US 12,415,905 B2
Flame-retardant thermoplastic polyurethane
Oliver Steffen Henze, Lemfoerde (DE); Oliver Muehren, Lemfoerde (DE); Birte Nitz, Lemfoerde (DE); Tanja Lange, Lemfoerde (DE); Sabine Moeller, Lemfoerde (DE); and Alfons Bertels, Lemfoerde (DE)
Assigned to BASF SE, Ludwigshafen am Rhein (DE)
Appl. No. 17/255,656
Filed by BASF SE, Ludwigshafen am Rhein (DE)
PCT Filed Jun. 24, 2019, PCT No. PCT/EP2019/066618
§ 371(c)(1), (2) Date Dec. 23, 2020,
PCT Pub. No. WO2020/002200, PCT Pub. Date Jan. 2, 2020.
Claims priority of application No. 18179577 (EP), filed on Jun. 25, 2018.
Prior Publication US 2021/0189100 A1, Jun. 24, 2021
Int. Cl. C08K 5/53 (2006.01); C08G 18/32 (2006.01); C08G 18/44 (2006.01); C08G 18/48 (2006.01); C08G 18/66 (2006.01); C08G 18/75 (2006.01); C08G 18/76 (2006.01); C08K 3/22 (2006.01); C08K 3/32 (2006.01); C08K 5/00 (2006.01); C08K 5/52 (2006.01); C08K 5/5313 (2006.01); C08L 75/08 (2006.01); H01B 3/30 (2006.01); H01B 7/295 (2006.01)
CPC C08K 5/5313 (2013.01) [C08G 18/3206 (2013.01); C08G 18/44 (2013.01); C08G 18/4854 (2013.01); C08G 18/664 (2013.01); C08G 18/6674 (2013.01); C08G 18/758 (2013.01); C08G 18/7671 (2013.01); C08K 3/22 (2013.01); C08K 3/32 (2013.01); C08K 5/0066 (2013.01); C08K 5/5205 (2013.01); C08L 75/08 (2013.01); H01B 3/302 (2013.01); H01B 7/295 (2013.01); C08K 2003/2241 (2013.01); C08K 2201/005 (2013.01); C08K 2201/019 (2013.01)] 21 Claims
 
1. A composition, comprising:
(i) a thermoplastic polyurethane, wherein polyether diols or polycarbonate diols are used to produce the thermoplastic polyurethane,
(ii) a melamine polyphosphate as a first phosphorus-containing flame retardant (F1) in an amount of from 5% to 20% by weight based on a total composition,
(iii) a phosphinic acid derivative as a second phosphorus-containing flame retardant (F2) in an amount of from 10% to 35% by weight based on the total composition, and
(iv) a third phosphorus-containing flame retardant, which is a liquid phosphoric ester at 21° C., in an amount of from 2% to 10% by weight based on the total composition,
wherein the third phosphorus-containing flame retardant is selected from the group consisting of 1,3-phenylene bis(diphenyl)phosphate; 1,3-phenylene bis(dixylenyl)phosphate; resorcinol bis(diphenyl phosphate) (RDP); bisphenol A bis(diphenyl phosphate) (BDP); and diphenyl cresyl phosphate (DPC);
wherein the composition is free from melamine cyanurate, and
wherein the phosphorus-containing flame retardants in the composition consist of those selected from (i), (iii), and (iv).