chemistry

Tritan copolyester

Tritan copolyester is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Tritan copolyester rather than just read about it. In short: Tritan, a copolymer offered by the Eastman Chemical Company since 2007, is a transparent plastic intended to replace polycarbonate, because of health concerns about Bisphenol A (BPA). Tritan is a copolymer made from three monomers: dimethyl terephthalate (DMT), cyclohexanedimethanol (CHDM), and 2,2,4,4-Tetramethyl-1,3-cyclobutanediol (CBDO).

Key takeaways

Tritan copolyester belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Tritan copolyester to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Tritan copolyester from memory before moving on to harder problems.

Reference excerpt

Tritan, a copolymer offered by the Eastman Chemical Company since 2007, is a transparent plastic intended to replace polycarbonate, because of health concerns about Bisphenol A (BPA). Tritan is a copolymer made from three monomers: dimethyl terephthalate (DMT), cyclohexanedimethanol (CHDM), and 2,2,4,4-Tetramethyl-1,3-cyclobutanediol (CBDO). Tritan or Poly Cyclohexylenedimethylene Terephthalate Glyco (PCTG) is made without using any bisphenols or phthalate plasticizers. Compared to similar resins, Eastman says Tritan has improved resistance to heat and chemicals, with less degradation in conditions such as dishwashing, microwaving, and when used with hot beverages. In April 2008, Nalgene announced it would phase out production of its outdoor line of polycarbonate containers containing the chemical bisphenol A. Nalgene now uses Tritan as a replacement for polycarbonate, as it does not contain BPA.

Toxicology & Health controversy In 2011, a neurobiologist at the University of Texas at Austin, George Bittner, published an article claiming that most polymers, including Tritan, contained other materials with estrogenic activity. Bittner published the article eleven years after he founded the company PlastiPure to develop safer plastics. After these claims were repeated by Bittner's company PlastiPure, Tritan's inventor, the Eastman Chemical Company, sued PlastiPure. A jury ruled in Eastman's favor, and the Court barred PlastiPure from making claims about Tritan's estrogenic activity. In expert testimony, Wade Welshon of the University of Missouri-Columbia, agreed that the Tritan copolymer is likely not estrogenic, but that the estrogenic activity he found in five separate tests of Tritan products could be attributable to other chemicals added during manufacturing. During the trial it emerged that Thomas Osimitz — who authored the journal article that had initially cleared Tritan of estrogenic activity — was paid $10,000 by the company for the paper, which was not disclosed in the Conflict of Interests section. Osimitz was questioned about this by Reuters, stating that the disclosure forms were "very confusing." Bittner maintains that his assays are more sensitive than the ones performed by Osimitz et al. Since then, other work has shown that like other polymers, certain additives or impurities present in Tritan can migrate from the plastic into water held in a container made of the material. Among these are 2-phenoxyethanol (CAS 122-99-6 ), dimethyl isophtalate (CAS 1459-93-4 ), 4-nonylphenol (CAS 104-40-5 ), bisphenol A (CAS 80-05-7 ) and butyl benzyl pthalate (CAS 85-68-7 ). However, these were found in concentrations well below levels permissible by European Union regulations.

Similar products Other manufacturers have developed similar products including the French Arc Holdings's Kwarx since 2006, the German Glaskoch (Leonardo) Teqton since 2009 and the South-Korean SK Chemicals' Ecozen, a glycol-modified polyethylene terephthalate (PETG) since 2010/2011. Other manufacturers propose polypropylene (PP) or methylstyrene (MS) as alternatives to Tritan.

Name confusion

Tritan can also refer to a type of so called unbreakable glass originally developed by the German Zwiesel Kristallglas in 2002 together with University of Erlangen–Nuremberg. Its name is derived from titanoxide (titanium oxide in English). In 2012, the Zwiesel Kristallglas company introduced Tritan Protect. Confusingly, although both are unrelated, Zwiesel Tritan glass and Eastman Tritan copolyester are both advertised as "shatter protected" and are used in the production of drinking glasses as replacements for traditional glasses, despite their different material properties.

See also Superfest (a chemically hardened glass also known as Ceverit or CV-Glas) Gorilla Glass Borosilicate glass (a type of heat-resistant glass) Microplastics

References

Illustrations

Worked examples

Example 1 — a first encounter with Tritan copolyester

Start with the simplest possible case. Write down what Tritan copolyester claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Tritan copolyester before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Tritan copolyester ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Tritan copolyester

In research: Tritan copolyester appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Tritan copolyester in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Tritan copolyester is common in secondary-school and first-year university syllabi. It links to neighbouring topics Commodity chemicals, Plastics, Thermoplastics, so understanding it makes those chapters shorter.
In everyday life: Look for Tritan copolyester outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Tritan copolyester in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Tritan copolyester means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Tritan copolyester out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Tritan copolyester in simple terms?

Why does Tritan copolyester matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Tritan copolyester?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Tritan copolyester.