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US 4,366,303 AGranted
Particulate resoles with improved cure rate and sinter resistance
AssigneeUnion Carbide Corporation
InventorPeter W. Kopf
Life of this patent
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Abstract
Particulate resoles are produced by mixing phenol, formaldehyde and amine in an aqueous medium containing a protective colloid. The resoles exhibit improved cure rate and sinter resistance when an alkaline compound is added to the reaction mixture after particulate formation.
Claims6
A process for producing a particulate, resole resin comprising the steps of:
- (a) reacting (1) formaldehyde, (2) a phenol, and (3) an effective amount of hexamethylenetetramine or a compound containing amino hydrogen, or mixtures thereof;
- in an aqueous medium containing an effective amount of a protective colloid, for a period of time sufficient to produce a particulate, resole resin dispersed in the aqueous medium;
- (b) cooling the reactive mixture to below about 40.degree. C.;
- (c) reacting the cooled reaction mixture with an alkaline compound for a period of time sufficient to produce a treated resin exhibiting increased cure rates and increased sinter resistance;
- and (d) recovering the resin from the aqueous dispersion.
2 more elements
A particulate, resole resin comprising the product of:
- (1) formaldehyde;
- (2) a phenol;
- and (3) an effective amount of hexamethylenetetramine or a compound containing amino hydrogen, or mixtures thereof;
- which is produced in an aqueous medium containing an effective amount of a protective colloid, for a period of time sufficient to produce a particulate, resole resin dispersed in the aqueous medium;
- said particulate resole resin being cooled to below about 40.degree. C.;
- and wherein a sufficient amount of hydroxyl groups in the resin have been converted to form alkaline phenates to produce a treated resin exhibiting increased cure rates and increased sinter resistance.
3 more elements
Dependencies are inferred from the claim text.