Patent · US Expired

Manufacture of high impact and translucent styrene polymers

US4282334A · kind A · utility

23Cited by

2References

7Claims

0Family size

Assignee

BASF SE

Inventors

Manfred Walter · Nuremberg, DE
Dieter Stein
Gerhard Fahrbach
Rudolf H. Jung · Worms, DE
Adolf Echte · Ludwigshafen, DE

Key dates

Filing date	Nov 27, 1979
Grant date	Aug 4, 1981
Priority date	—
Expiry date	Nov 27, 1999

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F279/02
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for the manufacture of high impact and translucent polystyrene, in which, in a first stage, styrene is prepolymerized in mass or in solution in the presence of a rubber, and the polymerization is then completed in mass, in solution or in aqueous suspension. The prepolymerization is taken to a stage where the amount of styrene converted is from 3 to 10 times the amount of the elastomer constituent of the rubber, and at this conversion the disperse soft-component phase formed should have a mean particle size of less than 1 .mu.m and should contain from 35 to 65% by weight of free or chemically bonded polystyrene segments. The translucent styrene polymers of high impact strength may be used for packaging purposes.

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