	US 11,746,195 B2
	Process for forming a powder
Craig F. Gorin, Midland, MI (US); Sanjib Biswas, Lake Jackson, TX (US); Yi Fan, Midland, MI (US); Thomas L. Tomczak, Midland, MI (US); Daniel L. Dermody, Midland, MI (US); and Harpreet Singh, Lake Jackson, TX (US)
Appl. No. 16/758,245
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Oct. 22, 2018, PCT No. PCT/US2018/056839 § 371(c)(1), (2) Date Apr. 22, 2020, PCT Pub. No. WO2019/083873, PCT Pub. Date May 2, 2019.
Claims priority of provisional application 62/576,907, filed on Oct. 25, 2017.
Prior Publication US 2020/0339763 A1, Oct. 29, 2020
Int. Cl. B29B 9/12 (2006.01); B29B 9/16 (2006.01); C08J 3/12 (2006.01); C08L 23/08 (2006.01); B29K 33/00 (2006.01); B33Y 70/00 (2020.01)

CPC C08J 3/124 (2013.01) [B29B 9/12 (2013.01); B29B 9/16 (2013.01); C08L 23/0815 (2013.01); B29B 2009/125 (2013.01); B29B 2009/163 (2013.01); B29B 2009/168 (2013.01); B29K 2023/04 (2013.01); B29K 2033/08 (2013.01); B29K 2033/12 (2013.01); B33Y 70/00 (2014.12); C08J 2323/08 (2013.01); C08L 2201/54 (2013.01)]

15 Claims

1. A process comprising:

(i) providing a polyolefin aqueous dispersion having from 50 wt % to 90 wt % solids content of dispersion, the polyolefin aqueous dispersion comprising

(a) solid particles comprising

a polyolefin comprising an ethylene-based polymer having a melting temperature from greater than 115° C. to 140° C.;

a polyolefin wax;

an acrylic dispersant;

(b) an aqueous phase comprising excess acrylic dispersant;

(ii) adding diluting water to the polyolefin aqueous dispersion to form a diluted polyolefin aqueous dispersion having from 5 wt % to less than 50 wt % solids content of dispersion;

(iii) collecting the solid particles from the diluted polyolefin aqueous dispersion;

(iv) washing the solid particles with a washing agent to remove the excess acrylic dispersant; and

(v) removing the washing agent to form a powder, the powder having a mean volume average particle size from 10 μm to 300 μm, a sphericity from 0.92 to 1.0, a particle size distribution from 1 to less than 2, a particle density from 98% to 100%, and a flow rate in a large funnel from 1 sec to 5 sec.