Opaque, microcellular films from latex compositions, process and

Details Opaque, microcellular films from latex compositions, process and Opaque, microcellular films from latex compositions, process and

1971-06-10

1976-04-20

Phynes, Lucille M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 296H, 260 296TA, 260 292R, 260 297H, 260 297T, 260 297GP, 260 336UA, 260 4255, 427331, C08L 910, C08L 1302

Patent

active

039518990

ABSTRACT:
The disclosed invention relates to films from a novel latex mixture which are non-porous, microcellular and opaque in the absence of an opacifying agent. The preparation of the films of the disclosed invention comprises providing control techniques for entrapping a sufficient amount of a liquid non-solvent for the polymer in the polymer matrix of a latex after the continuous phase removal, so that upon evaporation of the non-solvent from a coalesced and tack-free polymer matrix, a resulting opaque and continuous, non-porous film is produced which will have minute, discrete and substantially closed voids and which is opaque in the absence of an opacifying agent such as pigment.
The disclosed invention also relates to opaque films with enhanced optical properties produced by the inclusion of pigments, fluorescent materials and optical brighteners in the opaque films in such a manner as to maximize their effectiveness therein.

REFERENCES:
patent: 2961334 (1960-11-01), Clancy et al.
patent: 3108009 (1963-10-01), Clancy et al .
patent: 3157533 (1964-11-01), Clancy et al.
patent: 3347702 (1967-10-01), Clancy et al.
patent: 3399060 (1968-08-01), Clancy et al.
patent: 3445272 (1969-05-01), Newton
patent: 3504072 (1970-03-01), Ploetz
patent: 3637431 (1972-01-01), Brenneman et al.
patent: 3655129 (1972-04-01), Seiner

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