Process for the production of polyurethane foams

• US 3,993,606 A
• Filed: 11/06/1974
• Issued: 11/23/1976
• Est. Priority Date: 06/06/1974
• Status: Expired due to Term

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: Kleimann, Helmut, VON Bonin, Wulf, DE Montigny, Armand, Ivanyi, Jozsef
• Primary Examiner(s): Ivy, C. Warren
• Application Number:
  US05/521,424
• Time in Patent Office: 748 Days
• Field of Search: 260/2.5 AH, 260/2.5 AC, 260/2.5 AZ, 264/300
• US Class Current: 521/111
• CPC Class Codes: C08G 77/388 containing nitrogen
• CPC Class Codes: C08J 2375/04 Polyurethanes
• CPC Class Codes: C08J 2483/00 Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
• CPC Class Codes: C08J 9/0061 characterized by the use of several polymeric components

Abstract

The mold release properties of a molded polyurethane foam are improved by including in the foamable reaction mixture to be molded a salt of a polysiloxane which contains amino groups and a fatty acid.

Claims

1. In a process for producing a foam plastic which readily separates from the mold in which it had been found wherein a foamable reaction mixture contains an organic polyisocyanate, an organic compound having a molecular weight of about 62 to about 10,000 which contain reactive hydrogen atoms, a catalyst for the isocyanate - reactive hydrogen reaction and a blowing agent;

is charged to the mold and reacted, the improvement which comprises including in the reaction mixture salts of polysiloxanes which contain amino groups of the formula ##EQU1## wherein n is an integer from 4 to 20 and

R stands for aliphatic hydrocarbon radical having 1 to 4 carbon atoms or a cyclohexyl radical; and

fatty acids with more than 7 carbon atoms to improve the mold release properties of the resulting molded product, 50 - 200 mol % of fatty acid being used per mol of amino groups.

2. Process according to claim 1, wherein the fatty acids used are oleic acid or commercial fatty acid mixtures which contain this acid.

3. Process according to claim 1, wherein the polysiloxanes with amino groups used are amino group-containing methyl polysiloxanes which have 5 to 80 Si-atoms.