Introduction
CPP (Chlorinated Polypropylene) is a thermoplastic resin produced through the chlorination modification of polypropylene. By introducing chlorine atoms, CPP gains polar structures that effectively improve the adhesion and film-forming properties of raw polypropylene, leading to widespread applications in inks, coatings, and adhesives. CPP was first developed in the 1960s by Hercules Powder Company in the United States, and was subsequently promoted to global markets by enterprises such as Eastman and Nippon Paper Industries.
Structure & Physical Properties
Appearance : White or light yellow granules/powder
Polarity : Possesses moderate polarity after chlorination modification, offering compatibility with a wide range of resins
Solubility : Soluble in aromatic hydrocarbons, esters, and ketones; insoluble in ethanol and petroleum ether
Resistance : Demonstrates water resistance, acid resistance, oil resistance, and light resistance
Film-Forming Ability : Transparent, flexible, and resistant to embrittlement/cracking, making it ideal for film applications
Chlorine Content & Classification
CPP is classified into two main types based on chlorine content:
| Type | Chlorine Content (%) | Characteristics & Applications |
|---|---|---|
| Low Chlorination | 20–40% | Excellent film-forming properties; suitable for printing inks and primers |
| High Chlorination | 63–67% | Strong adhesion; suitable for metals and special substrates |
Technical Tips | Precautions for Selecting CPP
The performance of CPP resin varies depending on chlorine content, molecular weight, and solvent selection.
When formulating printing inks or coatings, it is recommended to use ester or aromatic solvents to ensure dissolution stability.
JUYEE provides low chlorination CPP products (chlorine content approx. 24–40%) and does not supply high chlorination grades.
For further confirmation on compatibility or formulation recommendations, please refer to our CPP product pages.