Polyurethane foam having tuneable porosity in wide range
AssigneeShell USA, Inc.
InventorsArvind KUMAR, Pranaya Man Singh PRADHAN, Prashant Anil TATAKE
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Abstract
The invention relates to a process for preparing a polyurethane foam, comprising reacting a polyisocyanate with a polyether polyol component a) in the presence of a blowing agent, wherein polyether polyol component a) comprises: a1) a first polyether polyol having a molecular weight of from 300 to 1,500 g/mol, a hydroxyl value of from 100 to 650 mg KOH/g and a propylene oxide content above 50 wt. %; and a2) a second polyether polyol having a molecular weight of from 500 to 1,700 g/mol, a hydroxyl value of from 50 to 650 mg KOH/g, an ethylene oxide content above 30 wt. %, a propylene oxide content below 50 wt. % and a primary hydroxyl content below 40%.
Claims10
A process for preparing a polyurethane foam, comprising reacting a polyisocyanate with a polyether polyol component a) in the presence of a blowing agent, wherein polyether polyol component a) comprises:
- a1) a first polyether polyol having a molecular weight of from 300 to 1,500 g/mol, a hydroxyl value of from 100 to 650 mg KOH/g and a propylene oxide content above 50 wt. %;
- and
- a2) a second polyether polyol having a molecular weight of from 500 to 1,700 g/mol, a hydroxyl value of from 50 to 650 mg KOH/g, an ethylene oxide content above 30 wt. %, a propylene oxide content below 50 wt. % and a primary hydroxyl content below 40%.
Dependencies are inferred from the claim text.