# US 10,479,721 B2 · Use of MgO, ZnO, and rare earth oxides for making improved low dielectric fibers with improved low thermal expansion coefficient for high boron aluminosilicate compositions

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- Number: US 10,479,721 B2
- Document ID: US10479721B2
- Status: Granted
- Kind: B2
- Application number: 15/573,181
- Filed: 2016-05-11
- Published: 2018-05-10
- Granted: 2019-11-19
- Earliest claimed: 2015-05-13
- Applicants: PPG Industries Ohio, Inc.
- Inventors: Hong Li
- Web page: https://patentgrep.com/patent/US10479721B2

## CPC

- C03C 13/00: Fibre or filament compositions (manufacture of fibres or filaments C03B37/00)
- C03C 3/091: containing aluminium
- C03C 3/093: containing zinc or zirconium
- C03C 3/118: containing aluminium
- C03C 13/06: Mineral fibres, e.g. slag wool, mineral wool, rock wool
- H05K 1/0306: {Inorganic insulating substrates, e.g. ceramic, glass}
- C03C 2213/00: Glass fibres or filaments
- H05K 2201/0275: Fibers and reinforcement materials
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

New glass compositions and applications thereof are disclosed. A glass composition as described herein can include 50 to 55 weight percent SiO2, 17 to 26 weight percent B2O3, 13 to 19 weight percent Al2O3, 0 to 8.5 weight percent MgO, 0 to 7.5 weight percent ZnO, 0 to 6 weight percent CaO, 0 to 1.5 weight percent Li2O, 0 to 1.5 weight percent F2, 0 to 1 weight percent Na2O, 0 to 1 weight percent Fe2O3, 0 to 1 weight percent TiO2, and 0 to 8 weight percent of other constituents. Also described herein are glass fibers formed from such compositions, composites, and articles of manufacture comprising the glass compositions and/or glass fibers.

## Claims

### Claim 1

A glass composition suitable for fiber forming comprising:
SiO2 in an amount from 50 to 55 weight percent;
B2O3 in an amount from greater than 20 to 25 weight percent;
Al2O3 in an amount from greater than 14 to 19 weight percent;
MgO in an amount from 0 to 8.5 weight percent;
ZnO in an amount from 0 to 7.5 weight percent;
CaO in an amount from 0 to 6 weight percent;
Li2O in an amount from 0 to 1.5 weight percent;
F2 in an amount greater than 0 to 1.5 weight percent;
Na2O in an amount from 0 to 1 weight percent;
Fe2O3 in an amount from 0 to 1 weight percent;
TiO2 in an amount greater than 0 to 1 weight percent; and
one or more rare earth oxides (RE2O3) in an amount from 0 to 8 weight percent total,
wherein the composition is substantially free of SrO.

### Claim 2 (depends on 1)

The composition of claim 1, wherein the SiO2 content is from 51 to 54 weight percent.

### Claim 3 (depends on 1)

The composition of claim 1, wherein the MgO content is from 2 to 8.5 weight percent.

### Claim 4 (depends on 1)

The composition of claim 1, wherein the ZnO content is from greater than 0 to 5 weight percent.

### Claim 5 (depends on 1)

The composition of claim 1, wherein the Na2O content is from greater than 0 to 0.5 weight percent.

### Claim 6 (depends on 1)

The composition of claim 1, wherein the Li2O content is 0.8 weight percent or less.

### Claim 7 (depends on 1)

The composition of claim 1, wherein the Fe2O3 content is from greater than 0 to 0.5 weight percent.

### Claim 8 (depends on 1)

The composition of claim 1, wherein the TiO2 content is from greater than 0 to 0.6 weight percent.

### Claim 9 (depends on 1)

The composition of claim 1, wherein the glass composition comprises one or more rare earth oxides in an amount greater than 0.01 weight percent.

### Claim 10 (depends on 1)

The composition of claim 1, wherein the one or more rare earth oxides content is from greater than 0 to 7 weight percent.

### Claim 11 (depends on 1)

The composition of claim 1, wherein the one or more rare earth oxides comprise at least one of La2O3, CeO2, Y2O3 and Sc2O3 in an amount of 0 to 8 weight percent total.

### Claim 12 (depends on 1)

The composition of claim 1, wherein the composition is substantially free from BaO.

### Claim 13 (depends on 1)

The composition of claim 1, wherein the Al2O3+MgO content is from 14 to 26.5 weight percent.

### Claim 14 (depends on 1)

The composition of claim 1, wherein the Al2O3 +ZnO content is from 14 to 22 weight percent.

### Claim 15 (depends on 1)

The composition of claim 1, wherein the MgO +CaO content is 9 weight percent or less.

### Claim 16 (depends on 1)

The composition of claim 1, wherein the total Na2O+Li2O content is 1.5 weight percent or less.

### Claim 17 (depends on 1)

The composition of claim 1, wherein the RE2O3+Al2O3 content is from 13 to 22 weight percent.

### Claim 18 (depends on 1)

A fiber formed from a composition of claim 1.

### Claim 19 (depends on 18)

An article of manufacture comprising a fiber of claim 18.

### Claim 20 (depends on 19)

The article of manufacture of claim 19, wherein the article is a printed circuit board.