B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
42/15, 117/46
B01J 13/02 (2006.01) B01J 13/18 (2006.01) B41M 5/165 (2006.01)
Patent
CA 1104881
Abstract of the Disclosure This invention relates to filterable microcapsules and to a process for preparing such microcapsules which are advan- tageous in the preparation of hot melt coating compositions for pressure-sensitive carbonless copy papers in that the micro- capsules are produced in an aqueous continuous phase and the microcapsules can be easily removed by the aqueous dispersion by vacuum filtering. The process comprises preparing an aqueous dispersion of microcapsules containing an oil solution of a chromogenic material, the chromogenic material being an electron donor type color precursor, and the microcapsules having a primary capsule wall comprising a reaction product of hydroxy- propylcellulose and at least one oil soluble cross-linking agent for hydroxypropylcellulose. The cross-linking agent is selected from the group consisting of the polyfunctional isocyanates, acyl chlorides, phosphoryl chlorides, sulfonyl chlorides, alkylene bischloroformates and mixtures thereof, the primary capsule wall being substantially oil and water impermeable. There is then added and mixed into the aqueous dispersion of microcapsules a phenol and an aldehyde, the aldehyde being selected from the group consisting of acetaldehyde, formaldehyde, glyoxal, glutaraldehyde, fu?fural and mixtures thereof. The mixing is maintained while the phenol and the aldehyde react together to form a condensation polymer, the condensation polymer being insoluble in the aqueous dispersion of micro- capsules thereby precipitating the condensation polymer on the primary capsule wall as a secondary capsule wall.
302327
Lee Yu-Sun
Ridout & Maybee Llp
The Mead Corporation
LandOfFree
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