Back to results
US 8,557,887 B2Granted
Process for producing rigid polyurethane foams
AssigneeBASF SE
InventorsMichael Koesters, Gunnar Kampf, Roland Fabisiak, Olaf Jacobmeier
Life of this patent
Estimating the term…
Abstract
The invention relates to a process for producing rigid polyurethane foams by reacting a) polyisocyanates with b) compounds having at least two hydrogen atoms which are reactive toward isocyanate groups in the presence of c) blowing agents, wherein the compounds b) having at least two hydrogen atoms which are reactive toward isocyanate groups comprise at least one aromatic polyester alcohol bi), at least one polyether alcohol bii) having a functionality of from 4 to 8 and a hydroxyl number in the range from 300 to 600 mg KOH/g.
Claims19
A process for producing rigid polyurethane foams, comprising:
- reacting polyisocyanates (a) with compounds (b) having at least two hydrogen atoms which are reactive toward isocyanate groups in the presence of blowing agents (c), and a flame retardant (d),
- wherein
- the compounds (b) having at least two hydrogen atoms which are reactive toward isocyanate groups comprise:
- at least one aromatic polyester alcohol (bi), which is prepared using a fatty acid,
- at least one polyether alcohol (bii) having a functionality of from 4 to 8, and a hydroxyl number in the range from 300 to 600 mg KOH/g, and
- at least one polyether alcohol (biii) having a functionality of from 2 to 4 and a hydroxyl number in the range from 100 to less than 300 mg KOH/g,
- wherein a weight ratio of the at least one aromatic polyester alcohol (bi) to a sum of the at least one polyether alcohol (bii) and the at least one polyether alcohol (biii) is from greater than 0.15 to less than 4, and the average content of the fatty acid of the compounds (b) is greater than 1% by weight and less than 30% by weight based on a total weight of the compounds (b) and the flame retardant (d).
4 more elements
Dependencies are inferred from the claim text.