EP 3818092 A1 20210512 - METHOD FOR PRODUCING A POLYURETHANE DISPERSION WITH A REDUCED FOAM FORMATION
Title (en)
METHOD FOR PRODUCING A POLYURETHANE DISPERSION WITH A REDUCED FOAM FORMATION
Title (de)
VERFAHREN ZUR HERSTELLUNG EINER POLYURETHAN-DISPERSION MIT VERRINGERTER SCHAUMBILDUNG
Title (fr)
PROCÉDÉ DE PRODUCTION D'UNE DISPERSION DE POLYURÉTHANE AVEC FORMATION DE MOUSSE RÉDUITE
Publication
Application
Priority
- EP 18181427 A 20180703
- EP 2019067657 W 20190702
Abstract (en)
[origin: WO2020007816A1] The invention relates to a method for producing a polyurethane dispersion, having the steps of: I) providing isocyanate-functional prepolymers A) in a liquid phase comprising a solvent which can be mixed with water and which has a lower boiling point than water and II) adding NCO-reactive compounds to the isocyanate-functional prepolymers from step I) such that a reaction with the prepolymers is at least partly produced; wherein the liquid phase in step I additionally comprises water and/or after step II), water is added to the mixture obtained in step II). A pressure pl is applied to the liquid mixture with the isocyanate-functional prepolymers A) prior to and/or while carrying out step II), wherein pl is less than the local atmospheric pressure present at said point in time. The pressure pl is selected such that in step II), ≤ 50 mass.% (preferably > 0 mass.% to ≤ 40 mass.%, more preferably ≥ 0.1 mass.% to ≤ 30 mass.%, in particular ≥ 1 mass.% to ≤ 10 mass.%) of the originally provided solvent which can be mixed with water is distilled.
IPC 8 full level
C08G 18/75 (2006.01); C08G 18/08 (2006.01); C08G 18/12 (2006.01); C08G 18/32 (2006.01); C08G 18/40 (2006.01); C08G 18/42 (2006.01); C08G 18/48 (2006.01)
CPC (source: EP US)
C08G 18/0866 (2013.01 - EP US); C08G 18/12 (2013.01 - EP US); C08G 18/3234 (2013.01 - EP US); C08G 18/4018 (2013.01 - EP US); C08G 18/4238 (2013.01 - EP US); C08G 18/485 (2013.01 - EP US); C08G 18/755 (2013.01 - EP US)
Citation (search report)
See references of WO 2020007816A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3590989 A1 20200108; CN 112513129 A 20210316; CN 112513129 B 20221227; EP 3818092 A1 20210512; US 2021230347 A1 20210729; WO 2020007816 A1 20200109
DOCDB simple family (application)
EP 18181427 A 20180703; CN 201980044380 A 20190702; EP 19733815 A 20190702; EP 2019067657 W 20190702; US 201916972125 A 20190702