	US 11,926,722 B2
	Functionalized particulate bicarbonate as blowing agent, foamable polymer composition containing it, and its use in manufacturing a thermoplastic foamed polymer
Jorge Alejandro Kabbabe Malave, Bourg-la-Reine (FR); Karine Cavalier, Uccle (BE); and Jean-Philippe Pascal, Villers les Nancy (FR)
Assigned to SOLVAY SA, Brussels (BE)
Appl. No. 16/630,527
Filed by Solvay SA, Brussels (BE)
PCT Filed Jul. 20, 2018, PCT No. PCT/EP2018/069727 § 371(c)(1), (2) Date Jan. 13, 2020, PCT Pub. No. WO2019/016355, PCT Pub. Date Jan. 24, 2019.
Claims priority of application No. 17182354 (EP), filed on Jul. 20, 2017; and application No. 18152720 (EP), filed on Jan. 22, 2018.
Prior Publication US 2020/0165402 A1, May 28, 2020
Int. Cl. C08J 9/08 (2006.01); C08J 9/00 (2006.01); C08K 9/04 (2006.01)

CPC C08J 9/08 (2013.01) [C08J 9/0042 (2013.01); C08K 9/04 (2013.01); C08J 2201/03 (2013.01); C08J 2203/02 (2013.01); C08J 2203/12 (2013.01); C08J 2327/06 (2013.01); C08K 2201/005 (2013.01)]

13 Claims

1. A chemical blowing agent for foaming a thermoplastic polymer precursor,

said chemical blowing agent consisting of a functionalized particulate sodium bicarbonate,

wherein the functionalized particulate sodium bicarbonate comprises:

at least 90% by weight and less than 100% by weight of the particulate sodium bicarbonate component,

from 0.02% to 10% by weight of at least one additive which is coated on the surface of the particulate sodium bicarbonate; and

from 1 wt % to 3 wt % of amorphous precipitated silica,

based on the total composition of the functionalized sodium bicarbonate, and

wherein said additive in the functionalized particulate sodium bicarbonate comprises rosin acid, any derivative thereof, any salt thereof, or any combinations thereof; and

wherein the chemical blowing agent provides an expansion ratio of the thermoplastic polymer ranging from 260 to 330%.