Process for preparing hydrogels as spherical beads of large size

Details Process for preparing hydrogels as spherical beads of large size Process for preparing hydrogels as spherical beads of large size

1978-06-01

1980-09-23

Briggs, Sr., Wilbert J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

525 10, 525440, 525920, 526172, 526234, 526279, 526321, 525424, 525455, 525925, 525404, 525426, 525445, 525479, 525921, 526226, 526259, 526317, 526909, 526221, 526227, 526237, 526260, 526303, 526320, 526332, 526910, C08F 218

Patent

active

042244277

ABSTRACT:
The disclosure describes an improved process for the preparation of uniform, spherical beads of up to 5 mm diameter of a crosslinked, water-insoluble hydrogel by suspension polymerization in a concentrated aqueous salt solution of 95-30% by weight of a monoolefinic water-soluble monomer containing at least 5% of a hydroxy substituted hydrophilic vinyl monomer with 5-70% by weight of a terminal diolefinic macromer crosslinking agent in the presence of water-insoluble, gelatinous, strong water-bonding inorganic metal hydroxides as suspending agents in the absence of excess alkali. The hydrogels have a host of pharmaceutical and industrial uses.

REFERENCES:
patent: 2801992 (1957-08-01), Hutchinson et al.
patent: 3509234 (1970-04-01), Burlant et al.
patent: 3557061 (1971-01-01), Hamann
patent: 3641199 (1972-02-01), Niederhauser et al.
patent: 3716505 (1973-02-01), Ohe et al.
patent: 3829531 (1974-08-01), Graff
patent: 3996308 (1976-12-01), Douek et al.
patent: 4034017 (1977-07-01), Chang et al.
patent: 4041104 (1977-08-01), Selley

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