Ammonia-modified polyether polyols and polyurethane polymers prepared therefrom
OwnerTito Viswanathaninventor
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Abstract
The present invention relate to a method of preparing a novel polyurethane polymer having good flame-retardent qualities from an ammonia-modified polyether polyol. The preferred method comprises treating a reducing sugar with an epoxide to form a polyether polyol which is then treated with ammonia, which reacts with the polyol chemically and becomes chemically bound thereto. The ammonia-modified polyether polyol is then reacted with an isocyanate to form a fire-resistant polyurethane.
Claims10
A method for making an ammonia-modified polyether polyol for use in the manufacture of polyurethane polymer having improved fire-resisting qualities, said method comprising:
- (a) reacting a reducing sugar with an epoxide to produce a crude polyether polyol;
- and
- (b) then reacting the polyether polyol with an effective amount of gaseous or liquid ammonia to chemically bind the ammonia to the polyol to produce an ammonia-modified polyether polyol.
A method of making a polyurethane polymer having improved fire-resisting qualities comprising the steps of:
- (a) reacting a reducing sugar with propylene oxide to produce a polyether polyol;
- (b) reacting the resulting polyether polyol with ammonia gas to produce a modified polyether polyol;
- and
- (c) treating the modified polyether polyol with a reactive polyisocyanate to produce the desired polyurethane polymer.
The method of making polyether polyols comprising the following steps:
- (a) reacting of lactose with propylene oxide at a temperature between 80.degree. to 120.degree. C.;
- (b) adding up to 15% by weight of the mixture of urea to the crude polyol preparation;
- (c) adding ammonia to the mixture to form ammonia-modified polyether polyols.
Dependencies are inferred from the claim text.