Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1977-10-27
1978-10-10
Schain, Howard E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
264176F, 528140, 528129, C08G 810
Patent
active
041196112
ABSTRACT:
A two-stage process for making a linear condensate of phenol and formaldehyde which can be extruded as a film or thread. In the first stage phenol and formaldehyde are reacted at about 90.degree. C to produce a clear low-viscosity phenol-methylol liquid, the pH of which is adjusted to a value greater than 3, say between 3.5 and 7. In the second stage the product of the first stage is added in aliquot portions to molten phenol having a pH of 3 or less, while maintaining the temperature at about 100.degree. C. After all the phenol-methylol has been added the mixture is slowly heated as the viscosity increases up to about 150.degree. C until there is no further increase in viscosity. The highly viscous end product can be extruded as a film or thread.
REFERENCES:
patent: 2809178 (1957-10-01), Turner et al.
patent: 2838473 (1958-06-01), Partansky et al.
patent: 3650102 (1972-03-01), Economy et al.
patent: 3716521 (1973-02-01), Economy et al.
patent: 3723588 (1973-03-01), Economy et al.
patent: 3876620 (1975-04-01), Moss
patent: 3959433 (1976-05-01), Sauers
Schain Howard E.
Zimmer Aktiengesellschaft
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