CORTERRA* is the trade name for
polytrimethylene terephthalate (PTT), a thermoplastic that can be spun
into both fibers and yarns and has extensive applications in carpeting,
textiles and apparel, engineering thermoplastics, non-wovens, films and
CORTERRA Polymers combines the best properties of nylon and polyester.
Whether used in carpet, apparel, home furnishings or automotive fabrics,
CORTERRA Fibers look better longer.
Compared with other synthetic fibers like nylon and acrylic, CORTERRA
Fibers feel softer, dye easier, retain vibrant colors longer, stretch and
recover better. More important, CORTERRA Fibers resist staining, clean
easily and dry quickly.
PTT was first patented in 1941, but it was not until the 1990s, when Shell
Chemicals developed the low-cost method of producing high-quality
(PDO)1,3-propanediol, the starting raw material for PTT, that commercial
production of CORTERRA Polymers was possible.
Shell Chemicals has introduced CORTERRA*
Polymers, a revolutionary product line. CORTERRA
Polymer is an aromatic polyester known generically as PTT, (polytrimethylene
terephthalate). PTT is produced by the poly-condensation reaction of PTA
(purified terephthalic acid) and PDO (1,3 propanediol) and has unique
properties as compared to the other aromatic polyesters, PET (polyethylene
terephthalate) and PBT (polybutylene terephthalate).
The unique properties of PTT have
been known for many years but the polymer has not been commercially
available because of the high cost of production of the PDO raw material.
Extensive research effort by Shell Chemicals has resulted in a
cost-effective process to manufacture PDO. With this breakthrough in
processing technology for PDO, CORTERRA Polymers are
now commercially available for use in carpet fiber, textile fiber,
monofilament, film, non-woven fabric, and
engineering thermoplastic applications.
||up to .. cN/tex
||max. 0,2 %
|Effects to heat
||ironing temperature ...° C
melts at 228° C
- resistant to stretching
- quick drying
- wrinkle resistant
- able to retain heat-set pleats and creases
- easily washed
Yarns made with CORTERRA Polymers can bring
together the most appealing advantages, all in a single fiber. Fabrics
made from CORTERRA Fibers not only offer easy-care and stretch, but a
combination of features that include inherent stain resistance, lasting
durability for longer wear, remarkable softness, beautiful fluid drape and
rich brilliant colors. There also are benefits for textile manufacturers:
CORTERRA Fibers dye well at low temperatures, blend well with other
fibers, and are less expensive and much easier to work with than spandex
||For every form of clothing
such as casual, swimwear, active wear and innerwear
||carpets, draperies, sheets
and pillow cases, wall coverings and upholstery
Fabrics made with CORTERRA Fibers have
great appeal in the fast-growing stretch market. Unlike other stretch
fabrics, these easy-care fabrics offer a combination of features that
include the softness of nylon, beautiful drape and brilliant colors.
- POY yarns
- flat yarn
- textured yarn
- high tenacity
- staple fibers
- spun yarns
What is CORTERRA?
CORTERRA* is the
trade name for polytrimethylene terephthalate (PTT), a thermoplastic that
can be spun into both fibers and yarns. PTT belongs to a class of polymers
called aromatic polyesters. However, CORTERRA Polymer is a unique product
in that it behaves very differently than other polyesters.
In both carpet and textile markets, CORTERRA Polymers combine the chemical
resistance characteristics that you can get from a polyester with the
elastic recovery and resilience of nylon. CORTERRA Polymers also offer
inherent stain resistance, are continuously printable and dyeable without
specialty chemicals in a full color range, have good colorfastness against
UV light, ozone and NOx, provide low water absorption and low
electrostatic generation, and have the potential to be recycled, pending
development of post-consumer recycling programs.
Many of these same properties make CORTERRA Polymers good candidates for
conversion into film, non-woven fabric and monofilament. For engineering
thermoplastic applications, CORTERRA Polymers can be compounded to provide
performance properties and processing characteristics that are similar to
polybutylene terephthalate (PBT).
How, when, and by
whom were CORTERRA Polymers or PTT discovered?
PTT was first
patented in 1941 by Britons John Rex Whinfield and James Tennant Dickson,
two scientists with Calico Printing Ink, who were conducting a basic
research program on polyesters.
Although the advantages of PTT have been known since the 1940s, PTT was
never commercialized due to the nonavailability of a low cost source of
the starting raw material, propanediol (PDO). Shell Chemicals was the
first company to manufacture PDO, starting in the 1960s. In the early
1990s, Shell Chemicals developed an innovative means of producing PDO
economically through continuous ethylene oxide (EO) hydroformylation
How does CORTERRA
compare with other fibers?
the best properties of nylon and polyester. Whether used in carpet,
garments, home furnishings or automotive fabrics, CORTERRA Fibers look
better longer. Compared with other synthetic fibers like nylon and
acrylic, CORTERRA Fibers feel softer, dye easier, retain vibrant colors
longer, stretch and recover better. More important, CORTERRA Fibers resist
staining, clean easily and dry quickly
Why is CORTERRA
"the fiber of the future"?
It is the first
significant new material in the textile and carpet industry for some time.
It provides manufacturers with a wider range of options for new products
than they have now. As a stain- and static-resistant material, for
example, CORTERRA PTT has those properties built in. These properties are
not the result of additives. In carpeting, CORTERRA Fibers feel like wool
and perform equal to or better than nylon 6,6. But they hold dyes much
better, and that means manufacturers will have a wider color spectrum to
chose from and produce carpets with a lasting, visual beauty. In apparel,
CORTERRA Fibers offer performance that is equal to or better than nylon
6,6 and PET, including comfort fit due to superior stretch and recovery,
excellent drape and softness and easy care due to stain resistance and a
choice of care procedures.
The target of PTT
(and PBT) is not to take market share for PA or PP but to change the
consumers perception of polyester in general, to regain market share
partially lost by polyesters previously poor image. Once textured:
- PTT will have
slightly more power stretch and recovery than PBT and more than PA 66,
PA 6 and PES
- PBT will have the
best soft hand of all, as PBT will be close to PES
- both can be
easily dyed at 100°C and can be mixed with other fibers. They will
offer stain resistance, chlorine resistance and a good resilience
Tensile Strength (cN/dtex)
3.4 – 3.7
at break (%)
Young’s modulus (cN/dtex)
recovery from 20% elongation (%)
transition point (°C)
loss of strength
loss of strength
loss of strength
loss of strength, yellowing under some conditions
resistance (w/exposure to NOX-BHT, vanillin, and dry heat)
under some conditions
filament yarns at similar dtex per filament are softer than PET – they
are as soft as PA
comparison (+2 best/ -2 worst):
PA 6/PA 6.6 +1
PTT 3 dtex per filament is as soft as a PET with 2 dpf
filaments are less resilient, a compromise between stretch and softness is