US 12,110,373 B2
Non-hazardous water-based polyurethane dispersion
Craig Evans, Greater Manchester (GB); Neil Carter, Southport (GB); and Ian Martin, Barrow (GB)
Assigned to SIKA TECHNOLOGY AG, Baar (CH)
Filed by SIKA TECHNOLOGY AG, Baar (CH)
Filed on Oct. 28, 2020, as Appl. No. 17/082,143.
Application 17/082,143 is a division of application No. 15/776,539, abandoned, previously published as PCT/EP2016/082048, filed on Dec. 21, 2016.
Claims priority of application No. 15202177 (EP), filed on Dec. 22, 2015.
Prior Publication US 2021/0054229 A1, Feb. 25, 2021
Int. Cl. B05D 1/00 (2006.01); C08G 18/08 (2006.01); C08G 18/10 (2006.01); C08J 7/043 (2020.01); C08J 7/046 (2020.01); C09D 175/04 (2006.01); C09D 175/12 (2006.01)
CPC C08J 7/043 (2020.01) [B05D 1/00 (2013.01); C08G 18/0847 (2013.01); C08G 18/10 (2013.01); C08J 7/046 (2020.01); C09D 175/04 (2013.01); C09D 175/12 (2013.01); B05D 2401/20 (2013.01); B05D 2503/00 (2013.01)] 6 Claims
 
1. A method comprising:
introducing a coalescent comprising 2,5,7,10-tetraoxaundecane into a water-based polyurethane dispersion such that the 2,5,7,10-tetraoxaundecane is present in the water-based polyurethane dispersion in an amount of 10% to 40% by weight based on the total weight of a chain-extended polyurethane in the water-based polyurethane dispersion;
applying the water-based polyurethane dispersion to a surface of a plastic substrate or a rubber substrate to coat the plastic substrate or the rubber substrate such that a thickness of the coating is in the range of 50 microns to 3 mm, wherein the water-based polyurethane dispersion is applied to the plastic substrate or the rubber substrate at a temperature below 30° C.; and
forming a film at a temperature below 30° C. on the plastic substrate or the rubber substrate by evaporation of water of the applied water-based polyurethane dispersion,
wherein the water-based polyurethane dispersion is a rigid polyurethane dispersion, and
wherein the rigid polyurethane dispersion is based on an isocyanate-terminated polyurethane prepolymer that is a reaction product of: (i) a polyester polyol and/or a polycarbonate polyol, (ii) dimethylol propionic acid (DMPA), and (iii) bis(4-isocyanatocyclohexyl) methane, and is chain extended by a polyamine.