Patent · US Active

Partly neutralised anionic (meth) acrylate copolymer

US8431157B2 · kind B2 · utility

1Cited by

5References

16Claims

0Family size

Assignee

Evonik Röhm GmbH · DE

Inventors

Rosario Lizio · Dieburg, DE
Hans-Ulrich Petereit · Darmstadt, DE
Erna Roth · Darmstadt, DE
Michael Damm · Rödermark, DE
Ruediger Alexowsky · Nauheim, DE

Key dates

Filing date	Dec 15, 2005
Grant date	Apr 30, 2013
Priority date	—
Expiry date	Jan 16, 2029

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F220/1802
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

The invention relates to a partly neutralized anionic (meth)acrylate copolymer consisting of radically polymerized units containing 25-95% by weight (meth)acrylic acid C1 to C4 alkylesters and 5-75% by weight (meth)acrylate monomer with an anionic group, wherein 0.1 to 25% contained anionic groups are neutralized by a base. Said invention is characterized in that said base is embodied in the form of an cationic organic base whose molecular weight is greater than 150. A medical form containing said partly neutralized anionic (meth)acrylate copolymer and the use of said partly neutralized anionic (meth)acrylate copolymer for producing a medical form rapidly releasing an active substance having a determined pH value are also disclosed.

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