| 摘要 |
PROBLEM TO BE SOLVED: To obtain a working fluid which can inhibit mist appearance in metal working application by incorporating water and a copolymer formed from a specific hydrophobic monomer, a specific hydrophilic monomer, and an ethylenically unsatd. branched monomer into the same. SOLUTION: This working fluid contains water and a copolymer which is formed from (A) a hydrophobic monomer comprising an alkyl-substd. acrylamide of formula I and/or an acrylic ester of formula II, (B) a hydrophilic monomer comprising a sulfonic acid (salt) of formula III and/or styrenesulfonic acid or its salt, and (C) an ethylenically unsatd. branched monomer, both the molar ratio of A/B and the amt. of C being specified. In the formulas, R1 is H or CB3 ; R2 and R3 are each H or hydrocarbyl provided the sum of their numbers of carbon atoms is 2 to about 36; R9 is hydrocarbyl or an alkyl- terminated polyether group; X is O or NY; Y is H, 1-18C hydrocarbyl, or -R(-SO3 H)n ; R4 is R1 ; R is a 2 to about 18C aliph. or arom. hydrocarbylene group; and n is 1 or 2. The salt of monomer B is e.g. an alkali or alkaline earth metal salt. |
