Patent · US Expired

Polymer compositions having improved constancy of properties

US6767962B2 · kind B2 · utility

0Cited by

4References

13Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Herbert Eichenauer · Dormagen, DE
Vera Buchholz · Recklinghausen, DE
Eckhard Wenz · Neunburg vorm Wald, DE

Key dates

Filing date	Jul 26, 2002
Grant date	Jul 27, 2004
Priority date	—
Expiry date	Aug 3, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L55/02
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A thermoplastic molding composition that contains a plurality of graft rubbers is disclosed. A first graft rubber is a product of emulsion polymerization of a mixture containing styrene and acrylonitrile in the presence of butadiene polymer latex (A) having an average particle diameter (d50) of 80 to 220 nm. An additional graft rubber is a product of emulsion polymerization of a mixture containing styrene and acrylonitrile in the presence of butadiene polymer latex (B) having an average particle diameter (d50) of 350 to 650 nm. The butadiene polymer latex (A) is the product of seed polymerization in which seed is butadiene polymer latex having a median particle diameter of 10 to 100 nm, and the butadiene polymer latex (B) is the product of agglomeration in which butadiene polymer latex (A) is the starting latex.

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