Method of producing and using materials which are reinforced against impact and which contain block copolymers that are obtained by means of controlled radical polymerization in the presence of nitroxides
US8013062B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 2003 |
| Grant date | Sep 6, 2011 |
| Priority date | — |
| Expiry date | May 31, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L101/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to the production and use of block copolymers which are obtained by means of controlled radical polymerization in the presence of nitroxides for the purpose of reinforcing fragile polymer matrices. The invention offers advantages such as (i) simplicity of copolymer synthesis and use and (ii) fine dispersion of the copolymer molecules in the fragile matrix, which ensures both the transparency of the material and high reinforcement against impact. More specifically, the invention relates to the radical synthesis of block copolymers comprising at least three blocks, which include one block having a glass transition temperature of less than 0° C. and a thermoplastic end block having a glass transition temperature of more than 0° C., thereby guaranteeing compatibility with the fragile matrix to be reinforced against impact.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.