Polyol compositions having good flow and water blown rigid polyu

Details Polyol compositions having good flow and water blown rigid polyu Polyol compositions having good flow and water blown rigid polyu

1995-04-21

1998-08-25

Sergent, Rabon

Compositions

Compositions containing a single chemical reactant or plural...

Organic reactant

25218227, 25218228, 521114, 521117, 521121, 521126, 521127, 521129, 521130, 521137, 521170, 521172, 521173, 521174, 521176, C08J 908, C08G 1818, C08G 1822, C08G 1848

Patent

active

057985332

ABSTRACT:
A polyol composition is provided which when reacted with and organic isocyanate, has good flow characteristics and makes an all water blown rigid polyurethane foam having good dimensional stability at low core densities of 1.1 pcf to 2.0 pcf. The polyol composition has a polyol component which must have present a polyoxyalkylene polyether polyol having an equivalent weight of 130 or less, an average functionality of 3.1 or greater, and a hydroxyl number of 400 or more, a polyoxyalkylene polyether polyol having an average functionality from 1.5 to 3.1 and a viscosity of less than 800 cP at 25.degree. C., and a polyoxyalkylene polyether polyol having an average functionality of greater than 3.1 and an equivalent weight of greater than 130. The polyol composition also has water as the blowing agent, and further contains a blow catalyst, a delayed action gel catalyst, and preferably a cure catalyst and a surfactant.

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