Minute color-forming capsules and record material provided with such

Claim 1

A PROCESS FOR MAKING MINUTE CAPSULAR ENTITES EN MASSE, EACH ENTITY CONSISTING OF A NUCLEUS OF LIQUID WATERIMMISCIBLE MATERIAL WHICH IS A FIRST ONE OF TWO CHEMICAL REACTANTS THAT REACT UPON CONTACT, THE LIQUID NUCLEUS BEING RETAINED IN A RUPTURABLE WALL OF HYDROPHILIC FLIM-FORMING POLYMERIC MATERIAL, AND THE SECOND OF THE TWO REACTANTS BEING DEPOSITED AS A SHELL ON THE OUTSIDE OF THE WALL, WHICH WALL WHEN INTACT INSULATES THE REACTANTS FROM PHYSICAL CONTACT, INCLUDING THE STEPS OF PREPARING A WARM AQUEOUS SOLUTION OF FLIM-FORMING HYDROPHILIC POLYMERIC MATERIALS, SAID MATERIALS HAVING FRACTION WHICH FORM SOLIDIFIABLE MOLECULAR COMPLEXES IN STAGES IF THE PH OF THE SOLUTION IS CHANGED ACID-WISE, AND SAID SOLUTION HAVING THE LIQUID NUCLEUS MATERIAL DISPERSED THEREIN AS MINUTE DROPLETS AND KEPT SO BY AGITATION OF THE SYSTEM; CHANGING THE PH OF THE SYSTEM ACID-WISE TO A DEGREE TO CAUSE FORMATION OF LIQUID COMPLEX ENTITIES OF A PORTION OF THE POLYMERIC MATERIAL FRACTIONS, SUCH COMPLEX ENTITIES DEPOSITING AROUND EACH OF THE DROPLETS AS LIQUID WALLS, AND KEEPING SUCH WALLED ENTITIES AGITATING IN THE REMAINING AQUEOUS SOLUTION UNTIL CLUSTERS OF SUCH LIQUID-WALLED ENTITIES FORM TO THE DESIRED SIZE; THEREAFTER CHANGING THE PH OF THE SYSTEM FURTHER ACID-WISE TO FORM MORE COMPLEX ENTITIES OF THE REMAINING POLYMERIC MATERIAL WHICH DEPOSIT AROUND THE CLUSTERS INDIVIDUALLY TO FORM LIQUID-WALLED CLUSTERS, THE WALL MATERIAL NOW HAVING A POSITIVE CHARGE; STILL WITH AGITATION, CHILLING THE CLUSTERS TO WHERE THE WALL MATERIAL SETS TO A FIRM CONDITION; AND INTRODUCING INTO THE SYSTEM SMALL PARTICLES OF SOLID MINERAL WHICH IS REACTIVE WITH THE NUCLEUS MATERIAL, WHICH PARTICLES ARE NEGATIVELY CHARGED AND ARE ATTACTED TO THE POSITIVELY CHARGED MATERIAL OF THE WALLS OF THE CLUSTERS TO DEPOSIT THEREON AND FORM AN ENVELOPING ADHERENT SHELL ABOUT EACH CLUSTER WALL BY REASON OF THE DIFFERENT CHARGE FORCES.