Patent ID: 6034201
Filing Date: 2000-03-07
Classification: C08G

Abstract:
A method of forming a urea formaldehyde resin comprising the steps of:a) heating solid paraformaldehyde to a temperature of 60 to 120.degree. C.;b) adding urea to the heated paraformaldehyde to form a urea mixture and dry-mixing and heating the urea mixture until a temperaature of 80 to 110.degree. C. has been reached;c) after step (b), adding a methanolic quanine base to the urea mixture to form a quanine-urea-formaldehyde mixture and heating until the quanine-urea-formaldehyde mixture is liquefied and cooled to 65.degree. C., and then heating the quanine-urea-formaldehyde mixture until it boils, and then condensing the quanine-urea-formaldehyde mixture for a period of 30 to 100 minutes;d) after step (c), adding additional urea to the quanine-urea-formaldehyde mixture to form a urea enriched mixture, and then condensing the urea enriched mixture for 90 to 180 minutes; ande) after step (d), buffering the urea enriched mixture with lactic acid to form a buffered mixture, and then cooling the buffered mixture.