Reinforcing glass yarns with low dielectric constants
OwnerSophie Creux, Emmanuel Lecomteinventors
Life of this patent
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Abstract
Glass reinforcement yarn, the composition of which comprises the following constituents, in the limits defined below, expressed as percentages by weight: 1 SiO2 50 to 60%, preferably SiO2 ≧ 52% and/or SiO2 ≦ 57% Al2O3 10 to 19%, preferably Al2O3 ≧ 13% and/or Al2O3 ≦ 17% B2O3 16 to 25% P2O5 0.5 to 4% Na2O ≦ 1.5%, preferably Na2O ≦ 0.8% K2O ≦ 1.5%, preferably K2O ≦ 0.8% R2O ≦ 2%, preferably R2O ≦ 1% CaO ≦ 10% MgO ≦ 10% F ≦ 0 to 2% RO 4 to 15%, preferably RO ≧ 6% and/or RO ≦ 10% Various ≦ 3%, where R2O = Na2O + K2O + Li2O, and RO = CaO + MgO. The dielectric properties of such glass compositions are particularly advantageous.
Claims10
A glass reinforcement yarn, the composition of which comprises the following constituents, in the limits defined below, expressed as percentages by weight:
- 6 SiO2 50 to 60%, preferably SiO2 ≧ 52% and/or SiO2 ≦ 57% Al2O3 10 to 19%, preferably Al2O3 ≧ 13% and/or Al2O3 ≦ 17% B2O3 16 to 25% P2O5 0.5 to 4% Na2O ≦1.5%, preferably Na2O ≦ 0.8% K2O ≦1.5%, preferably K2O ≦ 0.8% R2O ≦2%, preferably R2O ≦ 1% CaO ≦10% MgO ≦10% F ≦0 to 2% RO 4 to 15%, preferably RO ≧ 6% and/or RO ≦ 10% Various ≦3%, where R2O = Na2O + K2O + Li2O, and RO = CaO + MgO.
The glass yarn as claimed in one of the preceding claims, characterized in that the composition has a lime (CaO) content such that CaO≦8%, or even CaO≦6% and/or CaO≧2%, or even CaO≧4%.
The glass yarn as claimed in one of the preceding claims, characterized in that the composition has a magnesia (MgO) content such that MgO≦8%, or even MgO≦6% and/or MgO≧2%.
The glass yarn as claimed in one of the preceding claims, characterized in that the composition has a boron (B2O3) content such that B2O3≧18% and/or B2O3≦22%, or even B2O3≦20%.
A glass composition suitable for producing glass reinforcement yarns, comprising the following constituents, in the limits defined below, expressed as percentages by weight:
- 8 SiO2 50 to 60%, preferably SiO2 ≧ 52% and/or SiO2 ≦ 57% Al2O3 10 to 19%, preferably Al2O3 ≧ 13% and/or Al2O3 ≦ 17% B2O3 16 to 25% P2O5 0.5 to 4% Na2O ≦ 1.5%, preferably Na2O ≦ 0.8% K2O ≦ 1.5%, preferably K2O ≦ 0.8% R2O ≦ 2%, preferably R2O ≦ 1% CaO ≦ 10% MgO ≦ 10% F ≦ 0 to 2% RO 4 to 15%, preferably RO ≧ 6% and/or RO ≦ 10% Various ≦ 3%, where R2O = Na2O + K2O + Li2O, and RO = CaO + MgO.
Dependencies are inferred from the claim text.