Copolymers containing blocked isocyanate groups, and their use i

Details Copolymers containing blocked isocyanate groups, and their use i Copolymers containing blocked isocyanate groups, and their use i

1981-04-10

1982-06-22

Lieberman, Paul

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525110, 525111, 525528, C08L 6300

Patent

active

043363466

ABSTRACT:
Surface-coating binders based on a copolymer which contains carboxyl groups, blocked isocyanate groups, hydroxyl groups and ether groups, and which, due to partial or complete salification with ammonia or with an organic base, is water-soluble or water-dispersible.
This copolymer contains, as copolymerized units, one or more .alpha.,.beta.-olefinically unsaturated carboxylic acids of 3 to 5 carbon atoms or one or more half-esters of an .alpha.,.beta.-olefinically unsaturated dicarboxylic acid of 3 to 5 carbon atoms, an N-(1-alkenyl) isocyanate blocked with a CH--, OH-- or NH-acidic blocking agent, an adduct of an epoxy resin, based on bisphenol A and epichlorohydrin and having a molecular weight of from 380 to 3,500, with an olefinically unsaturated alcohol of 3 to 20 carbon atoms, and one or more other copolymerizable olefinically unsaturated compounds, and has a mean molecular weight of from 1,000 to 20,000 and an acid number of from 35 to 150 mg of KOH/g.
The novel surface-coating binder is useful for the anodic electrocoating of metallic articles.

REFERENCES:
patent: 4075133 (1978-02-01), Sekmakas et al.
patent: 4085161 (1978-04-01), Sekmakas
Die Makromolekulare Chemie, 172 (1973), pp. 27-47.
Houben-Weyl: "Methoden der Organischen Chemie", vol. 14/2 (1963), pp. 61-70.
W. Machu: Elektrotauchlackierung", p. 163 (pp. 155-179).

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