# US 5,346,868 A · Inorganic fiber

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- Number: US 5,346,868 A
- Document ID: US5346868A
- Status: Granted
- Kind: A
- Application number: 08/073,067
- Filed: 1993-06-08
- Granted: 1994-09-13
- Earliest claimed: 1992-08-26
- Assignees: Didier-Werke AG
- Inventors: Axel Eschner
- Web page: https://patentgrep.com/patent/US5346868A

## CPC

- C04B 35/80: Fibres, filaments, whiskers, platelets, or the like
- C03C 13/06: Mineral fibres, e.g. slag wool, mineral wool, rock wool
- C04B 30/02: containing fibrous materials
- C04B 35/01: based on oxide ceramics
- C04B 35/62236: {Fibres based on aluminium oxide}
- C04B 35/62665: {Flame, plasma or melting treatment}
- C04B 38/00: Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof (treating slag with gases or gas generating material C04B5/06 {; expanded graphite C04B35/536})
- D01D 5/0985: {by means of a flowing gas (e.g. melt-blowing)}
- D01F 9/08: of inorganic material (working or processing of metal wire B21F; from softened glass, minerals or slags C03B37/00)
- C03C 2213/02: Biodegradable glass fibres
- C04B 2111/28: Fire resistance, i.e. materials resistant to accidental fires or high temperatures
- C04B 2235/3208: Calcium oxide or oxide-forming salts thereof, e.g. lime
- C04B 2235/3418: Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
- C04B 2235/448: Sulphates or sulphites
- C04B 2235/526: characterised by the length of the fibers
- C04B 2235/5264: characterised by the diameter of the fibers
- C04B 2235/72: Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
- D01D 5/18: by means of rotating spinnerets
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- D01D: MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS

## Abstract

The invention relates to inorganic fibers, and a process for their production. The inorganic fibers lose their fiber form factor after a short contact period with water or a physiological body fluid, so that danger to health is not expected from such fibers remaining for a prolonged period of time in or on human tissue. The fiber of the invention is characterized by the fact that at least 90% of it comprises 20-50% by weight of CaO and 50-80% by weight of Al.sub.2 O.sub.3. The rest comprises a maximum of 10% by weight of typical impurity oxides.

## Claims

### Claim 1

An inorganic fiber, at least 90% by weight of which comprises 20-50% by weight of CaO and 50-80% by weight of Al.sub.2 O.sub.3, and up to 10% by weight of which comprises impurities, based on the weight of the fiber, with the proviso that the fiber contain up to 1.5% by weight of SiO.sub.2.

### Claim 2 (depends on 1)

The inorganic fiber as claimed in claim 1, at least 95% by weight of which comprises 20-50% by weight of CaO and 50-80% by weight of Al.sub.2 O.sub.3.

### Claim 3 (depends on 1)

The inorganic fiber as claimed in claim 1, wherein at least 60% by weight of the fiber is X-ray amorphous.

### Claim 4 (depends on 1)

The inorganic fiber as claimed in claim 1, wherein the amount of SiO.sub.2 is up to 0.8% by weight based on the weight of the fiber.

### Claim 5 (depends on 1)

The inorganic fiber as claimed in claim 1, wherein the fiber has a diameter of 10 .mu.m or less.

### Claim 6 (depends on 5)

The inorganic fiber as claimed in claim 5, wherein the fiber has a diameter of 1-5 .mu.m.

### Claim 7 (depends on 1)

The inorganic fiber as claimed in claim 1, wherein the fiber has a length of greater than 20 .mu.m.

### Claim 8 (depends on 1)

A fibrous structure comprising the inorganic fiber of claim 1.

### Claim 9 (depends on 8)

The fibrous structure as claimed in claim 8, wherein the structure is a heat insulating fiber mat.

### Claim 10 (depends on 1)

A fiber molding which comprises the inorganic fiber of claim 1.

### Claim 11 (depends on 1)

A seal for a ceramic molding, wherein the seal comprises the inorganic fiber of claim 1.

### Claim 12 (depends on 1)

A joint filler for a ceramic molding, wherein the filler comprises the inorganic fiber of claim 1.

### Claim 13 (depends on 1)

A ceramic or metallic molding reinforced with the inorganic fiber of claim 1.