08-12-2010 дата публикации
Номер: CN0101910218A
Принадлежит:
The invention pertains to the synthesis and use of copolymers based on ethylene and/or propylene and vinyl ester(s) which are modified by grafting and are effective for enhancing both the low-temperature resistance and the lubricity of liquid hydrocarbons, more particularly the middle distillates obtained from the distillation of petroleum and crude oils, especially those with a low sulfur content, and relates to a copolymer comprising: a) units derived from ethylene, of formula A -(CH2-CH2)nl- and/or from propylene, of formula A' -((CH3)CH2-CH2)n2-, with n1 + n2 = n ranging from 98 to 643, preferably ranging from 124 to 515; n1 being advantageously equal to n; b) units of formula B: -(CH2-CHOOCR1)m-x- in which R1 represents a linear or branched C1-C15 alkyl group, preferably methyl or propyl, or a C5 to Cl5 branched alkyl group in which the branching is located at any point of the alkyl radical, preferably in position 2 or 3 of the alkyl chain; and preferably selected from the preferred ...
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