GLASS CLOTH, PREPREG AND PRINTED WIRING BOARD

• Main Authors: ENDO MASAO, KAKIZAKI HIROTAKA
• Format: Patent
• Language: English; Japanese
• Published: 03.02.2022
• Subjects: CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; LOOMS; MAKING GRANULES OR PREFORMS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; METALLURGY; METHODS OF WEAVING; MINERAL OR SLAG WOOL; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; PRINTED CIRCUITS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; TEXTILES; TRANSPORTING; WEAVING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WOVEN FABRICS

To provide a low dielectric glass cloth from which a prepreg excellent in insulation reliability can be produced, and a prepreg and a printed wiring board made of the low dielectric glass cloth.SOLUTION: A glass cloth including a glass yarn made of a plurality of glass filaments as warp and weft has a weight loss factor obtained as a product of a weight loss ratio derived from the glass component in heat treatment at 380°C for 2 hours and an average radius of the glass monofilament in the following equation (1) of 0.38 or more and 0.9 or less. The glass cloth has a whiteness degree of 95 or more. Weight loss factor=The weight loss ratio (%)×Average radius of the glass filament (μm) ... (1)SELECTED DRAWING: None 【課題】絶縁信頼性に優れるプリプレグを与えることのできる低誘電ガラスクロス、並びに、当該低誘電ガラスクロスを用いたプリプレグ及びプリント配線板を提供することを目的とする。【解決手段】複数本のガラスフィラメントからなるガラス糸を経糸及び緯糸として構成されたガラスクロスであって、下記式（１）において、３８０℃、２時間の加熱処理におけるガラス成分由来の重量減少割合と、前記ガラスモノフィラメントの平均半径との積として求められる重量減少係数が、０．３８以上０．９以下であり、白色度が、９５以上である、ガラスクロス。重量減少係数＝前記重量減少割合（％）×前記ガラスフィラメントの平均半径（μｍ）・・・（１）【選択図】なし