Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in reactor of specified material – or in reactor...
Patent
1980-08-11
1983-05-10
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in reactor of specified material, or in reactor...
528176, 528180, 528181, 528196, 528200, 528198, C08G 6362, C08G 6302, C08J 926, C08J 928
Patent
active
043830927
ABSTRACT:
A process for the production of a substantially clear and colorless, or at most slightly tinted, polyarylcarbonates useful to form molded structural and engineering articles suitable to replace metal parts, or for use in electrical appliances to form lenses, safety shields, instrument windows and the like is disclosed.
The tendency of color formation in polycarbonates and polyarylates prepared by transesterification and polycondensation is reduced or inhibited by carrying out the transesterification reaction while the reaction mixture contacts only metal surfaces of selective metals, or glass. The metal surfaces are provided by such metals as tantalum, nickel, or chromium or mixtures thereof. The reaction is carried out in reactors or systems which are substantially totally made of such metals, or reactors or systems clad or lined with a layer of such metals or glass. In its broad aspects the invention comprises carrying out the reaction in the substantial absence of metals selected from the group consisting of iron, tin, lead, titanium, vanadium, zirconium, stainless steel, and Group IIIA metals, namely, aluminum, gallium, indium and thallium. The preferred method of carrying out the reaction is in the absence of metals other than nickel, tantalum and chromium or mixtures thereof.
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Ko Allen W.
Starr, Jr. John B.
Anderson Harold D.
General Electric Company
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