US 12,441,893 B2
Metal coated with a functional polypropylene film
Houxiang Tang, Midland, MI (US); David L. Malotky, Midland, MI (US); Nicholas B. Schaffer, Midland, MI (US); Hanze Ying, Midland, MI (US); Bernhard U. Kainz, Lauf (DE); Cynthia A. Stants, Coleman, MI (US); Luqing Qi, Midland, MI (US); Ray E. Drumright, Midland, MI (US); and Jonathan F. Mason, Midland, MI (US)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 18/251,777
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Dec. 2, 2021, PCT No. PCT/US2021/061570
§ 371(c)(1), (2) Date May 4, 2023,
PCT Pub. No. WO2022/140033, PCT Pub. Date Jun. 30, 2022.
Claims priority of provisional application 63/128,309, filed on Dec. 21, 2020.
Prior Publication US 2024/0002673 A1, Jan. 4, 2024
Int. Cl. C09D 5/08 (2006.01); C09D 5/02 (2006.01); C09D 7/45 (2018.01); C09D 7/63 (2018.01); C09D 123/14 (2006.01); C09D 123/30 (2006.01)
CPC C09D 5/08 (2013.01) [C09D 5/027 (2013.01); C09D 7/45 (2018.01); C09D 7/63 (2018.01); C09D 123/14 (2013.01); C09D 123/30 (2013.01)] 11 Claims
 
1. A process for preparing a coated metal substrate comprising the steps of:
a) applying onto a metal substrate an aqueous dispersion composition consisting of:
i) 1 to 15 weight percent, based on the weight of polymer solids in the dispersion, a fatty acid dispersant of 14 to 60 carbon atoms with an acid value in the range of 60 to 250;
ii) from greater than 25 weight percent to less than 70 weight percent, based on the weight of polymer solids in the dispersion, an acid functionalized propylene base copolymer with an acid value in the range of 0.5 to 20 and a melting point at or above 130° C. as determined by DSC;
iii) 15 to 60 weight percent, based on the weight of polymer solids in the dispersion, a non-functionalized propylene-co-alkene base copolymer;
iv) 2 to 15 weight percent, based on the weight of polymer solids in the dispersion, a functionalized polyolefin wax with an acid value in the range of 25 to less than 60;
v) a neutralizing agent which is an organic base or volatile base having a boiling point of less than 250° C.; and
vi) water; and
b) curing the composition by heating or allowing the composition to set to produce a cured film having a thickness in the range of 1 μm to 20 μm.