Process for producing a rubber-based double-sided pressure-sensitive adhesive tape

US6527899B1 · kind B1 · utility

Assignee

• tesa AG · DE

Inventors

• Bernd Dietz · Herzogenaurach, DE
• Werner Kluge-Paletta · Kürten, DE
• Werner Karmann · Hamburg, DE
• Bodo Szonn · Kisdorf, DE
• Frank Henke · Neu Wulmstorf, DE

Key dates

• Filing date: Apr 21, 1998
• Grant date: Mar 4, 2003
• Expiry date: Jan 7, 2019

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B32B2405/00
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Process for producing a pressure-sensitive double-sided adhesive tape, in whicha) a ready-made rubber-based backing material is introduced into a screw extruder, where1. the backing material is heated by means of heating elements present on the screw extruder,2. in a degassing zone, the backing material is freed from volatile constituents by means of the application of reduced pressure,3. the backing material is homogenized and brought to the intended temperature,b) in a co-extrusion adapter, a barrier layer conveyed by means of a further appropriate melting and conveying unit is placed onto the backing material on both sides,c) the resulting intermediate laminate is supplied to a three-channel slot die and is uniformly extruded in web form,d) in the said three-channel slot die a pressure-sensitive hotmelt adhesive, supplied in each case with the aid of an appropriate melting and conveying unit, is applied, top and bottom, over the whole area of the intermediate laminate,e) the adhesive tape thus produced is placed onto an antiadhesive substrate, preferably siliconized paper,f) if desired, the adhesive tape is cooled and crosslinked.