Process for the preparation of mixtures of oligomeric phosphoric

Details Process for the preparation of mixtures of oligomeric phosphoric Process for the preparation of mixtures of oligomeric phosphoric

1996-10-23

1998-03-17

Cooney, Jr., John M.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

25218214, 25218224, 2521823, 521155, 521168, 524710, 528 72, 558 70, 558113, 558114, C08G 1804, C07F 902

Patent

active

057287465

ABSTRACT:
The invention relates to a process for the preparation of mixtures of oligomeric phosphoric acid esters of the formula (I) ##STR1## in which n is a number from 0 to 8,
R.sub.1, R.sub.2, R.sub.3 and R.sub.7 are identical or different and are a halogen-free alkyl or aryl radical or a hydroxyl-containing radical of the formula II and R.sub.4 is a radical of the formula III ##STR2## in which, in the formulae II and III, R.sub.5 and R.sub.6 are a hydrogen atom or an alkyl radical and m is a number from 1 to 4, which comprises reacting, in a first stage, aliphatic or araliphatic alcohols and/or phenols with phosphorus pentoxide (P.sub.4 O.sub.10) in a molar ratio of (2.8 to 6.0):1.0 (alcohol/phenol: P.sub.4 O.sub.10) at a temperature from 20.degree. to 100.degree. C. in the course of 0.5 to 72 hours, a polyphosphoric acid partial ester mixture of the formula V ##STR3## which R.sub.1 ', R.sub.2 ', R.sub.3 ' and R.sub.7 ' are an alkyl or aryl radical or H, being obtained, and, in a second stage, reacting this mixture with an epoxide of the formula (IV) ##STR4## at a temperature of 20.degree.-180.degree. C. The invention also relates to the use of the mixtures prepared by this process as flameproofing agents for polyurethanes.

REFERENCES:
patent: 3764640 (1973-10-01), Klose

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