E.i. Dupont De Nemours and Company

Fritz P Boettcher

Richard C Ebersole

Walter R Hertler

Michael Robert Samuels

Ira B Dicker

Rudolph John Angelo

Richard Nelson Blomberg

Richard Masayoshi Ikeda

Group Transfer Polymerization (GTP) process for preparing a 'living' polymer, the process comprising contacting under polymerizing conditions in a polymerization medium, at least one acrylic or maleimide monomer with an initiator which is a tetracoordinate organosilicon, organotin or organogermanium compound having at least one GTP initiating site and a catalyst which is or is a source of an anion selected from the group consisting of bifluoride, fluoride, cyanide, azide or a selected oxyanion, or a selected Lewis acid or Lewis base, the process further characterized in that the initiator or the anion or Lewis acid catalyst is chemically attached (grafted) to a solid support that is insoluble in the polymerization medium.

Group transfer living polymer grafted to an initiator support

Group Transfer Polymerization process employing supported initiators

Films, sheets or foils are given a gas-barrier coating of an aromatic polyamide, polyimide, polyamide-imide, polyhydrazide, polyamide-hydrazide, or polyazomethine by direct vapor-phase condensation polymerization of their respective monomers. The monomers are introduced in an inert diluent gas, mixed and reacted in the presence of the surface to be coated. The surface is maintained above the critical minimum deposition temperature of the monomers but below about 300.degree. C. The coating is formed to a thickness between about 0.1 and 0.6 mil.

Gas-barrier coated films, sheets or foils and method of preparation

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Newark, DE, United States of America

Fritz P Boettcher