Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1993-03-10
1994-10-04
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
4284231, 528 71, C08G 1834
Patent
active
053527330
ABSTRACT:
A water based, solvent free, two component polyurethane-polyurea dispersion containing up to 65% solids. The first component is a polyester-polyol phase and an aqueous amine phase mixture. The polyester-polyol is a combination of modified polyester-polyols, low viscosity polyether or polyester-polyols, chain extending low molecular weight polyols, neutralizing amines and a detergent. It has a solids content of 90-100% and is totally hydroxyl functional with a carboxylic acid number of 10 and 50, an hydroxyl number of 180 and 300, an equivalent weight range of 165 and 365 and a viscosity of 600-1500 cps at 25.degree. C. The amine phase is an combination of neutralizing and chain extending amines having ratios preformulated to provide a balanced chain extending cross-linking reaction in aqueous phase with--NCO reactive groups. The aqueous amine blend has an equivalent weight of 40 to 50 and a solids content of 40-60%. The polyester-polyol and amine phases are combined in water at room temperature to form a aqueous component having a solids content of 33 to 48% and has an equivalent ratio between polyester-polyol phase and amine phase of 1.75:1 to 2.25:2. The second component is a 100% solids aliphatic isocyanate having a viscosity of between 1000-3500 cps at 25.degree. C. and provides an NCO to functional groups in the polyester-polyol/amine component ratio of between about 1:1.3 to 1:1.7. This solvent free dispersion dries to a film coating having properties equal to conventional solvent based polyurethane coatings.
REFERENCES:
patent: 4945128 (1990-07-01), Hille et al.
patent: 5227198 (1993-07-01), Laura et al.
Johnson R. F.
Kight III John
R. E. Hart Labs, Inc.
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