High molecular weight/low molecular weight phenol-formaldehyde curtain coating adhesive composition
Abstract
Abstract A PHENOL-FORMALDEHYDE ADHESIVE COMPOSITION FOR USE IN A GRAVITY CURTAIN COATER IS PREPARED BY MIXING TOGETHER A HIGH MOLECULAR WEIGHT, HIGHLY ADVANCE, PHENOL-FORMALDEHYDE RESIN, A LOW MOLECULAR WEIGHT, LONG-FLOW, PHENOLFORMALDEHYDE RESIN, ANIONIC SURFACTANT HAVING PARTICULAR CHARACTERISTICS, AND A THICKENING AGENT IS SPECIFIED PORTIONS. THE RESINS ARE PREFERABLY FORMULATED BY CONDENSING 1.8 TO 1 2.2 TO 1 MOLES FORMALDEHYDE TO PHENOL UNDER REFLUX CONDITIONS TO A VISCOSITY OF FROM 200-250 CPS. AT 70*F. IN THE PRESENCE OF NOT OVER 10 WT. PERCENT OF AN ALKALINE CATALYST BASED ON THE WEIGHT OF THE RESIN CONSTITUENTS, REMOVING AND COOLING A PORTION OF THE RESIN, HEATING THE REMAINDER OF THE RESIN UNDER REFLUX CONDITIONS TO A VISCOSITY OF FROM 900-1000 CPS. AT 70*F., ADDING THE REMOVED RESIN PORTION TO THE REMAINING PORTION, AND COOLING THE ENTIRE MIXTURE. THE FINAL RESIN MIXTURE HAS A VISCOSITY OF 600-800 CPS. AT 70*F.
Inventors
- 👤 Reino A Jarvi
Bibliographic Details
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