Claims
- 1. A method of improving the flow properties of paraffin-containing oils comprising the step of adding to said oil a copolymer comprising 50 to 99.9% by weight of at least one recurring structural element of the formula I ##STR6## in which R.sup.1 and R.sup.2 independently of one another are hydrogen, phenyl or a group of the formula COOR.sup.4,
- R.sup.3 is hydrogen, methyl or a group of the formula CH.sub.2 COOR.sup.4, or R.sup.2 and R.sup.3 together are C.sub.4 - to C.sub.7 -alkylene, and R.sup.4 is hydrogen, C.sub.8 - to C.sub.40 -alkyl or C.sub.8 -C.sub.40 -alkenyl with the proviso that recurring structural elements of the formula I contain at least one and not more than two carboxylic acid units of the formula COOR.sup.4 or CH.sub.2 COOR.sup.4 in one recurring structural element, and 0.1 to 50% by weight, of at least one recurring structural element of the formula II ##STR7## in which R.sup.5 is hydrogen or methyl,
- Z is C.sub.1 - to C.sub.3 - alkyl,
- R.sup.6 is hydrogen, C.sub.1 - to C.sub.30 -alkyl, cycloalkyl, aryl or --C(O)--R.sup.8,
- R.sup.7 is hydrogen or C.sub.1 - to C.sub.30 -alkyl, C.sub.3 - to C.sub.30 -alkenyl, cycloalkyl or aryl and
- m is a number from 1 to 60.
- 2. A method as claimed in claim 1, wherein in said copolymer, R.sup.1 and R.sup.2 independently of one another are hydrogen or COOR.sup.4,
- R.sup.4 is C.sub.10 - to C.sub.24 -alkyl,
- R.sup.6 is hydrogen or methyl,
- R.sup.7 is hydrogen or methyl and
- R.sup.8 is C.sub.1 - to C.sub.22 -alkyl or phenyl.
- 3. A method as claimed in claim 1, wherein
- R.sup.1 and R.sup.2 are hydrogen,
- R.sup.3 is hydrogen or methyl and
- R.sup.6 is hydrogen.
- 4. A method of improving the flow properties of a paraffin-containing oil comprising the step of adding to said oil a composition comprising 10 to 90% by weight of a copolymer as claimed in claim 1 and 10 to 90% by weight of a polyacrylic acid C.sub.8 -C.sub.24 -alkyl ester.
- 5. A method of improving the flow properties of a paraffin-containing oil comprising the step of adding to said oil a composition comprising 10 to 90% by weight of a copolymer as claimed in claim 1 and 10 to 90% by weight of an aromatic solvent.
- 6. A method as claimed in claim 1, wherein said copolymer comprises 70 to 99.9% by weight of at least one said recurring structural element of the formula I and 0.1 to 30% by weight of at least one said recurring structural element of the formula II.
Priority Claims (1)
Number |
Date |
Country |
Kind |
41 23 795.1 |
Jul 1991 |
DEX |
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Parent Case Info
This application is a divisional application of Ser. No. 07/914,773, filed Jul. 15, 1992, which is now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (9)
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481657 |
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CAX |
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EPX |
1 225 980 |
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FRX |
57-202311 |
Dec 1982 |
JPX |
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GBX |
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1368729 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
914773 |
Jul 1992 |
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