A cationic polyester carrying cinnamamide groups, used as a UV absorber.
What it is
Polyquaternium-59 is, according to its CosIng chemical name, a cationic polymer (polyester) with quaternary ammonium groups that carry a cinnamamide (3-phenyl-2-propenamido) side chain, the part of the molecule that absorbs UV light. CosIng lists it as a UV absorber.
Where it is used
Appears on the ingredient lists of a small number of hair care products.
Limits of interpretation
The INCI list shows which ingredients are present, not how much of each. Above 1%, ingredients are listed in descending order of weight; below 1% the order is free.
Polyquaternium numbers are assigned in order of registration and do not describe the structure; the label does not show the amount used.
Functions
- UV absorber
- Protecting the cosmetic product from the effects of UV-light.
EU regulation
This ingredient is not listed in the annexes of Regulation (EC) No 1223/2009 in the CosIng data.