Polyether polyol for preparing rigid polyurethane foams

Details Polyether polyol for preparing rigid polyurethane foams Polyether polyol for preparing rigid polyurethane foams

1996-12-09

1998-10-20

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...

25218225, 521159, 521174, 521177, C08G 1814

Patent

active

058247149

ABSTRACT:
A polyether polyol is provided having an aromaticity in the range of from 5% to 35%, an average nominal functionality (Fn) in the range of from 2.0 to 4.5 and a hydroxyl value in the range of from 390 to 650 mg KOH/g, whereby the aromatic carbon atoms are contained in structural moieties of the general formula ##STR1## wherein both R1 groups independently represent hydrogen or a C1-C3 alkyl group; both R2 groups independently represent a C1-C3 alkyl group; and n is an integer of from 0 to 3. A further aspect of the disclosure is a process for the preparation of the above polyether polyol, which process comprises reacting an alkylene oxide with a polyhydric alcohol blend comprising a diphenylol alkane precursor of the above indicated structural moiety and at least one aliphatic or alicyclic polyhydric alcohol having a functionality of at least 2.0. A polyether polyol blend is also disclosed, the blend having an aromaticity in the range of from 2 to 10% and a Fn in the range of from 2.5 to 5.0 eq/mole, which blend comprises the above polyether polyol and one or more aliphatic or alicyclic polyether polyols having a Fn of at least 2.5.

REFERENCES:
patent: 2846408 (1958-08-01), Brochhagen et al.
patent: 3833526 (1974-09-01), Cear et al.
patent: 4581388 (1986-04-01), Rasshofer et al.
patent: 5124369 (1992-06-01), Vandichel et al.
patent: 5225101 (1993-07-01), Yamamori

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