Hollow glass spheres

Claim 2

Hollow glass spheres made by heating solid glass particles, said spheres having average densities of approximately 0.10 grams/cc to approximately 2.0 grams/cc and consisting essentially of the following ingredients in the following amounts stated as weight percentages: ______________________________________ SiO.sub.2 50-57 R.sub.2 O 2-15 B.sub.2 O.sub.3 0-20 S .05-1.5 RO 2-25 RO.sub.2 other than SiO.sub.2 0-5 R.sub.2 O.sub.3 other than B.sub.2 O.sub.3 0-10 R.sub.2 O.sub.5 0-5 F 0-5, ______________________________________ wherein R represents a metal or other element, having a valence of 1, 2, 3, 4, or 5 as dictated by the formulae set forth above, which combines with oxygen, and wherein the hollow glass spheres have a gradient quotient of 0.8 to 1.3.

Claim 3

Hollow glass spheres as in claim 1 wherein R 2 O is Na 2 O, K 2 O or Li 2 O.

Claim 4

Hollow glass spheres as in claim 1 wherein R 2 O is Na 2 O, K 2 O and Li 2 O which are present in weight percentages of 2.5 to 12.8, 3.8 to 10.0 and 1.0 to 3.0, respectively.

Claim 5

Hollow glass spheres as in claim 1 wherein R 2 O is Na 2 O, K 2 O and Li 2 O which are present in the amounts of approximately one part by weight Li 2 O, to two parts by weight Na 2 O, to three parts by weight K 2 O, such that Li 2 O, Na 2 O and K 2 O are included in the glass in a substantially molar balance.

Claim 6

Hollow glass spheres as in claim 1 wherein B 2 O 3 is present in a weight percentage of 6 to 15.

Claim 7

Hollow glass spheres as in claim 1 wherein RO is CaO or ZnO.

Claim 8

Hollow glass spheres as in claim 1 where RO is CaO and ZnO which are present in weight percentages of 5 to 20 and 1.5 to 4.0, respectively.

Claim 9

Hollow glass spheres as in claim 1 wherein RO 2 other than SiO 2 is substantially absent.

Claim 10

Hollow glass spheres as in claim 1 wherein R 2 O 3 other than B 2 O 3 is Al 2 O 3 .

Claim 11

Hollow glass spheres as in claim 9 wherein Al 2 O 3 is present in a weight percentage of 2 to 7.

Claim 12

Hollow glass spheres as in claim 1 wherein R 2 O 5 is P 2 O 5 and is present in a weight percentage of 0.5, to 4.0.

Claim 13

Hollow glass spheres as in claim 1 wherein F is present in a weight percentage of 1.5 to 2.5.

Claim 14

A product of hollow and solid glass spheres made by heating solid glass particles, said product having an average density of approximately 0.10 grams/cc to approximately 2.0 grams/cc and consisting essentially of the following ingredients in the following amounts stated as weight percentages: ______________________________________ SiO.sub.2 50-57 R.sub.2 O 2-15 B.sub.2 O.sub.3 0-20 S .05-1.5 RO 2-25 RO.sub.2 other than SiO.sub.2 0-5 R.sub.2 O.sub.3 other than B.sub.2 O.sub.3 0-10 R.sub.2 O.sub.5 0-5 F 0-5, ______________________________________ wherein R represents a metal or other element, having a valence of 1, 2, 3, 4, or 5 as dictated by the formulae set forth above, which combines with oxygen, and wherein the hollow glass spheres have a gradient quotient of 0.8 to 1.3.

Claim 15

A product of hollow and solid glass spheres made by heating solid glass particles, said product having an average density of approximately 0.10 grams/cc to approximately 2.0 grams/cc and consisting essentially of the following ingredients in the following amounts stated as weight percentages: ______________________________________ SiO.sub.2 50-57 R.sub.2 O 2-15 B.sub.2 O.sub.3 0-20 S .05-1.5 RO 2-25 RO.sub.2 other than SiO.sub.2 0-5 R.sub.2 O.sub.3 other than B.sub.2 O.sub.3 0-10 R.sub.2 O.sub.5 0-5 F 0-5, ______________________________________ wherein R represents a metal or other element, having a valence of 1, 2, 3, 4, or 5 as dictated by the formulae set forth above, which combines with oxygen, and wherein the hollow glass spheres have a gradient quotient of 0.8 to 1.3.

Claim 16

A product of glass spheres as in claim 13 wherein R 2 O is Na 2 O, K 2 O or Li 2 O.

Claim 17

A product of glass spheres as in claim 13 wherein R 2 O is Na 2 O, K 2 O and Li 2 O which are present in weight percentages of 2.5 to 12.8, 3.8 to 10.0 and 1.0 to 3.0, respectively.

Claim 18

A product of glass spheres as in claim 13 wherein R 2 O is Na 2 O, K 2 O and Li 2 O which are present in the amounts of approximately one part by weight Li 2 O, to two parts by weight Na 2 O, to three parts by weight K 2 O, such that Li 2 O, Na 2 O and K 2 O are included in the glass in a substantially molar balance.

Claim 19

A product of glass spheres as in claim 13 wherein B 2 O 3 is present in a weight percentage of 6 to 15.

Claim 20

A product of glass spheres as in claim 13 wherein RO is CaO or ZnO.

Claim 21

A product of glass spheres as in claim 13 wherein RO is CaO and ZnO which are present in weight percentages of 5 to 20 and 1.5 to 4.0, respectively.

Claim 22

A product of glass spheres as in claim 13 wherein RO 2 other than SiO 2 is substantially absent.

Claim 23

A product of glass spheres as in claim 13 wherein R 2 O 3 other than B 2 O 3 is Al 2 O 3 .

Claim 24

A product of glass spheres as in claim 21 wherein Al 2 O 3 is present in a weight percentage of 2 to 7.

Claim 25

A product of glass spheres as in claim 13 wherein R 2 O 5 is P 2 O 5 and is present in a weight percentage of 0.5 to 4.0.

Claim 26

A product of glass spheres as in claim 13 wherein F is present in a weight percentage of 1.5 to 2.5.

Claim 27

Hollow glass spheres made by heating solid glass particles, said spheres consisting essentially of the following ingredients in the following amounts stated as weight percentages: ______________________________________ SiO.sub.2 50-57 Na.sub.2 O 2.5-12.8 K.sub.2 O 3.8-10.0 Li.sub.2 O 1.0-3.0 B.sub.2 O.sub.3 6-15 S .05-1.5 CaO 5-20 ZnO 1.5-4.0 Al.sub.2 O.sub.3 2-7 P.sub.2 O.sub.5 .5-4.0 F 1.5-2.5 ______________________________________ wherein the hollow glass spheres have a gradient quotient of 0.8 to 1.3.

Claim 28

Hollow glass spheres made by heating solid glass particles, said spheres consisting essentially of the following ingredients in the following amounts stated as weight percentages: ______________________________________ SiO.sub.2 50-57 Na.sub.2 O 2.5-12.8 K.sub.2 O 3.8-10.0 Li.sub.2 O 1.0-3.0 B.sub.2 O.sub.3 6-15 S .05-1.5 CaO 5-20 ZnO 1.5-4.0 Al.sub.2 O.sub.3 2-7 P.sub.2 O.sub.5 .5-4.0 F 1.5-2.5 ______________________________________ wherein the hollow glass spheres have a gradient quotient of 0.8 to 1.3.

Claim 29

Hollow glass spheres as in claim 25 wherein Na 2 O, K 2 O and Li 2 O are present in the amounts of approximately one part by weight Li 2 O, to two parts by weight Na 2 O, to three parts by weight K 2 O, such that Li 2 O, Na 2 O and K 2 O are included in the glass in a substantially molar balance.

Claim 30

An article of manufacture comprising a polymeric compound and dispersed therein the hollow glass spheres made by heating solid glass particles, said spheres having average densities of approximately 0.10 grams/cc to approximately 2.0 grams/cc and consisting essentially of the following ingredients in the following amounts stated as weight percentages: ______________________________________ SiO.sub.2 50-57 R.sub.2 O 2-15 B.sub.2 O.sub.3 0-20 S .05-1.5 RO 2-25 RO.sub.2 other than SiO.sub.2 0-5 R.sub.2 O.sub.3 other than B.sub.2 O.sub.3 0-10 R.sub.2 O.sub.5 0-5 F 0-5, ______________________________________ wherein R represents a metal or other element, having a valence of 1, 2, 3, 4, or 5 as dictated by the formulae set forth above, which combines with oxygen, and wherein the hollow glass spheres have a gradient quotient of 0.8 to 1.3.

Claim 31

An article of manufacture comprising a polymeric compound and dispersed therein the hollow glass spheres made by heating solid glass particles, said spheres having average densities of approximately 0.10 grams/cc to approximately 2.0 grams/cc and consisting essentially of the following ingredients in the following amounts stated as weight percentages: ______________________________________ SiO.sub.2 50-57 R.sub.2 O 2-15 B.sub.2 O.sub.3 0-20 S .05-1.5 RO 2-25 RO.sub.2 other than SiO.sub.2 0-5 R.sub.2 O.sub.3 other than B.sub.2 O.sub.3 0-10 R.sub.2 O.sub.5 0-5 F 0-5, ______________________________________ wherein R represents a metal or other element, having a valence of 1, 2, 3, 4, or 5 as dictated by the formulae set forth above, which combines with oxygen, and wherein the hollow glass spheres have a gradient quotient of 0.8 to 1.3.

Claim 32

An article of manufacture comprising a polymeric compound and dispersed therein the product of hollow and solid glass spheres made by heating solid glass particles, said product having an average density of approximately 0.10 grams/cc to approximately 2.0 grams/cc and consisting essentially of the following ingredients in the following amounts stated as weight percentages: ______________________________________ SiO.sub.2 50-57 R.sub.2 O 2-15 B.sub.2 O.sub.3 0-20 S .05-1.5 RO 2-25 RO.sub.2 other than SiO.sub.2 0-5 R.sub.2 O.sub.3 other than B.sub.2 O.sub.3 0-10 R.sub.2 O.sub.5 0-5 F 0-5, ______________________________________ wherein R represents a metal or other element, having a valence of 1, 2, 3, 4, or 5 as dictated by the formulae set forth above, which combines with oxygen, and wherein the hollow glass spheres have a gradient quotient of 0.8 to 1.3.

Claim 33

An article of manufacture comprising a polymeric compound and dispersed therein the product of hollow and solid glass spheres made by heating solid glass particles, said product having an average density of approximately 0.10 grams/cc to approximately 2.0 grams/cc and consisting essentially of the following ingredients in the following amounts stated as weight percentages: ______________________________________ SiO.sub.2 50-57 R.sub.2 O 2-15 B.sub.2 O.sub.3 0-20 S .05-1.5 RO 2-25 RO.sub.2 other than SiO.sub.2 0-5 R.sub.2 O.sub.3 other than B.sub.2 O.sub.3 0-10 R.sub.2 O.sub.5 0-5 F 0-5, ______________________________________ wherein R represents a metal or other element, having a valence of 1, 2, 3, 4, or 5 as dictated by the formulae set forth above, which combines with oxygen, and wherein the hollow glass spheres have a gradient quotient of 0.8 to 1.3.

Claim 34

An article of manufacture comprising a polymeric compound and the hollow glass spheres made by heating solid glass particles, said spheres consisting essentially of the following ingredients in the following amounts stated as weight percentages: ______________________________________ SiO.sub.2 50-57 Na.sub.2 O 2.5-12.8 K.sub.2 O 3.8-10.0 Li.sub.2 O 1.0-3.0 B.sub.2 O.sub.3 6-15 S .05-1.5 CaO 5-20 ZnO 1.5-4.0 Al.sub.2 O.sub.3 2-7 P.sub.2 O.sub.5 .5-4.0 F 1.5-2.5. ______________________________________ wherein the hollow glass spheres have a gradient quotient of 0.8 to 1.3.

Claim 35

An article of manufacture comprising a polymeric compound and the hollow glass spheres made by heating solid glass particles, said spheres consisting essentially of the following ingredients in the following amounts stated as weight percentages: ______________________________________ SiO.sub.2 50-57 Na.sub.2 O 2.5-12.8 K.sub.2 O 3.8-10.0 Li.sub.2 O 1.0-3.0 B.sub.2 O.sub.3 6-15 S .05-1.5 CaO 5-20 ZnO 1.5-4.0 Al.sub.2 O.sub.3 2-7 P.sub.2 O.sub.5 .5-4.0 F 1.5-2.5. ______________________________________ wherein the hollow glass spheres have a gradient quotient of 0.8 to 1.3.