Preparation of aqueous dispersions of blocked aromatic polyisocy

Details Preparation of aqueous dispersions of blocked aromatic polyisocy Preparation of aqueous dispersions of blocked aromatic polyisocy

1974-05-24

1976-01-20

Padgett, Benjamin R.

Compositions

Reductive bleachant, deoxidant, reductant, or generative

Sulfur containing reductant, bleachant, deoxidant, or...

117 76T, 117 76F, 117 77, 1171388F, 1171388N, 117139, 156330, 156331, 156332, 156335, 260 292TN, 260 293, 260 775TB, 260471C, 252182, C09K 300, B23B 2700, C08L 6106, C07C 7946

Patent

active

039336778

ABSTRACT:
Aqueous dispersions of aromatic polyisocyanates blocked with phenolic compounds are prepared by mixing the polyisocyanate dissolved in an organic water-soluble solvent and an aqueous solution containing an excess of the phenolic compound in the presence of an alkali metal hydroxide catalyst. When the phenolic compound is resorcinol, the excess resorcinol in the dispersion may be reacted with formaldehyde to form a resorcinol-formaldehyde resin; when the phenolic compound is phenol, excess resorcinol may be added and formaldehyde reacted with it to form the resorcinol-formaldehyde resin, a polyepoxide and a rubber latex may be also dispersed thus forming a dispersion that may be used to form single dip adhesive coatings on polyester substrates which will adhere to rubber.

REFERENCES:
patent: 3226276 (1965-12-01), Rye et al.
patent: 3234067 (1966-02-01), Krysiak
patent: 3268467 (1966-08-01), Rye et al.
patent: 3278333 (1966-10-01), Titzmann et al.
patent: 3438922 (1969-04-01), Ueno et al.
patent: 3454621 (1969-07-01), Engel, Jr.
patent: 3489744 (1970-01-01), Schwarcz et al.
patent: 3668186 (1972-06-01), Duncan et al.

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