Preparing rigid polyurethane foams
AssigneeBASF SE
InventorGunnar Kampf
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for preparing rigid polyurethane foams or rigid polyisocyanurate foams by using certain polyetherester polyols B) based on aromatic dicarboxylic acids, optionally further polyester polyols C), which differ from those of component B), and polyether polyols D), wherein the mass ratio of total components B) and optionally C) to component D) is less than 1.6. The present invention also relates to the rigid foams thus obtainable and to their use for producing sandwich elements having rigid or flexible outer layers. The present invention further relates to the underlying polyol components.
Claims18
A process for preparing a rigid polyurethane foam or rigid polyisocyanurate foam comprising:
- preparing a mixture comprising:
- A) a polyisocyanate,
- B) a polyetherester polyol obtained by esterification of
- b1) 10 to 70 mol % of a dicarboxylic acid composition comprising
- b11) 50 to 100 mol %, based on the dicarboxylic acid composition, of an aromatic dicarboxylic acid or derivative thereof,
- b12) 0 to 50 mol %, based on the dicarboxylic acid composition b1), of an aliphatic dicarboxylic acid or derivative thereof,
- b2) 2 to 30 mol % of a fatty acid or fatty acid derivative,
- b3) 20 to 45 mol % of an aliphatic or cycloaliphatic diol having 2 to 18 carbon atoms or an alkoxylate thereof,
- b4) 15 to 35 mol % of a polyether polyol having a functionality of not less than 2 and a OH number of from 150 to 950 mg KOH/g, prepared by alkoxylation of
- a polyol having a functionality of above 2,
- all based on the total amount of components b1) to b4), wherein said components b1) to b4) sum to 100 mol %,
- C) optionally, a polyester polyol different from the polyetherester B),
- D) a polyether polyol,
- E) optionally flame retardants,
- F) a blowing agent,
- G) a catalyst, and
- H) optionally an auxiliary or additive,
- wherein
- a mass ratio of total components B) and optionally C) to component D) is less than 1.6;
- and
- reacting the mixture prepared to obtain the rigid polyurethane foam or rigid polyisocyanurate foam.
A polyol component, comprising:
- 10 to 50 wt % of polyetherester polyol B),
- 0 to 30 wt % of a polyester polyol C),
- 25 to 55 wt % of a polyether polyol D),
- 10 to 40 wt % of a flame retardant E),
- 1 to 30 wt % of a blowing agent F),
- 0.5 to 10 wt % of a catalyst G), and
- 0 to 20 wt % of an auxiliary and/or additive H),
- each based on the total weight of components B) to H), wherein the wt % add up to 100 wt %,
- wherein the polyetherester polyol B) is obtained by esterification of
- b1) 10 to 70 mol % of a dicarboxylic acid composition comprising
- b11) 50 to 100 mol %, based on the dicarboxylic acid composition, of an aromatic dicarboxylic acid or derivative thereof,
- b12) 0 to 50 mol %, based on the dicarboxylic acid composition b1), of an aliphatic dicarboxylic acid or derivative thereof,
- b2) 2 to 30 mol % of a fatty acid or fatty acid derivative,
- b3) 20 to 45 mol % of an aliphatic or cycloaliphatic diol having 2 to 18 carbon atoms or an alkoxylate thereof,
- b4) 15 to 35 mol % of a polyether polyol having a functionality of not less than 2 and a OH number of from 150 to 1250 mg KOH/g, prepared by alkoxylation of a polyol having a functionality of above 2,
- all based on the total amount of components b1) to b4), wherein said components b1) to b4) sum to 100 mol %,
- and wherein a mass ratio of components B) and C) to component D) is less than 1.6.
Dependencies are inferred from the claim text.