Patent · US Expired

Bound antioxidant masterbatches

US4956410A · kind A · utility

4Cited by

6References

11Claims

0Family size

Inventors

Gerald Scott · Somerville, US
Sahar Al-Malaika · Dudley, GB
Abdul Ibrahim · Birmingham, GB

Key dates

Filing date	Jul 7, 1989
Grant date	Sep 11, 1990
Priority date	—
Expiry date	Jul 7, 2009

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08K5/3435
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for preparing a bound antioxidant polymer concentrate is described which comprises grafting one or more acrylic or alkylacrylic esters or amides containing a hindered-amine group onto the polymer in the presence of a radical generator at a temperature of 100.degree. to 350.degree. C., the molar ratio of said radical generator to said ester or amide being from 0.001: to 1:1, the reaction being continued for a time such that the melt viscosity of the polymer which increases initially during the reaction has reduced to a level which permits the concentrate to be homogeneously blended subsequently into a unstabilized polymer.

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