Sucrose based polyether polyols
AssigneeMobay Chemical Corporation
InventorNeil H. Nodelman
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Abstract
The invention provides a means for making a high functional (.gtoreq.6.5), low viscosity, low hydroxyl number sucrose-based polyether polyol. The process involves the use of a polyalkylene polyamine, such as diethylenetriamine, as both co-initiator and catalyst for the alkoxylation reaction of sucrose. These polyols are particularly suited for the production of rigid polyurethane foams having excellent dimensional stability, particularly at low temperatures.
Claims11
In a process for the preparation of sucrose-based polyether polyols having a functionality of at least 6.5 and an OH number of 400 or less by the alkoxylation of sucrose with an alkylene oxide, the improvement which comprises reacting the alkylene oxide with a sucrose mixture containing:
- (A) 100 parts by weight of sucrose;
- (B) up to 1.3 parts by weight of water;
- (C) 4-50 parts by weight of a polyalkylene polyamine containing at least three nitrogen atoms and at least four active hydrogen atoms attached to the nitrogen atoms;
- (D) from about 50-110 parts by weight of an aromatic hydrocarbon solvent.
Dependencies are inferred from the claim text.