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Polypropylene
Polypropylene R&D Technical FAQ Online Inquiry

This section provides a variety of information, from the introduction of PP to processing.

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Technical Information
Business Introduction Products Technical Information
Polypropylene
Polypropylene R&D Technical FAQ Online Inquiry
Technology introduction
Technology introduction PP process Cutting process

Technology introduction

PP
POLYPROPYLENE

Classification according to the PP polymerization status

Homopolymer
Homo PP
Structure : PPPPPPPPPPPPPPPP
Properties : Excellent stiffness, reduced impact resistance
Impact Copolymer
Impact PP
Structure : PPP(EEEPEEPE)PPPP
Properties : Excellent impact resistance, reduced transparency
Random Copolymer
Random PP
Structure : PEPPEEPPPEPEEPPP
Properties : Improved transparency and softness, reduced stiffness and thermal resistance

Classification according to alignment of methyl group bonded to the main carbon chain of PP Isotactic polymer

Isotactic Polymer
Characteristics

Methyl groups aligned in the same direction

Crystallinity with tacticity

Structure
Syndiotactic Polymer
Characteristics

Methyl groups aligned in alternating directions directions directions

Crystallinity with tacticity

Can be produced with metallocene catalyst

Structure
Atactic Polymer
Characteristics

Methyl groups aligned irregularly

Amorphous wax-phase

Structure

Strengths and Strengths of PP

  • Lowest specific gravity
    (specific gravity: 0.90 ~ 0.91)

  • Excellent thermal resistance
    (HDT 100 ˚C or higher)

  • Excellent mechanical properties
    (stiffness, abrasion resistance, etc.)

  • Excellent chemical
    resistance

  • Excellent electrical
    insulation

  • Non-toxic

  • Good processability

  • Low cost

Strengths and weaknesses of PP

  • Poor impact resistance at
    low temperatures
    (except for impact PP)

  • Combustible

  • Somewhat weak
    against UV

  • Poor printability
    and paintability

  • Weak gas barrier

※ Comparison with five kinds of general-purpose resins (PP, HDPE, LDPE, PS, PVC)

Introduction to Compound PP

Process of Compound PP production

A compound PP is a product that allows inorganic substances or other polymers to
be mixed with the PP base to feature properties similar to engineering plastic.

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