Metal chelating compositions

US6623655B1 · kind B1 · utility

Assignee

• Sigma-Aldrich Co. LLC · US

Inventors

• William Kappel · Oakville, US
• Venkatappa Viswanatha · Ballwin, US
• Handong Li · San Jose, US
• Richard Mehigh · Oakville, US
• John Dapron · Oakville, US

Key dates

• Filing date: Apr 24, 2000
• Grant date: Sep 23, 2003
• Expiry date: Apr 24, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T436/25125
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A metal chelating composition having the formula: whereinQ is a carrier;S1 is a spacer;L is —A—T—CH(X)— or —C(═O)—;A is an ether, thioether, selenoether, or amide linkage;T is a bond or substituted or unsubstituted alkyl or alkenyl;X is —(CH2)kCH3, —(CH2)kCOOH, —(CH2)kSO3H, —(CH2)kPO3H2, —(CH2)kN(J)2, or —(CH2)kP (J)2, preferably —(CH2)kCOOH or —(CH2)kSO3H;k is an integer from 0 to 2;J is hydrocarbyl or substituted hydrocarbyl;Y is —COOH, —H, —SO3H, —PO3H2, —N(J)2, or —P(J)2, preferably, —COOH;Z is —COOH, —H, —SO3H, —PO3H2, —N(J)2, or —P(J)2, preferably, —COOH; andi is an integer from 0 to 4, preferably 1 or 2.