Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1989-08-31
1991-12-10
Page, Thurman K.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
424 61, 424455, 424456, 424489, 264 43, A61K 746, A61K 950, B32B 2700
Patent
active
050717065
ABSTRACT:
This disclosure is directed to the preparation of oily microcapsules which can be easily tray dried to a free flowing product without requiring special drying equipment. These microcapsules have a cell wall material having a first cell wall of gelatin/carboxymethylcellulose (CMC) which is prehardened (cross-linked) with a material selected from the group consisting of formaldehyde, glyoxal and glutaraldehyde to which there is grafted formaldehyde and urea. The predominant portion, viz., approximately 95% by wt. of these microcapsules have a particle size less than 1500 microns and more characteristically have a particle size ranging from about 100 to about 400 microns (microcapsular diameter). These microcapsules contain less than approximately 3 wt. % free oil and more characteristically less than about 1 wt. % free oil (non-microencapsulated oil) and have less free (unreacted) formaldehyde, which can be extracted with water, than do prior art microencapsulated oily materials. The microcapsules of this invention are granular and free-flowing when dried.
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patent: 4500358 (1985-02-01), Mayer et al.
patent: 4777089 (1988-10-01), Takizawa et al.
patent: 4795642 (1989-01-01), Cohen et al.
patent: 4832955 (1989-05-01), Snipes et al.
patent: 4844885 (1989-07-01), Chernack
patent: 4892766 (1990-01-01), Jones
Eurand America, Incorporated
Hulina Amy
Molnar Gary R.
Page Thurman K.
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