Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1997-05-05
1998-10-13
Mosley, Terressa
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
502150, 502164, C08G 6400
Patent
active
058213228
ABSTRACT:
Diaminoalkyl quaternary ammonium salts are prepared by the reaction of alkyl halides with tertiary diamines having C.sub.2-20 primary alkyl radicals attached to nitrogen and an alkyl radical between the two nitrogen atoms in which at least three carbon atoms separate said nitrogen atoms. Said salts are preferably substantially free from corresponding diamines. They are useful as catalysts for interfacial polycarbonate preparation by the reaction of phosgene with at least one dihydroxyaromatic compound. Polycarbonate preparation using such catalysts is economical in phosgene consumption, is accompanied by a rapid conversion of chloroformate groups to desirable species and affords a product with a very low proportion of unreacted dihydroxyaromatic compound.
REFERENCES:
patent: 5391692 (1995-02-01), Boden et al.
patent: 5510449 (1996-04-01), Flowers et al.
patent: 5519105 (1996-05-01), Boden et al.
Boden Eugene Pauling
Brunelle Daniel Joseph
Capelle Erik Hendrick Adriaan
Flowers Larry Ivis
Nelson Mark Erik
General Electric Company
Johnson Noreen C.
Mosley Terressa
Stoner Douglas E.
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