Defoamer composition based on organofunctionally modified polybutadienes

A defoamer composition, comprising:

• a compound based on polybutadiene having at least one repeat unit selected from the group consisting of divalent radicals
• wherein
• A is in each case independently a monovalent organic radical;
• B is in each case independently a radical of the formula (4a)
• R1 is in each case independently a monovalent hydrocarbon radical having 1 to 16 carbon atoms;
• R2 is a radical of the formula ˜CH2—O—R3;
• R3 is in each case independently a monovalent hydrocarbon radical having 3 to 18 carbon atoms;
• R4 is in each case independently a monovalent organic radical having 1 to 18 carbon atoms or hydrogen;
• m, n, o, p and q are each independently 0 to 300, with the proviso that a sum total of m, n, o, p and q is greater than 1;
• and
• wherein the B radical has at least one repeat unit in accordance with
• including every permutation of repeat units in B.