Question 1

What does Acrylates/Steareth-20 Methacrylate Copolymer do in a cosmetic formula?

Accepted Answer

This ingredient is a rheology modifier that thickens water-based formulas and helps suspend particles or stabilize emulsions. It is especially useful in gels, cleansers, shampoos, and lotions where a clear, smooth viscosity is desired.

Question 2

Is Acrylates/Steareth-20 Methacrylate Copolymer clean?

Accepted Answer

From a clean-beauty perspective, this material has friction because it is a synthetic acrylic polymer rather than a readily biodegradable, naturally derived ingredient. It is generally low in skin irritation at finished-formula levels, but clean frameworks often flag it for polymer persistence and residual monomer controls.

Question 3

Is Acrylates/Steareth-20 Methacrylate Copolymer sustainable?

Accepted Answer

This material is typically made from petrochemical-derived monomers and is not considered readily biodegradable. Its environmental profile is mainly limited by persistence rather than acute human-use concerns.

Question 4

Is Acrylates/Steareth-20 Methacrylate Copolymer COSMOS-approved?

Accepted Answer

This ingredient is not permitted under COSMOS-natural or COSMOS-organic standards as a synthetic acrylic polymer. Its Green Chemistry alignment is limited because it relies on non-renewable feedstocks and has poor biodegradability, although it can support efficient thickening at low use levels.

Question 5

How does Acrylates/Steareth-20 Methacrylate Copolymer work chemically?

Accepted Answer

This material is a high-molecular-weight, hydrophobically modified acrylic copolymer with ethoxylated C18 side chains that associate in water to build viscosity. It is often used around 0.5 to 3% as supplied, develops viscosity after neutralization in roughly the mildly acidic to alkaline range, and can lose thickening efficiency with high electrolyte or high solvent loads.