Title:
METHOD FOR PRODUCING LOW-SWELLING POLYURETHANE FOAMS, AND USES THEREOF
Document Type and Number:
WIPO Patent Application WO/2019/137879
Kind Code:
A1
Abstract:
The invention relates to a method for producing polyurethane foams, wherein compositions comprising A) isocyanate-functional prepolymers which can be obtained by reacting A1) aliphatic, low-molecular diisocyanates with a molar mass of 140 to 278 g/mol with A2) polyalkylene oxides with an OH functionality of two or more and A3) optionally additional isocyanate-reactive components which do not fall under A2); B) water in a quantity of at least 2 wt.%, based on the total weight of the composition; C) optionally heterocyclic 4-ring or 6-ring oligomers of low-molecular aliphatic diisocyanates with a molar mass of 140 to 278 g/mol; D) optionally catalysts; E) optionally salts of weak acids, the corresponding free acids of which have a pKS value of ≥ 3.0 and ≤ 14.0 in water at 25 °C; F) optionally surfactants; G) optionally mono- or multivalent alcohols or polyols, and H) optionally hydrophilic polyisocyanates which can be obtained by reacting H1) low-molecular aliphatic diisocyanates with a molar mass of 140 to 278 g/mol and/or polyisocyanates which can be produced therefrom with an isocyanate functionality of 2 to 6 with H2) mono-functional polyalkylene oxides with an OH number of 10 to 250 and a proportion of ethylene oxide of 50 to 100 mol.%, based on the total quantity of the obtained oxyalkaline groups, are provided, foamed, and cured. The isocyanate-containing components, in particular the components A, C, and H as a whole have an isocyanate content ranging from 2 to 8 wt.% and a urethane group content of 1.0 to 3.5 mol/kg, in each case based on the total quantity of the isocyanate-containing components. The invention also relates to the foams produced in this manner and to the uses thereof.
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Inventors:
SÜTTERLIN JAN (DE)
WEISER MARC-STEPHAN (DE)
PLUG SASCHA (DE)
DÖRR SEBASTIAN (DE)
STOYE CLAUDINE (DE)
WEISER MARC-STEPHAN (DE)
PLUG SASCHA (DE)
DÖRR SEBASTIAN (DE)
STOYE CLAUDINE (DE)
Application Number:
PCT/EP2019/050272
Publication Date:
July 18, 2019
Filing Date:
January 08, 2019
Export Citation:
Assignee:
COVESTRO DEUTSCHLAND AG (DE)
International Classes:
A61L15/26; A61F13/00; A61L15/42; C08G18/10; C08G18/48; C08G18/72; C08G18/73; C08G18/79; C08G101/00
Domestic Patent References:
| WO2011006608A1 | 2011-01-20 |
Foreign References:
| US20130261200A1 | 2013-10-03 | |||
| US20140107243A1 | 2014-04-17 | |||
| EP2143744A1 | 2010-01-13 | |||
| EP2470580A2 | 2012-07-04 | |||
| EP2585505A1 | 2013-05-01 | |||
| EP2632501A1 | 2013-09-04 | |||
| US9364577B2 | 2016-06-14 | |||
| US5104909A | 1992-04-14 | |||
| EP3235520A1 | 2017-10-25 |
Attorney, Agent or Firm:
LEVPAT (DE)
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