| 摘要 |
<p>Anti-foam formulation containing an organopolysiloxane An anti-foam composition comprising a) a dispersion of a silicon dioxide filler in an organopolysiloxane, b) an emulsifier or dispersant, and c) at least one water soluble compound selected from the group consisting of i) a divalent aliphatic alcohol containing 4 to 10 carbon atoms, ii) a trivalent aliphatic alcohol containing 2 to 10 carbon atoms, and iii) R1O(-CH2-CH2-O)nR2, , R1O(-CH2-CH2-CH2-O)nR2 and in which R1 and R2 each independently is hydrogen, C1-8-alkyl or C1-8-alkyl-CO-, and n,m,p and r are so chosen that the molecular weight of (c) does not exceed 499. Advantageously, based upon (a) plus (b) plus (c) the composition by weight comprises about 25 to 35% (a), about 8 to 12% (b) and about 53 to 67% (c), the composition additionally containing water in up to about 45% by weight of the entire composition. The composition is more readily water-disper-sible and of better anti-foaming action than heretofore. Le A 20 258</p> |
