Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1980-07-01
1982-10-12
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
C08G 1880
Patent
active
043540147
ABSTRACT:
Powdered coating compositions having good storage stability and particle size smaller than 0.25 mm, particularly 0.02 and 0.06 mm, based on polyesters which contain hydroxyl groups and melt between 40.degree.-120.degree. C., .epsilon.-caprolactam blocked isophorondiisocyanate adducts, and catalysts, if necessary, and customary additives, wherein isophoronediisocyanate adducts partially blocked with .epsilon.-caprolactam are used as curing agents.
Methods for producing the above mentioned powdered coating compositions, wherein the polyesters containing hydroxyl groups are reacted in the melt or in solvents at temperatures of 0.degree.-150.degree. C., particularly 80.degree.-120.degree. C., with an isophorondiisocyanate adduct blocked with .epsilon.-caprolactam which contains 0.1 to 1 mole of free NCO-groups per mole of adduct and 0.4-1.1 NCO-equivalents separate to OH equivalent.
REFERENCES:
patent: 3822240 (1974-07-01), Schmitt et al.
patent: 3947426 (1976-03-01), Landen
patent: 4246380 (1981-01-01), Gras et al.
Gras Rainer
Wolf Elmar
Chemische Werke Huls Aktiengesellschaft
Welsh Maurice J.
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