Stoving enamel containing blocked isocyanates

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

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525440, C08L 6702

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active

044304749

ABSTRACT:
A stoving enamel comprising (a) 30-70% by weight of a mixture of a polymer containing hydroxyl groups having a hydroxyl number between 40 and 240 mg KOH/g with an isocyanurate-free derivative of isophorone diisocyanate containing uretidinedione groups and blocked isocyanate groups, (b) 0-3% by weight of a cross-linking catalyst, (c) 30-60% by weight of an organic solvent, (d) 0-65% by weight of a filler or pigment, (e) 0-5% by weight of a dye, and (f) optionally 0.1-3% by weight of leveling agents, gloss improvers, antioxidants, and/or stabilizers, has improved storage stability, reduced curing time and reduced liberation of blocking agent during cure.

REFERENCES:
patent: 3099642 (1963-07-01), Holtschmidt et al.
patent: 3923743 (1975-12-01), Quiring et al.
patent: 3931117 (1976-01-01), Leonard
patent: 4151152 (1979-04-01), Schmitt et al.
Saunders, J. H., and Frisch, K. C.; High Polymers, vol. XVI; Polyurethanes: _Chemistry and Technology, Part I, Chemistry, Interscience, New York, 1962, _pp. 91-94 and 113-115.

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