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Treatment of Organic Polymers to Enhance Adhesion and Grafting

IP.com Disclosure Number: IPCOM000077110D
Original Publication Date: 1972-Jun-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Kitze, PT: AUTHOR

Abstract

Difficulty may exist in obtaining adherent coatings on surfaces of organic polymers due to the presence of stable peroxides or peroxide induced cross-linkages. Peroxides are often present at polymer surfaces due, for example, to air oxidation following high-temperature extrusion, high-energy irradiation in air, or exposure to electrical discharge, including corona discharge. In the latter instance, the discharge causing peroxide formation may be either in air or with subsequent exposure to air.

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Treatment of Organic Polymers to Enhance Adhesion and Grafting

Difficulty may exist in obtaining adherent coatings on surfaces of organic polymers due to the presence of stable peroxides or peroxide induced cross- linkages. Peroxides are often present at polymer surfaces due, for example, to air oxidation following high-temperature extrusion, high-energy irradiation in air, or exposure to electrical discharge, including corona discharge. In the latter instance, the discharge causing peroxide formation may be either in air or with subsequent exposure to air.

Surface peroxides cause cross-linking at the surfaces of polymers by acting as ties between polymer chains. They also provide polar character to the surfaces. In same instances, this Polarization effect contributes to improved adhesion of coatings. Furthermore, surface peroxides can react with coated adhesives to improve chemical bonding at the interface. However, stable polymer cross-linkages at the surface may detract from adhesion by slowing diffusion across the interface between the surface and the adhesive.

Adhesion of coatings is increased by decreasing surface cross-linking or by causing peroxide groups to become involved in reactions. To accomplish this, the relatively stable peroxides are contacted with peroxide-decomposing materials. Particularly effective in this roll are tertiary amines, such as dimethyl aniline or triethylene diamine.

Graft polymers are formed by reacting monomers at the surfaces...