Hydrophilic N,N-diethyl acrylamide copolymers

Patent 4074039 Issued on February 14, 1978. Estimated Expiration Date:

February 14, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3660545

Inventors

Assignee

Ceskoslovenska akademie ved

Application

No. 05/657602 filed on 02/12/1976

US Classes:

526/306, Plural amide group containing351/160R, Eye contact type523/113, Composition suitable for use as tissue or body member replacement, restorative, or implant523/115, Composition suitable for use as tooth or bone replacement, restorative, or implant524/555, From nitrogen-containing monomer other than acrylonitrile or methacrylonitrile524/565, From acrylonitrile or methacrylonitrile monomer524/566, Inorganic nonreactive material526/307, Non-amide nitrogen containing526/307.2, With monomer containing carboxylic acid amide group526/307.5, Oxygen atom is part of ether or hydroxyl group526/307.7, Oxygen atom is part of ester group derived from unsaturated carboxylic acid602/48, Wound contact layer containing treatment material623/1.49Made of synthetic material

Examiners

Primary: Levin, Stanford M.

Foreign Application Priority Data

1970-03-26 CS

Abstract

There is disclosed a hydrophilic gel suitable for exposure to repeated long-term contact with live tissues or mucous membranes and consisting of macromolecules obtained by polymerizing a mixture of at least two copolymerizable units and a crosslinking agent. The mixture consists of from 52 to 99.5 parts by weight of N,N-diethylacrylamide, 43 to 0.1 parts by weight of a member selected from the group consisting of N,N-dialkyl acrylamide, N-alkyl methacrylamide, nitriles of acrylic and methacrylic acids and from 5 to 0.4 parts by of a divinylic monomer selected from the group consisting of diesters of acrylic acid and methacrylic acid, and methylene or ethylene-bis-methacrylamide or acrylamide.