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US 12,612,330 B2Granted
Glass bubbles and articles therefrom
Assignee3M Innovative Properties Company
InventorsYong K. Wu, Mulugeta D. Dejene, Andrew S. D'Souza
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Abstract
A plurality of glass bubbles having, in combination, a D50 size of no greater than 13 micrometers, an average true density of no greater than 0.42 grams per cubic centimeter, and a 90% crush strength of at least 55 megapascals are described. Methods of making such glass bubbles and compositions and articles such as sheet molding compounds and dielectric layers prepared from such glass bubbles are also described.
Claims20
A plurality of glass bubbles having, in combination,
- (i) a D50 of from 9 to 13 micrometers, as measured according to the Bubble Size Procedure;
- (ii) an average true density of 0.32 to 0.42 grams per cubic centimeter, as measured according to the True Density Procedure;
- and
- (iii) a 90% crush strength of at least 55 megapascals and no greater than 110 megapascals, as measured according to the Collapse Strength Procedure.
1 more element
A plurality of glass bubbles having in combination,
- (i) a D50 of from 9 to 13 micrometers, as measured according to the Bubble Size Procedure;
- (ii) an average true density of 0.32 to 0.42 grams per cubic centimeter, as measured according to the True Density Procedure;
- and
- (iii) a 90% crush strength of at least 55 megapascals and no greater than 110 megapascals, as measured according to the Collapse Strength Procedure,
- wherein D95 is from 15 to 24 micrometers, as measured according to the Bubble Size Procedure.
2 more elements
Dependencies are inferred from the claim text.