Formaldehyde → Formaldehyde;phenol

Temperature

80 °C

Phenol (1 mol) and 50% formaldehyde (0.6 mol) were charged to a reaction vessel and the temperature held below 40° C. while magnesium oxide (0.03 mol) was added and well dispersed. The temperature was then allowed to rise to 70° C. over 30 minutes and maintained at this temperature while a second charge of 60% formaldehyde (1.9 mol) was added slowly over one hour and then held for a further 30 minutes. The temperature was then lowered to 55° C. and vacuum distillation commenced until a viscosity of 85 cSt at 25° C. was obtained, the temperature was then raised once more to 80° C. and held for one hour, the resin was then cooled to 65° C. and held until the water dilutability reached 1:4 at 25° C. The product was then cooled to room temperature and discharged.

1. additionwas added
2. additionwell dispersed
3. temperaturemaintained at this temperature while
4. additionwas added slowly over one hour
5. waitheld for a further 30 minutes
6. customwas then lowered to 55° C.
7. distillationvacuum distillation
8. customcommenced until a viscosity of 85 cSt at 25° C.
9. customwas obtained
10. waitheld for one hour
11. temperaturethe resin was then cooled to 65° C.
12. customat 25° C
13. temperatureThe product was then cooled to room temperature

ORD record

ord-eafe495198df48b982b6251de25e707d

Source dataset

uspto-grants-1991_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05051454