US 12,357,548 B2
Sunscreen formulations comprising an oleosome suspension and an acidic buffering system
Soo In Yang, Calgary (CA); Shuanghui Liu, Calgary (CA); Geoffrey Brooks, Reno, NV (US); and Yves Lanctot, Deux-Montagnes (CA)
Assigned to BOTANECO INC., Calgary (CA)
Appl. No. 16/092,750
Filed by BOTANECO INC., Calgary (CA)
PCT Filed Apr. 13, 2017, PCT No. PCT/CA2017/050459
§ 371(c)(1), (2) Date Oct. 10, 2018,
PCT Pub. No. WO2017/177334, PCT Pub. Date Oct. 19, 2017.
Claims priority of provisional application 62/322,941, filed on Apr. 15, 2016.
Prior Publication US 2019/0105248 A1, Apr. 11, 2019
Int. Cl. A61K 8/14 (2006.01); A61K 8/35 (2006.01); A61K 8/37 (2006.01); A61K 8/92 (2006.01); A61Q 17/04 (2006.01)
CPC A61K 8/14 (2013.01) [A61K 8/35 (2013.01); A61K 8/37 (2013.01); A61K 8/922 (2013.01); A61Q 17/04 (2013.01)] 24 Claims
 
1. A sunscreen formulation for preparing a personal care product, the sunscreen formulation buffered to a pH from about pH 3 to about pH 6 and comprising:
one or more sunscreen active ingredients; and
a buffered oleosome suspension at a pH from about pH 3 to about pH 6, the buffered oleosome suspension comprising a weak acid, a strong base, and at least 90% w/w oleosomes, wherein the weak acid and the strong base form a buffering system to buffer the oleosome suspension at the pH from about pH 3 to about pH 6,
wherein the buffering system has a buffering capacity within the pH range of from about pH 3 to about pH 6 of at least 0.01 and it is the buffering system of the oleosome suspension that buffers the sunscreen formulation to the pH from about pH 3 to about pH 6.