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Environmentally Aware Printing – Types of Adhesives (continued) – 9th March 2010
C) Water-dispersible hot melt polymers

A wealth of literature exists describing supposedly water-dispersible or soluble polymers which can be used as adhesive bases for a range of market applications. Polymers such as functionalised polyesters, acrylic acid homopolymers/ copolymers, vinyl methyl ethers, maleic anhydride/ acids, polyvinyl alcohols and vinyl-pyrolidone copolymers are among those investigated, but such polymers from inherent problems which are usually related to the thermal and oxidative stability of the product during manufacture/ application and/ or the water sensitivity/ humidity resistance of the glue film when applied. Obviously, poor humidity resistance could give rise to a rapidly degradable spine if used in a bookbinding application.

To overcome these problems, patented technology has emerged where hot melt adhesives are based on a unique class of graft copolymers of various vinyl monomers. These products can be considered as dispersible in the mill system under shear; pH and temperature but remain stable to moisture at ambient temperatures.

Rather than forming tacky agglomerates and therefore stickies, the finely divided particles of the vinyl graft copolymer-based hot melt may then become incorporated into the reclaimed paper without any adverse effects.

To be continued…

Peter Harrison is Joint Managing Director of The Printing House Ltd, and Print Buying Direct of Crewe, Cheshire, UK.

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• Environmentally Aware Printing – Types of Adhesives – part 3
• Environmentally Aware Printing – Types of adhesives – part 2
• Environmentally Aware Printing – Types of adhesives – part 1
• Environmentally Aware Printing – Dealing with the stickies problem Part 4
• Environmentally Aware Printing – Dealing with the stickies problem Part 3

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