Polyester polyols with long-chain polyether polyol building blocks and use thereof in rigid pur/pir foams

Patent metadata

Field	Value
Publication number	US-9701805-B2
Application number	US-201414782857-A
Country	US
Kind code	B2
Filing date	Apr 8, 2014
Priority date	Apr 11, 2013
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

The invention relates to a polyester polyol which contains building units which are derived from ethylene glycol and/or diethylene glycol and which is characterized in that the polyester polyol furthermore comprises building units which are derived from at least one long-chain polyester polyol with a number-average molar mass of 1500 to 8000 Da. The invention further relates to a process for the production thereof and use thereof, in particular for the production of rigid PUR/PIR foams.

First claim

The invention claimed is:

1. A polyester polyol comprising structural units derived from ethylene glycol and/or diethylene glycol and structural units derived from at least one long-chain polyether polyol having a number average molar mass of 1500 to 8000 Da,
wherein the polyester polyol has a hydroxyl number of 165 to 260 mg, KOH/g, and
wherein:
(a) a proportion of polyester polyol, structural units derived from the long-chain polyether polyol is from 2 to 30 wt %, based on the mass of the polyester polyol;
(b) a proportion of polyester polyol structural units derived from ethylene glycol and/or diethylene glycol is from 35 to 58 wt %, based on the mass of the polyester polyol; and
(c) a proportion of polyester polyol structural units derived from an at least difunctional organic acid is from 40 to 75 wt %, based on the mass of the polyester polyol.

2. The polyester polyol of claim 1 , wherein the polyester polyol has an OH functionality of 1.8 to 3.

3. The polyester polyol of claim 1 , wherein the polyester polyol has from 50 to 100 mol % of primary hydroxyl end groups.

4. The polyester polyol of claim 1 , wherein the long-chain polyether polyol has a number average molar mass of 1500 to 7000 Da.

5. The polyester polyol of claim 1 , wherein the at least difunctional organic acid comprises glutaric acid, succinic acid, adipic acid, terephthalic acid, phthalic acid, isophthalic acid or a combination thereof.

6. The polyester polyol of claim 5 , wherein an aromatic fraction of the polyester polyol is from 0 to 50 wt %, and where a mixture of glutaric acid, succinic acid, adipic acid and/or phthalic acid is used.

7. The polyester polyol of claim 1 , wherein
(a) the proportion of polyester polyol structural units derived from the long-chain polyether polyol is from 3 to 20 wt %, based on the mass of the polyester polyol;
(b) the proportion of polyester polyol structural units derived from ethylene glycol and/or diethylene glycol is from 40 to 58 wt %, based on the mass of the polyester polyol; and
(c) the proportion of polyester polyol structural units derived from the at least difunctional organic acid is from 50 to 70 wt %, based on the mass of the polyester polyol.

8. The polyester polyol of claim 1 , wherein the long-chain polyether polyol has a number average molar mass of 3500 to 8000 Da.

9. The polyester polyol of claim 1 , wherein the long-chain polyether polyol has a number average molar mass of 4000 to 8000 Da.

10. The polyester polyol of claim 1 , wherein the long-chain polyether polyol has a number average molar mass of 3500 to 6000 Da.

11. The polyester polyol of claim 1 , herein the long-chain polyether polyol has a number average molar mass of 4000 to 6000 Da.

12. A method of preparing the polyester polyol of claim 1 , comprising reacting the at least difunctional organic acid with the ethylene glycol and/or diethylene glycol and the at least one long-chain polyether polyol having a number average molar mass of 1500 to 8000 Da, optionally in the presence of at least one catalyst.

13. A method of using the polyester polyol of claim 1 comprising including the polyester polyol in a 1-phase polyol component of a two-component reaction system for producing rigid PUR/PIR foams, wherein the 1-phase polyol component is free from flame retardants.

14. A reaction system for producing rigid PUR/PIR foams, comprising:
A) an organic polyisocyanate component,
B) a polyol component,
C) optionally auxiliary and added-substance materials and also blowing and co-blowing agent,
wherein said organic polyisocyanate component A) and said polyol component B) are used in such a mixing ratio relative to each other as to produce an index of 100 to 500 wherein
said polyol component B) comprises the polyester polyol of claim 1 .

15. The reaction system of claim 14 , wherein the weight ratio between components B) and A) is from 100:150 to 100:300.

16. A method of manufacturing a rigid PUR/PIR foam, which comprises mixing and reacting said components A) and B) and also optionally C) of the reaction system of claim 14 .

17. A rigid foam obtained by mixing and reacting said components A) and B) and also optionally C) of the reaction system of claim 14 .

18. The rigid foam of claim 17 , wherein the rigid foam is in the form of an insulating panel or of a composite element having flexible or non-flexible outer layers and has a density of 25 to 65 kg/m 3 , or is in the form of a slabstock foam and has a density of 25 to 300 kg/m 3 .

Assignees

• Bayer Materialscience Ag
• Covestro Deutschland Ag

Inventors

• Nefzger Hartmut
• Kuenzel Uwe
• Brassat Lutz

Classifications

• C08G18/7664 Primary

  containing alkylene polyphenyl groups · CPC title

• C08G63/672

  Dicarboxylic acids and dihydroxy compounds · CPC title

• C08G2150/00

  Compositions for coatings · CPC title

• C08G2101/0025

  Chemistry & Metallurgy · mapped topic

• C08J9/141 Primary

  Hydrocarbons · CPC title