Glass fibre for the reinforcement of organic and/or inorganic materials, method for production of said glass fibres and corresponding composition
View Patent ↗Glass reinforcement strand, the composition of which comprises the following constituents, within the limits defined below, expressed as percentages by weight: SiO 2 50 to 60%, preferably SiO 2 ≧ 52% and/or SiO 2 ≦ 57%; Al 2 O 3 10 to 19%, preferably Al 2 O 3 ≧ 13% and/or Al 2 O 3 ≦ 17%; B 2 O 3 16 to 25%; ZrO 2 0.5 to 1.5%; Na 2 O ≦1.5%, preferably Na 2 O ≦ 0.8%; K 2 O ≦1.5%, preferably K 2 O ≦ 0.8%; R 2 O ≦2%, preferably R 2 O ≦ 1%; CaO ≦10%; MgO ≦10%; F 0 to 2%; TiO 2 0 to 3%; RO 4 to 15%, preferably RO ≧ 6% and/or RO ≦ 10%; and Various ≦3%, where R 2 O = Na 2 O + K 2 O + Li 2 O, and RO = CaO + MgO. The dielectric properties of such glass compositions are particularly advantageous in the MHz and GHz ranges.
1. A glass reinforcement strand, comprising glass having the following composition in percentages by weight:
SiO 2
50 to 60%;
Al 2 O 3
10 to 19%;
B 2 O 3
16 to 25%;
ZrO 2
0.5 to 1.5%;
Na 2 O
≦1.5%;
K 2 O
≦1.5%;
R 2 O
≦2%
CaO
≦10%;
MgO
≦10%;
F
0 to 2%;
TiO 2
0 to 3%;
RO
4 to 15%; and
Various
≦3%,
where R 2 O = Na 2 O + K 2 O + Li 2 O and RO = CaO + MgO.
2. The glass reinforcement strand as claimed in claim 1 , wherein the composition comprises ZrO 2 in an amount such that ZrO 2 ≦1%.
3. The glass reinforcement strand as claimed in claim 1 , wherein the composition has comprises lime (CaO) in an amount such that CaO≦8%.
4. The glass reinforcement strand as claimed in claim 1 , wherein the composition comprises magnesia (MgO) in an amount such that MgO≦8%.
5. The glass reinforcement strand as claimed in claim 1 , wherein the composition comprises boron (B 2 O 3 ) in an amount such that B 2 O 3 ≦18%.
6. A composite, comprising:
at least one glass reinforcement strand as claimed in claim 1 ; and
organic materials, inorganic materials, or a combination thereof.
7. A printed-circuit substrate comprising at least one glass reinforcement strand as claimed in claim 1 .
8. A process for manufacturing the glass reinforcement strand of claim 1 , comprising:
drawing, from a multiplicity of molten glass streams, flowing out of a multiplicity of orifices located at the base of one or more bushings, at least one web of continuous filaments;
gathering the continuous filaments into at least one strand; and
collecting the at least one strand on a moving support to form the glass reinforcement strand.
9. The process as claimed in claim 8 , wherein the molten glass feeding the orifices of the one or more bushings comprises the following composition, expressed as percentages by weight:
SiO 2
50 to 60%;
Al 2 O 3
10 to 19%;
B 2 O 3
16 to 25%;
ZrO 2
0.5 to 1.5%;
Na 2 O
≦1.5%;
K 2 O
≦1.5%
R 2 O
≦2%;
CaO
≦10%;
MgO
≦10%;
F
0 to 2%;
TiO 2
0 to 3%;
RO
4 to 15%; and
Various
≦3%,
where R 2 O = Na 2 O + K 2 O + Li 2 O, and RO = CaO + MgO.
10. A glass composition suitable for producing glass reinforcement strands, comprising the following constituents, within the limits defined below, expressed as percentages by weight:
SiO 2
50 to 60%;
Al 2 O 3
10 to 19%;
B 2 O 3
16 to 25%;
ZrO 2
0.5 to 1.5%;
Na 2 O
≦1.5%;
K 2 O
≦1.5%;
R 2 O
≦2%;
CaO
≦10%;
MgO
≦10%;
F
0 to 2%;
TiO 2
0 to 3%;
RO
4 to 15%; and
Various
≦3%,
where R 2 O = Na 2 O + K 2 O + Li 2 O and
RO = CaG + MgO.