| 摘要 |
1,201,113. Gelatine compositions. FACHVEBBAND DER HAUTLEIM-INDUSTRIE E.V. 15 Feb., 1968 [15 Feb., 1967; 14 Nov., 1967], No. 7452/68. Heading C3H. A gelatine solution having substantially stable viscosity up to about 60‹ C. and cross-linkable by heating to a higher temperature contains in aqueous solution in addition to gelatine a compound including formaldehyde in chemically bound form and a delaying agent comprising an aliphatic or cycloaliphatic primary or secondary amine (which may in certain circumstances be replaced by ammonia), the pH of the solution being between 7 and 10. The formaldehyde compound may be hexamethylene tetramine (HMT) or a phenol-formaldehyde resole; HMT may be used with a phenol (reacting to produce a resole and ammonia). When a phenol-formaldehyde resole is present the amine may be replaced by ammonia. The compositions may be used for coating or moulding and as adhesives for abrasive granules. |
