摘要:
Polymer blends contain a) from 10 to 90% by weight of an imide of a copolymer based on an .alpha.-olefin and on an ethylenically unsaturated dicarboxylic acid and a polyamine and b) from 10 to 90% by weight of a copolymer which differs from a) and contains at least two monomers selected from the group consisting of ethylene, acrylates, vinyl esters, vinyl ethers and ethylenically unsaturated dicarboxylic acids or dicarboxylic acid derivatives, and are used as additives for mineral oil middle distillates.
摘要:
Water is separated from crude oil by a process in which the oil demulsifier used is a mixture of A) compounds which have demulsifying activity and are of the structure type of the (a) polyethyleneimine alkoxylate, (b) mono- or oligoamine alkoxylate, (c) alkoxylated alkylphenol/formaldehyde resins, (d) alkoxylated amine-modified alkylphenol/formaldehyde resins, (e) co- or terpolymers of alkoxylated acrylates or methacrylates with vinyl compounds, (f) condensates of mono- or oligoamine alkoxylates, dicarboxylic acids and alkylene oxide block copolymers, where these condensates may furthermore be completely or partially quaternized at the nitrogen atoms, or (g) compounds (a) to (f) reacted with crosslinking agents and B) as a demulsifying assistant, a polyalkylene glycol ether which has no demulsifying activity and is of the general formula I or II R.sup.1 �(OA.sup.1).sub.a --OH!.sub.n (I) H--(OA.sup.1).sub.b --(OA.sup.2).sub.c --(OA.sup.3).sub.d --OH(II) where R.sup.1 is a monovalent to decavalent C.sub.1 -C.sub.20 alkyl group, phenyl group or alkylphenyl group where the alkyl radical is of 1 to 20 carbon atoms, A.sup.1 to A.sup.3 are each a 1,2-alkylene group of 2 to 4 carbon atoms or a phenylethylene group, n is from 1 to 10, a is from 1 to 50 and b, c and d are each from 0 to 50, the sum b+c+d being greater than 3.
摘要:
An ethylene-based copolymer which is suitable as a flow improver for mineral oil middle distillates and is composed of a) from 50 to 94% by weight of ethylene; b) from 3 to 30% by weight of one or more vinyl esters of C.sub.2 -C.sub.6 -monocarboxylic acids; c) from 3 to 20% by weight of one or more aminoalkyl acrylates of the formula I ##STR1## which R.sup.1 is hydrogen or methyl, R.sup.2 and R.sup.3 are identical or different and are each hydrogen or C.sub.1 -C.sub.6 -alkyl and A.sup.1 is straight-chain or branched C.sub.2 -C.sub.10 -alkylene; and d) from 0 to 10% by weight of one or more monomers which are copolymerizable with the monomers a) to c), wherein copolymers containing vinyl acetate as monomer b) and having a number average molecular weight of from 5,000 to 50,000 are excluded from the scope of the copolymer.