| 摘要 |
Copolymers of alkyl acrylates or alkyl acrylates/vinylpyridine of molecular wt. (Mw) 5000 - 500000 (preferably 40000 - 350000), the monomer motifs of which correspond to -(-CH2-C(R)(C(O)ORi)-)- (I) where R = H or Me, Ri = residues of a linear saturated alcohol RiOH and i is the number of C atoms ranging from 10 - 50C, and which conforms to a distribution law U in which the i's are even numbers developed over the upper part of the range (24 - 50), the centre value being iu, and a distribution non-U where the i's are even or odd numbers over the lower part of the range (10-22) with a central value inu, such that inu is less than iu. The wt. ratio of the assemblage of motifs (I) distributed according to U to the non-U distribution is from 1:99 to 50:50 (preferably 5:95 to 50:50). Also claimed is the procedure for obtaining the copolymers, additive compositions containing the copolymers and crude oil compositions containing the copolymers.
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