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BMS at ASC 2013 Spring Convention: Presented PUR Dispersions for Adhesive Applications

Published on 2013-04-24. Author : SpecialChem

Atlanta -- While polyurethane dispersions (PUDs) can be used to formulate both coatings and adhesives, they present some distinct advantages for adhesives. Adhesives formulated with PUDs are well suited to applications in a number of different markets - from footwear to automotive.

Polyurethane dispersions provide adhesive manufacturers with a variety of formulating options. These adhesive raw materials are available with a range of film properties - from hard to soft. The appropriate dispersion used depends on the end-use application.

Dr. Jeffrey Dormish, senior principle scientist, Bayer MaterialScience LLC, provided an overview of this technology in his presentation "Polyurethane Dispersions for Adhesive Applications".

Dr. Dormish explained that overall, PUDs provide a number of performance advantages over other formulations, including:
  • Easy processing via spray, roller, etc.
  • Good adhesion to difficult-to-bond substrates
  • High initial bond strength
  • Resistance to moisture and plasticizers
  • Excellent PVC adhesion
  • Low activation temperature for crystalline adhesives
  • Ability to blend with other dispersions to optimize cost/performance

These desired properties lend themselves to a variety of end uses, such as footwear, sports equipment, credit card, furniture and automotive applications.

According to Dr. Dormish, the addition of waterborne polymers to adhesives provides the additional benefit of being a more environmentally friendly formulation, as no solvents are used.

"The increased use and adoption of waterborne polymers in the adhesives industry represent the continued advancement of polyurethane chemistry," said Dr. Dormish. Adhesives based on waterborne polymers can be used for a wide range of end-use applications, including furniture, automotive, flexible packaging and shoe adhesives.

Depending on the formulation, adhesives are grouped into three technologies - those that require heat activation, others suitable for wet bonding, and still others that exhibit cold tack. Some adhesives, often used in furniture and shoe applications, require heat to activate films that are not tacky at room temperature. Conversely, cold tack adhesives are tacky at room temperature once the water evaporates. This application condition works well for automotive and flexible packaging uses. Finally, porous surfaces, such as textiles, are typically joined using wet-bonding adhesives.

About Bayer MaterialScience LLC

Bayer MaterialScience LLC is one of the leading producers of high-performance plastics in North America and is part of the global Bayer MaterialScience business with approximately 14,500 employees at 30 production sites around the world and 2012 sales of 11.5 billion euros. The company manufactures high-tech polymer materials and develops innovative solutions for products used in many areas of daily life. The main segments served are the automotive, electrical and electronics, construction, medical, and sports and leisure industries. Sustainability is central to Bayer MaterialScience LLC's business and is based around the key areas of innovation, product stewardship, social responsibility and respect for the environment.

Forward-looking statements

This website may contain forward-looking statements based on current assumptions and forecasts made by Bayer Group or subgroup management. Various known and unknown risks, uncertainties and other factors could lead to material differences between the actual future results, financial situation, development or performance of the company and the estimates given here. The company assumes no liability whatsoever to update these forward-looking statements or to conform them to future events or developments.

Source: Bayer MaterialScience


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