Amorphous polyalphaolefins
Amorphous polyalphaolefins (APAO, including atactic polyalphaolefins ) are prepared by polymerization of α-olefins such as 1-butene z with. B. Ziegler catalysts produced. In contrast to other polyolefins (e.g. isotactic polypropylene , i PP), these polymers are completely amorphous because they cannot crystallize. They are used for the production of hot melt adhesives ( hot melts ) and pressure sensitive hot melt adhesives . The main monomer for these applications is propylene . The α-olefins used can be obtained, for example, using the SHO process .
APAOs have good adhesive properties on non-polar surfaces and are resistant to high and low temperatures and the influence of moisture. Typical molecular weights of APAOs are between 10 and 20,000 g / mol.
The main areas of application of the APAO are as a hot melt adhesive in the packaging industry, in the hygiene industry, for example as an adhesive for diapers and in the woodworking industry.
Individual evidence
- ↑ New VESTOPLAST production facility enables Degussa to add additional APAO capacities at short notice . www.chemie.de. Retrieved December 9, 2009.
- ^ Antonio Pizzi, Kashmiri L. Mittal: Handbook of Adhesive Technology . 2nd Edition. CRC Press, 2003, ISBN 978-0-203-91222-5 , pp. 923 ( limited preview in Google Book search).
- ↑ Bodo Müller, Walter Rath: Formulation of adhesives and sealants: the competent textbook for study and practice . Vincentz Network, Hannover 2004, p. 98 ( limited preview in Google Book search).
- ↑ TER HELL & CO. GMBH: Amorphous polyalphaolefins APAO for hot melt adhesives: TER HELL & CO. GMBH: Amorphous polyalphaolefins APAO for hot melt adhesives , accessed on November 11, 2018
Web links
- Information on and formulations with APAOs ( Memento from May 17, 2017 in the Internet Archive ) at Eastman