US 2003/0125407 A1Published application

Co-initiated polyether polyol and process for its preparation

OwnerThomas Bronnum, Melis Hasselaar +2inventors

InventorsThomas Bronnum, Melis Hasselaar, Parminder Singh Sangha, Francoise Van Tiggelen

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Abstract

Process for the preparation of a co-initiated polyether polyol, which process comprises the steps of (a) preparing a mixture of at least one aromatic initiator, at least one polyethylene glycol and optionally one or more aliphatic initiators, (b) reacting the mixture obtained in step (a) in the presence of a suitable alkoxylation catalyst with at least one alkylene oxide having three or more carbon atoms per molecule using such quantity of alkylene oxide that the polyether polyol obtained has a hydroxyl value in the range of from 150 to 400 mg KOH/g, and (c) recovering the co-initiated polyether polyol. The co-initiated polyether polyol is very suitable for (the preparation of rigid polyisocyanurate-modified polyurethane foams. Such foams have a good flame retardancy.

Claims10

Dependent claims

Process for the preparation of a co-initiated polyether polyol, which process comprises the steps of:

(a) preparing a mixture of:
(a1) at least one aromatic initiator containing at least two active hydrogen atoms per molecule and
(a2) at least one polyethylene glycol having a molecular weight in the range of from 400 to 1000 and
(a3) optionally one or more aliphatic initiators containing from 2 to 6 active hydrogen atoms per molecule in an amount of at most 20 mole % based on total moles of (a1) and (a3), wherein the molar ratio of (a1) to (a2) is in the range of from 0.5:1 to 5:1,
(b) reacting the mixture obtained in step (a) in the presence of a suitable alkoxylation catalyst with at least one alkylene oxide having three or more carbon atoms per molecule using such quantity of alkylene oxide that the polyether polyol obtained has a hydroxyl value in the range of from 150 to 400 mg KOH/g, and
(c) recovering the co-initiated polyether polyol.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/353,484Filed 29 Jan 2003
Priority: EP 98203026.410 Sep 1998
Published: 3 Jul 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

C08G 65/2609
Containing hydroxyl groups: containing aliphatic hydroxyl groups
C08G 18/482
Two or more polyethers of different physical or chemical nature: mixtures of polyethers containing at least one polyether containing nitrogen
C08G 65/26
From cyclic ethers by opening of the heterocyclic ring: from cyclic ethers and other compounds
C08G 65/2612
Containing hydroxyl groups: containing aromatic or arylaliphatic hydroxyl groups

Family

Application09/786,775Division · filed 8 Mar 2001
Application09/786,775A 371 of international · filed 8 Mar 2001
Application10/353,484Division · filed 29 Jan 2003
US 6,538,043 B1Related patent
US 2003/0125407 A1This patent

From the US filing history. Foreign family members aren’t listed.