Patent ID: 6685766
Filing Date: 2004-02-03
Classification: C04B,C23C,C23F

Abstract:
A composition for protecting steel-reinforced concrete against corrosion of the steel reinforcement, wherein the composition comprises, as a component A, at least one organosilane or organosiloxane of the formula (I)Râ€”SiR1x(O)yR2zâ€ƒâ€ƒ(I), whereR is a linear or branched alkyl group having from 3 to 20 carbon atoms; R1 is a linear or branched alkyl group having from 1 to 4 carbon atoms; R2 is a linear or branched alkoxy group having from 1 to 4 carbon atoms or a hydroxy group, where groups may be identical or different; x is 0, 1 or 2; y is from 0.0 to 1.5; z is 0, 1, 2 or 3; and (x+2y+z)=3, wherein the composition is an oil-in-water emulsion; and an oil phase of the oil-in-water emulsion comprises at least one of the component A, a component B, a component C, and a component D, where the component B comprises at least one aminosilane or aminosiloxane of the formula (II) R42Nâ€”(R5â€”NR)aâ€”R6â€”Si(R7)bOc(OR8)dâ€ƒâ€ƒ(II) whereR4 is a hydrogen atom or a linear or branched alkyl group having from 1 to 20 carbon atoms, and groups R4 are identical or different; R5 is a linear or branched alkylene group having from 1 to 20 carbon atoms; R6 is a linear or branched alkylene group having from 1 to 20 carbon atoms; R7 is a linear or branched alkyl group having from 1 to 4 carbon atoms; R8 is a hydrogen atom or a linear or branched alkyl group having from 1 to 4 carbon atoms, and groups R8 are identical or different; a is 0, 1, 2, 3 or 4; b is 0, 1 or 2; c is from 0.0 to 1.5; d is 0, 1, 2 or 3; and (b+2c+d)=3; the component C comprises at least one carboxylic acid or salt of a carboxylic acid; and the component D comprises at least one aminoalcohol of the formula (III) HOâ€”CH2â€”CH2â€”NR92â€ƒâ€ƒ(III) wheregroups R9 are identical or different; and R9 is a hydrogen atom or a linear or branched alkyl group having from 1 to 20 carbon atoms.