Polymer modifiers broadly refer to additives or secondary polymers used to tailor the properties of a base polymer—such as flexibility, clarity, adhesion, or chemical resistance. These can include elastomers, compatibilizers, or functional copolymers.
They are used across nearly all industries, from packaging to automotive to electronics. For example, compatibilizers enable blending of otherwise incompatible polymers (like PE and PET). The advantage is customization—allowing manufacturers to design materials with highly specific performance profiles.