PBT (Polybutylene terephthalate)

 

Polybutylene terephthalate (PBT) is a semi-crystalline thermoplastic material belonging to the polyester family. It's produced by the polymerization of butadiene and terephthalic acid. PBT differs chemically from PET in its number of -CH2 groups. The mechanical characteristics of the two materials are similar but slightly lower for PBT. Both materials are subject to hydrolytic degradation but PBT has a low moisture absorption. Unlike PET this material crystallizes quickly and without the need for nucleating agents. Furthermore, compared to PET, this material has a melting temperature of Tm (approx 224 ° C) and a lower glass transition temperature of Tg (22-43 ° C). The advantage of lower processing temperatures is off-set by lower heat distortion temperatures.

Chemical Formula PBT: (C12H12O4)n
CAS Number PBT: 24968-12-5
Chemical Name PBT (IUPAC): Poly(oxy-1,4-butanediyloxycarbonyl-1,4-phenylenecarbonyl)
Recycling Code PBT: number 7
Recycling Symbol PBT: simbolo riciclo PBT

PBT Commercial names and producers

 

  • Anjadur (almaak international)
  • Arnite (DSM)
  • Badadur (Bada)
  • Bergadur (PolyOne / Bergmann)
  • Celanex (Celanese)
  • Crastin (DuPont)
  • DIC PBT (Dai Nippon Japan)
  • Duranex (Polyplastics)
  • Enduran (Sabic)
  • Gebadur (Geba)
  • Infino (Samsung Lotte)
  • Isodur (Sirmax)
  • Lupox (LG Chemicals)
  • Pibiter (So.F.Ter)
  • Pocan (Lanxess)
  • Polyshine (Polykemi)
  • Raditer (Radici)
  • Saxadur (Sax Polymers)
  • Schuladur (Schulman)
  • Staren (Samsung)
  • Ultradur (BASF)
  • Valox (Sabic)
  • Vestodur (Evonik)

PBT European Distributors:

 

  • BIGLER (Raditer, Radiflam B, Pibifor)
  • XIFA (Valox, Xenoy)
  • Schulman (Schuladur, QR Resin, Polyflam, Matrixx, Lucent PC, Ecollent, Diamaloy)
  • Mega Polymers (Arnite, Celanex, Crastin, Kebater, Pocan, Radiflam, Ultradur, Valox, Vestodur)
  • Tekuma (Infino)
  • KD Feddersen (Precite, Celanex, Vandar)
  • PolyOne (Crastin, Edgetecl, Gravi-tech, LubriOne, Trilliant)
  • ALBIS (Alcom, Altech, Pocan, Ultradur, Makroblend )
  • Biesterfield (Crastin)
  • Nexeo (Colorfast, Electrafil, Enviroplas, HiFill, Colorcomp, Lubricomp, Thermocomp, Pocan, Ultradur, Valox)
  • RESINEX (Arnite, Celanex)
  • Ultrapolymers (Ultradur, Later, Latilub, Luvocom, Thermocomp, Valox, Colorcomp, Lubricomp, Stat-kon, Tribit)
  • TER Plastics (Arnite T, CCP PBT, Terez PBT,)

Main compounds with PBT:

 

  • PBT/PC (Blend Polybutylene terephthalate Polycarbonate)
  • PBT/ASA (Blend Polybutylene terephthalate acrylic styrene acrylonitrile )
  • PBT/PET (Blend Polybutylene terephthalate PolyethyleneTerephthalate)
  • PBT-GF30 (Polybutylene terephthalate fibre glass 30%)
  • PBT-GF15FR (PolibutilenTereftalato fibre glass 15% with flame retardant)
 

Chemical and physical properties:

It is a semi-crystalline material with excellent chemical resistance, mechanical rigidity, exceptional electrical properties (high dielectric strength and insulation resistance) and heat resistance, properties that remain stable in a wide range of environmental conditions.
Compared to Polyamide, PBT technopolymers have a greater specific weight, lower melting point, greater dimensional stability due to the low influence of humidity variations, and lower impact resistance.
PBT and PET are sensitive to aging via the action of UV rays and must be adequately shielded if used outdoors.

History of PBT

The preparation of the first polyester resin dates back to Berzelius, Gay-Lussac and Pelouze in 1847 and 1883 when its first application was for a surface coating. At that time the resin was known as alkyd (alcohol + acid). PBT officially debuted on the market more or less along with PET around 1970 and was presented as a plastic engineering material.

PBT standard density: 1,24 – 1,34 g/cm3 (ISO 1183)
PBT melting point Tm: 220 °C
PBT glass transition temperature Tg: 22 - 43 °C

 

PBT application markets

 

  • Electrical appliances
  • Electrical components
  • Automotive

PBT transformation technologies

 

  • Injection molding
  • Extrusion
  • Film
  • Filaments
  • Rotating molding

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Compound

PBT-GF30 polybutylene terephthalate

First choice - Virgin QUALITY-PRIME QUALITY-PRIME

LUPOX GP2300
granule/pellet Natural / Neutral 3000 Kg bags on pallet 4.00 €/Kg

Compound

PBT-GF30 polybutylene terephthalate

First choice - Virgin QUALITY-PRIME QUALITY-PRIME

Deniter 3010
granule/pellet Light blue 375 Kg bags on pallet 2.00 €/Kg

Compound

PBT-GF30 polybutylene terephthalate

First choice - Virgin QUALITY-PRIME QUALITY-PRIME

LUPOX GP2306F
cylindrical granule/pellet Natural / Neutral 10000 Kg bigbag 1.000-1.100 kg 4.85 €/Kg

Compound

PBT-GF10 FR polybutylene terephthalate

First choice - Slow moving QUALITY-PRIME QUALITY-PRIME

CRASTIN T841 FR BK851
granule/pellet Black 2000 Kg bags on pallet 3.25 €/Kg

Compound

PBT FR polybutylene terephthalate

First choice - Slow moving QUALITY-PRIME QUALITY-PRIME

CELANEX X680
granule/pellet Natural / Neutral 250 Kg bags on pallet 1.00 €/Kg

Polymer

PBT polybutylene terephthalate

First choice - Virgin QUALITY-PRIME QUALITY-PRIME

LUPOX GP1000M
granule/pellet Natural / Neutral 3000 Kg bags on pallet 4.43 €/Kg

Polymer

PBT polybutylene terephthalate

Recycled SRM /Regrinded / Industrial By-Product / Industrial compound QUALITY-RECYCLED QUALITY-RECYCLED

Valox 312
regrinded Natural / Neutral 10000 Kg bigbag 1.000-1.100 kg 1.80 €/Kg
 

Compound

PBT-GF30 polybutylene terephthalate

LUPOX GP2300

3000 Kg 4.00 €/Kg

Compound

PBT-GF30 polybutylene terephthalate

Deniter 3010

375 Kg 2.00 €/Kg

Compound

PBT-GF30 polybutylene terephthalate

LUPOX GP2306F

10000 Kg 4.85 €/Kg

Compound

PBT-GF10 FR polybutylene terephthalate

CRASTIN T841 FR BK851

2000 Kg 3.25 €/Kg

Compound

PBT FR polybutylene terephthalate

CELANEX X680

250 Kg 1.00 €/Kg

Polymer

PBT polybutylene terephthalate

LUPOX GP1000M

3000 Kg 4.43 €/Kg

Polymer

PBT polybutylene terephthalate

Valox 312

10000 Kg 1.80 €/Kg