US 11,702,544 B2
Ground tire rubber density modification using elastomeric polymers
Eric W. Cochran, Ames, IA (US); Nacu Hernandez, Ames, IA (US); and Ronald Christopher Williams, Ames, IA (US)
Assigned to IOWA STATE UNIVERSITY RESEARCH FOUNDATION, INC., Ames, IA (US)
Filed by Iowa State University Research Foundation, Inc., Ames, IA (US)
Filed on Dec. 27, 2021, as Appl. No. 17/562,548.
Application 17/562,548 is a continuation of application No. 16/445,866, filed on Jun. 19, 2019, granted, now 11,242,459.
Claims priority of provisional application 62/688,604, filed on Jun. 22, 2018.
Prior Publication US 2022/0186032 A1, Jun. 16, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C08L 95/00 (2006.01); C08L 9/06 (2006.01); C08L 23/22 (2006.01); C08L 91/00 (2006.01)
CPC C08L 95/00 (2013.01) [C08L 9/06 (2013.01); C08L 23/22 (2013.01); C08L 91/00 (2013.01); C08L 2555/34 (2013.01); C08L 2555/72 (2013.01); C08L 2555/84 (2013.01)] 23 Claims
 
1. An asphalt product comprising:
a mineral aggregate;
an asphalt component; and
a plurality of pellets mixed with the asphalt component and comprising a mixture of:
a ground tire rubber (“GTR”); and
an elastomeric polymer, wherein the asphalt component and the plurality of pellets have a difference in density of less than 10%%,
wherein the GTR is modified with the elastomeric polymer such that the modified GTR has a density below the density of the asphalt component.