Classifications

• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • 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
  • C03C3/00—Glass compositions
  • C03C3/04—Glass compositions containing silica
  • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
  • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
  • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • 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
  • C03C12/00—Powdered glass; Bead compositions
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • 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
  • C03C13/00—Fibre or filament compositions
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • 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
  • C03C3/00—Glass compositions
  • C03C3/04—Glass compositions containing silica
  • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
  • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
  • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
  • C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • 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
  • C03C3/00—Glass compositions
  • C03C3/04—Glass compositions containing silica
  • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
  • C03C3/095—Glass compositions containing silica with 40% to 90% silica, by weight containing rare earths
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • 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
  • C03C3/00—Glass compositions
  • C03C3/04—Glass compositions containing silica
  • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
  • C03C3/11—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen
  • C03C3/112—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine
  • C03C3/115—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine containing boron
  • C03C3/118—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine containing boron containing aluminium
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • 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
  • C03C4/00—Compositions for glass with special properties
  • C03C4/16—Compositions for glass with special properties for dielectric glass

Definitions

• the present invention relates to a glass composition, glass fibers and glass fillers, and further to products such as molded bodies that contain glass fibers or glass fillers.
• Resin compositions are widely used in electronic devices to form electrical insulating and mechanical components.
• electrical insulating components include connector housings used in SMT (surface mount technology), FPCs (flexible printed circuits), board-to-board, CPU (central processing unit) sockets, memory cards, card edges, optical connectors, etc., LCD (liquid crystal display) backlights, coils, flats, transformers, reactance bobbins used in magnetic heads, etc., relay cases, relay base switches, reflow dip switches, switches used in tact switches, etc., sensor cases, capacitor casings, volume casings, trimmer casings.
• mechanical components are lens holders and pickup bases for optical pickups, insulators and terminals for micromotors, and drums for laser printers.
• Resin compositions are also used as films, such as base films for FPCs and base films for copper-clad laminates.
• a type of printed circuit board (printed circuit board) equipped in electronic devices also includes a substrate made of a resin composition. Some printed wiring boards, before electronic components are mounted on them, are also substrates made from resin compositions. In the rest of this specification, both printed circuit boards and printed wiring boards will be referred to as "printed boards.”
• the resin composition contains a thermoplastic resin and glass fibers, and may further contain a curing agent, a modifier, etc., as necessary.
• the printed circuit board may further contain an inorganic filler.
• As the inorganic filler glass filler may be used.
• Patent Document 1 discloses a glass composition with a low coefficient of linear thermal expansion and a high Young's modulus, and glass fibers composed of the glass composition.
• the glass composition disclosed in the examples of Patent Document 1 contains 0.7% to 3.0% by mass of titanium oxide ( TiO2 ) together with SiO2 , B2O3 , Al2O3 , MgO, etc., and the content of zirconium oxide (ZrO2) is limited to 0.6% or less.
• the glass composition disclosed in the examples of Patent Document 2 contains 4.0% to 7.5% by mass of zinc oxide (ZnO) together with SiO2, B2O3, Al2O3 , MgO , etc.
• Patent Document 2 does not disclose a glass composition containing zirconium oxide ( ZrO2 ).
• the object of the present invention is to provide a new glass composition that has a low coefficient of linear thermal expansion and a high Young's modulus, and is also suitable for mass production.
• the present invention is characterized by the following, expressed in mass %: 56 ⁇ SiO 2 ⁇ 70, 0.1 ⁇ B 2 O 3 ⁇ 8, 15 ⁇ Al 2 O 3 ⁇ 24, 4 ⁇ MgO ⁇ 14, 0 ⁇ CaO ⁇ 4, 0 ⁇ ZnO ⁇ 10, 0 ⁇ ( Li2O + Na2O + K2O ) ⁇ 4, 0.1 ⁇ ZrO 2 ⁇ 5, and a glass composition substantially free of TiO2 .
• composition comprising the following components, expressed in mass %: 56 ⁇ SiO 2 ⁇ 70, 0.1 ⁇ B 2 O 3 ⁇ 8, 15 ⁇ Al 2 O 3 ⁇ 24, 4 ⁇ MgO ⁇ 14, 0 ⁇ CaO ⁇ 4, 0.1 ⁇ ZnO ⁇ 3, 0 ⁇ ( Li2O + Na2O + K2O ) ⁇ 4, and a glass composition substantially free of TiO 2 and ZrO 2 .
• a composition comprising the following components, expressed in mass %: 56 ⁇ SiO 2 ⁇ 70, 0.1 ⁇ B 2 O 3 ⁇ 8, 15 ⁇ Al 2 O 3 ⁇ 24, 4 ⁇ MgO ⁇ 14, 0 ⁇ CaO ⁇ 4, 0 ⁇ ZnO ⁇ 10, 0 ⁇ ( Li2O + Na2O + K2O ) ⁇ 4, 1 ⁇ ZrO2 ⁇ 5,
• the present invention provides a glass composition comprising the components:
• the present invention can also be described as follows.
• the present invention is characterized by the following, expressed in mass %: 56 ⁇ SiO 2 ⁇ 70, 0.1 ⁇ B 2 O 3 ⁇ 8, 15 ⁇ Al 2 O 3 ⁇ 24, 4 ⁇ MgO ⁇ 14, 0 ⁇ CaO ⁇ 4, Contains a component satisfying the formula: 0 ⁇ (Li 2 O + Na 2 O + K 2 O) ⁇ 4,
• the present invention provides a glass composition, wherein at least one selected from the group consisting of a) and c) or b) is satisfied. a) further containing the components 0 ⁇ ZnO ⁇ 10 and 0.1 ⁇ ZrO2 ⁇ 5; Substantially free of TiO2 . b) further containing a component of 0.1 ⁇ ZnO ⁇ 3; It is substantially free of TiO2 and ZrO2 . c) It further contains the components 0 ⁇ ZnO ⁇ 10, and 1 ⁇ ZrO 2 ⁇ 5.
• the present invention provides a new glass composition that has a low linear thermal expansion coefficient and a high Young's modulus and is suitable for mass production.
• substantially not contained and “substantially not contained” mean that the content is less than 0.1 mass%, less than 0.05 mass%, less than 0.01 mass%, further less than 0.005 mass%, particularly less than 0.003 mass%, and in some cases less than 0.001 mass%.
• “Substantially” is intended to allow the inclusion of trace amounts of impurities derived from glass raw materials, manufacturing equipment, molding equipment, etc.
• Mainn component means the component with the largest content by mass.
• T-Fe 2 O 3 means the total iron oxide converted into iron trioxide (Fe 2 O 3 ).
• T-SnO 2 means the total tin oxide converted into tin dioxide (SnO 2 ).
• Alkali metal oxide means lithium oxide (Li 2 O), sodium oxide (Na 2 O), and potassium oxide (K 2 O). The upper and lower limits of the contents described below can be combined in any combination.
• the glass composition may be simply referred to as glass, and the linear thermal expansion coefficient may be simply referred to as the linear expansion coefficient.
• SiO 2 is a component that forms the skeleton of glass and is the main component of the glass composition.
• SiO 2 is a component that adjusts the devitrification temperature and viscosity during glass formation and improves the water resistance of glass.
• SiO 2 is a component that lowers the linear expansion coefficient of glass.
• SiO 2 is a component that has the effect of lowering the dielectric constant and dielectric tangent.
• the content of SiO 2 is 56% by mass or more and 70% by mass or less.
• the lower limit of the content of SiO 2 can be 57% by mass or more, 58% by mass or more, 58.5% by mass or more, 59% by mass or more, 59.5% by mass or more, 60% by mass or more, or even 60.1% by mass or more.
• the upper limit of the SiO2 content can be 68% by mass or less, 66% by mass or less, 65% by mass or less, 64% by mass or less, 63.5% by mass or less, 63% by mass or less, 62.5% by mass or less, 62% by mass or less, or even 61.9% by mass or less, and in some cases 61.8% by mass or less.
• B 2 O 3 is a component that forms the skeleton of glass.
• B 2 O 3 is also a component that adjusts the devitrification temperature and viscosity during glass formation.
• excessive B 2 O 3 content reduces the Young's modulus of glass and increases the linear expansion coefficient of glass.
• B 2 O 3 is a component that has the effect of lowering the dielectric constant and dielectric tangent.
• the content of B 2 O 3 is 0.1% by mass or more and 8% by mass or less.
• the lower limit of the content of B 2 O 3 is 0.5% by mass or more, 1% by mass or more, 1.5% by mass or more, 2% by mass or more, 2.5% by mass or more, 2.6% by mass or more, 2.7% by mass or more, 2.8% by mass or more, 2.9% by mass or more, 3% by mass or more, 3.1% by mass or more, 3.2% by mass or more, 3.3% by mass or more, 3.4% by mass or more, and in some cases, 3.5% by mass or more.
• the upper limit of the B2O3 content may be 7 mass% or less, 6 mass% or less, further 5.8 mass% or less, 5.5 mass% or less, 5 mass% or less, 4.5 mass% or less, 4.4 mass% or less, 4.3 mass% or less, 4.2 mass% or less, 4.1 mass% or less, 4.0 mass% or less, 3.9 mass% or less, and in some cases 3.5 mass% or less.
• the B2O3 content may be 0.1 mass% or more and 6 mass% or less.
• Al 2O3 is a component that forms the skeleton of glass.
• Al 2 O 3 is also a component that adjusts the devitrification temperature and viscosity during glass formation.
• Al 2 O 3 is a component that improves the Young's modulus of glass and also a component that reduces the linear expansion coefficient of glass.
• Al 2 O 3 is a component that adjusts the dielectric constant and dielectric loss tangent of glass.
• the lower limit of the content of Al 2 O 3 can be 16 mass% or more, 17 mass% or more, 18 mass% or more, 18.5 mass% or more, 19 mass% or more, 19.5 mass% or more, 20 mass% or more, 20.1 mass% or more, or even 20.5 mass% or more.
• the upper limit of the Al2O3 content can be 23.5% by mass or less, 23% by mass or less, 22.5% by mass or less, 22% by mass or less, further 21.8% by mass or less, 21.5% by mass or less, and in some cases 21% by mass or less, 20.9% by mass or less, 20.8% by mass or less, 20.7% by mass or less, 20.6% by mass or less, or 20.5% by mass or less.
• MgO is a component that adjusts the devitrification temperature and viscosity during glass formation, and is also a component that improves the Young's modulus of glass. MgO is also a component that adjusts the dielectric constant and dielectric tangent of glass.
• the content of MgO is 4% by mass or more and 14% by mass or less.
• the lower limit of the content of MgO can be 5% by mass or more, 6% by mass or more, 6.5% by mass or more, 7% by mass or more, 7.5% by mass or more, 8% by mass or more, 8.5% by mass or more, or even 9% by mass or more.
• the upper limit of the content of MgO can be 13% by mass or less, 12% by mass or less, 11% by mass or less, 10% by mass or less, 9.5% by mass or less, 9% by mass or less, 8.5% by mass or less, or in some cases 8% by mass or less.
• CaO CaO is an optional component. CaO is a component that adjusts the devitrification temperature and viscosity during glass formation. On the other hand, excessive inclusion of CaO reduces the Young's modulus of glass and increases the linear expansion coefficient of glass.
• the lower limit of the CaO content can be 0.05 mass% or more, 0.06 mass% or more, 0.07 mass% or more, 0.08 mass% or more, 0.09 mass% or more, or 0.1 mass% or more.
• the upper limit of the CaO content can be 4 mass% or less, 3 mass% or less, 2 mass% or less, 1.5 mass% or less, 1 mass% or less, 0.8 mass% or less, 0.6 mass% or less, 0.5 mass% or less, 0.4 mass% or less, 0.3 mass% or less, 0.2 mass% or less, or even 0.15 mass% or less. CaO may not be substantially contained.
• the upper limit of (MgO+CaO) may be 14 mass% or less, 13 mass% or less, 12 mass% or less, 11 mass% or less, 10 mass% or less, 9.5 mass% or less, 9 mass% or less, and in some cases, 8.5 mass% or less, or even 8 mass% or less.
• the ratio of the MgO content to the CaO content may also be important in adjusting the devitrification temperature and viscosity during glass formation, as well as the Young's modulus and linear expansion coefficient of the glass.
• the content is based on mass.
• the lower limit of (MgO/CaO) may be 30 or more, 50 or more, 80 or more, 90 or more, or even 95 or more, and in some cases 100 or more.
• the upper limit of (MgO/CaO) is not particularly limited, but may be 10,000 or less, 1,000 or less, or even 500 or less.
• SrO is an optional component.
• SrO is a component that adjusts the devitrification temperature and viscosity during glass formation.
• excessive SrO content reduces the Young's modulus of glass and increases the linear expansion coefficient of glass.
• the upper limit of the SrO content can be 5 mass% or less, 4 mass% or less, 3 mass% or less, 2 mass% or less, 1 mass% or less, 0.5 mass% or less, or even 0.1 mass% or less. SrO may not be substantially contained.
• BaO is also an optional component.
• BaO is a component that adjusts the devitrification temperature and viscosity during glass formation.
• excessive inclusion of BaO reduces the Young's modulus of glass and increases the linear expansion coefficient of glass.
• the upper limit of the BaO content can be 5 mass% or less, 4 mass% or less, 3 mass% or less, 2 mass% or less, 1 mass% or less, 0.5 mass% or less, or even 0.1 mass% or less. BaO may not be substantially contained.
• the total content of MgO, CaO, SrO and BaO (MgO+CaO+SrO+BaO) may be important.
• the lower limit of (MgO+CaO+SrO+BaO) can be 4 mass% or more, 5 mass% or more, 6 mass% or more, 7 mass% or more, 8 mass% or more, 8.5 mass% or more, or even 9 mass% or more.
• the upper limit of (MgO+CaO+SrO+BaO) is 14 mass% or less, 13 mass% or less, 12 mass% or less, 11 mass% or less, 10 mass% or less, 9.5 mass% or less, 9 mass% or less, or in some cases 8 mass% or less. It may be 0.5% by weight or less, or even 8% by weight or less.
• ZnO, ZrO 2 are components that adjust the devitrification temperature and viscosity during glass formation.
• ZnO and ZrO2 are components that improve the Young's modulus of glass and also components that lower the linear expansion coefficient of glass.
• ZnO and ZrO2 are components that adjust the dielectric constant and dielectric loss tangent of the glass.
• the sum of the contents of ZnO and ZrO2 (ZnO + ZrO2 ) is a value that can be used to improve the melting temperature while suppressing an increase in the devitrification temperature.
• the content can be adjusted to a range of 0.1 mass % or more and 15 mass % or less. This range is favorable for achieving a low linear expansion coefficient and a high Young's modulus. This is also preferable from the viewpoint of securing the required space.
• the lower limit of (ZnO+ ZrO2 ) is 0.5 mass% or more, 1 mass% or more, 1.1 mass% or more, 1.3 mass% or more, further 1.5 mass% or more, and in some cases 2 mass% or more.
• the upper limit of (ZnO+ZrO 2 ) is 14% by mass or less, 13% by mass or less, 12% by mass or less, 11% by mass or less, 10% by mass or less, or 15% by mass or less. Less than 5.8% by mass, 9% by mass or less, 8% by mass or less, 7.5% by mass or less, 7% by mass or less, further 6.5% by mass or less, 6% by mass or less, 5.8% by mass or less, 5.5% by mass or less %, or 5% by weight or less, and in some cases 4.5% by weight or less, 4% by weight or less, 3.5% by weight or less, 3% by weight or less, 2.5% by weight or less, or even 2% by weight or less.
• Each of ZnO and ZrO2 is an optional component. In other words, the lower limit of the content of each of these components may be 0. (ZnO+ZrO 2 ) may be 0.1 mass % or more and 8 mass % or less.
• the lower limit of the ZnO content may be 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, 1.1% by mass or more, 1.3% by mass or more, 1.5% by mass or more, 2% by mass or more, 2.1% by mass or more, 2.5% by mass or more, 3% by mass or more, or even 3.5% by mass or more.
• the upper limit of the ZnO content may be 10% by mass or less, 9% by mass or less, 8% by mass or less, 7.5% by mass or less, 7% by mass or less, 6.5% by mass or less, 6% by mass or less, 5.5% by mass or less, 5.3% by mass or less, 5.2% by mass or less, 5.1% by mass or less, 5% by mass or less, 4.5% by mass or less, 4% by mass or less, 3.5% by mass or less, 3% by mass or less, 2.9% by mass or less, 2.8% by mass or less, 2.7% by mass or less, 2.5% by mass or less, or even 2% by mass or less.
• ZnO does not necessarily have to be substantially present.
• the lower limit of the content of ZrO2 may be 0.1% by mass or more, 0.15% by mass or more, 0.2% by mass or more, 0.25% by mass or more, 0.3% by mass or more, 0.35% by mass or more, 0.4% by mass or more, 0.45% by mass or more, or even 0.5% by mass or more.
• the upper limit of the content of ZrO2 may be 5% by mass or less, 4% by mass or less, 3% by mass or less, 2% by mass or less, 1.5% by mass or less, 1.4% by mass or less, 1.2% by mass or less, or even 1% by mass or less.
• the content of ZrO2 may be 1% by mass or less, 0.8% by mass or less, 0.7% by mass or less, or even 0.6% by mass or less.
• the content of ZrO2 may be 1% by mass or more, 1.1% by mass or more, or even 1.2% by mass or more, or may be 5% by mass or less.
• ZrO 2 may not be substantially contained.
• the content of ZrO 2 suitable for achieving a low dielectric tangent is 0.7 mass % or more, and further 0.8 mass % or more.
• B2O3 + ZnO+ ZrO2 The total content of B2O3 , ZnO and ZrO2 ( B2O3 + ZnO + ZrO2 ) may be important in adjusting various properties.
• the adjustment is effective in controlling the devitrification temperature and viscosity of the glass melt within a range suitable for glass production while suppressing an excessive increase in the devitrification temperature . , 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, 1.5% by mass or more, 2% by mass or more, 2.5% by mass or more, 3% by mass or more, 3.5% by mass or more , 4% by weight or more, further 4.5% by weight or more, and in some cases 5% by weight or more.
• the upper limit of ( B2O3 +ZnO+ ZrO2 ) is 18 mass% or less, 16 mass% or less, 15 mass % or less, 14 mass% or less, 13 mass% or less, 12 mass% or less, 11 mass% or less, 10 mass% It may be 9% by mass or less, 8% by mass or less, 7% by mass or less, or even 6% by mass or less.
• (MgO+ZnO) The value of the sum of the contents of MgO and ZnO (MgO+ZnO) may also be important in adjusting various properties. Appropriate adjustment of (MgO+ZnO) is effective in controlling the devitrification temperature and viscosity of the molten glass to a range suitable for glass production while suppressing an excessive increase in the devitrification temperature.
• the lower limit of (MgO+ZnO) may be 4 mass% or more, 5 mass% or more, 6 mass% or more, 7 mass% or more, 8 mass% or more, or even 9 mass% or more, and in some cases 10 mass% or more.
• the upper limit of (MgO+ZnO) may be 17 mass% or less, 16.5 mass% or less, 16 mass% or less, 15.5 mass% or less, 15 mass% or less, 14.5 mass% or less, 14 mass% or less, 13.8 mass% or less, or even 13.7 mass% or less.
• the alkali metal oxides ( Li2O , Na2O , K2O ) are components that adjust the devitrification temperature and viscosity during glass formation.
• the total content of the alkali metal oxides ( Li2O + Na2O +K2O) is When the value of .DELTA..sup.2O ) is from 0 mass % to 4 mass %, the devitrification temperature and viscosity of the molten glass can be set within ranges suitable for glass production while suppressing an excessive increase in the devitrification temperature.
• the lower limit of the amount of O may be 0.1% by mass or more, 0.15% by mass or more, 0.2% by mass or more, 0.25% by mass or more, or even 0.3% by mass or more. The addition of these materials is effective in reducing bubbles in the glass.
• the upper limit of (Li 2 O + Na 2 O + K 2 O) is 3 mass % or less, 2 mass % or less, less than 2 mass %, 1.5 mass % or less, 1 mass % or less, less than 1 mass %, 0.9 mass %
• the alkali metal oxide may be 0.8% by mass or less, 0.7% by mass or less, 0.6% by mass or less, 0.5% by mass or less, 0.4% by mass or less, or 0.3% by mass or less.
• Li 2 O, Na 2 O, and K 2 O are optional components. In other words, the lower limit of the content of each of these components may be 0 or less. good.
• the lower limit of the Li2O content may be 0.1% by mass or more, or even 0.2% by mass or more.
• the upper limit of the Li2O content may be 4% by mass or less, 3% by mass or less, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, less than 1% by mass, 0.9% by mass or less, 0.8% by mass or less, 0.7% by mass or less, 0.6% by mass or less, 0.5% by mass or less, 0.4% by mass or less, 0.3% by mass or less, or even 0.2% by mass or less.
• Li2O may not be substantially contained.
• the upper and lower limits of the content of Na 2 O and K 2 O may be the values stated as the upper and lower limits of the content of Li 2 O, respectively.
• the sum of the content of Na 2 O and K 2 O (Na 2 O + K 2 O) may be 4 mass% or less, 3 mass% or less, 2 mass% or less, less than 2 mass%, 1.5 mass% or less, 1 mass% or less, less than 1 mass%, 0.9 mass% or less, 0.8 mass% or less, 0.7 mass% or less, 0.6 mass% or less, 0.5 mass% or less, 0.4 mass% or less, 0.3 mass% or less, 0.2 mass% or less, or even 0.15 mass% or less, and in some cases 0.1 mass% or less.
• the lower limit of the content of (Na 2 O + K 2 O) may be 0.1 mass% or more, or even 0.2 mass% or more. Na 2 O may not be substantially contained. It is also not necessary for the composition to substantially contain K 2 O.
• TiO2 is a component that adjusts the devitrification temperature and viscosity during glass formation.
• TiO2 is a component that improves the Young's modulus of glass and also reduces the linear expansion coefficient of glass.
• TiO2 is a component that improves the meltability and chemical durability of glass and improves the ultraviolet absorption characteristics of glass.
• the lower limit of the content of TiO2 may be 0.1 mass% or more, 0.2 mass% or more, 0.3 mass% or more, 0.5 mass% or more, 1 mass% or more, or in some cases 1.2 mass% or more.
• TiO2 in excess.
• the upper limit of the TiO2 content may be 5% by mass or less, 4% by mass or less, 3% by mass or less, 2% by mass or less, 1.5% by mass or less, 1.4% by mass or less, 1.3% by mass or less, 1% by mass or less, 0.5% by mass or less, 0.4% by mass or less, 0.3% by mass or less, 0.2% by mass or less, or even 0.1% by mass or less.
• TiO2 may not be substantially contained.
• TiO 2 +ZrO 2 The sum of the contents of TiO 2 and ZrO 2 (TiO 2 +ZrO 2 ) may also be important in adjusting the devitrification temperature and viscosity during glass formation, as well as the Young's modulus and linear expansion coefficient of the glass.
• the lower limit of (TiO 2 +ZrO 2 ) is 0.1 mass % or more, 0.2 mass % or more, 0.3 mass % or more, further 0.4 mass % or more, and in some cases 0.5 mass % or more.
• TiO 2 +ZrO 2 The upper limit of (TiO 2 +ZrO 2 ) is 5 mass % or less, 4 mass % or less, 3.5 mass % or less, 3.3 mass % or less, 3 mass % or less, 2.5 mass % or less, and in some cases may be 2% by weight or less, 1.5% by weight or less, 1.2% by weight or less, 1% by weight or less, 0.7% by weight or less, or even 0.6% by weight or less. Both TiO 2 and ZrO 2 may be substantially absent.
• Fe In glass, Fe is usually present in the form of Fe2 + or Fe3 + .
• Fe3+ is a component that enhances the ultraviolet ray absorption properties of glass
• Fe2 + is a component that enhances the heat ray absorption properties of glass.
• the upper limit of the Fe content may be 5 mass% or less, 4 mass% or less, 3 mass% or less, 2 mass% or less, 1 mass% or less, 0.5 mass% or less, 0.4 mass% or less, or even 0.3 mass% or less, expressed by T- Fe2O3 .
• the lower limit of the Fe content may be 0.1 mass% or more, 0.15 mass% or more, or even 0.2 mass% or more, expressed by T - Fe2O3.
• a small amount of iron oxide can promote fining of the glass and contribute to reducing bubbles. Fe may not be substantially contained.
• CeO2 , SnO2 CeO2 and SnO2 are optional components.
• trace amounts of CeO2 and SnO2 may contribute to promoting fining of the glass.
• CeO2 and SnO2 is a component that adjusts the devitrification temperature and viscosity during glass formation.
• CeO2 and SnO2 are components that improve the Young's modulus of glass and also components that lower the linear expansion coefficient of glass.
• CeO The upper limits of the CeO2 and SnO2 contents may be 0.1% by mass or more. The upper limits of the CeO2 and SnO2 contents are 2% by mass or less, 1% by mass or less, and 0.5% by mass or less, respectively. % by mass or less, 0.3% by mass or less, or even 0.2% by mass or less.
• CeO2 may be substantially absent.
• SnO2 may also be substantially absent.
• the SnO2 content is a value expressed by T- SnO2 .
• ( SO3 ) SO 3 is also an optional component.
• a small amount of SO 3 can reduce bubbles remaining in the glass and contribute to improving the mass production suitability of the glass.
• the lower limit of the content of SO 3 may be 0.001 mass% or more, and even 0.002 mass% or more.
• the upper limit of the content of SO 3 may be 0.5 mass% or less, 0.2 mass% or less, 0.1 mass% or less, 0.05 mass% or less, 0.04 mass% or less, 0.03 mass% or less, 0.02 mass% or less, and even 0.01 mass% or less. SO 3 may not be substantially contained.
• F2 , Cl2 Fluorine (F 2 ) and chlorine (Cl 2 ) are also optional components.
• F 2 and Cl 2 can contribute to promoting clarification of the glass.
• F 2 and Cl 2 are easily volatile and may scatter during melting.
• the upper limits of the contents of F 2 and Cl 2 may be 5 mass% or less, 4 mass% or less, 3 mass% or less, 2 mass% or less, 1 mass% or less, 0.5 mass% or less, 0.2 mass% or less, or even 0.1 mass% or less, respectively.
• F 2 may not be substantially contained.
• the lower limit of the content of F 2 may be 0.1 mass% or more, 0.2 mass% or more, 0.3 mass% or more, 0.35 mass% or more, or even 0.4 mass% or more.
• Cl 2 may not be substantially contained either.
• the total of the above-mentioned components may be 95% by mass or more, 97% by mass or more, further 99% by mass or more, and in some cases 99.5 % by mass or more.
• the lower limit of the total content of each component represented by ( SiO2 + B2O3 + Al2O3 + MgO + CaO + ZnO ) may be 75% by mass or more, 85% by mass or less, 90% by mass or more, further 95% by mass or more, and in some cases 97% by mass or more.
• the upper limit of the total content of each component represented by (SiO2 + B2O3 + Al2O3 + MgO + CaO + ZnO ) may be 99% by mass or less.
• the lower limit of the total of the components represented by ( Li2O + Na2O + K2O + TiO2 + ZrO2 +T- Fe2O3 ) may be 0.5 mass% or more, 0.7 mass% or more, or even 1 mass% or more.
• the upper limit of the total of the components represented by ( Li2O + Na2O + K2O + TiO2 + ZrO2 +T- Fe2O3 ) may be 19 mass% or less, 10 mass% or less, 5 mass% or less, or even 3 mass% or less.
• Other optional components include P2O5 , HfO2 , Ga2O3 , La2O3 , Pr2O3 , Nd2O3 , Pm2O3 , Sm2O3 , Eu2O3 , Gd2O3 , Tb2O3 , Dy2O3 , Ho2O3 , Er2O3 , Tm2O3 , Yb2O3 , Lu2O3 , WO3 , Nb2O5 , Sc2O3 , Y2O3 , MoO3 , Ta2O5 , MnO2 , and Cr2O3 .
• the other optional components are not limited to these .
• the other optional components may each be contained at a content of 3 mass% or less.
• the allowable content of the other optional components may be 2 mass% or less, less than 2 mass%, less than 1 mass%, less than 0.5 mass%, or even 0.1 mass% or less.
• the other optional components may not be substantially contained.
• Y2O3 and La2O3 are components that adjust the devitrification temperature and viscosity during glass formation .
• Y2O3 and La2O3 are components that improve the Young 's modulus of glass.
• the sum of the contents of Y2O3 and La2O3 may be 5% by mass or less, less than 3% by mass, less than 2% by mass, less than 1% by mass, 0.9% by mass or less, less than 0.5% by mass, or even 0.1 % by mass or less.
• As2O3 and Sb2O3 are not substantially contained from the viewpoint of environmental protection.
• the total content of the other optional components listed above may be 5% by mass or less, less than 3 % by mass, less than 2% by mass, less than 1% by mass, less than 0.5% by mass, or even 0.1% by mass or less.
• composition A preferred composition is shown below. The ranges shown in parentheses for each component are more preferred ranges.
• Composition A1 Expressed in mass %, 58 ⁇ SiO 2 ⁇ 64 (58.5 ⁇ SiO 2 ⁇ 63), 1 ⁇ B 2 O 3 ⁇ 6 (1.5 ⁇ B 2 O 3 ⁇ 5), 17 ⁇ Al 2 O 3 ⁇ 23 (18 ⁇ Al 2 O 3 ⁇ 22), 4 ⁇ MgO ⁇ 13 (7 ⁇ MgO ⁇ 12), 0 ⁇ CaO ⁇ 3 (0 ⁇ CaO ⁇ 1), 1 ⁇ ZnO ⁇ 8 (1.1 ⁇ ZnO ⁇ 7), 0 ⁇ ( Li2O + Na2O + K2O ) ⁇ 3(0 ⁇ ( Li2O + Na2O + K2O ) ⁇ 2), 0.2 ⁇ ZrO 2 ⁇ 4 (0.3 ⁇ ZrO 2 ⁇ 3), A glass composition comprising the components and substantially free of TiO2 .
• Composition A1 has a low linear thermal expansion coefficient and a high Young's modulus, and is also excellent in suitability for mass production.
• One example of excellent suitability for mass production is when ⁇ T, calculated by subtracting the devitrification temperature from the working temperature, is a positive value.
• composition A2 Expressed in mass %, 58.5 ⁇ SiO 2 ⁇ 62 1.5 ⁇ B 2 O 3 ⁇ 5, 18 ⁇ Al 2 O 3 ⁇ 22, 7 ⁇ MgO ⁇ 12, 0 ⁇ CaO ⁇ 1, 1.1 ⁇ ZnO ⁇ 7, 0.1 ⁇ ( Li2O + Na2O + K2O ) ⁇ 2, 0.3 ⁇ ZrO 2 ⁇ 3,
• the glass composition contains the components above, satisfies 9 ⁇ (MgO+ZnO) ⁇ 13.8, and is substantially free of TiO 2 .
• Composition A2 has a low linear thermal expansion coefficient and a high Young's modulus, and is also excellent in suitability for mass production.
• An example of excellent suitability for mass production is a low operating temperature and a large ⁇ T.
• a low operating temperature is, for example, 1395°C or lower
• a large ⁇ T is, for example, 10°C or higher.
• composition B Expressed in mass %, 58 ⁇ SiO 2 ⁇ 64 (58.5 ⁇ SiO 2 ⁇ 63), 1 ⁇ B 2 O 3 ⁇ 6 (1.5 ⁇ B 2 O 3 ⁇ 5), 17 ⁇ Al 2 O 3 ⁇ 23 (18 ⁇ Al 2 O 3 ⁇ 22), 4 ⁇ MgO ⁇ 13 (7 ⁇ MgO ⁇ 12), 0 ⁇ CaO ⁇ 3 (0 ⁇ CaO ⁇ 1), 0.5 ⁇ ZnO ⁇ 2.8 (1.1 ⁇ ZnO ⁇ 2.8), 0 ⁇ ( Li2O + Na2O + K2O ) ⁇ 3(0 ⁇ ( Li2O + Na2O + K2O ) ⁇ 2), A glass composition comprising the components above and substantially free of TiO 2 and ZrO 2 .
• Composition B is substantially free of ZrO 2 , unlike compositions A1-A2 and C.
• Composition B has a low linear thermal expansion coefficient and a high Young's modulus, and is also excellent in suitability for mass production.
• composition C (Composition C) Expressed in mass %, 58 ⁇ SiO 2 ⁇ 64 (58.5 ⁇ SiO 2 ⁇ 63), 1 ⁇ B 2 O 3 ⁇ 6 (1.5 ⁇ B 2 O 3 ⁇ 5), 17 ⁇ Al 2 O 3 ⁇ 23 (18 ⁇ Al 2 O 3 ⁇ 22), 4 ⁇ MgO ⁇ 13 (7 ⁇ MgO ⁇ 12), 0 ⁇ CaO ⁇ 3 (0 ⁇ CaO ⁇ 1), 1 ⁇ ZnO ⁇ 8 (1.1 ⁇ ZnO ⁇ 7), 0 ⁇ ( Li2O + Na2O + K2O ) ⁇ 3(0 ⁇ ( Li2O + Na2O + K2O ) ⁇ 2), 0.1 ⁇ TiO2 ⁇ 4 (0.3 ⁇ TiO2 ⁇ 3), 1.1 ⁇ ZrO 2 ⁇ 4 (1.1 ⁇ ZrO 2 ⁇ 3), A glass composition comprising the components:
• Composition C unlike compositions A1-A2 and B, contains both TiO2 and ZrO2 .
• Composition C has a low linear thermal expansion coefficient and a high Young's modulus, and is also excellent in mass production suitability.
• Composition C is also suitable for achieving a low dielectric tangent.
• compositions A1, A2, B and C may further contain 0.1 ⁇ T- Fe2O3 ⁇ 3 (more preferably 0.1 ⁇ T- Fe2O3 ⁇ 2), and may further contain 0.001 ⁇ SO3 ⁇ 0.5 (more preferably 0.002 ⁇ SO3 ⁇ 0.3) together with T - Fe2O3 in this range. Furthermore, the compositions A1, A2, B and C may change the upper and/or lower limits of the content of each component, as described in the ⁇ Components> section. Furthermore, the compositions A1, A2, B and C may have the total of the components adjusted, or may contain other components, as described in the ⁇ Components> section.
• the temperature at which the viscosity of the molten glass is 1000 dPa ⁇ sec (1000 poise) is called the working temperature of the glass, and is a temperature suitable for forming the glass. If the working temperature of the glass is 1100°C or higher, the variation in dimensions such as the diameter of the glass fiber can be reduced. If the working temperature is 1450°C or lower, the fuel cost for melting the glass can be reduced, the glass manufacturing equipment is less susceptible to corrosion due to heat, and the equipment life can be extended.
• the lower limit of the working temperature can be 1200°C or higher, 1300°C or higher, 1320°C or higher, 1330°C or higher, 1340°C or higher, or even 1350°C or higher.
• the upper limit of the working temperature can be 1420°C or lower, 1410°C or lower, 1400°C or lower, 1395°C or lower, 1390°C or lower, 1385°C or lower, 1382°C or lower, or even 1380°C or lower.
• ⁇ T can be 0°C or higher, 5°C or higher, 10°C or higher, or even 15°C or higher. There is no particular upper limit for ⁇ T, but it can be, for example, 100°C or lower, 80°C or lower, 70°C or lower, 65°C or lower, 60°C or lower, 55°C or lower, or even 50°C or lower.
• the devitrification temperature is the temperature at which crystals form in the molten glass base and begin to grow, and can be measured by the method described below.
• the linear expansion coefficient is, to be precise, the average linear expansion coefficient at 50 to 350°C.
• the low linear expansion coefficient of glass contributes to improving the dimensional stability of a resin composition containing glass.
• the lower limit of the linear expansion coefficient can be 20 x 10 -7 /°C or more, 25 x 10 -7 /°C or more, 26 x 10 -7 /°C or more, or even 27 x 10 -7 /°C or more.
• the upper limit of the linear expansion coefficient can be 35 x 10 -7 / °C or less, 34 x 10 -7 /°C or less, 33 x 10 -7 /°C or less, or even 32 x 10 -7 /°C or less, and in some cases 31 x 10 -7 /°C or less.
• the glass transition temperature (glass transition point) is an index of the heat resistance of glass. When a resin composition containing glass is subjected to heat treatment, a high glass transition temperature is desired.
• the lower limit of the glass transition temperature can be 650°C or more, 700°C or more, 710°C or more, 720°C or more, or even 730°C or more.
• the upper limit of the glass transition temperature can be 800°C or less, 790°C or less, 780°C or less, or even 770°C or less.
• the high Young's modulus of glass contributes to improving the mechanical properties and dimensional stability of the resin composition containing glass fiber or glass filler.
• the Young's modulus can be calculated from the longitudinal wave velocity and transverse wave velocity of the elastic wave propagating through the glass measured by a normal ultrasonic method and the density of the glass measured by the Archimedes method.
• the lower limit of the Young's modulus can be 85 GPa or more, 86 GPa or more, 87 GPa or more, 88 GPa or more, 89 GPa or more, or even 90 GPa or more.
• the upper limit of the Young's modulus can be 100 GPa or less, 99 GPa or less, 98 GPa or less, 97 GPa or less, 96 GPa or less, or even 95 GPa or less.
• the low dielectric constant of glass contributes to improving the dielectric properties of the resin composition containing glass fiber or glass filler.
• the dielectric constant at a measurement frequency of 1 GHz is 6.5 or less, 6.4 or less, 6.3 or less, 6.2 or less, 6.1 or less, 6.0 or less, 5.9 or less, 5.8 or less, 5.7 or less, 5.6 or less, 5.5 or less, or even 5.4 or less, and in some cases 5.3 or less.
• the dielectric constant means the relative dielectric constant, but in this specification, it is simply referred to as the dielectric constant according to convention.
• the dielectric constant is a value at room temperature (25°C).
• the dielectric constant may be 5.0 or more.
• the low dielectric tangent of glass also contributes to improving the dielectric properties of resin compositions containing glass fibers or glass fillers.
• the dielectric tangent at a measurement frequency of 1 GHz is 0.0060 or less, 0.0055 or less, 0.0050 or less, 0.0045 or less, 0.0044 or less, 0.0043 or less, 0.0042 or less, 0.0041 or less, 0.0040 or less, 0.0039 or less, 0.0038 or less, 0.0037 or less, 0.0036 or less, 0.0035 or less, 0.0034 or less, 0.0033 or less, 0.0032 or less, It is 0.0031 or less, 0.0030 or less, further 0.0029 or less, 0.0028 or less, 0.0027 or less, 0.0026 or less, 0.0025 or less, 0.0024 or less, 0.0023 or less, 0.0022 or less, 0.0021 or less, 0.0020 or less, and in some cases 0.0019 or less, 0.0018 or less, 0.0017 or less, 0.0016 or less
• the glass fiber of the present embodiment is composed of the above-mentioned glass composition. According to the present embodiment, even when the fiber diameter is small, the occurrence of devitrification and the inclusion of bubbles in the glass fiber can be further suppressed, so that the glass fiber of the present embodiment can be a glass fiber having a small fiber diameter.
• the average fiber diameter of the glass fibers is, for example, 0.1 to 50 ⁇ m.
• the average fiber diameter may be 0.1 ⁇ m or more, 0.2 ⁇ m or more, 0.3 ⁇ m or more, 0.4 ⁇ m or more, 0.5 ⁇ m or more, 1 ⁇ m or more, 2 ⁇ m or more, or even 3 ⁇ m or more, and may be 50 ⁇ m or less, 40 ⁇ m or less, 30 ⁇ m or less, 25 ⁇ m or less, 20 ⁇ m or less, 15 ⁇ m or less, 10 ⁇ m or less, 8 ⁇ m or less, 6 ⁇ m or less, 5 ⁇ m or less, 4.6 ⁇ m or less, or even 4.3 ⁇ m or less.
• a glass composition having a characteristic temperature suitable for mass production is suitable for stable production as fine glass fibers.
• the average fiber diameter is even finer, for example, 3.9 ⁇ m or less, or even 3.5 ⁇ m or less.
• the glass fibers are, for example, long glass fibers (filaments).
• the glass fiber may have at least one shape selected from the group consisting of roving, roving cloth, continuous strand mat, milled fiber, flat fiber, filament mat, chopped strand, yarn, glass cloth, and glass tape.
• the flat fiber has a shape obtained by cutting glass fibers having a cross section with a flat shape such as an ellipse.
• the long diameter D2 of the cross section of the flat fiber is larger than the short diameter D1, and D2/D1 is, for example, 1.2 or more.
• the short diameter D1 is, for example, 0.5 to 25 ⁇ m.
• the long diameter D2 is, for example, 0.6 to 300 ⁇ m.
• the length L of the flat fiber is, for example, 10 to 100,000 ⁇ m.
• the flat fiber can be obtained by a known method.
• the cross-sectional shape of the flat fiber may have a concave shape in which the surface extending along the long diameter D2 is recessed further back in the center than at the ends.
• the glass fibers can be produced by a method including the steps of melting the glass composition of this embodiment and forming the molten glass composition into glass fibers.
• the glass filler of the present embodiment is composed of the above-mentioned glass composition.
• the glass filler may be at least one selected from the group consisting of glass flakes, glass powder, glass beads, and fine flakes.
• Flake glass is also called scale glass and has a flake-like shape.
• the average particle size of flake glass is, for example, 0.2 to 15,000 ⁇ m.
• the aspect ratio of flake glass is, for example, 2 to 1,000.
• the aspect ratio can be determined by dividing the average particle size by the average thickness.
• the average thickness can be determined by measuring the thickness t of 100 or more pieces of flake glass using a scanning electron microscope (SEM) and calculating the average value.
• SEM scanning electron microscope
• the average particle size of flake glass and other glass fillers can be determined by the particle size (D50) corresponding to a cumulative volume percentage of 50% in the particle size distribution measured by the laser diffraction scattering method.
• Flake glass can be obtained by known methods such as the blow method and cup method.
• Glass powder is a powdered glass, and is produced by grinding glass.
• the average particle size of the glass powder is, for example, 1 to 500 ⁇ m.
• the particle size of the glass powder is defined as the diameter of a sphere having the same volume as a particle of the glass powder.
• Glass powder can be obtained by known methods.
• Glass beads have a spherical or nearly spherical shape.
• the average particle size of glass beads is, for example, 1 to 500 ⁇ m.
• the particle size of glass beads is defined as the diameter of a sphere having the same volume as a glass bead particle. Glass beads can be obtained by known methods.
• Fine flakes are thin flake glass. Fine flakes may be made of flake glass with an average thickness of 0.1 to 2.0 ⁇ m, or may contain 90% or more by mass of flake glass with a thickness in the range of 0.01 to 2.0 ⁇ m. Fine flakes with such a small average thickness and small variation in thickness are highly effective in reinforcing resin and are also excellent in reducing the molding shrinkage rate of resin. Fine flakes are also suitable for relaxing the restrictions on the thickness of resin molded bodies compared to conventional methods. Fine flakes are preferably made of flake glass with an average thickness of 0.1 to 1.0 ⁇ m. Fine flakes preferably contain 90% or more by mass of flake glass with a thickness in the range of 0.05 to 1.0 ⁇ m. Fine flakes can be obtained by the method described for flake glass.
• the glass filler can be produced by a method including a step of melting the glass composition of this embodiment and a step of forming the molten glass composition into a glass filler.
• the glass fiber and glass filler of the present embodiment can be used in various products, such as molded products, filler-containing products, and resin products, as exemplified below.
• the molded article of the present embodiment contains the above-mentioned glass fiber and is molded into a predetermined shape.
• the molded article may be at least one selected from the group consisting of, but not limited to, a rubber reinforcing cord, a nonwoven fabric, a prepreg, a reinforced plastic, a printed circuit board, an inorganic cured material, a filter, a heat insulating material, a sound absorbing material, and a battery separator.
• the filler-containing product of the present embodiment contains the above-mentioned glass filler.
• the filler-containing product may be at least one selected from the group consisting of, but not limited to, reinforced plastics, paints, inks, printed circuit boards, inorganic cured bodies, and cosmetics.
• the resin product of the present embodiment includes the above-mentioned glass fiber and/or glass filler and a resin.
• the resin product may be an electrical insulating member or a mechanical member. Examples of these members are as described above.
• the resin may be a thermoplastic resin.
• the thermoplastic resin is not particularly limited, but may be, for example, polyvinyl chloride, polypropylene, polyethylene, polystyrene, polyester, polyamide, polycarbonate, polybutylene, polybutylene terephthalate, or a copolymer thereof.
• polybutylene terephthalate When polybutylene terephthalate is used, the effect of suppressing warping of the molded product and improving the dimensional stability by mixing with the glass filler is increased.
• Flake-like glass, flat fiber, and fine flakes have a relatively large specific surface area and are suitable for ensuring the bonding force between the thermoplastic resin and the glass filler.
• a glass composition comprising the components:
• the glass fiber according to the technique 30, having at least one shape selected from the group consisting of roving, roving cloth, continuous strand mat, milled fiber, flat fiber, filament mat, chopped strand, yarn, glass cloth and glass tape.
• the glass filler according to Technology 32 which is at least one selected from the group consisting of flake glass, glass powder, glass beads, and fine flakes.
• a molded article comprising the glass fiber according to Art 30, which is at least one selected from the group consisting of a rubber reinforcing cord, a nonwoven fabric, a prepreg, a reinforced plastic, a printed circuit board, an inorganic cured material, a filter, a heat insulating material, a sound absorbing material, and a battery separator.
• a filler-containing product comprising the glass filler according to Art 32, which is at least one selected from the group consisting of reinforced plastics, paints, inks, printed circuit boards, inorganic cured materials, and cosmetics.
• tin (IV) oxide SnO 2
• CeO 2 cerium oxide
• sodium sulfate was used as the SO3 source
• lithium sulfate monohydrate was used as the SO3 source.
• the methods for evaluating the characteristics are described below.
• (Working temperature) The relationship between viscosity and temperature of the obtained glass composition was examined by a conventional platinum ball pulling method, and the working temperature was obtained from the results.
• the platinum ball pulling method is a method of measuring viscosity by applying the relationship between the load (resistance) applied when a platinum ball is immersed in molten glass and the platinum ball is pulled up at a uniform speed, and the gravity and buoyancy acting on the platinum ball to Stokes' law, which shows the relationship between the viscosity and the falling speed when a minute particle sinks in a fluid.
• the glass composition crushed to a particle size of 1.0 to 2.8 mm was placed in a platinum boat and held for 2 hours in an electric furnace with a temperature gradient (900 to 1500°C), and the devitrification temperature was determined from the maximum temperature of the electric furnace corresponding to the position where crystals appeared. When the glass was opaque and crystals could not be observed, the maximum temperature of the electric furnace corresponding to the position where opacity appeared was taken as the devitrification temperature.
• the particle size is a value measured by a sieving method.
• the temperature difference ⁇ T is the temperature difference obtained by subtracting the devitrification temperature from the working temperature.
• Linear expansion coefficient The average linear expansion coefficient of the obtained glass composition was measured at 50 to 350° C. using a commercially available dilatometer (thermomechanical analyzer, TMA8510, manufactured by Rigaku Corporation). In addition, the glass transition temperature Tg was obtained based on the thermal expansion curve obtained from the TMA device.
• the dielectric constant and dielectric loss tangent at a frequency of 1 GHz were measured using a dielectric constant measuring device using a cavity resonator perturbation method.
• the measurement temperature was 25° C., and the dimensions of the measurement sample were a rectangular parallelepiped with a height of 100 mm and a square base with sides of 1.5 mm.
• Glass samples with less than 400 bubbles per 100 g were rated as A, those with 400 to 2000 bubbles per 100 g were rated as B, those with 2000 to 10,000 bubbles per 100 g were rated as C, and those with 10,000 bubbles or more were rated as D.
• the measurement results are shown in Tables 1 to 4.
• the glass compositions in the tables are all expressed in mass %.
• Fe 2 O 3 and SnO 2 in the tables represent T-Fe 2 O 3 and T-SnO 2 , respectively.
• the glass composition of Comparative Example 1 has an E-glass composition. E-glass is inferior in average linear expansion coefficient and Young's modulus at 50 to 350°C.
• the glass composition of Comparative Example 2 has an S-glass composition. S-glass has a high working temperature and a negative ⁇ T, and is inferior in mass productivity.
• the glass composition of Comparative Example 3 has the glass composition of Example 2 of Patent Document 1. This glass is inferior in Young's modulus and has a slightly high working temperature.
• the glass composition of Comparative Example 4 has the glass composition of Example 2 of Patent Document 2. This glass is inferior in average linear expansion coefficient at 50 to 350°C.
• Comparative Example 4 The reason that the linear expansion coefficient of Comparative Example 4 is higher (33 ⁇ 10 ⁇ 7 /°C) than the measured value (29 ⁇ 10 ⁇ 7 /°C) in Patent Document 2 is due to the difference in the temperature range in which it was measured. In addition, when the present inventor conducted a follow-up test, Comparative Example 4 had a negative ⁇ T, and was inferior in mass productivity. The glass compositions of Comparative Examples 5 to 16 were also insufficient in at least one of the average linear expansion coefficient, Young's modulus, and difference ⁇ T.

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