Preparation of polymer dispersions and photographic elements con

Details Preparation of polymer dispersions and photographic elements con Preparation of polymer dispersions and photographic elements con

1990-05-10

1992-04-14

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524 21, 524 25, 524 43, 524 44, 524 45, 524 47, 524459, 524485, 524503, 524704, C08L 8904, C08L 126, C08L 304, C08L 2904

Patent

active

051049147

ABSTRACT:
It is the object of this invention to provide a method for the preparation of an antiblocking agent which is effective in its antiblocking activity but is considerable less visible in photographic enlargements made from the film containing the antiblock of this invention.
There is described a process for the preparation of monodispersed polymer particles between 5 and 10 microns in diameter which comprises preparing a dispersion of monosized seed polymer particles and then adding to this dispersion an ethylenically unsaturated monomer which is different from the monomer used to prepare the seed polymer particles, together with a polymerization initiator and completing the polymerization, the refractive index of one of the polymers produced being greater than 1.54 and the refractive index of the other polymer being less than 1.54.
The refractive index of gelatin is 1.54. There is produced by the process of the present invention a particle which comprises two polymers. Most preferably one polymer has a refractive index which is as much below 1.54 as the other polymer has a refractive index above 1.54. Preferably the final particles comprises substantially equal amounts of the two polymers.

REFERENCES:
patent: 3070442 (1962-12-01), Cohen et al.
patent: 3926869 (1975-12-01), Horie et al.
patent: 4855219 (1989-08-01), Bagchi et al.
patent: 4861818 (1986-09-01), Timmerman et al.

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