Hydrophobically modified polyamine scale inhibitors

A composition comprising a polymeric reaction product of

• a polyamine,
• a first nitrogen-reactive compound, and
• a second nitrogen-reactive compound,
• wherein:
• the polyamine comprises a unit of the formula —(CH2)r—NR2—, wherein r is an integer from about 1 to about 20, and R2 is H, optionally substituted C1-C20 alkyl, optionally substituted C6-C12 aryl, optionally substituted C7-C20 aralkyl, or optionally substituted C2-C20 alkenyl;
• the first nitrogen-reactive compound comprises a —Si(OR)3 group and a nitrogen-reactive group, wherein R is H, optionally substituted C1-C20 alkyl, optionally substituted C6-C12 aryl, optionally substituted C7-C20 aralkyl, optionally substituted C2-C20 alkenyl, Group I metal ion, Group II metal ion, or NR14, wherein each R1 is independently selected from H, optionally substituted C1-C20 alkyl, optionally substituted C6-C12 aryl, optionally substituted C7-C20 aralkyl, and optionally substituted C2-C20 alkenyl;
• the second nitrogen-reactive compound is 2-ethylhexyl glycidyl ether;
• and
• at least one of the polyamine and the second nitrogen-reactive compound comprises an optionally substituted hydrocarbyl radical comprising from about 2 to about 40 carbons.