Patent · US Expired

Polypropylene molding composition and process for its preparation

US4473687A · kind A · utility

11Cited by

11References

7Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Bernhard Dorrer · Frankfurt am Main, DE
Friedrich Kloos · Mainz, DE
Horst Neumann · Ludwigshafen, DE
Helmut Strametz

Key dates

Filing date	Aug 27, 1982
Grant date	Sep 25, 1984
Priority date	—
Expiry date	Aug 27, 2002

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L2308/00
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A polypropylene molding composition of polypropylene, ethylene-propylene copolymer and polyethylene having a high hardness and increased impact strength and homogeneity after processing is obtained by way of a continuous three-stage polymerization, when the melt viscosities of the polymer mixtures obtained in the individual stages are in a determined ratio of one to the other.

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