Types and characteristics

There are three types of PP as shown in the table: homopolymer, random copolymer and block copolymer.

Out of them, homopolymer is made up of 100% PP and has excellent rigidity and heat resistance. On the other hand, PP shows inferior low-temperature impact resistance, but can be improved through copolymerization with a monomer such as ethylene. Furthermore, since it is possible to add various subsidiary materials such as glass fiber to PP, it is possible to make materials having physical properties meeting specific purposes.

These PP resins are used for a broad range of applications such as automotive parts, home appliances and industrial uses.

Polymerization method Single polymerization Copolymerization  
Classification Homopolymer Random copolymer Block copolymer Filling of an inorganic filler
Molecular structure

n>m

Homopolymer + PE + PP PP + Filer
Melting point 160 - 165°C 135 - 150°C 160 - 165°C -
Rigidity
Impact strength
Transparency Translucent Transparent Translucent Opaque
Characteristics

• Light

• High heat resistance temp

• Excellent chemical resistance

• High bending fatigue strength (hinging resistance properties)

• Improved transparency, heat sealability and impact strength of homo PP • Significantly improved low-temperature impact resistance of homo PP

• Improved rigidity at high temp

• Low yield

Main applications

Injection molding

Film

Daily goods

Sheets

Film

Transparent injection moldings

Home appliances
Automobiles

Industrial materials

Home appliances
Automobiles

Industrial materials