Process for removing bubbles of gas from liquids

Claim 2

A PROCESS FOR TREATING A LIQUID WHICH IS A HYDRAULIC FLUID A HEATING FLUID, A LUBRICATING OIL OR A PRINTING INK, TO REMOVE BUBBLES OF GAS DISPERSED THERIN OR TO INHABIT FORMATION OF THE DISPERSION OF GAS THEREIN WHICH COMPRISES INCORPORATING INTO THE LIQUID IN AN AMOUNT OF 0.0001% TO 0.25% OF THE WEIGHT OF THE LIQUID AN ORGANOSILICON COMPOUND CONTAINING AT LEAST ONE OXIRANE RING, WHICH IS BONDED TO A SILICON ATOM OR FORMS PART OF AN ORGANIC RADICAL BONDED TO A SILICON ATOM BY A SI-C BOND, AND SELECTED FROM THE GROUP CONSISTING OF: A. SILANES OF THEGENERAL FORMULA (X)3-ARASID IN WHICH THE SYMBOL X REPRESENTS A HYDROLYSABLE GROUP, THE SYMBOL R A MONOVALENT HYDROCARBON GROUP, OR A MONOVALENT HALOGENO-HYDROCARBON GROUP, THE SYMBOL D AN OXIRANE RADICAL BONDED DIRECTLY TO THE SILICON ATOM ORA MONOVALENT ORGANIC RADICALCONTAINING AN OXIRANE RING AND BONDED TO THE SILICON ATOM BY A SI-C BOND, AND THE SYMBOL A REPRESENTS 0,1, OR 3, B. ORGANOPOLYSILOXANE HOMOPOLYMERS CONSISTING OF UNITS OF THE FORMULA:

Claim 3

A process for treating a liquid which is a hydraulic fluid, a heating fluid, a lubricating oil or a printing ink, to remove bubbles of gas dispersed therein or to inhibit formation of the dispersion of gas therein which comprises incorporating into the liquid in an amount of 0.0001% to 0.25% of the weight of the liquid an organosilicon compound containing at least one oxirane ring, which is bonded directly to a silicon atom or forms part of an organic radical bonded to a silicon atom by a Si-C bond, and selected from the group consisting of: a. silanes of the general formula (X)3 aRaSiD in which the symbol X represents a hydrolysable group, the symbol R a monovalent hydrocarbon group or a monovalent halogeno-hydrocarbon group, the symbol D an oxirane radical bonded directly to the silicon atom or a monovalent organic radical containing an oxirane ring and bonded to the silicon atom by a Si-C bond, and the symbol a represents 0, 1, 2 or 3, b. organopolysiloxane homopolymers consisting of units of the formula:

Claim 4

A process for treating a liquid which is a hydraulic fluid, a heating fluid, a lubricating oil or a printing ink, to remove bubbles of gas dispersed therein or to inhibit formation of the dispersion of gas therein which comprises incorporating into the liquid in an amount of 0.0001% to 0.25% of the weight of the liquid an organosilicon compound containing at least one oxirane ring, which is bonded directly to a silicon atom or forms part of an organic radical bonded to a silicon atom by a Si-C bond, and selected from the group consisting of: a. silanes of the general formula (X)3 aRaSiD in which the symbol X represents a hydrolysable group, the symbol R a monovalent hydrocarbon group or a monovalent halogeno-hydrocarbon group, the symbol D an oxirane radical bonded directly to the silicon atom or a monovalent organic radical containing an oxirane ring and bonded to the silicon atom by a Si-C bond, and the symbol a represents 0, 1, 2 or 3, b. organopolysiloxane homopolymers consisting of units of the formula:

Claim 5

A process according to claim 1 wherein the organosilicon compound is a silane in which X represents a halogen atom, an alkoxy radical with one to four carbon atoms, an alkoxyalkoxy radical with three or four carbon atoms, an acyloxy radical with one to three carbon atoms, a ketoniminoxy radical with three to five carbon atoms, an aldiminoxy radical with two to four carbon atoms, a dialkyl aminoxy radical with two to four carbon atoms or an organoaminyl radical with two to six carbon atoms.

Claim 6

A process according to claim 2 wherein a represents 0 and X represents an alkoxy radical with one to four carbon atoms.

Claim 7

A process according to claim 1 wherein the organosilicon compound is an organopolysiloxane homopolymer in which X represents a halogen atom, an alkoxy radical with one to four carbon atoms, an alkoxyalkoxy radical with three or four carbon atoms, an acyloxy radical with one to three carbon atoms, a ketoniminoxy radical with three to five carbon atoms, an aldiminoxy radical with two to four carbon atoms a dialkyl aminoxy radical with two to four carbon atoms or an organoaminyl radical with two to six carbon atoms.

Claim 8

A process according to claim 1 wherein the organosilicon compound is an organopolysiloxane copolymer in which X represents a halogen atom, an alkoxy radical with one to four carbon atoms, an alkoxyalkoxy radical with three or four carbon atoms, an acyloxy radical with one to three carbon atoms, a ketoniminoxy radical with three to five carbon atoms, an aldiminoxy radical with two to four carbon atoms, a dialkyl aminoxy radical with two to four carbon atoms or an organoaminyl radical with two to six carbon atoms.

Claim 9

A process according to claim 1 which comprises incorporating also an organosilicon antifoaming agent which is a diorganopolysiloxane oil or rubber, blocked at each end of the chain by triorganosiloxy groups or hydroxyl or lower alkoxy groups, of viscosity 50 cP at 25*C to 25,000,000 cP at 25*C, mixtures of these oils and rubbers with pyrogenic silica or with precipitated silica, which are untreated or treated with organosilicon compounds, copolymers containing polysiloxane/polyoxyalkylene blocks and organopolysiloxane resins consisting of units chosen from amongst those of the formulae SiO2, YSiO1.5, Y2SiO and Y3SiO0.5; the symbols Y represent a methyl, 3,3,3,-trifluoro-propyl, phenyl, chlorophenyl or tetrachlorophenyl radical and the average number of groups Y per Si atom ranges from 0.9 to 1.95.