Barrier coating resins from Covestro help us create a better environment

It’s time to switch to more reusable packaging

The fast pace of modern life has made food and beverage packaging essential for all of us, from that take-out coffee in the morning to the sandwich we buy for lunch, and maybe our evening meal too.

We consume so much packaging material that it has become a considerable part of the overall packaging industry.

Sadly, most food packaging still uses unsustainable materials such as composites of extrusion polymers like LDPE.

Materials such as LDPE do a good job at protecting the food inside the package while keeping essential functions like oil/ grease resistance and moisture resistance.

But they are difficult to recycle economically. So most PE-extruded packaging ends up going to land fill, where it can take 500 -1000 years to degrade. Just think how harmful that is to the long-term health of our planet.

Curious on what we can do to make packaging more recyclable?

Our insights report gives you the facts you need to know.

 

Do you know your resins from your dispersions?

Learn more about the processes and terms used in creating our barrier coatings.

 

Kinder to the environment with the performance you need

At Covestro, our mission is to create products that will enable safe and sustainable food and beverage packaging for many years to come.

Our portfolio of barrier resins offer a recycle able alternative to LDPE coatings. Our multi-functional resins are easy to formulate and are resistant to water (WVTR & COBB*), grease, oil and moisture. Also, they are easy to re-pulp, with almost all the fibre being recovered.

Covestro offers a fast and easy transition from PE laminated stock, and with no loss in performance whatsoever, that can be used on existing machinery.

Testing for sustainable success

Find out why our rigorous testing procedures ensure our barrier coating resins ­­are delivering high-quality products. Learn more about how we do this.

What these terms mean and how they are measured

Water Barrier (MVTR / COBB)

Effective protection, especially important in the creation of beverage packaging

Water absorption and Humidity

The amount of water the surface of the material can take up in a certain time is measured by the Cobb test.

A sample of water is placed on the top of a beaker containing water. Then the beaker is flipped so the water comes in contact with the material. At specific time intervals, the sample’s weight is determined.

Results from the Cobb test show that board (especially boxboard made from recycled fiber) is extremely sensitive to atmospheric humidity and must be stored at a maximum of 50% relative humidity, which often means using air-conditioned warehouses. This is because water-damaged board will bend and become unsuitable for printing or box manufacture.

All our MVTR / WVTR tests are conducted using MOCON technology which delivers extremely accurate results by combining precision temperature and humidity control with highly-sensitive sensors.

WVTR / MVTR

Water vapor transmission rate (WVTR) tells us how much moisture is able to pass from a material’s interior surface to the outside.

This is determined at specified conditions of temperature and relative humidity, and expressed as grams per square meter per day: g/m2 /24hr (ASTM F 1249 at 38°C and 90% RH, BS 3177 at 25°C and 75% RH, DIN 53122 at 23°C and 85% RH).

Cobb Testing

Measuring water absorption

Cobb Sizing Tester determines the amount of water absorbed by paper, cardboard, corrugated fiberboard, paperboard, in a specified time under standardized conditions. The levels of water absorption help evaluate various characteristics of paper (such as sizing, porosity, etc.).

Reworkability

Reworkability is a combination of recyclability and repulpability

Recyclability

This refers to the capability of used paper, including in-plant and post-consumer waste paper and paperboard, to be processed into new paper or paperboard.

Repulpability

This refers to the capability of material to be re-wetted and fiberized to form new sheets.

Heat Seal

The parameters used in creating an effective heat seal

Seal limit

Is the minimum temperature needed for a proper seal at given times and pressures. This is normally expressed in °C and may refer to the machinery used to carry out this test e.g. Otto Brugger.

Seal window

Is the maximum and minimum temperatures between which proper seals can be formed on packaging, expressed as a range of °C. Optimal seal windows often refer to the running speed of the film on production line. This range normally becomes narrower – and seal temperatures higher – as line speed increases. You may see seal windows described in terms of branded machinery.

Seal strength

Is the maximum force needed to tear a specified width of a seal. It is expressed as force per width e.g. N/25mm.

Grease/Oil Retention & Contamination Prevention

Retaining grease and oil while preventing contamination of the product

Any grease leakage will eventually cause dark spots on the outer layer of the paper or board. However, grease resistance can be improved by the degree of grinding of the fibers and coatings used.

There are several tests that will determine the grease resistance of board. One of these is the Kit test. In this test, a drop of fluid is put on the side of the board. The composition of the fluid corresponds to a certain Kit value. This means that the time it takes for spots to appear on the board can be measured, and subsequently correlated into a measurement of a material’s grease resistance.

Kit test data and results are available for all resins.

Low Odor

Correctly balancing the odor of a food is essential, especially in terms of customer satisfaction

Foods with a poor odor experience can represent an economic and health challenge to the manufacturer.

With our resins, we have reduced the residual monomer levels to the lowest point possible to make any odors present in packaging as neutral possible.

This means the end consumer can enjoy the food or beverage experience as the manufacturer intended.

Covestro resins are more than a match for LDPE

In tests and live in the field, products created using Covestro resins have shown to be equally as effective as those made with traditional, less eco-friendly materials. Our stringent testing procedures ensure that all our products offer a high level of performance.

Water Barrier 

Heat Resistence 

Reworkability

Heat Seal

Grease / Oil 

Low Odor 

NeoCryl® A-2092

NeoCryl® A-2092 is a modified acrylic styrene copolymer dispersion for use in overprint varnish and water based liquid inks. The product combines a good balance in water, fat and grease resistance with excellent printability and transparency. The product can be used in specific applications where food contact compliance is required.

NeoCryl® A-2095

NeoCryl® A-2095 is a modified acrylic styrene copolymer dispersion for use in overprint varnish and water based liquid inks, as well as a let-down resin for water based flexo - and gravure inks onto polyolefin films. The product combines a good balance in water, fat and grease resistance with excellent printability, transparency and a low odor. The product can be used in specific applications where food contact compliance is required.

NeoCryl® BT-62

NeoCryl® BT-62 is a semi-colloidal acrylic styrene copolymer dispersion for use in low Cobb value inks and paper coatings.