LOW-TEMPERATURE, FLUORIDE FREE FIBER GLASS COMPOSITIONS AND PRODUCTS MADE USING SAME
(19)AUSTRALIAN PATENT OFFICE (54) Title LOW-lbMPERATURE, FLUORIDE FREE FIBER GLASS COMPOSITIONS AND PRODUCTS MADEUSING SAME (51)6 International Patent Classification(s) C03C 003/089 C03B 037/02 (21) Application No: 2003265779 (22) Application Date: 2003.08.27 (87) WIPONo: WOCM/020355 (30) Priority Data (31) Number (32) Date (33) Country 60/406,315 2002.08.27US (43) Publication Date : 2004.03.19 (43) Publication Journal Date : 2004.05.06 (71) Applicant(s) PPG INDUSTRIES OHIO, INC. (72) Inventor(s) LI, Hong; RICHARDS, Cheryl A.;COX,E. Jeffrey (H) Application NoAU2003265779 A1(19)AUSTRALIAN PATENT OFFICE (54) Title LOW-lbMPERATURE, FLUORIDE FREE FIBER GLASS COMPOSITIONS AND PRODUCTS MADEUSING SAME (51)6 International Patent Classification(s) C03C 003/089 C03B 037/02 (21) Application No: 2003265779 (22) Application Date: 2003.08.27 (87) WIPONo: WOCM/020355 (30) Priority Data (31) Number (32) Date (33) Country 60/406,315 2002.08.27US (43) Publication Date : 2004.03.19 (43) Publication Journal Date : 2004.05.06 (71) Applicant(s) PPG INDUSTRIES OHIO, INC. (72) Inventor(s) LI, Hong; RICHARDS, Cheryl A.;COX,E. Jeffrey An essentially fluoride-free, boron-containing fiber glass composition has a forming window greater than 50° C. and a forming temperature less than 1190° C., whereby it can substitute for conventional fluoride and boron-containing fiber glass composition without significantly changing operating parameters of the fiber forming process. The composition comprises: SiO<SUB>2 </SUB>50-54 weight percent, Al<SUB>2</SUB>O<SUB>3 </SUB>12-15 percent, CaO 22-25 percent, MgO 1-4 percent, B<SUB>2</SUB>O<SUB>3 </SUB>5-8 percent, Na<SUB>2</SUB>O+K<SUB>2</SUB>O less than 2 percent, Fe<SUB>2</SUB>O<SUB>3 </SUB>0.1-0.5 percent, F<SUB>2 </SUB>less than 0.1 percent. WHAT IS CLAIMED IS : 1. A glass composition for fiber forming comprising, in percent by weight of total composition: Si02 50-54 percent Al203 12-15 percent CaO 22-25 percent MgO 1-4 percent B203 5-8 percent Na20 + K2O less than 2 percent Fe203 0.1-0. 5 percent F2 less than 0.1 percent the glass having a forming window of at least 50 C and a forming temperature no greater than 1190 C.
2. The glass composition according to claim 1, wherein the B203 content is 5 to 6 weight percent 3. The glass composition according to claim 1 further including SrO, wherein MgO + SrO is 1 to 4 percent C. p 4. The glass composition according to claim 3 wherein MgO + SrO is from 1 to 3 weight percent.
5. The glass composition according to claim 2 wherein the constituents have the following relationship and the following values: AI203/SiO2 greater than 0 to 0.50 RO = CaO + MgO + SrO from 24. 75 to 26. 25 RO/ (Si02 + Ai203) from 0.30 to 0.45 (R20 + RO + B203)/ (Si02 + AI203) from 0.40 to 0.55 where R20 = weight percent of Na20 + Li20 + K20, when present in glass. <Desc/Clms Page number 18> 6. The glass composition according to claim 5 wherein the constituents have the following values : Al2O3/ SiO2 from 0.44 to 0.50 RO = CaO + MgO + SrO from 25 to 26 RO/ (SiO2 + Al203) from 0.35 to 0.40 (R20 + RO + B2O3)/(SiO2 + Al203) from 0.45 to 0.50 where R20 = weight percent of Na20 + Li20 + K20, when present in glass.
7. The glass composition according to claim 5 wherein the constituents are in the following weight percent: Si02 52 to 54 weight percent Api203 13 to 15 weight percent CaO 23 to 25 weight percent MgO 1 to 3 weight percent SrO 0 to 3 weight percent MgO + SrO 1 to 3 weight percent 8. The glass composition according to claim 7, further including : total iron 0.05 to 0. 8 weight percent S03 greater than 0 weight percent.
9. The glass composition according to claim 8, wherein the constituents have the following values : AI203/Si02 from 0.44 to 0 : 50 RO = CaO + MgO + SrO from 25 to 26 RO/ (SiO2 + Al203) from 0.30 to 0.45 (R20 + RO + B203)/ (Si02 + Al203) from 0.45 to 0.50 where R20 = weight percent of Na20 + Li20 + K20, when present in glass. <Desc/Clms Page number 19> 10. The glass composition according to claim 4, wherein the constituents comprise: Si02 52.86 to 54. 33 weight percentB203 5.15 to 6.05 weight percent Al203 13.44 to 14.14 weight percentCaO 23.42 to 24.16 weight percentMgO 1.17 to 1.5 weight percentSrO 0.12 to 0.15 weight percent MgO + SrO 1.29 to1. 65 weight percent 11. The glass composition according to claim 10 additionally comprising:Total iron 0.29 to 0.37 weight percentS03 greater than 0 weight percent,K20 0.09 to 0.11 weight percentTiO2 0.54 to 0.62weight percentNa20 0.41 to 0.91 weight percent Zr02 less than 0.1 weight percent 12.STDC0522 The glass composition according to claim 11, wherein the constituents have the following values : AI203/Si02 from 0.25 to 0.27RO = CaO + MgO + SrO from 25.02 to 25. 68RO/ (Si02 + Al203) from 0.37 to 0.3. 8 (R20 + RO + B203)/ (SiO2 + Al203) from 0.46 to 0.48 13. The glass composition according to claim 1, wherein the forming temperature is no more than 1185 C.
14. A woven fiber glass cloth wherein at lease one of the glass fiber has the composition of claim 1. <Desc/Clms Page number 20> 15. A printed circuit board comprising a woven fiber glass cloth wherein at least one of the glass fibers has the composition of claim 1.