Reference

Cyclic urea with an imidazolidinic structure and its use in producing textile finishes

Cyclic urea with an imidazolidinic structure and its use in producing textile finishes. Mabire, Frederic; Blanc, Alain (Societe Francaise Hoechst S. A., Fr.). Eur. Pat. Appl. EP 141755 A2 15 May 1985, 15 pp. DESIGNATED STATES: R: CH, DE, FR, GB, LI. (French). (European Patent Organization). CODEN: EPXXDW. CLASS: ICM: C07D233-40. ICS: D06M013-38. APPLICATION: EP 84-402239 7 Nov 1984. PRIORITY: FR 83-17702 8 Nov 1983. DOCUMENT TYPE: Patent CA Section: 40 (Textiles) Section cross-reference(s): 28 Title compds. (I, R = H, C1-4 alkyl) are prepd. by the aq. condensation of glyoxal [107-22-2] with RNHCONHR (R = H, C1-4 alkyl) at pH 4-7, 40-60° and in the presence of 2-150 mmol (based on glyoxal) orthophosphoric acid catalysts. 107-22-2 is also in the experiment. Thus, a mixt. of glyoxal 4.67, orthophosphoric acid 0.109, NaOH 0.176, and N,N'-dimethylurea [96-31-1] 5 mol was heated at 40° at pH 5.8 for 4 h under stirring and aged 15 h at room temp. to give 87.2% I (R = Me) (II) [3923-79-3]. A similar prepn. using citric acid as the acid catalyst gave a 7% yield of II. .

Thermoplastic polymers foamable by heat

Thermoplastic polymers foamable by heat. Huch, Peter; Schroeder, Guenter; Metzger, Wolfgang (Roehm G.m.b.H., Ger.). Ger. DE 1595214 28 Jul 1977, 4 pp. (German). (Germany). CODEN: GWXXAW. CLASS: IC: C08F220-06. APPLICATION: DE 64-1595214 19 Sep 1964. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) Methacrylic acid (I) was copolymd. with methacrylonitrile (II) and, in some cases, other monomers in the presence of free radical catalysts and urea [57-13-6] or MeNHCONHMe [96-31-1], and the copolymers were heated to decomp. the urea or MeNHCONHMe. The decompn. products caused foaming of the copolymers and the formation of imide groups in the polymers. The foams had high heat deformation resistance and solvent resistance. Thus, a mixt. of I 46, II 54, urea 5, and AIBN 0.2 g was polymd. at 50.degree. for 48 h and heated at 230.degree. for 2.5 h to prep. a foam with d. 0.19 kg/L, heat deformation temp. 250.degree., flexural strength 38 kg/cm2, and impact strength 0.4 cm kg/cm2.