| 摘要 |
Aqueous adhesive composition (I) comprises a mixture comprising: a wheat starch (II), which is fairly/strongly cross linked by the action of trimetaphosphates (IIa) to obtain a sufficient yield from the reaction, in a milky phase i.e. on the granular starch dispersed in water at 30-45% of dry material, at lower than 40[deg]C; and a starch (III) (weakly cross linked by the action of (IIa)), where the ratio of (II) to (III) is 99:1-1:99. Aqueous adhesive composition (I) comprises a mixture comprising: a wheat starch (II), which is fairly/strongly cross linked by the action of trimetaphosphates (IIa) for a period, preferably equal to 2 hours, to obtain a sufficient yield from the reaction, in a milky phase i.e. on the granular starch dispersed in water at 30-45% of dry material, at lower than 40[deg]C (preferably 10-30[deg]C); and a starch (III) (weakly cross linked by the action of (IIa)), where (IIa) is preferably sodium trimetaphosphate, higher than 0.2%, having a phosphorus content (expressed as P2O5) of 69-70% (calculated compared to dry starch) and the ratio of (II) to (III) is 99:1-1:99 (preferably 95:5-5:95). Independent claims are also included for: (1) a process of cross linking a wheat starch comprises the action of (IIa) for a period, preferably equal to 2 hours, to obtain a sufficient yield from the reaction, in a milky phase i.e. on the granular starch dispersed in water at 30-45% of dry material, at lower than 40[deg]C (preferably 10-30[deg]C), where (IIa) is preferably sodium trimetaphosphate, higher than 0.2%, having a phosphorus content (expressed as P2O5) of 69-70% (calculated compared to dry starch); (2) preparation of corrugated cardboard, comprises: distributing (I) on the tops of the flute of a preformed paper web, applying a paper or a folding carton on the tops of flute thus coated with (I) and drying; (3) a corrugated cardboard carton comprising (I); and (4) a product comprising (I). |
