Polymer Additives

POLYSORB® based epoxy coating

BPA-based epoxy coating

have compelling properties for innovative packaging, both recyclable and reusable.

Semi-crystalline PEIT (PEITsc)

Semi-crystalline polymers have an ordered structure and sharp melting point. Prized for their ability to produce tough finished components with excellent strength and stiffness they can be difficult to thermoform. The higher Tg of PEIT, relative to PET, is particularly advantageous for aerosol packaging. Plastic aerosols are lightweight, chemically resistant, low cost and safer to store than metal alternatives. Unlike PET, PEITsc has the thermal resistance required to meet the criteria laid out in European Aerosols Federation (FEA) Standard 647.2 It therefore answers directly to the trend away from metal towards plastic aerosol packaging. The enhanced thermal properties of PEITsc are equally advantageous when it comes to beverage packaging, for hot filling and pasteurization. With hot filling, vegetable and fruit juices, water, teas and other soft drinks, are heated and and filled at high temperature to ensure sterilization of the bottle and closure system; pasteurization is an alternative preservation technique for drinks such as beer. PEITsc eliminates any requirement for a vacuum panel, increasing design flexibility. PEITsc beer bottles have proven resistance to deformation during pasteurization at 60°C for 15 minutes. Beyond thermal properties, PEITsc has excellent chemical resistance making it a strong contender for personal care and cosmetic packaging, particularly for products containing polar molecules (e.g. nail polish remover, shaving cream and make-up remover). Incorporating isosorbide produces chemically inert, high gloss packaging with good optical properties and excellent impact resistance. This is a compelling packaging profile for high value products. All these performance benefits are accessible with no loss of recyclability

POLYSORB® based epoxy BPA-based epoxy

relative to PET. PEITsc can be recycled directly into existing PET waste streams with recycled materials containing up to 50% modified PET fulfilling all the European PET Bottle Platform (EPBP) Testing Protocols for assessing PET recycling compatibility.3 PEITsc can also carry the Resin Identification Code (RIC) #1.4

Amorphous PEIT (PEITam) 0

Very good adhesion

1 2 3 4

Very poor adhesion

Figure 4. Isosorbide-based epoxys exhibit superior deformation and adhesion characteristics relative to bisphenol A analogues.

new, sustainable feedstocks and high-performance materials. Step forward isosorbide: it is perfectly safe and is produced from an annually renewable feedstock. Isosorbide has a number of potential uses in packaging applications.

Packaging applications for isosorbide: PET

PET is a copolyester of ethylene glycol and terephthalic acid, both of which are essentially petrochemical feedstocks. Replacing some of the ethylene glycol with isosorbide results in the compound polyethylene co-isosorbide terephthalate (PEIT). A defining feature of this material is an elevated Tg. Depending on the extent of isosorbide replacement, PEIT is either semi-crystalline or amorphous and both types of polymer


When it comes to reusable plastic packaging, PEITam is more environmentally friendly than PET, but with no loss of performance. For example, PEITam reusuable sports bottles have excellent scratch and fingerprint resistance while reusable food containers are dishwasher proof and offer better staining resistance relative to PET. Safety and the assurance of a non-endocrine disruptor monomer are highly advantageous for these applications.

In summary

Isosorbide is a plant-based, sustainable monomer with a low carbon footprint and significant potential for a wide range of applications. Substituting isosorbide for existing petrochemical ingredients not only lightens the environmental impact of industrial polymers, but also improves performance enabling the manufacture of new types of aerosol packaging, touch screens with enhanced clarity and scratch resistance, and better adhesives with improved UV and impact resistance. These are just some of the products that isosorbide is already beginning to deliver as polymer chemists and formulators learn what it can do.

For more information on high-purity POLYSORB® isosorbide from Roquette visit performance-materials/composites-and-coatings

March/April 2021 • Issue 2

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