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News

Daploy, Borealis new high melt strength polypropylenes

Borealis A/S : 03 September, 2001  (New Product)
Since its first development in the 1950s, polypropylene has rapidly become established as a preferred material in many conversion technologies (e.g. injection moulding, film and fibre) because of its excellent physical property profile. In other conversion technologies, however, this rapid utilisation was not seen. Two factors contributed to this, PP is a partially crystalline polymer and PP has low melt strength and extensibility in the melt phase. In the early days, conversion technologies such as thermoforming, blow moulding and extrusion coating were not readily able to utilise PP because of one or both of these factors.
Daploy HMS materials were specially developed to provide a solution to the second of these factors. During the manufacturing process of this new product range a patented chemical modification step incorporates long chain branching into the basic polymer backbone. This has the beneficial effect of creating a PP which has both high melt strength and extensibility. Daploy HMS materials are completely miscible with the full range standard PP materials and can be recycled. These materials not only address some of the traditional problems with PP in some conversion technologies but also open up new applications for PP. Some of the conversion techniques that can benefit from the Daploy HMS range include:

Foamed Sheet Extrusion - This is a new application in which the use of Daploy WB130HMS makes it possible to produce very low density PP foams (down to 30 kg/m) on standard foam extrusion equipment. PP foams offer important benefits over the traditional foamed polymers (e.g. polystyrene, polyethylene) such as high temperature resistance and excellent insulation properties.

Extrusion Coating - Daploy WD110HMS, when used in combination with standard grades, allows high speed direct extrusion coating with PP, with thickness down to 5 m, on a wide range of substrates (metals, carton, non-wovens etc). Daploy WD110HMS controls the neck in during extrusion and creates new opportunities for PP coated materials in packaging and hygiene applications, traditionally served by more expensive laminated structures.

Blown Film - Standard PPs are difficult to process on blown film equipment. Daploy WB120HMS is a compound, which has been specially developed to overcome processing problems such as bubble stability and wrinkling during wind up. Increased outputs and better material distribution are now possible with PP on standard equipment. This makes it possible to take advantage of the property benefits of PP in applications traditionally served by polyethylene.

Thermoforming - Daploy WB130HMS can be used as a processing aid in standard thermoforming grades. It has the benefit extending the thermoforming temperature window, particularly into the melt phase by reducing the problem of sheet sagging at the heating stage. The improved extensibility of HMS materials helps to reduce wall thickness variations in containers produced on large multi-cavity thermoforming machines.

Extrusion Blow Moulding - Daploy WB130HMS, when used in conjunction with standard blow moulding PP grades, helps reduce parison thinning and controls wall thickness distribution in containers with large blow up ratios.
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