Exxonmobil Chemical Patents Inc.

Anna C Claerbout

Stefan B Ohlsson

Paul Jan Clymans

Peter William Manders

Linda Maria Van Den Bossche

Willy J J Leysen

Rajesh Puthenkovilakom Raja

Jeffrey D Daily

Amit Kumar Ghosh

A process for producing an ethylene copolymer, the process including: (a) contacting ethylene with at least one polar comonomer in the presence of at least one modifier and at least one free radical initiator in a tubular reactor under polymerization conditions including a pressure of from 225 to 270 MPa; (b) injecting the at least one free radical initiator into the reactor at a plurality of reaction zones spaced along the length of the reactor, wherein each reaction zone comprises an inlet and an outlet; (c) maintaining the temperature at the inlet of each reaction zone at 150&#xb0; C. or less, and the temperature at the outlet of each reaction zone is at least 177&#xb0; C.; (d) controlling the modifier flow at a rate of from 0.02 to 0.986 wt % of the copolymer; and (e) recovering the ethylene copolymer from the tubular reactor, is provided.

Process for producing ethylene copolymers

Methods and systems for making a film made of dynamically vulcanized thermoplastic elastomeric material are provided herein. The subject methods and systems achieve dimensional stability of an elastic film by applying thermal treatment as part of the film making process and enhance the shrinkage of the film by intentionally with stretching the film while hot and freezing the film in the stretch. The systems and methods are useful in controlling shrinkage of DVA post film extrusion.

Methods of making a film of dynamically vulcanized thermoplastic elastomeric materials

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Flanders, Belgium

Anna C Claerbout