Highly reactive aromatic hydrocarbon-formaldehyde resin and proc

Details Highly reactive aromatic hydrocarbon-formaldehyde resin and proc Highly reactive aromatic hydrocarbon-formaldehyde resin and proc

1986-03-26

1987-08-25

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From aldehyde or derivative thereof as reactant

525398, 525400, 528232, C08G 1002, C08G 1602

Patent

active

046893920

ABSTRACT:
A highly reactive aromatic hydrocarbon-formaldehyde resin having a diarlymethane content of not more than 5% by weight, essentially containing reactive groups of any one of CH.sub.2 OH, CH.sub.2 OCH.sub.3 and CH.sub.2 OCH.sub.2 OCH.sub.3 at both molecular terminals and having a xylenol value of at least 15 mol/kg as an index of reactivity with a compound having active hydrogen atoms is prepared by reacting an aromatic hydrocarbon such as xylene, mesitylene or naphthalene with formaldehyde at a molar ratio of the formaldehyde to the aromatic hydrocarbon of 2.0 to 5.0, a sulfuric acid concentration of 15 to 35% by weight in an aqueous layer and a reaction temperature of 80.degree. to 110.degree. C. while controlling a formaldehyde conversion within a range of 50 to 70% by mole over the range 4 to 8 hours. By reaction of the aromatic hydrocarbon-formaldehyde resin with the compound having reactive hydrogen atoms such as phenols and carboxylic acids, a modified aromatic hydrocarbon resin capable of giving a cured resin having a high mechanical strength and a high heat resistance can be obtained.

REFERENCES:
patent: 3407178 (1968-10-01), Heinrich
patent: 4082728 (1978-04-01), Aziz et al.
patent: 4410690 (1983-10-01), Miyamoto et al.
Polymer Chemistry (Japan): vol. 12, No. 124, 14-22 (1955).
Die Makromolekulare Chemie XLIII, 189-219 (1961).
Angew Chem. 60, No. 4, 88-96 (1948).
British Plastics, Sep., issue, 564-567 (1965).

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