Block copolymers
US6069205A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1997 |
| Grant date | May 30, 2000 |
| Priority date | — |
| Expiry date | Oct 3, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2438/01
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is block copolymer of the formulas I and II EQU (PA).sub.x (PB).sub.y X (I) EQU X(PB).sub.y (PA).sub.x (PB).sub.y X (II) wherein PA is an ethylenically unsaturated monomer, and PB is a cationically polymerizable monomer that can be initiated with an alkyl halide or without catalysts, x is 4 to 500,000 and y is from 2 to 500,000 and X is a halogen atom. The present invention also provides a method for making a block copolymer of the formulas I and II EQU (PA).sub.x (PB).sub.y X (I) EQU X(PB).sub.y (PA).sub.x (PB).sub.y X (II) wherein PA is an ethylenically unsaturated monomer, and PB is a cationically polymerizable monomer that can be initiated with an alkyl halide, x is 4 to 500,000 and y is from 2 to 500,000 and X is a halogen atom. The reaction is initiated by an atom transfer radical polymerization of the PA monomer with an initiator to produce a polymer of the formulas (III) or (IV) EQU (PA).sub.x X (III) EQU X(PA).sub.x X (IV) wherein X is a halogen atom. The reaction proceeds by adding the polymer of the formulas (II) or (IV) to monomer (PB) to initiate a cationic polymerization reaction to produce a polymer shown in formulas (I) and (II) above.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.