Process of preparing microspheres using electromagnetic radiatio

Details Process of preparing microspheres using electromagnetic radiatio Process of preparing microspheres using electromagnetic radiatio

1975-03-28

1978-07-25

Tillman, Murray

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

20415923, C08F 246

Patent

active

041027620

ABSTRACT:
A method of polymerizing a composition comprising a mixture of monomers said monomer mixture containing a major proportion of an unsaturated carboxylic acid and a minor proportion of a crosslinking agent which method comprises irradiating a said mixture of monomers in a nonpolar and nonhydroxylic solvent with electromagnetic radiation having a wavelength greater than 180 nanometers and preferably less than 800 nanometers preferably in the presence of a photosensitive initiator, hereinafter referred to as a sensitizer, at a temperature in the range from 10.degree. C to 90.degree. C, the concentration of unsaturated carboxylic acid being less than 20% w/v, and isolating the polymer so formed.

REFERENCES:
patent: B423404 (1976-03-01), Sasse
patent: 3097096 (1963-07-01), Oster
patent: 3359129 (1967-12-01), Mao
patent: 3814702 (1974-06-01), Bourdon et al.
patent: 3912693 (1975-10-01), Shimizu et al.
patent: 3941724 (1976-03-01), Boltd
patent: 3976629 (1976-08-01), Hayward et al.
patent: 3985632 (1976-10-01), Rembaum et al.
patent: 3990958 (1976-11-01), Sasse

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