Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-11-19
1998-02-03
Clark, W. Robinson H.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525156, 525480, 525481, 525482, 525491, 525492, C08L 6110, C08L 6304, C08L 6106, C08L 6114
Patent
active
057145440
ABSTRACT:
An aromatic hydrocarbon formaldehyde resin novolak, useful as a raw phenolic compound for producing a curing agent and an epoxy resin, an epoxy resin composition which contains a novolak type epoxy resin derived from the above novolak resin and an epoxy resin and is therefore excellent in heat resistance, adhesion and humidity resistance, and a process for the production of a phenolic resin, which comprises reacting an aromatic hydrocarbon formaldehyde resin, phenol and formaldehyde in a novolak-forming reaction in the presence of a catalyst to prepare an aromatic hydrocarbon formaldehyde resin novolak, and treating the reaction product with steam while maintaining the temperature of a reaction mixture at 120.degree. to 195.degree. C. to remove unreacted substances and to decompose high-molecular-weight polymers.
REFERENCES:
patent: 3993851 (1976-11-01), Robinson et al.
patent: 4110279 (1978-08-01), Nelson et al.
patent: 4529790 (1985-07-01), Kamio et al.
patent: 4788236 (1988-11-01), Kopf
patent: 5385989 (1995-01-01), Ohya
Phenoplast, T.S. Carswell, 1947, pp. 31 & 34.
Fukai Takaaki
Kita Seiji
Ohba Michio
Ohya Kazuyuki
Clark W. Robinson H.
Mitsubishi Gas Chemical Company Inc.
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