Process for the preparation of cellular and non-cellular polyure

Details Process for the preparation of cellular and non-cellular polyure Process for the preparation of cellular and non-cellular polyure

1984-04-09

1984-11-06

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521173, 528 76, 528 77, 528 79, C08G 1814

Patent

active

044813090

ABSTRACT:
The invention relates to a process for the preparation of cellular or non-cellular polyurethanes through the reaction of organic polyisocyanates with a polyether-polyester polyol component containing di- to tetrafunctional polyether-polyester polyols having hydroxyl numbers of from 10 to 200, which are themselves prepared by esterifying conventional di- to tetrafunctional polyether polyols with carboxylic acid anhydrides, preferably aromatic carboxylic acid anhydrides, in the presence of selected catalysts to form carboxylic acid half esters, and oxyalkylating the resulting carboxylic acid half esters with alkylene oxides in the presence of N-methylimidazole, triethylene diamine, triphenylphosphine or mixtures thereof with thiodialkylene glycol as catalysts.

REFERENCES:
patent: 3455886 (1969-07-01), Versnel
patent: 3585185 (1971-06-01), Levis et al.
patent: 3639541 (1972-02-01), Austin et al.
patent: 3639542 (1972-02-01), Pizzini et al.

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