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Contract n° BOS-122-I

Easily Removable Hot-Melt Adhesives for Use in Repulpable Paper Products and Related Process
  • M. Pieroni
  • A. Chiolle
  • P. Tredici
  • V. Koch
  • G. Calmanti
  • A. Gatti

Summary

Stikies formation in paper recycling is due in great part to hot melt and pressure sensitive adhesives. In Europe EVA copolymers are widely used for their preparation. A new class of hot melt adhesives (HM) for paper binding has been found, which is characterized by a low stickies forming capabilities and an easy removability in the recycling process. These HM belong to the class of saturated copolyesters and are prepared starting from terephtalic and adipic acid esters with 1,4-butandiole or monoethyleneglycole. Among the new HM formulated with saturated copolyesters (COPES) the best set of properties, both for application in book binding and for paper recycling, has been obtained by using a copolymer prepared from monoethylenglycole blended with minor amounts of two elastomeric copolyesters, colophony resin derivatives and antioxidants. Removal from secondary fiber pulp is easily carried out by using hydrocyclones owing to the low stickiness of HM particles and to their density of about 1.2 g/cm3. A new evaluation method, developed in the research, has shown a much lower tendency to form stickies by reagglomeration in COPES HM than in EVA HM. Higher prices of the new adhesives can be counterbalanced by lower recycling operating costs and lower lost production.

Keywords

Softening Point Fiber Pulp Waste Paper Paper Recycling Pressure Sensitive Adhesive 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ECSC, EEC, EAEC, Brussels and Luxembourg 1987

Authors and Affiliations

  • M. Pieroni
    • 1
  • A. Chiolle
    • 2
  • P. Tredici
    • 3
  • V. Koch
    • 4
  • G. Calmanti
    • 5
  • A. Gatti
    • 5
  1. 1.Istituto G. DoneganiItaly
  2. 2.Dutral SpAItaly
  3. 3.Bassi Marchini SpAItaly
  4. 4.Siva SpAItaly
  5. 5.Montefluos SpAItaly

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