US 12,403,678 B2
Anti-slip pad with high coefficient of static friction
Ming-Hui Lin, Taichung (TW); and Sung-Yen Kung, Taichung (TW)
Assigned to HERTIDE MATERIAL CO., Taichung (TW)
Filed by Hertide Material Co., Taichung (TW)
Filed on Jan. 16, 2023, as Appl. No. 18/097,299.
Claims priority of application No. 111137333 (TW), filed on Sep. 30, 2022.
Prior Publication US 2024/0123711 A1, Apr. 18, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. B32B 27/06 (2006.01); B32B 5/18 (2006.01); B32B 27/36 (2006.01); B32B 27/40 (2006.01)
CPC B32B 27/065 (2013.01) [B32B 5/18 (2013.01); B32B 27/36 (2013.01); B32B 27/40 (2013.01); B32B 2266/0264 (2013.01); B32B 2266/0278 (2013.01); B32B 2274/00 (2013.01); B32B 2305/022 (2013.01); B32B 2307/72 (2013.01); B32B 2307/724 (2013.01); B32B 2307/732 (2013.01); B32B 2307/744 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An anti-slip pad with high coefficient of static friction, which comprises a surface layer and a foamed inner layer, the foamed inner layer covered by the surface layer;
wherein the surface layer is an air-permeable surface layer having a thickness of 50 μm to 600 μm, and the surface layer has a permeability from 250 g/m2/24 h to 3000 g/m2/24 h according to the standard method JIS L1099A1;
wherein the foamed inner layer comprises multiple pores, the pores comprise multiple closed pores and multiple open pores, and the open pores are in a proportion of from larger than 45% to 75% according to the standard method ASTM D6226; wherein the anti-slip pad with high coefficient of static friction has an average density of 0.35 g/cm3 to 0.62 g/cm3 according to the standard method ISO 1183; the anti-slip pad with high coefficient of static friction has a coefficient of static friction of 0.58 to 1.4 at 200 g sled weight as determined according to standard method ASTM D1894; and the anti-slip pad with high coefficient of static friction is prepared by a method comprising the following steps:
(1) providing a polymer material comprising a thermoplastic ether ester elastomer, a thermoplastic polyurethane or a combination thereof; wherein the polymer material has elongation at break of 300% or more, the thermoplastic ether ester elastomer has a melt flow index at 230° C. of 20 g/10 min or less and Shore D hardness of 30D to 45D, and the thermoplastic polyurethane has a melt flow index at 205° C. of 25 g/10 min or less and Shore A hardness of 60A to 95A;
(2) melting the polymer material to obtain a molten polymer material;
(3) adding a supercritical fluid into the molten polymer material to obtain a mixture, and compounding the mixture to obtain a supercritical fluid blend; and
(4) injecting and molding the supercritical fluid blend to obtain the anti-slip pad with high coefficient of static friction.