Polymer Dictionary

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	LLDPE Linear low density polyethylene Based on the same technology as HDPE, but the density is reduced through the incorporation of longer a-olefins as comonomers. With this, another way of adapting the products to the final applications turns up. Single-site catalysts allow an expansion of the application range, mainly by allowing higher comonomer contents and a more even distribution of these.
	LDPE (Low density polyethylene) A product from a high-pressure polymerisation process, LDPE is characterised by its highly branched chain structure. As a result of this, density and crystallinity are reduced while the processability in a variety of conversion technologies is greatly facilitated. The addition of special comonomers can further expand the property range of these grades.
	Low pressure polyethylene (LPPE) The collective name given to polyethylene produced in low pressure processes. The polymerisation is utilising a catalyst to get the neccessary rate of polymerisation. Homopolymer and copolymers of ethylene are made by these processes.
	Long chain branch A brach with many (>20) carbon atoms. Typical for low density PE.
	Loop reactor A bulk (slurry) polymerisation reactor which is made of a closed long tube through which the slurry is circulated. Loop reactors are characterised by a very narrow residence time distribution, leading to uniform product characteristics.