The present application relates to a polymer composition comprising from 20 wt % to 30 wt % of a polycarbonate; from 40 wt % to 60 wt % of a polybutylene terephthalate; from 5 wt % to 30 wt % of a reinforcement fiber; from 1 wt % to 10 wt % of glass bubbles, and from 0.3 wt % to 2 wt % of transesterification inhibitor, all contents are based on the total weight of the composition. The polymer composition according to the present invention has improved adhesion to the metal (especially aluminum), even after annealing and anodizing processes are applied.

A glass composition is provided that includes about 55.0 to 60.4% by weight SiO.sub.2, about 19.0 to 25.0% by weight Al.sub.2O.sub.3, about 8.0 to 15.0% by weight MgO, about 7 to 12.0% by weight CaO, less than 0.5% by weight Li.sub.2O, 0.0 to about 1.0% by weight Na.sub.2O, and 0 to about 1.5% by weight TiO.sub.2. The glass composition has a fiberizing temperature of no greater than about 2,500° F. Glass fibers formed from the inventive composition may be used in applications that require high stiffness, and low weight. Such applications include woven fabrics for use in forming wind blades and aerospace structures.

A glass composition is provided that includes about 55.0 to 60.4% by weight SiO.sub.2, about 19.0 to 25.0% by weight Al.sub.2O.sub.3, about 8.0 to 15.0% by weight MgO, about 7 to 12.0% by weight CaO, less than 0.5% by weight Li.sub.2O, 0.0 to about 1.0% by weight Na.sub.2O, and 0 to about 1.5% by weight TiO.sub.2. The glass composition has a fiberizing temperature of no greater than about 2,500° F. Glass fibers formed from the inventive composition may be used in applications that require high stiffness, and low weight. Such applications include woven fabrics for use in forming wind blades and aerospace structures.

An optical material includes, in mol.%: 50-75% SiO.sub.2, 5-25% Al.sub.2O.sub.3, 2.5-25% MgO, and 1-15% at least one lanthanoid, such that the at least one lanthanoid includes: La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, or oxides or fluorides thereof. An optical material includes at least one lanthanoid and at least one alkaline earth fluoride dopant, such that the at least one lanthanoid includes: La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, or oxides or fluorides thereof, and such that the at least one alkaline earth fluoride dopant comprises BeF.sub.2, MgF.sub.2, CaF.sub.2, SrF.sub.2, and BaF.sub.2.

A glass composition is provided that includes about 57.0 to 62.0% by weight SiO.sub.2, about 20.0 to 25.0% by weight Al.sub.2O.sub.3, about 8.0 to 12.5% by weight MgO, about 7 to 9.0% by weight CaO, about 0.4 to 1.0% by weight Li.sub.2O, 0.0 to about 1.0% by weight Na.sub.2O, about 0 to 0.5% by weight K.sub.2O; and 0.2 to about 1.5% by weight TiO.sub.2. The glass composition has a fiberizing temperature of no greater than about 1,300 C. Such applications include woven fabrics for use in forming wind blades and aerospace structures.

A glass composition is provided that includes about 57.0 to 62.0% by weight SiO.sub.2, about 20.0 to 25.0% by weight Al.sub.2O.sub.3, about 8.0 to 12.5% by weight MgO, about 7 to 9.0% by weight CaO, about 0.4 to 1.0% by weight Li.sub.2O, 0.0 to about 1.0% by weight Na.sub.2O, about 0 to 0.5% by weight K.sub.2O; and 0.2 to about 1.5% by weight TiO.sub.2. The glass composition has a fiberizing temperature of no greater than about 1,300 C. Such applications include woven fabrics for use in forming wind blades and aerospace structures.

Disclosed herein is a glass composition that includes, based on a total weight of the glass composition, 55 wt % to 64 wt % of SiO.sub.2, 15 wt % to 22 wt % of Al.sub.2O.sub.3, 0.1 wt % to 4 wt % of CaO, 2.1 wt % to 10 wt % of MgO, 0 wt % to 8 wt % of ZnO, greater than 0 wt % and less than 7 wt % of CuO, and greater than 13.1 wt % and less than 18 wt % of B.sub.2O.sub.3. Also disclosed herein are a glass fiber and a glass article including the glass composition.

Disclosed herein is a glass composition that includes, based on a total weight of the glass composition, 55 wt % to 64 wt % of SiO.sub.2, 15 wt % to 22 wt % of Al.sub.2O.sub.3, 0.1 wt % to 4 wt % of CaO, 2.1 wt % to 10 wt % of MgO, 0 wt % to 8 wt % of ZnO, greater than 0 wt % and less than 7 wt % of CuO, and greater than 13.1 wt % and less than 18 wt % of B.sub.2O.sub.3. Also disclosed herein are a glass fiber and a glass article including the glass composition.

Disclosed herein are methods for forming low melting point glass fibers comprising providing a glass feedstock comprising a low melting point glass and melt-spinning the glass feedstock to produce glass fibers, wherein the glass transition temperature of the glass fibers is less than or equal to about 120% of the glass transition temperature of the glass feedstock. The disclosure also relates to method for forming low melting point glass frit further comprising jet-milling the glass fibers. Low melting point glass frit and fibers produced by the methods described above are also disclosed herein.

Disclosed herein are methods for forming low melting point glass fibers comprising providing a glass feedstock comprising a low melting point glass and melt-spinning the glass feedstock to produce glass fibers, wherein the glass transition temperature of the glass fibers is less than or equal to about 120% of the glass transition temperature of the glass feedstock. The disclosure also relates to method for forming low melting point glass frit further comprising jet-milling the glass fibers. Low melting point glass frit and fibers produced by the methods described above are also disclosed herein.