# US 10,765,970 B2 · Defoamer oil compound, production method therefor, and defoamer composition

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,765,970 B2
- Document ID: US10765970B2
- Status: Granted
- Kind: B2
- Application number: 16/113,495
- Filed: 2018-08-27
- Published: 2018-12-20
- Granted: 2020-09-08
- Earliest claimed: 2014-08-05
- Assignees: Shin-Etsu Chemical Co., Ltd.
- Applicants: Shin-Etsu Chemical Co., Ltd.
- Inventors: Akihiro Kobayashi; Chinami Matsui; Takato Sakurai; Shunji Aoki
- Web page: https://patentgrep.com/patent/US10765970B2

## CPC

- B01D 19/0409: {compounds containing Si-atoms}
- B01D 19/04: by addition of chemical substances
- B01D 19/0431: {containing aromatic rings}
- C08G 77/18: to alkoxy or aryloxy groups
- C08K 3/36: Silica
- C08L 83/04: Polysiloxanes
- C08L 83/06: containing silicon bound to oxygen-containing groups (C08L83/12 takes precedence)
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The present invention relates to a defoamer oil compound that contains an organopolysiloxane (A), a fine silica powder (B), and a group (C) that is represented by the organopolysiloxanes of formulas (I) and/or (II) (in the formulas, c, d, and e are each an integer of 0 or more, and at least one of X1 to X3 is the group represented by formula (i)). The component (C) is used as a surface treatment agent for the component (B). The present invention makes it possible to obtain a silicone-based defoamer composition that imparts good initial defoaming properties even in an alkaline foaming liquid, that exhibits very little loss in performance over time, and that has excellent defoaming performance.

## Claims

### Claim 1

An oil compound for a defoamer, comprising:
(A) 100 parts by weight of an inherently hydrophobic organopolysiloxane having a viscosity at 25° C. of from 10 to 100,000 mm2/s,
(B) from 1 to 30 parts by weight of a fine silica powder having a specific surface area of at least 50 m2/g, and
(C) from 0.001 to 5 parts by weight of an organopolysiloxane of general formula (I) and/or (II) below
(wherein X is an organic group selected from R1 and Y—O—; Y is an organic group represented by —SiR13-a(OR2)a; R1 and R2are methyl; a is 2 or 3; and m is an integer of 2 or more)
[wherein each R1 is as defined above, X1 and X2 are each independently R1 or a group of formula (i) below
(wherein R1 and R2 are as defined above; a is 2 to 3;and b is an integer of 2 or more), each Y is independently a group of formula (ii) below
(wherein R1 and X2 are as defined above, X3 is the same as X1, and f is an integer of 0 or more), and c, d and e are each integers of 0 or more, with the proviso that at least one of X1 to X3 is a group of formula (i)],
wherein component (C) serves as a surface treatment agent for component (B).

### Claim 2 (depends on 1)

A defoamer composition characterized by comprising the oil compound of claim 1.

### Claim 3 (depends on 2)

The defoamer composition of claim 2 which is a solution type composition.

### Claim 4 (depends on 3)

The defoamer composition of claim 3, comprising:
5 to 80 wt% of the oil compound; and
a solvent.

### Claim 5 (depends on 2)

The defoamer composition of claim 2 which is a self-emulsifying composition comprising the oil compound together with a polyoxyalkylene group-modified organopolysiloxane.

### Claim 6 (depends on 5)

The defoamer composition of claim 5, comprising:
5 to 80 wt% of the oil compound; and
20 to 95 wt% of a polyoxyalkylene group-modified organopolysiloxane having a following general formula (III):
R42R6SiO—(R42SiO)0—(R4R5SiO)p—SiR42R6 (III)
wherein each R4 is the same or different, unsubstituted or substituted monovalent hydrocarbon group of 1 to 18 carbon atoms, R5 is a polyoxyalkylene group of the following general formula (IV):
—R7—O(CH2CH2O)q—(CH2(CH3)CHO)r—R8 (IV)
wherein R7 is a divalent hydrocarbon group of 2 to 6 carbon atoms, R8 is a hydrogen atom, an alkyl group of 1 to 6 carbon atoms, an acetyl group or an isocyanate group, “q” and “r” are positive numbers wherein the degree of polymerization (q+r) satisfies the conditions 3≤q+r ≤80 and q/r =2/8 to 8/2, R6 is a hydroxyl group, an alkoxy group of 1 to 6 carbon atoms, or a group similar to R4 or R5, “o” is an integer from 5 to 200, and “p” is an integer from 1 to 30.

### Claim 7 (depends on 2)

The defoamer composition of claim 2 which is an emulsion type composition.

### Claim 8 (depends on 7)

The defoamer composition of claim 7, comprising:
5 to 50 wt% of the oil compound; and
an emulsifying agent selected from the group consisting of polyoxyalkylene group-modified organopolysiloxane, polyoxyalkylene polymer, and nonionic surfactant or a mixture of two or more of said emulsifying agents; and
water.

### Claim 9 (depends on 2, 3, 5)

The defoamer composition of any one of claims 2, 3, 5, or 7 which is for an alkaline foaming liquid.

### Claim 10 (depends on 1)

The oil compound of claim 1, wherein component (A) is a linear or branched organopolysiloxane having average compositional formula (II):
R3gSiO(4-g)/2 (II)
wherein each R3 is an unsubstituted or substituted monovalent hydrocarbon group of 1 to 18 carbon atoms, wherein each R3 may be the same or different, and g is a positive number between 1.9≤g ≤2.2.