Process for preparing of aromatic oligomers

Details Process for preparing of aromatic oligomers Process for preparing of aromatic oligomers

2006-05-23

2006-05-23

Mullis, Jeffrey (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From aldehyde or derivative thereof as reactant

C528S242000, C528S247000

Reexamination Certificate

active

07049389

ABSTRACT:
This invention relates to a process for preparing high-purity aromatic oligomers by effectively separating an organic layer containing aromatic oligomers or the reaction products of a polycyclic aromatic compound with formaldehyde from an aqueous layer containing an acid catalyst in a simplified manner, hitherto regarded difficult to accomplish, and obtaining high-purity aromatic oligomers from the organic layer containing a reduced amount of impurities. In separating the aqueous layer containing the acid catalyst and the organic layer containing the oligomers from the reaction mixture formed by the condensation of a polycyclic aromatic compound and formaldehyde, the emulsion phase is broken by adding a nonionic or cationic surfactant in an effective amount and an alkali in an amount sufficient to neutralize 1–70% of the acid in the acid catalyst, the organic and aqueous layers are separated and the aromatic oligomers are recovered from the organic layer.

REFERENCES:
patent: 6613947 (2003-09-01), Naik et al.
patent: 61-027930 (1986-02-01), None
patent: 02-134332 (1990-05-01), None
patent: 05-320295 (1993-12-01), None
J. Gordon Robinson et al., “The Reaction of Naphthalene with Formaldehyde in the Presence of Sulphuric Acid”, The British Polymer Journal, Jun. 1980, vol. 12, No. 2, pp. 61 to 69.
International Search Report for PCT/JP02/13632 mailed on Apr. 15, 2003.
English Translation of International Preliminary Examination Report for PCT/JP2002/013632 mailed on Jul. 22, 2004.

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