Polyolefins having isotactic structural elements, method for producing the same and use thereof

Abstract

The invention relates to polyolefins having isotactic structural elements, method for producing the same and use thereof, in particular relates to use as bond or bond components. The invention, especially relates to a polyolefin containing at most 20 wt% of ethene, 70 to 100 wt% of or at most 20 wt% of propylene, and / or 70 to 100 wt% of or at most 20 wt% of 1-butylene or other straight-chain 1-polyolefin, wherein total content is 100 wt%, which is characterized isotactic conten is 75 to 98 wt% of three-unit distribution measured by [13]C-NMR for the propylene three-unit, atactic content is less than 20 wt% and syndiotaxy content is at most 20%, and / or isotactic conten is 10 to 98 wt% of three-unit distribution measured by [13]C-NMR for the butylene three-unit, atactic content is 1 to 85 wt% and syndiotaxy content is at most 20%.

Description

technical field [0001] The present invention relates to polyolefins having isotactic structural units, a process for their production and their use, in particular as adhesives or as components of adhesives. Background technique [0002] The use of metallocene compounds as catalysts in olefin polymerization processes has long been known. Kaminsky et al. have demonstrated that cyclopentadienyl zirconium dichloride / methylaluminoxane (Cp 2 ZrCl 2 / MAO) catalyst system is very suitable for the polymerization reaction (Adv. Organomet. Chem. 1980, 18, 99-149). The MAO or methylaluminoxane (partial hydrolysis product of trimethylaluminum) used here acts as a cocatalyst. Since then, combinations of metallocene compounds and MAO have been widely used in polymerization processes. There are many published patents, such as US 6,121,377, EP 584 609, EP 516 018, WO 2000 / 037514, WO 2001 / 46274 and US 2004 / 0110910, which describe the metallocene-catalyzed polymerization of olefins such as...

AI Technical Summary

Problems solved by technology

High reaction temperatures (which are (sometimes very broadly) above the melting point of the polymer produced) lead to very high reaction pressures, making it difficult to run the polymerization process in an economical manner

Furthermore, over a broad interval of the specified method window (T R 40-250°C, p R 10-3,000bar), many of the monomers described in the present invention are in a supercritical state, thus needing to invest a high technical cost to control the reaction process, so that the economy of the method is further limited

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