Patent ID: 11965140
Assignee: EVONIK OPERATIONS GMBH
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  Y | IPC C

Claim 14:
15. A process for preparing at least one polyalkyl acrylate, the process comprising:
(i)charging a reaction vessel with a base oil;
(ii) heating the base oil of (i) to a reaction temperature of 130° C. to 170° C.;
(ii) constantly feeding a mixture of at least one branched C8-10-alkyl acrylate and 0.1 to 1.2% of an initiator, based on an amount of the at least one branched C8-10-alkyl acrylate, to the reaction vessel over a time of 120 to 240 minutes, to obtain a reaction mixture;
(iv) optionally, stirring the reaction mixture obtained under (iii) for another 50 to 90 minutes, and
(v) cooling the reaction mixture obtained under (iv) to an ambient temperature and obtaining the at least one polyalkyl acrylate;
wherein the at least one polyalkyl acrylate comprises:
(a) 95 to 100% by weight of the at least one branched C8-10-alkyl acrylate, and
(b) 0 to 5% by weight of at least one C1-20-alkyl (meth)acrylate,
wherein a weight-average molecular weight of the at least one polyalkyl acrylate is in the range of 7,000 to 25,000 g/mol and a residual monomer content is 0.1% by weight or lower.