	US 11,970,594 B2
	Enhancement of long-term properties of closed-cell rigid polyurethane foams
Maximilian Lehenmeier, Ludwigshafen (DE); Hendrik Wagner, Lemfoerde (DE); Rainer Klenz, Ludwigshafen (DE); and Heike Hoelscher, Lemfoerde (DE)
Assigned to BASF SE, Ludwigshafen am Rhein (DE)
Appl. No. 17/753,891
Filed by BASF SE, Ludwigshafen am Rhein (DE)
PCT Filed Sep. 17, 2020, PCT No. PCT/EP2020/076000 § 371(c)(1), (2) Date Mar. 17, 2022, PCT Pub. No. WO2021/053081, PCT Pub. Date Mar. 25, 2021.
Claims priority of application No. 19198304 (EP), filed on Sep. 19, 2019.
Prior Publication US 2023/0002582 A1, Jan. 5, 2023
Int. Cl. C08J 9/36 (2006.01)

CPC C08J 9/365 (2013.01) [C08J 2205/052 (2013.01); C08J 2205/10 (2013.01); C08J 2375/04 (2013.01); C08J 2467/02 (2013.01)]

17 Claims

1. A thermal insulation element, comprising:

a closed-cell rigid polyurethane foam, which is at least partially covered by a layer system comprising at least one layer formed by a polybutylene terephthalate composition.