IP Library Granted Patent US 12,496,571
Granted Patent B2
US 12,496,571 · App. 17/897,525 · Granted Dec 16, 2025

Primary amine aerogel and method of manufacture

Inventors: Kelly Xia (Berkeley, CA); Stephen Matthew Meckler (Boulder, CO); Jonathan Bachman (San Francisco, CA); Mahati Chintapalli (Mountain View, CA); Gabriel Iftime (Newark, CA)
Assignee: XEROX CORPORATION
B01J20/262B01J20/28047B01J20/28061
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Quick Facts
Patent No.
US 12,496,571
App. No.
17/897,525
Granted
Dec 16, 2025
Kind
B2
Abstract

A polymer compound containing groups having the chemical structure: where NH 2 is a primary amine, and R is not hydrogen, and a polymer backbone wherein two of the R groups are part of the polymer backbone. A method of synthesizing a polymer includes polymerizing amine-convertible monomers to produce a polymer, causing a deprotection reaction with the polymer to form an isocyanate, decomposing the isocyanate to form a polymer containing primary amines. A method to separate CO 2 from other gases comprising using a sorbent containing a polymer compound having the structure: where NH 2 is a primary amine, and R is not hydrogen, and a polymer backbone wherein two of the R groups are part of the polymer backbone.

Claims (9)

1 . A polymer compound containing groups having the chemical structure:

where NH 2 is a primary amine, and R 1 , R 2 and R 3 are not hydrogen atoms; and

a polymer backbone wherein R 1 and R 3 are part of the polymer backbone,

wherein R 2 is selected from the group consisting of: amino, hydroxyl, perfluoro, fluoro, chloro, nitro, cyano, and heterocyclic.

2 . The polymer compound as claimed in claim 1 , wherein the polymer compound has an alkylene backbone.

3 . The polymer compound as claimed in claim 1 , wherein the polymer compound is formed by copolymerization of only amine-convertible monomers with one or more cross linkers.

4 . The polymer compound as claimed in claim 1 , wherein the polymer compound is a copolymer with non-amine-convertible monomers.

5 . A porous aerogel comprising the polymer compound of claim 1 .

6 . The porous aerogel of claim 5 , having at least one of the characteristics selected from the group consisting of a porosity of greater than 10%, a specific surface area of at least 100 m 2 /g, a BET (Brunauer-Emmett-Teller) of greater than 50 m 2 /g, and a wall thickness in the range of 10-1000 nanometers.

Assignments (7)
SECOND LIEN NOTES PATENT SECURITY AGREEMENT Recorded Jul 2, 2025
From: XEROX CORPORATION
To: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, AS COLLATERAL AGENT
Reel/Frame 071785/0550 →
FIRST LIEN NOTES PATENT SECURITY AGREEMENT Recorded Apr 11, 2025
From: XEROX CORPORATION
To: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, AS COLLATERAL AGENT
Reel/Frame 070824/0001 →
SECURITY INTEREST Recorded Feb 13, 2024
From: XEROX CORPORATION
To: CITIBANK, N.A., AS COLLATERAL AGENT
Reel/Frame 066741/0001 →
SECURITY INTEREST Recorded Nov 20, 2023
From: XEROX CORPORATION
To: JEFFERIES FINANCE LLC, AS COLLATERAL AGENT
Reel/Frame 065628/0019 →
CORRECTIVE ASSIGNMENT TO CORRECT THE REMOVAL OF US PATENTS 9356603, 10026651, 10626048 AND INCLUSION OF US PATENT 7167871 PREVIOUSLY RECORDED ON REEL 064038 FRAME 0001. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Recorded Jun 28, 2023
From: PALO ALTO RESEARCH CENTER INCORPORATED
To: XEROX CORPORATION
Reel/Frame 064161/0001 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 20, 2023
From: PALO ALTO RESEARCH CENTER INCORPORATED
To: XEROX CORPORATION
Reel/Frame 064038/0001 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 29, 2022
From: XIA, KELLY; MECKLER, STEPHEN MATTHEW; BACHMAN, JONATHAN; CHINTAPALLI, MAHATI; IFTIME, GABRIEL
To: PALO ALTO RESEARCH CENTER INCORPORATED
Reel/Frame 060926/0074 →
Continuity (1)
Related Publication 20240082818A1 · Mar 14, 2024
References Cited (5)
US 4713236A · Hoover · 1987 [cited by examiner]
US 5925379A · Mandeville, III · 1999 [cited by examiner]
US 20210370226A1 · Chintapalli et al. · 2021 [cited by applicant]
Lee et al., “Silica-Supported Sterically Hindered Amines for CO2 Capture,” Langmuir 34:41, pp. 12279-12292, Sep. 24, 2018. [cited by applicant]
Koutsianos, et al. “Drastic enhancement of carbon dioxide adsorption in fluoroalkyl-modified poly(allylamine),” J. Mater. Chem. A, 9, pp. 10827-10837. [cited by applicant]