Preparation of soft and hard resins, and their use

Details Preparation of soft and hard resins, and their use Preparation of soft and hard resins, and their use

1978-12-15

1980-09-02

Phynes, Lucille M.

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

Synthetic resins

From aldehyde or derivative thereof as reactant

528259, 528264, 528488, C08G 1212

Patent

active

042207517

ABSTRACT:
A process for the preparation of soft and hard resins, and their use in surface-coating binders.
According to the invention, soft and hard resins are prepared from a urea and a CH-acidic aldehyde by reacting a urea of the general formula (I) ##STR1## where X is oxygen or sulfur and R.sup.1 and R.sup.2 are hydrogen or identical or different alkyl, aryl or aralkyl, or may be an alkyleneurea radical, with at least 2 moles of a CH-acidic aldehyde of the general formula (II) ##STR2## where R.sup.3 is hydrogen and R.sup.4 is alkyl, aryl or aralkyl, or R.sup.3 and R.sup.4 are identical or different alkyl, aryl or aralkyl, in the presence of a strong acid, to give a condensation product, and then treating the latter with a base in an anhydrous medium.
These soft and hard resins are used, in combination with other film-forming agents, as surface-coating binders.

REFERENCES:
patent: 2124151 (1938-07-01), Rothrock
patent: 2572256 (1951-10-01), Garner et al.
patent: 4102840 (1978-07-01), Pusch
Petersen, H., Angewanote Chemie, 76 (1964), pp. 909-919.

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