Pearl polymer containing hollow pearls

US4208309A · kind A · utility

Assignee

• Rohm Co., Ltd. · JP

Inventors

• Dieter Kraemer · Mainz, DE
• Hermann Plainer · Reinheim, DE
• Waldemar Schleier · Darmstadt, DE

Key dates

• Filing date: Jun 18, 1979
• Grant date: Jun 17, 1980
• Expiry date: Jun 18, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F220/54
• WIPO field: Biotechnology
• WIPO sector: Chemistry

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.