Polymers and their production and use as gas hydrate inhibitors

US7893009B2 · kind B2 · utility

Assignee

• Clariant Produkte (Deutschland) GmbH · DE

Inventors

• Dirk Leinweber · Kelkheim, DE
• Michael Feustel · Kelkheim, DE

Key dates

• Filing date: Feb 1, 2006
• Grant date: Feb 22, 2011
• Expiry date: Jun 20, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2208/22
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to polymers with a mean molecular weight of between 500 and 500,000 g/mol that can be produced as follows: A) reaction of a compound of formula 1,in which n stands for 0, 1 or 2 and A for an arbitrarily substituted C1-C40 group with a compound of the formula 2 B(OH)m in which m is from 2 to 10 and B is a represents an arbitrarily substituted C2-C40 group, B) subsequently reaction of the product thus obtained with a nitrogen-containing carboxylic acid which comprises from 1 to 20 carbon atoms, where the molar ratio between the number of free OH groups of the polyester obtained in step A and the nitrogen-containing carboxylic acid is between 1:0.1 and 1:1. The polymers are used to inhibit gas hydrate formation.