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US 2025/0011637 A1Published application
Ethylene vinyl acetate-based dispersions suitable as pour point depressants with improved performance and stability
AssigneeEvonik Operations GmbH
InventorsSofia SIRAK, Alisa BORGER, Jasmin MEURER, Claudia Meister, Gaël MOSNIER, Johannes RIEGER, Ines BERWING, Marie-Christin WINKLER
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Abstract
The invention relates to new ethylene vinyl acetate-based polymer dispersions with increased stability compared to state-of-the-art and to a preparation process thereof. The invention also relates to a method for inhibiting wax deposition and reducing the pour point, viscosity and yield stress of crude oils by treating the crude oils with these stable ethylene vinyl acetate-based polymer dispersions.
Claims14
A dispersion comprising the following components:
- A) at least one graft copolymer A),
- wherein the graft copolymer A) is obtainable by grafting onto an ethylene-based copolymer having a weight-average molecular weight of 2,000 to 150,000 g/mol and consisting of 60 to 70% by weight of ethylene and 30 to 40% by weight of vinyl acetate, based on the total weight of the ethylene-based copolymer,
- a composition of monomers a) comprising:
- a1) alkyl (meth)acrylates of general formula (I)
- wherein
- R is H or CH3 and
- R1 is a linear or branched, saturated or unsaturated alkyl group with 1 to 30 carbon atoms,
- and
- a2) hydroxy esters of general formula (II)
- wherein
- R is H or CH3 and
- A is a branched or unbranched, aliphatic C1 to C4 carbon-based group
- B) at least one ethylene-based copolymer B) obtainable by polymerizing a monomer composition consisting of
- b1) 55% to 85% by weight of ethylene, and
- b2) 15% to 45% by weight of a vinyl acetate, based on the total weight of the ethylene-based copolymer B),
- and
- C) a carrier medium.
14 more elements
Dependencies are inferred from the claim text.