| 摘要 |
A new binder for finely divided materials which does not emit formaldehyde on processing, is obtained from a composition which contains the reaction product of a di or tricarboxylic acid or its anhydride with ammonia and if necessary a primary amine and/or a compound having at least two OH groups, or as precursor of this reaction product, or a mixture of this di or tricarboxylic acid or its anhydride with a substance which releases ammonia on heating. The use of a composition containing: (i) at least one polycarboxylic acid of formula (I) with (ii) ammonia and if necessary (iii) primary amines and/or compounds with at least two OH groups, and/or a mixture of at least one polycarboxylic acid of formula I and/or its anhydride and at least one substance which releases ammonia on heating and if necessary primary amines and/or compounds with at least two OH groups. R = H or CH2COOH, X = OH or NH2 when Y =H, Y = OH or NH2 when X = H, or X and Y together = a pi -bond, and or an anhydride of polycarboxylic acid (I). Independent claims are included for: (1) a thermally hardenable substance containing at least one reaction product from (i) at least one polycarboxylic acid of formula (I), and R, X, Y, (ii), and (iii) are as defined above, and in addition, at least one further constituent selected from finely divided polymerisates of ethylenically unsaturated monomer , compounds with at least two OH groups, and polycarboxylic acid polymers; (2) a process for preparation of shaped bodies from finely divided materials, by impregnation or mixing of the finely divided material with the composition described above at 120 deg C; (3) a shaped body obtained as above; and (4) a flat-shaped article obtained as above.
|
