Patent ID: 11926722
Assignee: SOLVAY SA
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
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%.