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US 3,947,425 AGranted
Rapid curing, hydrophilic resin compositions
AssigneeWeyerhaeuser Company
InventorsHarlan G. Freeman, Maurice F. Gillern, Harry A. Smith
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AssigneeWeyerhaeuser Company
InventorsHarlan G. Freeman, Maurice F. Gillern, Harry A. Smith
Estimating the term…
Described herein are hydrophilic resin products having particular utility in rapid curing adhesives for wood and other materials. Processes for producing these resins and hydrophilic adhesives produced therefrom are also described. The resins are prepared by reacting an aldehyde condensation polymer, such as a phenol-formaldehyde condensation polymer, with a strong mineral acid salt, i.e., a hydrochloric, nitric, or sulfuric acid salt, of m-hydroxy aniline, 2,6-diaminopyridine or 4,4'-diaminodiphenylmethane. When these resins are blended with an appropriate curing agent, such as an aldehyde, the resulting adhesives cure very rapidly at ambient temperatures. While uncured, these adhesives are hydrophilic and thus water washable, but when cured, they are insoluble in water and common organic solvents.
A hydrophilic resin composition comprising the reaction product of (a) a resin produced by reacting a ketone-aldehyde prepolymer with a polyhydroxy aromatic compound, the aldehyde:ketone mole ratio in said resin being from 1.5:1 to 6:1 and the polyhydroxy aromatic compound:aldehyde mole ratio in said resin being from 0.2:1 to 5:1, said resin containing substantially no free aldehyde and being free of dominant amide-forming substituents;
A rapid curing, hydrophilic adhesive composition comprising:
The composition of claim 28 wherein the salt is m-hydroxy aniline hydrochloride.
A process for producing a hydrophilic resin composition comprising reacting (a) a resin produced by reacting a ketone-aldehyde prepolymer with a polyhydroxy aromatic compound, the aldehyde:ketone mole ratio in said resin being from 1.5:1 to 6:1 and the polyhydroxy aromatic compound:aldehyde mole ratio in said resin being from 0.2:1 to 5:1, said resin containing substantially no free formaldehyde and being free of dominant amide-forming substituents;
Dependencies are inferred from the claim text.