| 摘要 |
1483832 Hardening microcapsules FUJI PHOTO FILM CO Ltd 8 Jan 1975 [9 Jan 1974] 840/75 Heading B8C Hydrophobic oil-containing microcapsules prepared by complex coacervation of at least two hydrophilic colloids of opposite charge are hardened by adjusting the pH of the reaction system (comprising the microcapsules with gelled walls) to alkalinity and before, during or after pH adjustment, adding formaldehyde and a keto-aldehyde R.CO.CHO where R is a C 1-4 alkyl radical. Conventional natural and synthetic wall-forming colloids and oils (as core materials) are mentioned. The products are useful for conventional purposes including the production of colour transfer and "carbonless" copying sheets. |
