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Polyester Dept.

  The major products of the Polyester Dept. are polyethylene terephthalate (PET) and polybutylene terephthalate (PBT). PET resin is the condensation product of terephthalic acid and ethylene glycol, and is used as a material for bottles or sheet film.
  Although PET is a crystalline resin, a transparent product can be obtained without crystallizing if rapid cooling from the molten state is carried out.  For bottle manufacturing, after making the cast of a preform (the shape of a test tube) by injection molding, at the time of the quench the familiar PET bottle shape is molded.

  For sheet manufacturing, a sheet called A-PET is obtained by extrusion molding followed by the quench cooling.  The A-PET sheet is then reheated and formed into a food tray, egg pack, or clear case package, etc. 

  After the quench, further heat treatment and bi-axial stretching improves the polyester film's gas barrier, heat resistance, and dimensional stability properties.    Polyester films are used for food packaging components and various industrial commodities.

  PET resin for bottles is sold by the Japan UniPET company with the brand name of a "Uni-PET."  The rest is sold by Mitsubishi Chemical with the brand name of a "NOVAPEX." Moreover, A-PET sheet is sold with the  brand name "NOVACLEAR." Mitsubishi Chemical takes care of the production and quality control.  Roll products are sold by  Mitsubishi Chemical, while cut board products are sold by J-Film.

  On the other hand, PBT resin is the condensation product of terephthalic acid and 1,4-butanediol (14BG). PBT features a quick crystallization speed  and a short molding cycle.  A "compound" made up of PBT, glass fibers, and fire retardant is used to make parts for the electrical, electronics, and automotive fields.

   PBT resin is sold by Mitsubishi Engineering Plastics with the brand name "NOVADURAN." For details of NOVADURAN see Mitsubishi Engineering Plastics web page.

 NOVADURAN(Mitsubishi Engineering Plastics) web page is here.





 NOVAPEX Material Properties



 Properties

 G2

 G5

 G7

 G9

 I3

 I4

 Method

 Resin
 properties

 Intrinsic
 viscosity

 dL/g

 0.59

 0.75

 0.86

 1.09

 0.89

 0.71

 -

 Color-b

 -

 5

 2

 1

 1

 1

 5

 JIS Z8722

 Thermal
 properties※1

 Tm

 ℃

 250

 250

 248

 247

 210

 -

 DSC

 Tg

 77

 79

 78

 77

 73

 71

 Tc

 163

 172

 177

 -

 -

 -

 Mechanical
 properties
※2

 Tensile
 modulus

 GPa

 2.4

 2.4

 2.4

 2.2

 2.4

 2.9

 JIS K7161

 Stress
 at break

 MPa

 57

 55

 54

 55

 62

 65

 Strain at
 break

 %

 5

 356

 347

 319

 411

 4

 Flexural
 modulus

 GPa

 2.4

 2.3

 2.3

 2.3

 2.4

 2.6

 JIS K7171

 Flexural
 strength

 MPa

 81

 77

 77

 77

 85

 90

 Izod impact
 strength
 (Notched)

 kJ/㎡

 2.4

 4.7

 4.8

 6.0

 2.4

 2.3

 JIS K7110




The data listed here are those obtained under given test conditions representing typical examples of the measurements but not be used to establish specifications limits.
※1:2nd Heat at DSC after quenched resin
※2:ISO type multipurpose test specimen by injection molding



 G: Homo polyethylene terephthalate (polyester) for extrusion and compound
  I: Co-polyester for extrusion and injection



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