	US 11,851,583 B2
	Process for producing porous polyurethane coatings using polyol ester additives
Michael Klostermann, Essen (DE); Martin Glos, Borken (DE); Jan Marian Von Hof, Bochum (DE); Verena Dahl, Bergisch Gladbach (DE); Christian Eilbracht, Herne (DE); Oliver Springer, Wesel (DE); and Hans Henning Wenk, Mülheim an der Ruhr (DE)
Assigned to Evonik Operations GmbH, Essen (DE)
Appl. No. 16/315,744
Filed by Evonik Operations GmbH, Essen (DE)
PCT Filed Jul. 13, 2017, PCT No. PCT/EP2017/067655 § 371(c)(1), (2) Date Jan. 7, 2019, PCT Pub. No. WO2018/015260, PCT Pub. Date Jan. 25, 2018.
Claims priority of application No. 16180041 (EP), filed on Jul. 19, 2016.
Prior Publication US 2019/0300728 A1, Oct. 3, 2019
This patent is subject to a terminal disclaimer.
Int. Cl. B05D 5/00 (2006.01); B05D 3/02 (2006.01); C09D 7/65 (2018.01); C09D 7/45 (2018.01); C09D 7/47 (2018.01); C09D 5/00 (2006.01); C09D 175/06 (2006.01); D06N 3/00 (2006.01); D06N 3/14 (2006.01); C08L 75/04 (2006.01); C09D 175/04 (2006.01)

CPC C09D 7/65 (2018.01) [B05D 3/0254 (2013.01); B05D 5/00 (2013.01); C08L 75/04 (2013.01); C09D 5/00 (2013.01); C09D 7/45 (2018.01); C09D 7/47 (2018.01); C09D 175/04 (2013.01); C09D 175/06 (2013.01); D06N 3/0047 (2013.01); D06N 3/14 (2013.01); B05D 2320/00 (2013.01); B05D 2503/00 (2013.01); C08L 2201/54 (2013.01)]

14 Claims

1. A process for producing a porous polyurethane coating, the process comprising the steps of:

a) providing a mixture comprising an aqueous polyurethane dispersions having a solids content of from 20 to 70% by weight, a concentration of polyglycerol ester in the aqueous polyurethane dispersion in the range of from 0.2-15% by weight based on the total weight of the aqueous polyurethane dispersion, and an additive;

wherein the polyglycerol ester is of general formula 1:

M_aD_bT_c Formula 1

where

M=[C₃H₅(OR′)₂O_1/2]

D=[C₃H₅(OR′)₁O_2/2]

T=[C₃H₅O_3/2]

a=2 to 10,

b=0 to 10,

c=0 to 3,

wherein the R′ radicals are independently identical or different radicals of R″—C(O)— or H,

wherein R″ is a monovalent aliphatic saturated or unsaturated hydrocarbyl radical having from 3 to 39 carbon atoms,

wherein at least one R′ radical corresponds to a radical of R″—C(O)—;

b) foaming the mixture to give a cell foam;

c) adding at least one thickener to establish the desired viscosity of the wet foam;

d) applying a coating of the foamed polymer dispersion to a carrier;

e) after performing step d), and without any intervening steps, drying the coating,

wherein the porous polyurethane coating has a mean cell size less than 150 μm.