A novel emulsion polymer has been developed for use in protective coatings for steel. The latex polymer, which is described as a chlorinated vinyl acrylic, is made from the emulsion polymerization of vinylidene chloride, vinyl chloride and acrylates. The polymer film has low water vapor and oxygen permeability, is tough, flexible and nonflammable. Air-drying waterborne primers for steel have been successfully formulated with this chlorinated vinyl acrylic latex to overcome deficiencies associated with many other waterborne primers. For best results a nonionic surfactant is required in the formulation and the primers must be acidic. The primers have good flexibility and impact resistance, good adhesion to steel, good intercoat adhesion with various topcoats, will not cause flash rusting and have shown to give good protection to steel in laboratory and natural exposure tests. Steel structures at various locations around the world have been painted with these primers over the last three or more years.

Subject
Intercoat adhesion, Films, Primers, Water, Coatings, Vinyls, Monomers, Latex, Polymers, Steel, Corrosion protection, Chlorides, Acrylics
© 1985 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1985
Association for Materials Protection and Performance (AMPP)
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