# US 5,703,271 A · Method of utilizing isocyanate linkage for forming multi-tier cascade polymers

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- Number: US 5,703,271 A
- Document ID: US5703271A
- Status: Granted
- Kind: A
- Application number: 08/626,395
- Filed: 1996-04-02
- Granted: 1997-12-30
- Earliest claimed: 1996-04-02
- Assignees: University of South Florida
- Inventors: George R. Newkome; Claus Weis
- Web page: https://patentgrep.com/patent/US5703271A

## CPC

- C08G 83/003: {Dendrimers}
- C07C 265/04: of a saturated carbon skeleton
- C07C 271/22: to carbon atoms of hydrocarbon radicals substituted by carboxyl groups
- C08G 18/71: Monoisocyanates or monoisothiocyanates
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

A method of synthesizing multitier cascade polymers and the polymers made thereby are formed by reacting at least one tier of a polymer with a functionalized isocyanate having the following formula: O.dbd.C.dbd.N--C(CH.sub.2 --R).sub.3 with R being selected from the group including: --(CH.sub.2).sub.n --CH.sub.2 --COOR' a) with R' being selected from the group consisting of alkyl, cycloalkyl, aryl, heteroaryl- polycycloalkyl, adamantyl, n=0-10; --O--(CH.sub.2).sub.n --CH.sub.2 --COOR' --O--(CH.sub.2).sub.n --CH.sub.2 --CN b) with R' being selected from the group consisting of alkyl (c-1 to C(20), cycloalkyl (C-3 to C-10), aryl heteroaryl, polycycloalkyl, adamantyl, n=0-10; and --CH.sub.2 --(CH.sub.2).sub.n --O--R" c) with n=0-10, R" being selected from the group consisting of alkyl, cycloalkyl, aryl heteroaryl ester functionality, and a sulphur or a silicon atom bearing substituents selected from the group including: ##STR1## wherein R"' is alkyl (C-1 to C-20), cycloalkyl (C-3-C-10), aryl, heteroaryl, polycycloalkyl, adamantyl.

## Claims

### Claim 1

A t-butyl isocyanate monomer of the formula
O.dbd.C.dbd.N--C(CH.sub.2 CH.sub.2 CO.sub.2 tbu).sub.3.