Pressure-sensitive adhesive featuring low outgassing
AssigneeTesa SE
InventorsMarc Husemann, Stephan Zollner
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Abstract
A pressure-sensitive adhesive composition based on (co)polymers of acrylic acid and/or methacrylic acid and/or derivatives thereof which has an at least two-phase domain structure and also an outgassing level of less than 10 μg/g, based on the weight of the composition, when measured by the tesa method.
Claims12
A pressure-sensitive adhesive composition based on (co)polymers of acrylic acid and/or methacrylic acid and/or derivatives thereof which has an at least two-phase domain structure and also an outgassing level of less than 10 μg/g, based on the weight of the composition, when measured by the tesa method.
A process for preparing a pressure-sensitive adhesive composition as claimed in at least one of the preceding claims, using a polyacrylate solution obtainable by free-radical polymerization, which comprises
- a concentration process in which
- following polymerization, an entrainer is added to the polyacrylate solution,
- the polyacrylate solution with the added entrainer is passed into an extruder in which the polyacrylate solution is subjected to a carrier distillation,
- as a result of the concentration a polyacrylate composition of a kind is produced which is processed further from the melt
- and the concentrated polyacrylate composition, where appropriate, is applied to a backing material.
Dependencies are inferred from the claim text.