Pearl polymer containing hollow pearls

Details Pearl polymer containing hollow pearls Pearl polymer containing hollow pearls

1978-05-15

1980-02-26

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

260 8, 521 56, 521150, 521 25, 521 34, 521 38, 435180, C08J 900

Patent

active

041907132

ABSTRACT:
What is disclosed is a pearl polymer product, a method of making the same, and the use thereof as a carrier for biologically active materials, said product being composed of hollow pearl particles having a diameter from 5 to 1000 microns and consisting of a cross-linked polymer which is a cross-linked homopolymer or copolymer comprising at least one member selected from the group consisting of acrylamide, methacrylamide, methylene-bis-acrylamide and methylene-bis-methacrylamide, said polymer containing at least 5 percent by weight of a monomer having at least two carbon-carbon double bonds which are activated by a neighboring phenyl group or carbonyl group, said polymer further being of a composition such that x+3y.gtoreq.40, where x is the percent by weight in the polymer of acrylamide and methacrylamide and y is the percent by weight in the polymer of methylene-bis-acrylamide and methylene-bis-methacrylamide.

REFERENCES:
patent: 3886125 (1975-05-01), Chromecek
patent: 3925267 (1975-12-01), Coupek et al.
patent: 3948866 (1976-04-01), Pennwiss et al.
patent: 3957741 (1976-05-01), Rembaum et al.
patent: 4046720 (1977-09-01), Rembaum et al.
patent: 4070348 (1978-01-01), Kraemer

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