Dow Global Technolgoies LLC

Bernard A Fehr

David G McLeod

Mark B Jeruzal

Otto J Berbee

Cornelis F J Den Doelder

Stefan Hinrichs

Carmelo Declet Perez

Eva-Maria Kupsch

Rajesh P Paradkar

Martinus A Aarts

Martinus W Aarts

Cornelis FJ Den Doelder

A process for producing an ethylene-based polymer comprises polymerizing, by the presence of at least one free-radical initiator and using a high pressure tubular polymerization process, a reaction mixture containing ethylene and at least one CTA system comprising one or more CTA components to produce the ethylene-based polymer. The free-radical initiator is dissolved in a solvent comprising a saturated hydrocarbon to form an initiator solution which is added to the polymerization using an initiator feed line to an initiator injection pump. At least 50 wt % of the solvent has i) a dry point of less than or equal to 160&#xb0; C. and ii) an initial boiling point of greater than or equal to 100&#xb0; C. The polymerization process has a ratio of inlet pressure to first peak temperature of less than or equal to 9 Bar/&#xb0; C. At least one CTA make-up stream is fed into the polymerization process, wherein less than or equal to 30 wt % of the at least one CTA make-up stream comprises one or more saturated hydrocarbon CTA(s) with a maximum carbon atom number of 6 per molecule.

Methods for producing low volatile tubular low density ethylene-based polymers for clean extrusion coating processing

Reinforced composite pipes and methods for making the same, generally employ at least one polymeric reinforcement phase, typically provided as an intermediate form. The intermediate form is typically applied over a core pipe, and may be consolidated. An optional jacket may be employed.

Composite pipes and method making same

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Bad Ragaz, Switzerland

Bernard A Fehr