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US 5,702,521 AGranted
Air-entrained concrete with lignin-containing air-entraining agent
AssigneeHercules Incorporated
InventorRichard Robert Suchanec
Life of this patent
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Abstract
Resinous compositions comprising lignin and polymerized rosin. Use of salts of the resinous compositions as concrete air-entraining agents and asphalt emulsifiers.
Claims18
Air-entrained concrete containing an air-entraining agent comprising alkali metal salt of lignin and alkali metal salt of polymerized rosin.
Dependencies are inferred from the claim text.