Copolymers based on maleic anhydride and .alpha., .beta.-unsaturated compounds a process for their preparation and their use as paraffin inhibitors

US4670516A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gunter Sackmann · Leverkusen, DE
• Jan Mazanek · Cologne, DE
• Wolfgang Oberkirch · Leverkusen, DE
• Herbert Bartl · Odenthal, DE

Key dates

• Filing date: Feb 11, 1985
• Grant date: Jun 2, 1987
• Expiry date: Feb 11, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10L1/2364
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The new copolymers based on maleic anhydride and .alpha.,.beta.-unsaturated compounds contain, as bivalent structural units, PA1 A: 20 to 95 mole % of the structural element ##STR1## B: 0 to 40 mole % of the structural element ##STR2## C: and 0 to 40 mole % of the structural element ##STR3## the sum of the mole percents of (A), (B) and (C) being 100, and wherein R.sup.1 and R.sup.2 are identical or different and denote hydrogen, alkyl, optionally substituted aryl or the ester group ##STR4## in which R.sup.4 represents alkyl with 1 to 20 carbon atoms, PA1 R.sup.3 denotes an alkyl, cycloalkyl or optionally substituted aryl radical with 1 to 20 carbon atoms and PA1 X and Y are identical or different and represent the group EQU --O--R.sup.5 PA0 in which PA1 R.sup.5 denotes hydrogen, a cation or alkyl with 1 to 40 carbon atoms, or PA1 X and Y represent the group EQU --NHR.sup.3 PA0 in which R.sup.3 has the abovementioned meaning, at least one of the radicals X and Y representing the group --O--R.sup.5, and at least one of the radicals in the radicals X and Y containing at least 18 carbon atoms. The new copolymers can be prepared by reacting alternating copolymers of maleic anhydride and…