Karl Schmid, Horst Baumann, Jurgen Geke, Hans Gunther Germscheid, Werner Ludecke, Robert Piorr, Christian Rossmann, Rolf Scharf, Hans Joachim Schlussler: Polyglycol ethers as foam-inhibiting additives in low-foam cleaning agents. Henkel Kommanditgesellschaft, Ernest G Szoke, Nelson Littell Jr, Henry E Millson Jr, June 11, 1985: US04522740 (17 worldwide citation)

Polyethylene glycol ethers of the type obtained by the addition of from 4 to 20 parts by weight of ethylene oxide onto 1 part by weight of polyglycerol having a hydroxyl number in the range from 900 to 1200 and subsequent etherification of the free hydroxyl groups with linear or branched alkyl halid ...