Alkylene oxide block polymers usable as defoamers

Details Alkylene oxide block polymers usable as defoamers Alkylene oxide block polymers usable as defoamers

C - Chemistry, Metallurgy

08

G

400/2018, 134/54

C08G 65/28 (2006.01) B01D 19/04 (2006.01) C08G 65/26 (2006.01) C11D 3/00 (2006.01) C11D 3/37 (2006.01)

Patent

CA 1252929

ABSTRACT OF THE DISCLOSURE Block polymers usable as defoamers have the following formula Image in which R represents a glycerol or polyglycerol func- tion having a degree of polymerization x of from 1 to 6 and the indices y is equal to (x - z + 2), z is equal to (x-y+2), a is equal to 1 to 15, b is equal to 50 to 200 c is equal to 1 to 15, d is equal to 20 to 150 and e is equal to 1 to 15, with the proviso that the sums (a + c + e) is equal to 2 to 20, (b + d) is equal to 50 to 250 and (c + e) is equal to 1 to 15, and y has a value of at least 1. The block polymers are prepared by reaction of gly- cerol or polyglycerol having a degree of polymerization x with ethylene oxide, then with propylene oxide and, finally, again with ethylene oxide, preferably in the presence of alkaline etherification catalysts.

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