Poly (meth) acrylamides with improved color stability under thermal stress

US6040387A · kind A · utility

Assignee

• Roehm GmbH Chemische Fabrik · DE

Inventors

• Klaus Albrecht · Mainz, DE
• Werner Hoess · Griesheim, DE
• Hartmut Schikowsky · Darmstadt, DE

Key dates

• Filing date: May 12, 1998
• Grant date: Mar 21, 2000
• Expiry date: May 12, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F8/48
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Molding compositions MC having a reduced tendency to yellow with thermal stress which consist of a polymer PM containing units of formula I: ##STR1## blending from 0.005-1 wt % of at least one reducing inorganic phosphorus compound IP selected from the group consisting of phosphinic and phosphonic acid and its alkali metal, alkaline-earth metal, aluminum and ammonium salts, wherein the ammonium ion can be substituted with up to four C.sub.1 -C.sub.4 alkyl and/or C.sub.5 -C.sub.8 cycloalkyl groups, with the polymer PM after conclusion of the imidation reaction.