US 12,215,183 B2
Expanded thermoplastic polyurethane beads, production thereof and production of a molded part
Peter Gutmann, Ludwigshafen (DE); Elmar Poeselt, Lemfoerde (DE); Hye Jin Park, Lemfoerde (DE); Uwe Keppeler, Ludwigshafen (DE); and Lutz-Peter Hoenemann, Lemfoerde (DE)
Assigned to BASF SE, Ludwigshafen am Rhein (DE)
Appl. No. 16/349,339
Filed by BASF SE, Ludwigshafen am Rhein (DE)
PCT Filed Nov. 13, 2017, PCT No. PCT/EP2017/079049
§ 371(c)(1), (2) Date May 13, 2019,
PCT Pub. No. WO2018/087362, PCT Pub. Date May 17, 2018.
Claims priority of application No. 16198709 (EP), filed on Nov. 14, 2016.
Prior Publication US 2019/0345284 A1, Nov. 14, 2019
Int. Cl. C08G 18/48 (2006.01); B29C 48/05 (2019.01); B29C 48/345 (2019.01); B29C 48/37 (2019.01); B29C 48/92 (2019.01); C08G 18/12 (2006.01); C08G 18/66 (2006.01); C08G 18/76 (2006.01); C08G 18/80 (2006.01); C08J 9/18 (2006.01); C08K 3/36 (2006.01); C08L 75/06 (2006.01); C08L 75/08 (2006.01); B29C 48/00 (2019.01); B29C 48/04 (2019.01)
CPC C08G 18/4854 (2013.01) [B29C 48/05 (2019.02); B29C 48/345 (2019.02); B29C 48/37 (2019.02); B29C 48/92 (2019.02); C08G 18/12 (2013.01); C08G 18/6674 (2013.01); C08G 18/7657 (2013.01); C08G 18/8012 (2013.01); C08J 9/18 (2013.01); C08K 3/36 (2013.01); C08L 75/06 (2013.01); C08L 75/08 (2013.01); B29C 48/0022 (2019.02); B29C 48/04 (2019.02); C08G 2110/0058 (2021.01)] 14 Claims
 
1. Expanded thermoplastic polyurethane beads polymerized from an isocyanate, an isocyanate-reactive compound having a molecular weight between 500 and 10 000 g/mol and a chain extender,
wherein:
customary adjuvants may be additionally present;
the thermoplastic polyurethane has a hard phase fraction in the range from 0.15 to 0.5 and the hard phase fraction is defined by:

OG Complex Work Unit Math
wherein:
MKVx: molar mass of chain extender x in g/mol,
mKVx: mass of chain extender x in g,
MIso: molar mass of isocyanate in g/mol
Mges: total mass of all starting materials without adjuvants
k: number of chain extenders;
wherein said chain extender is selected from the group consisting of
1,6 hexanediol,
1,6-hexanediol and 1,4-butanediol, and
1,4-butanediol and 1,3-propanediol,
excluding 1,4-butanediol alone; and
said thermoplastic polyurethane has a melting temperature below 120° C.