Glass microbubbles, raw product, and methods of making the same

Patent metadata

Field	Value
Publication number	US-10053387-B2
Application number	US-201414903522-A
Country	US
Kind code	B2
Filing date	Jul 3, 2014
Priority date	Jul 18, 2013
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

Glass microbubbles include on an average weight basis: from 25.0 to 37.4 percent by weight of silicon; from 5.7 to 8.6 percent by weight of calcium; from 5.2 to 14.9 percent by weight, on a total combined weight basis, of at least one of sodium or potassium; from 0.3 to 0.9 percent of boron; and from 0.9 to 2.6 percent of phosphorus, wherein the weight ratio of phosphorus to boron is in the range of from 1.4 to 4.2, and wherein the glass microbubbles comprise less than 0.4 percent by weight of zinc. A raw product including the glass microbubbles, and methods of making the raw product are also disclosed.

First claim

What is claimed is:

1. Glass microbubbles comprising, on an average basis:
from 28.1 to 37.4 percent by weight of silicon;
from 5.7 to 8.6 percent by weight of calcium;
from 5.2 to 14.9 percent by weight, on a total combined weight basis, of at least one of sodium or potassium;
from 0.3 to 0.9 percent of boron; and
from 0.9 to 2.6 percent of phosphorus,

wherein the weight ratio of phosphorus to boron is in the range of from 1.4 to 4.2, and wherein the glass microbubbles comprise less than 0.4 percent by weight of zinc.

2. Glass microbubbles according to claim 1 , comprising from 6.4 to 7.9 percent by weight of calcium.

3. Glass microbubbles according to claim 1 , comprising, on a total combined weight basis, from 6.7 to 9.1 percent by weight of at least one of sodium or potassium.

4. Glass microbubbles according to claim 1 , comprising from 0.4 to 0.6 percent by weight of boron.

5. Glass microbubbles according to claim 1 , comprising from 1.0 to 2.0 percent by weight of phosphorus.

6. Glass microbubbles according to claim 1 , wherein the weight ratio of phosphorus to boron is in the range of from 1.8 to 2.5.

7. Glass microbubbles according to claim 1 , comprising less than 0.01 percent by weight of zinc.

8. Glass microbubbles according to claim 1 , wherein the glass microbubbles have a true density of less than 0.7 g/cm 3 .

9. A method of making raw product comprising glass microbubbles, the method comprising heating and expanding feed to provide the raw product, wherein the glass microbubbles comprise, on an average basis:
from 28.1 to 37.4 percent by weight of silicon;
from 5.7 to 8.6 percent by weight of calcium;
from 5.2 to 14.9 percent by weight, on a combined weight basis, of at least one of sodium or potassium;
from 0.3 to 0.9 percent of boron; and
from 0.9 to 2.6 percent of phosphorus,

wherein the weight ratio of phosphorus to boron is in the range of from 1.4 to 4.2, and wherein the glass microbubbles comprise less than 0.4 percent by weight of zinc.

10. A method according to claim 9 , wherein the glass microbubbles comprise from 0.4 to 0.6 percent by weight of boron.

11. A method according to claim 9 , wherein the glass microbubbles have a true density of less than 0.7 g/cm 3 .

12. A raw product comprising glass microbubbles and unexpanded glass particles, wherein on an average basis, the
raw product comprises from 28.1 to 37.4 percent by weight of silicon;
from 5.7 to 8.6 percent by weight of calcium;
from 5.2 to 14.9 percent by weight, on a combined weight basis, of at least one of sodium or potassium;
from 0.3 to 0.9 percent of boron; and
from 0.9 to 2.6 percent of phosphorus,

wherein the weight ratio of phosphorus to boron is in the range of from 1.4 to 4.2, and wherein the glass microbubbles comprise less than 0.4 percent by weight of zinc.

13. A raw product according to claim 12 , comprising from 0.4 to 0.6 percent by weight of boron.

14. A raw product according to claim 12 , wherein the raw product has a true density of less than 0.7 g/cm 3 .

Assignees

• 3M Innovative Properties Co

Inventors

• Morris Geoffrey P

Classifications

• C03B19/107

  Forming hollow beads (chemical aspects C03C11/002) · CPC title

• C03C11/002 Primary

  Hollow glass particles · CPC title

• C03C1/002

  Use of waste materials, e.g. slags · CPC title

• C03C3/064

  containing boron · CPC title

• C03C3/097

  containing phosphorus, niobium or tantalum · CPC title