Novolak-type resins and varnishes

Details Novolak-type resins and varnishes Novolak-type resins and varnishes

1975-04-30

1976-11-23

Woodberry, Edward M.

Stock material or miscellaneous articles

Composite

Of aldehyde or ketone condensation product

260 51R, 260 57R, 260 57A, 260 57C, 260 59R, B32B 904, C08G 808

Patent

active

039938514

ABSTRACT:
Novolak-type resins are prepared by phenolating a toluene-formaldehyde resin of oxygen content 4 - 18% and the product is reacted with hexamine to give a higher softening point of not less than 60.degree. C. The resins may be dissolved in a solvent to form a varnish; such varnishes can impregnate sheet material and laminates of good water resistance and electrical properties can be formed therefrom.

REFERENCES:
patent: 2237634 (1941-04-01), Rosen
patent: 3303167 (1967-02-01), Kakiuchi et al.
patent: 3347952 (1967-10-01), Tanaka
patent: 3370023 (1968-02-01), Huang et al.
patent: 3398107 (1968-08-01), Rowe et al.
patent: 3406132 (1968-10-01), Winegartner
patent: 3535183 (1970-10-01), Tveten et al.
chem. Abstracts, vol. 59, 1963, 7722f, Bakelite.
Chem. Abstracts, vol. 63, 1965, 760a, Moshchinskaya et al.
Chem. Abstracts, vol. 76, 1972, 34873w, Ueno.
Chem. Abstracts, vol. 79, 1973, 147109g, Lizuka, et al.
Chem. Abstracts, vol. 80, 1974, 15674y, Lizuka, et al, Effective Date 11/72.
Chemistry of Phenolic Resins, Martin, p. 153, 1956.

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