Production of novel thermosetting phenol-formaldehyde resins by

Details Production of novel thermosetting phenol-formaldehyde resins by Production of novel thermosetting phenol-formaldehyde resins by

1975-12-01

1977-07-19

Woodberry, Edward M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 52, 260 57R, C08G 228, C08G 230

Patent

active

040368165

ABSTRACT:
A novel thermosetting phenol-formaldehyde resin having a preponderance of benzyl ether linkages is characterized by its infra-red spectrum which exhibits absorption at wave numbers of about 1010 cm.sup.-.sup.1, 1050 cm.sup.-.sup.1 and 1230 cm.sup.-.sup.1. The infrared spectrum has a particular ratio of absorbance at 1010 cm.sup.-.sup.1, measured from a base line drawn between wave members of 1030 cm.sup.-.sup.1 and 950 cm.sup.-.sup.1, to that at 1230 cm.sup.-.sup.1, measured from a base line drawn between wave numbers of 1130 cm.sup.-.sup.1 and 1310 cm.sup.-.sup.1 which is less than about 0.1. These novel resins are prepared by the controlled addition of strong acids to thermosetting phenol-formaldehyde resins having a preponderance of benzyl ether linkages and an infrared spectrum exhibiting large adsorption at wave numbers of 1230 cm.sup.-.sup.1, 1050 cm.sup.-.sup.1 and 1010 cm.sup.-.sup.1, causing a decrease of at least 35% in the ratio of absorbance at 1010 cm.sup.-.sup.1, measured from a base line drawn between wave numbers of 1030 cm.sup.-.sup.1 and 950 cm.sup.- .sup.1 to that at 1230 cm.sup.-.sup.1, measured from a base line drawn between wave numbers of 1130 cm.sup.-.sup.1 and 1310 cm.sup.-.sup.1, while leaving substantially unaltered the absorbance at wave numbers of 1230 cm.sup.-.sup.1 and 1050 cm.sup.-.sup.1. The novel resin is capable of many applications and is normally tack-free, although the tack may be controlled by the addition of an organic solvent, such as phenol, thereto.

REFERENCES:
patent: 3485797 (1969-12-01), Robins
patent: 3501552 (1970-03-01), Robins
patent: 3535185 (1970-10-01), Tveten

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