# US 2019/0375643 A1 · Increased particle loading by surface modification with polyethersilane

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- Number: US 2019/0375643 A1
- Document ID: US20190375643A1
- Status: Published application
- Kind: A1
- Application number: 16/435,638
- Filed: 2019-06-10
- Published: 2019-12-12
- Earliest claimed: 2018-06-12
- Assignees: Evonik Degussa GmbH; Evonik Corporation
- Applicants: Evonik Degussa GmbH; Evonik Corporation
- Inventors: Zhifeng LI; Helmut Mack
- Web page: https://patentgrep.com/patent/US20190375643A1

## CPC

- C01B 33/149: Coating
- C09K 3/1409: {Abrasive particles per se (preparation of diamond C01B32/25)}
- C09K 3/1436: {Composite particles, e.g. coated particles}
- C09K 3/1463: {Aqueous liquid suspensions}
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

A modified colloidal silica is produced by mixing an effective amount of an alkyl silicate to form a colloidal silica, followed by treating the colloidal silica with an effective amount of a polyethersilane to form a modified colloidal silica.

## Claims

### Claim 1

A modified colloidal silica produced by a process comprising:
mixing an alkyl silicate to form a colloidal silica and
treating the colloidal silica with an amount of a polyethersilane to form a modified colloidal silica.

### Claim 2 (depends on 1)

The modified colloidal silica of claim 1, wherein 0.1-10 wt % of the polyethersilane, based on the weight of a mother liquid of colloidal silane, is used to treat the mother liquid of the colloidal silica.

### Claim 3 (depends on 1)

The modified colloidal silica of claim 1, wherein the alkyl silicate is a tetraalkyl orthosilicate.

### Claim 4 (depends on 3)

The modified colloidal silica of claim 3, wherein the tetraalkyl orthosilicate is at least one selected from the group consisting of tetramethyl orthosilicate and tetraethyl orthosilicate.

### Claim 5 (depends on 1)

The modified colloidal silica of claim 1, wherein the polyethersilane is represented by the formula CH3(CH2)rO[(CH2)mO]p(CH2)nSi(OR1)qR2(3-q),
wherein
R1 is a methyl or ethyl group,
R2 is a methyl or ethyl group,
n=0-4,
p=0-30,
m=1-3,
r=0-5, and
q=1-3.

### Claim 6 (depends on 5)

The modified colloidal silica of claim 5,
wherein
R1 and R2 are methyl groups,
n is 1-3,
p is 1-7,
m is 2,
r is 0, and
q is 3.

### Claim 7 (depends on 5)

The modified colloidal silica of claim 5, wherein n is 3 and p is 2-5.

### Claim 8 (depends on 7)

The modified colloidal silica of claim 7, wherein the polyethersilane is at least one selected from the group consisting of
2-[methoxy(polyethyleneoxy)propyl]trimethoxysilane,
2-[methoxy(polyethyleneoxy)propyl]methyldimethoxysilane, and
2-[methoxy(polyethyleneoxy)propyl]dimethylmethoxysilane.

### Claim 9 (depends on 1)

A polishing material, comprising: the modified colloidal silica of claim 1.

### Claim 10

A method for producing a modified colloidal silica, comprising:
1) preparing a mother liquid comprising an alkali catalyst and water;
2) adding an amount of a hydrolyzed liquid obtained by hydrolyzing an alkyl silicate to the mother liquid forming a colloidal silica; and
3) treating the colloidal silica with an amount of polyethersilane to form a modified colloidal silica.

### Claim 11 (depends on 10)

The method of claim 10, wherein 0.1-10 wt % of the polyethersilane, based on the weight of a mother liquid of colloidal silane, is used to treat the mother liquid of the colloidal silica.

### Claim 12 (depends on 10)

The method of claim 10, further comprising:
preparing the hydrolyzed liquid by hydrolyzing the alkyl silicate in absence of the catalyst.

### Claim 13 (depends on 10)

The method of claim 10, wherein the mother liquid further comprises seed particles.

### Claim 14 (depends on 10)

The method of claim 10, wherein the alkyl silicate is tetraalkyl orthosilicate.

### Claim 15 (depends on 14)

The method of claim 14, wherein the alkyl silicate is tetramethyl orthosilicate or tetraethyl orthosilicate

### Claim 16 (depends on 10)

The method of claim 10, wherein the polyethersilane is at least one selected from the group consisting of
2-[methoxy(polyethyleneoxy)propyl]trimethoxysilane,
2-[methoxy(polyethyleneoxy)propyl]methyldimethoxysilane, and
2-[methoxy(polyethyleneoxy)propyl]dimethylmethoxysilane.