Polyurethanes having reduced aldehyde emission

Patent metadata

Field	Value
Publication number	US-2016304686-A1
Application number	US-201415100777-A
Country	US
Kind code	A1
Filing date	Nov 27, 2014
Priority date	Dec 2, 2013
Publication date	Oct 20, 2016
Grant date	—

Abstract

The present invention relates to a process for the production of polyurethanes where (a) polyisocyanate, (b) polymeric compounds having groups reactive toward isocyanates, (c) catalysts, (d) a CH-acidic compound of the general formula R 1 —CH 2 —R 2 , where R 1 and R 2 independently of one another are an electron-withdrawing moiety of the general formula —C(O)—R 3 or —CN, where the moiety R 3 is selected from the group consisting of —NH 2 , —NH—R 4 —NR 5 R 6 , OR 7 or R 8 , where R 4 , R 5 , R 6 , R 7 , and R 8 are independently selected from the group consisting of aliphatic, araliphatic or aromatic hydrocarbons, which may have substitution, and optionally (e) blowing agent, (f) chain extender and/or crosslinking agent, and (g) auxiliaries and/or additives are mixed to give a reaction mixture, and the reaction mixture is allowed to complete a reaction to give the polyurethane. The present invention further relates to polyurethanes produced by this process and to the use of these polyurethanes in the interior of means of transport.

First claim

1 . A process for producing a polyurethane, the process comprising:
mixing (a) polyisocyanate, (b) polymeric compounds having groups reactive toward isocyanates, (c) catalysts, comprising incorporable amine catalysts, (d) a CH-acidic compound of the general formula
R 1 —CH 2 —R 2 ,

where R 1 and R 2 independently of one another are an electron-withdrawing moiety of the general formula —C(O)—R 3 or —CN, where the moiety R 3 is selected from the group consisting of —NH 2 , —NH—R 4 —NR 5 R 6 , OR 7 and R 8 , where R 4 , R 5 , R 6 , R 7 , and R 8 independently are selected from the group consisting of an aliphatic hydrocarbon, an araliphatic hydrocarbon, and an aromatic hydrocarbon, which optionally have substitution, and optionally
(e) a blowing agent, (f) a chain extender and/or a crosslinking agent, and (g) auxiliaries and/or additives to give a reaction mixture, and reacting the reaction mixture to give the polyurethane, wherein the compound R 1 —CH 2 —R 2 comprises one or more isocyanate-reactive groups, or a molecular weight of the CH-acidic compound (d) is greater than 250 g/mol.

2 . The process as claimed in claim 1 , wherein the moiety R 3 is —NH—R 4 —NR 5 R 6 , OR 7 , or R 8 , and the moieties R 4 , R 5 , R 6 , R 7 , and R 8 are each independently of one another an aliphatic hydrocarbon having from 1 to 15 carbon atoms, which optionally has substitution.

3 . The process as claimed in claim 1 , wherein the isocyanate-reactive groups comprise —OH, —NH— or —NH 2 groups.

4 . The process as claimed in claim 1 , wherein the quantity of component (d), based on the total weight of components (a) to (f), is from 0.01 to 5% by weight.

5 . The process as claimed in claim 1 , wherein the polymeric compounds (b) having groups reactive toward isocyanates comprise polyetherols.

6 . The process as claimed in claim 1 , wherein the incorporable amine catalysts have, alongside the groups reactive toward isocyanates, one or more tertiary aliphatic amino groups.

7 . The process as claimed in claim 6 , wherein at least one tertiary amino group bears two moieties selected mutually independently from a methyl and an ethyl moiety, and also bears another organic moiety.

8 . The process as claimed in claim 1 , wherein the polyurethane is a polyurethane foam with an average density of from 20 to 850 g/L.

9 . The process as claimed in claim 1 , wherein the polyurethane is a compact polyurethane with an average density of more than 850 g/L.

10 . The process as claimed in claim 9 , wherein the polyurethane is cable-sheathing.

11 . A polyurethane, produced by the process as claimed in claim 1 .

12 . An interior of means of transport, comprising
the polyurethane as claimed in claim 11 .

13 . The process as claimed in claim 1 , wherein the CH-acidic compound (d) comprises more than one CH-acidic group.

Assignees

• Basf Se

Inventors

• Otero Martinez Iran
• Partusch Georg
• Hagen Christian

Classifications

• C08G18/2895 Primary

  Compounds containing active methylene groups · CPC title

• C08G18/14

  Manufacture of cellular products · CPC title

• C08K5/07

  Aldehydes; Ketones · CPC title

• C08J9/0033 Primary

  containing sulfur · CPC title

• C08L75/04

  Polyurethanes · CPC title