Patent · US Expired

Controlled radical polymerization process using a small amount of stable free radical

US6911511B1 · kind B1 · utility

5Cited by
5References
29Claims
0Family size

Assignee

Inventor

Key dates

Filing dateDec 18, 1998
Grant dateJun 28, 2005
Priority date—
Expiry dateDec 18, 2018

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC08F4/00
  • WIPO fieldMacromolecular chemistry, polymers
  • WIPO sectorChemistry

Abstract

The invention relates to a process for the polymerization of at least one monomer which can be polymerized via a radical route, in the presence of a stable free radical and of a polymerization initiator, such that, per 100 mol of monomer, the molar amounts of stable radical (SFR) and of initiator (INIT) are such that [(SFR)×FSFR]/[(INIT)×FINIT]<0.15 and FSFR×(SFR)<0.2 mol, in which FSFR represents the functionality of the stable free radical and FINIT represents the functionality of the initiator. The process according to the invention has advantageous kinetics, allows the production of grafted or block copolymers and can be carried out in an extruder.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.