched aromatic polycarbonates which are the reaction products of aromatic dihydroxy compounds and branching agents having more than three phenolic hydroxyl groups, with polycarbonate precursors. The films are useful as insulating films in the electrical industry.


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Inventors: Binsack, Rudolf (Krefeld, DT)
Haupt, Heinrich (Krefeld, DT)
Vernaleken, Hugo (Krefeld, DT)
Reese, Eckart (Dormagen, DT)

Application Number: 409201
Filing Date: 1973-10-24
Publication_date: 1976-01-06
Assignee: Bayer Aktiengesellschaft (Leverkusen Bayerwerk, DT)
Primary Class(es): 528/199 525/462, 528/125, 528/128, 528/174, 528/196, 528/202, 528/204
Other Classes:
US Patent Ref:
3646102Feb, 1972Kobayashi et al.260/47.
R27682Jun, 1973Schnell et al.260/47.

Other Refs: 715,142
Aug, 1965CA

Primary Examiner: Briggs, Sr., Wilbert J.
Assistant Examiner:
Attorney: Pope; Lawrence S.