	US 11,807,706 B2
	Thermoplastic polyurethane (TPU) foam product with high flatness, and preparation method and use thereof
Hongwei Song, Yantai (CN); Guangfu Wang, Yantai (CN); Chongchong Yang, Yantai (CN); Sheng Zhang, Yantai (CN); and Renhong Wang, Yantai (CN)
Assigned to Miracll Chemicals Co., Ltd., Yantai (CN)
Appl. No. 17/778,413
Filed by Miracll Chemicals Co., Ltd., Yantai (CN)
PCT Filed Jan. 8, 2021, PCT No. PCT/CN2021/070856 § 371(c)(1), (2) Date May 20, 2022, PCT Pub. No. WO2021/104536, PCT Pub. Date Jun. 3, 2021.
Claims priority of application No. 201911175366.1 (CN), filed on Nov. 26, 2019.
Prior Publication US 2023/0002539 A1, Jan. 5, 2023
Int. Cl. C08G 18/08 (2006.01); C08G 18/12 (2006.01); C08G 18/24 (2006.01); C08G 18/32 (2006.01); C08G 18/48 (2006.01); C08G 18/66 (2006.01); C08G 18/73 (2006.01); C08J 9/12 (2006.01); C08J 9/14 (2006.01); C08J 9/18 (2006.01); C08J 9/228 (2006.01); C08G 101/00 (2006.01)

CPC C08G 18/14 (2013.01) [C08G 18/12 (2013.01); C08G 18/244 (2013.01); C08G 18/3206 (2013.01); C08G 18/4854 (2013.01); C08G 18/6674 (2013.01); C08G 18/73 (2013.01); C08J 9/122 (2013.01); C08J 9/141 (2013.01); C08J 9/18 (2013.01); C08J 9/228 (2013.01); C08G 2101/00 (2013.01); C08G 2110/0058 (2021.01); C08G 2380/00 (2013.01); C08G 2410/00 (2013.01); C08J 2201/03 (2013.01); C08J 2201/032 (2013.01); C08J 2203/06 (2013.01); C08J 2203/14 (2013.01); C08J 2375/08 (2013.01)]

16 Claims

1. A preparation method of the TPU foam product with the high flatness comprising an aliphatic thermoplastic polyurethane (ATPU) with a melting range of 20° C. to 50° C. and a melting point of 90° C. to 160° C., wherein the TPU foam product with the high flatness has a density of 0.08 g/cm³to 0.8 g/cm³and a flatness value of less than 2 mm comprising the following steps:

a) processing ATPU beads with a melting range of 20° C. to 50° C. and a melting point of 90° C. to 160° C. by a physical gas foaming process to obtain foamed ATPU beads; and

b) filling the foamed ATPU beads obtained in step a) into a mold, and heating the foamed ATPU beads with a heat source so the foamed ATPU beads fuse to each other to obtain the TPU foam product with the high flatness;

wherein the ATPU beads are prepared from an aliphatic isocyanate, a polyhydroxy compound, a chain extender, and an additive;

the polyhydroxy compound and the aliphatic isocyanate undergo a polymerization reaction;

the polyhydroxy compound, the aliphatic isocyanate, the chain extender, and the additive are in a weight ratio of 1:(0.2-0.8):(0.02-0.2):(0.005-0.05); and

the additive is at least one selected from the group consisting of flame retardant, an antisticking agent, a plasticizer, a lubricant, a pigment, an organic filler, and an inorganic filler.