Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1991-01-03
1992-09-08
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, 528366, 4283179, C08G 1814
Patent
active
051458837
ABSTRACT:
The present invention relates a method for producing a polyether ester polyol containing polycarboxylic acid residues in the vicinity of the terminals, by means of a doubles metal cyanide complex catalyst. Namely, the present invention is a method for producing a polyether ester polyol by reacting a polyether polyol having a hydroxyl value of at most 400, a polycarboxylic anhydride and a monoepoxide by means of a double metal cyanide complex as a catalyst.
The present invention relates also to a process for producing a flexible polyurethane foam or a polyurethane elastomer using this polyether ester polyol. The flexible polyurethane foam produced has a high thermal fusing properties, and by laminating it with e.g. cloth, it is possible to obtain a laminate having high bond strength. Further, this polyurethane elastomer has superior physical properties as compared with an elastomer obtainable by using a polyether polyol or a polyester polyol.
REFERENCES:
patent: 3538043 (1970-11-01), Herold
patent: 4902816 (1990-02-01), McDaniel
Kozawa Sigeyuki
Kunii Nobuaki
Saito Joichi
Takeyasu Hiromitsu
Yamamoto Hirotsugu
Asahi Glass Company Ltd.
Welsh Maurice J.
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