In-situ preparation of polyaspartic ester mixtures

US6790925B2 · kind B2 · utility

Assignees

• Bayer Polymers LLC · US
• BAYER HEALTHCARE LLC · DE

Inventors

• Karsten Danielmeier · Solingen, DE
• Catherine M. Britsch · Pittsburgh, US
• Rolf Gertzmann · Leverkusen, DE
• Michele E. Vargo · Pittsburgh, US
• Terrell D. Wayt · Moundsville, US
• Edward P. Squiller · Pittsburgh, US
• Richard R. Roesler · Wexford, US

Key dates

• Filing date: Dec 5, 2002
• Grant date: Sep 14, 2004
• Expiry date: Dec 28, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G73/1092
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to polyaspartate mixtures containinga) 5 to 50 equiv. %, based on the total equivalents of aspartate groups, of a polyoxypropylene polyaspartate corresponding to the formula wherein X1 represents the residue obtained by removing the amino groups from a polyoxypropylene polyamine having a functionality of n, R1 and R2 are identical or different and represent organic groups which are inert to isocyanate groups at a temperature of 100° C. or less, R3 and R4 are identical or different and represent hydrogen or organic groups which are inert towards isocyanate groups at a temperature of 100° C. or less and n is 2 to 4, andb) 50 to 95 equiv. %, based on the total equivalents of aspartate groups, of a polyether polyaspartate corresponding to the formula I wherein X1 represents the residue obtained by removing the amino groups from a polyether polyamine having a functionality of n and a number average molecular weight of less than 5000, wherein the amino groups are attached to primary carbon atoms and the ether groups are separated by at least two carbon atoms. The present invention also relates to a process for preparing these polyaspartate mixtures a…