Corrosion inhibiting compositions
AssigneeRohm and Haas Company
InventorsTirthankar Ghosh, William M. Hann, Barry Weinstein
Life of this patent
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Abstract
A new class of polymeric corrosion inhibiting compositions incorporating pendant heterocyclic groups which are surprisingly effective copper corrosion inhibitors are disclosed. The polymers form a protective barrier on metallic components to aqueous systems and remain substantive on metallic surfaces over a wide pH range. Moreover, the polymers are resistant to oxidizing biocides, and are substantially impervious to repeated or prolonged exposure to corrosive agents.
Claims10
A polymer comprising at least one repeating unit of Formula Ia:
- Formula Ia
- wherein n is 0 or 1;
- R and R1 are independently selected from the group consisting of hydrogen, methyl, and C2-C4 alkyl;
- R2 is selected from the group consisting of C1-C8 branched and straight chain alkyl groups, C1-C8 branched and straight chain alkenyl groups, C3-C8 cyclic alkyl groups, C2-C4 alkylene oxide groups and poly(C2-C4 alkylene)m oxides wherein m=2-20;
- a pendant heterocycle comprising unsaturated or aromatic heterocycles having one or more hetero atoms selected from the group N, O, S and combinations thereof, the pendant heterocycle chemically bonded to the R2 group via a hetero atom which is part of the heterocycle or a carbon atom of the heterocycle;
- R3 is selected from the group consisting of hydrogen, methyl, ethyl, C3—C18 branched and straight chain, alkyl and alkenyl groups;
- and R4 is selected from the group consisting of H, CH3, C2H5, C6H5 and C3-C18 branched and straight chain alkyl groups and C3-C18 alkenyl groups.
A polymer comprising one or more repeating units of a functionalized imide component having Formula Ia and a functionalized bride component having Formula Ib:
- wherein n is 0 or 1;
- R and R1 are independently selected from the group consisting of hydrogen, methyl, and C2-C4 alkyl;
- R2 is selected from the group consisting of C1-C8 branched and straight chain alkyl groups, C1-C8 branched and straight chain alkenyl groups, C3-C8 cyclic alkyl groups, C2-C4 alkylene oxide groups and poly(C2-C4 alkylene)m oxides wherein m=2-20;
- a pendant heterocycle comprising unsaturated or aromatic heterocycles having one or more hetero atoms selected from the group N, O, S and combinations thereof, the pendant heterocycle chemically bonded to the R2 group via a hetero atom which is part of the heterocycle or a carbon atom of the heterocycle;
- R3 is selected from the group consisting of hydrogen, methyl, ethyl, C3-C18 branched and straight chain, alkyl and alkenyl groups;
- and R4 is selected from the group consisting of H, CH3, C2H5, C6H5, C3-C18 branched and straight chain alkyl groups and C3-C18 alkenyl groups.
A corrosion inhibiting polymer comprising chemical components A, B and C;
- wherein A optionally includes one or more end groups selected from initiator fragments, chain transfer fragments, solvent fragments and combinations thereof;
- wherein B includes at least one repeating unit selected from a functionalized imide component of Formula Ia, a functionalized amide component of Formula Ib and combinations of Ia and Ib;
- and wherein C represents one or more ethylenically unsaturated monomers of Formula II:
- CH(R5)═C(R6)(R7) Formula II
- wherein R5 is selected from hydrogen, phenyl, methyl, ethyl, C3-C18 branched and straight chain alkyl and alkenyl groups;
- R6 is independently selected from hydrogen, methyl, ethyl, phenyl, C3-C18 branched and straight chain alkyl and alkenyl groups, OR8 and CH2OR8 wherein R8 is acetate, glycidyl, methyl, ethyl, C3-C18 branched and straight chain alkyl and alkenyl groups, and groups having the formula [CH2CH(Ra)O]mRb wherein Ra is hydrogen, methyl, ethyl, and phenyl, m is an integer from 2-20 and Rb is independently hydrogen, methyl, ethyl, phenyl and benzyl;
- and R7 is independently selected from H, CH3, C2H5, CN, a COR9 wherein R9 is OH, NH2, OR8 group wherein R8 is described previously and a NRcRd wherein Rc and Rd are the same group or different groups, are parts of a 5-membered or 6-membered ring system, hydrogen, hydroxymethyl, methoxy methyl, ethyl and C3-C18 branched and straight chain alkyl and alkenyl groups branched and straight chain alkyl and alkenyl groups.
Dependencies are inferred from the claim text.