Plastic and nonmetallic article shaping or treating: processes – Encapsulating normally liquid material
Patent
1973-12-20
1976-10-12
Lovering, Richard D.
Plastic and nonmetallic article shaping or treating: processes
Encapsulating normally liquid material
71 29, 71 64F, 71 65, 71 94, 252316, 264 41, 264 451, 424 19, 424 33, 424DIG7, B29C 1300
Patent
active
039858405
ABSTRACT:
Microporosity is introduced into a membrane capable of retaining a liquid by (a) forming a single homogeneous liquid phase comprising a first material and a second material, at a temperature above the melting points of said materials, said first material being incompatible with said second material when said liquid phase is cooled to room temperature, the volume contraction ratio being at least about 1.2, and (b) permitting the liquid phase to cool to room temperature, whereby said first material separates out as a dispersed solid phase and creates micropores which extend completely through said membrane. The basic method is used to make capsules by (1) forming the above-mentioned single homogeneous liquid phase into an encapsulating cylindrical stream of liquid concentrically enclosing a core stream of liquid fill material at a temperature below the melting points of the above-mentioned first and second materials, (2) permitting heat exchange to occur, thereby causing said first material to separate out from said homogeneous liquid phase as a multiplicity of microscopic particles dispersed throughout said homogeneous liquid phase, (3) further causing said homogeneous liquid phase to solidify and provide a solid continuous matrix for said particles, while causing said cylindrical stream to constrict and form substantially spherical walls enclosing discrete amounts of said liquid fill material, and (4) hardening said spherical walls into solid microporous capsule walls.
REFERENCES:
patent: 2770571 (1956-11-01), Vance et al.
patent: 3079351 (1964-02-01), Staneslow et al.
patent: 3132074 (1964-05-01), Svedres
patent: 3423489 (1969-01-01), Arens et al.
Lovering Richard D.
Minnesota Mining and Manufacturing Company
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