# US 5,332,698 A · Glass fibres with improved biological compatibility

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- Number: US 5,332,698 A
- Document ID: US5332698A
- Status: Granted
- Kind: A
- Application number: 08/100,640
- Filed: 1993-07-30
- Granted: 1994-07-26
- Earliest claimed: 1989-05-25
- Assignees: Bayer Aktiengesellschaft
- Inventors: Peter R. Nyssen; Wolfram Wagner; Geert Christoph
- Web page: https://patentgrep.com/patent/US5332698A

## CPC

- C03C 3/078: containing an oxide of a divalent metal, e.g. an oxide of zinc
- C03C 13/00: Fibre or filament compositions (manufacture of fibres or filaments C03B37/00)
- C03C 2213/02: Biodegradable glass fibres
- 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

## Abstract

Glass fibres which are distinguished by their greatly reduced carcinogenicity have an average fibre diameter of <8 .mu.m, preferably <3 .mu.m, with more than 10% of the fibres having a diameter of <3 .mu.m. The types of glass used for producing these fibres are characterized by containing the following compounds in the proportions shown in mol %: ______________________________________ SiO.sub.2 55-70 B.sub.2 O.sub.3 0-4 Al.sub.2 O.sub.3 0-1 TiO.sub.2 0-6 Iron oxides 0-2 MgO 0-5 CaO 12-20 Na.sub.2 O 10-20 K.sub.2 O 0-5 fluoride 0-2. ______________________________________

## Claims

### Claim 1

Glass fibres with improved biological compatibility, comprising fibres having a length of from 5.mu.to 150 .mu.m, an average diameter of .ltoreq.8 .mu.m and more than 10% of which have a diameter of .ltoreq.3 .mu.m, and wherein the glasses used for producing the fibres consist essentially of the following compounds in the proportions give in mol %:
______________________________________ SiO.sub.2 55-70 B.sub.2 O.sub.3 0-4 Al.sub.2 O.sub.3 0-1 TiO.sub.2 0-6 Iron oxides 0-2 MgO 0-5 CaO 12-20 Na.sub.2 O 10-20 K.sub.2 O 0-5 Fluoride 0-2 ______________________________________

### Claim 2 (depends on 1)

Glass fibres according to claim 1, wherein the fibres consist essentially of the following compounds in the proportions give in mol %:
______________________________________ SiO.sub.2 58-67 B.sub.2 O.sub.3 0-4 Al.sub.2 O.sub.3 0-1 TiO.sub.2 0-3 Iron oxides 0-1 MgO 1-4 CaO 12-20 Na.sub.2 O 12-18 K.sub.2 O 0.2-3 Fluoride 0-1 ______________________________________

### Claim 3 (depends on 1)

Glass fibres according to claim 1, wherein the fibres have an average diameter of .ltoreq.3 .mu.m.