Viscosity modified formaldehyde-free binder compositions
AssigneeJohns Manville
InventorsZhihua Guo, Uranchimeg Lester, Jawed Asrar, Kiarash Alavi Shooshtari, Mingfu Zhang
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Abstract
Viscosity-modified carbohydrate binder compositions are described. The binder compositions may include a carbohydrate, a nitrogen-containing compound, and a thickening agent. The binder compositions may have a Brookfield viscosity of 7 to 50 centipoise at 20° C. The thickening agents may include modified celluloses such as hydroxyethyl cellulose (HEC) and carboxymethyl cellulose (CMC), and polysaccharides such as xanthan gum, guar gum, and starches.
Claims16
A carbohydrate binder composition comprising a reducing sugar, a nitrogen-containing compound, and a thickening agent, wherein:
- the nitrogen-containing compound is a reaction product of urea (H2N—CO—NH2) and glyoxal,
- the binder composition has a Brookfield viscosity of 7 to 50 centipoise at 20° C. as measured with a Brookfield viscometer using spindle 18 at 60 rpm,
- the binder composition is formaldehyde-free and forms a polymerization product, and
- the thickening agent has a concentration of 0.03 wt. % to 0.3 wt. % of the binder composition.
A blended carbohydrate binder composition comprising a reducing sugar, a nitrogen-containing compound, and a second binder composition, wherein:
- the nitrogen-containing compound is a reaction product of urea (H2N—CO—NH2) and glyoxal,
- the blended carbohydrate binder composition has a Brookfield viscosity of 7 to 50 centipoise at 20° C. as measured with a Brookfield viscometer using spindle 18 at 60 rpm,
- the second binder composition is formaldehyde-free and forms a polymerization product, and
- the blended carbohydrate binder composition comprises a thickening agent at a concentration from 0.03 wt. % to 0.3 wt. % of the blended carbohydrate binder composition.
Dependencies are inferred from the claim text.