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US 2007/0191574 A1Published application
Low Formaldehyde Emission Fiberglass
AssigneeKnauf Insulation, Inc.
InventorsWilliam S. Miller, Brian L. Swift, Scott L. Stillabower
Life of this patent
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Abstract
Disclosed are binders including urea-extended phenol-formaldehyde alkaline resole resins to which melamine-containing resin has been added, and non-woven fiber compositions made therewith. The disclosed binders may be cured to low formaldehyde-emission and low trimethylamine-emission, water-resistant thermoset binders.
Claims15
A method for preparing an aqueous binder, said method comprising:
- (a) selecting an aqueous resole resin having a pH greater than about 7, said resin prepared by reacting phenol with excess formaldehyde under alkaline conditions;
- (b) adding to said aqueous resole resin and reacting therewith aqueous urea in an amount to produce a premix containing about 70 parts by weight of resole resin solids and about 30 parts by weight of urea solids;
- and
- (c) mixing into said premix a melamine-containing resin and aqueous urea such that resole resin solids, urea solids, and melamine solids are present in said aqueous binder in the range from about 45 to about 50 parts by weight, about 35 to about 45 parts by weight, and about 10 to about 15 parts by weight, respectively, based on the total of resole resin solids, urea solids, and melamine solids.
1 more element
Dependencies are inferred from the claim text.