Visit the NSK UK web site

Polymer modifier improves impact resistance of PBT

A DuPont (UK) product story
Edited by the Engineeringtalk editorial team Sep 28, 2005

Polybutylene terephthalate resins modified with a new Du Pont toughening agent deliver sharp increases in impact resistance, while key engineering and processing properties remain largely intact.

Polybutylene terephthalate (PBT) resins modified with a new Du Pont toughening agent deliver sharp increases in impact resistance, while key engineering and processing properties remain largely intact.

The new toughener, Du Pont Elvaloy PT862 polymer modifier, is part of a broad range of property-enhancing additives supplied under the Du Pont Elvaloy and Fusabond brands.

Test data show that PBT compounds containing Elvaloy PT862 retain more of their original stiffness, strength, heat deflection temperature values; demonstrate high elongation; and flow more easily during moulding than compounds prepared with alternative tougheners, including conventional modifiers containing glycidyl methacrylate (GMA) terpolymer.

"Elvaloy PT862 gives compounders a valuable tool for tailoring the properties of PBT resins to application requirements", said Dr Penny Perry Director, Du Pont Industrial Polymers.

Typical applications for toughened PBT include electrical and electronic components, such as connectors, as well as components for various other industrial and consumer products.

When a typical unreinforced PBT is compounded with 15% of the new toughener, its notched Izod impact strength rises to 10 to 12 times that of the unmodified polymer at temperatures between 0C and 23C.

In a 30% glass-reinforced resin with 10% modifier, notched Izod is more than doubled at 23C and more than quadrupled at -20C.

Significant impact improvement is also achieved at 5 to 10% use levels.

A typical unreinforced PBT with 15% of Elvaloy PT862 retains more than 80% of its original tensile strength and flexural modulus (stiffness).

A 30% glass-reinforced resin with 10% of the toughener retains nearly 90% of its tensile strength and over 75% of its original flexural modulus values.

These properties are superior to those of PBT formulated with conventional GMA-containing modifiers.

The heat deflection temperature (HDT) of the 30% glass-reinforced PBT resin with 10% Elvaloy PT862 is 201C (at 1.8MPa loading), just 2C lower than that of the unmodified resin.

In the injection moulding process, PBT modified with Elvaloy PT862 exhibits better melt flow than PBT compounds prepared with conventional GMA-containing modifier.

In moulding parts, such as connectors with thin wall sections and/or long flow paths, the excellent flow of PBT toughened with the new modifier improves productivity by widening the process window and reducing clamping pressure requirements.

Other PBT-compatible grades of Elvaloy allow compounders to achieve property combinations different from those achieved with the new Elvaloy PT862.

Super-tough PBT grades, for example, can be produced with Elvaloy PTW.

Send to a friend Send to a friend
Print this page Print this page
Bookmark this page Bookmark this page

Not what you're looking for? Search the site.

Back to top Back to top

Google Ads

 

Contact DuPont (UK)

Contact DuPont (UK)

Company profile and news

Related Stories

Contact DuPont (UK)

 

Newsletter sign up

Request your free weekly copy of the Engineeringtalk email newsletter ...

Sign up now Sign up now

Visit the NSK UK web site

Browse by category

All suppliers A - Z

A Pro-talk Publication

A Pro-talk publication