Resources Contact Us Home
Phenol formaldehyde resins, their manufacture and use

Image Number 2 for United States Patent #4132699.

Low molecular weight liquid phenol formaldehyde resins and processes for producing them are described. Preferred products are used as foundry binders and are made by forming a low molecular weight liquid novolak, removing free phenol while retaining a low molecular weight, and reacting with additional formaldehyde in the presence of an alkaline catalyst under conditions that yield a low molecular weight.

  Recently Added Patents
Securing information by hiding identity on a computing device
Antitumoral compounds
Inductive antenna coupling
Communications in an asynchronous cellular wireless network
Controlling ring-back tone output prior to a communication connection in mobile terminal
Method and device for monitoring and analyzing signals
Vacuum cleaner filter adapter ring
  Randomly Featured Patents
Smart water timer
Passive-dosing dispenser employing captive internally-generated gas bubble to provide product isolation
Advanced photo system format selector
Air silencer for an internal combustion engine
Method of operating an internal combustion engine arrangement
Method and system for call signaling in telephone calls over a packet-switched network
Filter cartridge
Polyurethane foam
Transcription factor stress-related proteins and methods of use in plants
Camera having a display panel