Aminoplast- and phenoplast- resin encapsulated particles
AssigneeInternational Paper Company
InventorsJayesh Shah, Alice M. Simon, Robin D. O'Dell
Life of this patent
Estimating the term…
Abstract
Aminoplast and phenoplast particles are obtained by providing an aqueous solution of such a resin having a water tolerance level, adding a particulate core-forming material in solid form, e.g. mineral particles or cured resin particles, as well as a mixture of water and a stabilizing agent, the amount of water being sufficient to exceed the water tolerance level of the aminoplast or phenoplast, and thus forming an emulsion or suspension of the resin coated particles in water, and advancing cure of the resin to form partially or fully cured resin coatings having a thickness preferably about 5-75 .mu.m encapsulating the particulate core-forming material.
Claims21
Resin encapsulated particles, each said particle comprising a core and a coating thereover, said core being solid and being selected from the group consisting of an inorganic material and a resin, said coating comprising a partially cured or fully cured aminoplast or phenoplast resin having water tolerance.
A method of making aminoplast or phenoplast coated particles comprising
- providing an aqueous solution of an aminoplast or phenoplast resin having a water tolerance level,
- adding core-forming particles and a protective colloid, a water-insoluble stabilizing agent, or mixture thereof together with an amount of water sufficient to exceed the water tolerance level of said resin and thus form uncured or partially cured resin coating over said core-forming particles in water, and
- advancing cure of said uncured or partially cured resin to form partially or fully cured resin coatings having a thickness of 5 to 75 .mu.m encapsulating said particulate core-forming particles.
A method of making cured aminoplast or phenoplast particles comprising providing an aqueous solution of an aminoplast or phenoplast resin having a water tolerance level, adding a particulate core-forming material and a mixture of water and a water-insoluble stabilizing agent to exceed the water tolerance level of said resin and thus form an emulsion or suspension of resin particles in water, and advancing cure of said resin to form partially or fully cured resin coatings encapsulating said particulate core-forming material.
Dependencies are inferred from the claim text.