US 11,718,806 B2
Transformer oil basestock and transformer oil composition comprising the same
Ronald R. Hill, Jr., Humble, TX (US); Caterina T. H. Tran, Houston, TX (US); Andrew P. Broenen, Houston, TX (US); Shaival R. Mehta, Katy, TX (US); and Daniel X. Bien, Brussels (BE)
Assigned to ExxonMobil Chemical Patents Inc., Baytown, TX (US)
Appl. No. 16/641,893
Filed by ExxonMobil Chemical Patents Inc., Baytown, TX (US)
PCT Filed Sep. 10, 2018, PCT No. PCT/US2018/050182
§ 371(c)(1), (2) Date Feb. 25, 2020,
PCT Pub. No. WO2019/051363, PCT Pub. Date Mar. 14, 2019.
Claims priority of provisional application 62/556,571, filed on Sep. 11, 2017.
Claims priority of application No. 18160969 (EP), filed on Mar. 9, 2018.
Prior Publication US 2020/0199474 A1, Jun. 25, 2020
Int. Cl. C10M 101/02 (2006.01); C10M 169/04 (2006.01); C09D 7/63 (2018.01); C09D 11/36 (2014.01); C09J 11/06 (2006.01); C09K 5/10 (2006.01); C09K 8/035 (2006.01); C10G 5/00 (2006.01); C10N 20/00 (2006.01); C10N 30/00 (2006.01); C10N 30/02 (2006.01); C10N 30/10 (2006.01); C10N 30/14 (2006.01); C10N 30/16 (2006.01); C10N 40/14 (2006.01)
CPC C10M 101/02 (2013.01) [C09D 7/63 (2018.01); C09D 11/36 (2013.01); C09J 11/06 (2013.01); C09K 5/10 (2013.01); C09K 8/035 (2013.01); C10G 5/00 (2013.01); C10M 169/04 (2013.01); C10G 2300/1074 (2013.01); C10G 2300/301 (2013.01); C10G 2300/302 (2013.01); C10G 2300/304 (2013.01); C10G 2300/308 (2013.01); C10G 2400/30 (2013.01); C10M 2203/1045 (2013.01); C10M 2203/1065 (2013.01); C10M 2203/1085 (2013.01); C10M 2207/023 (2013.01); C10N 2020/015 (2020.05); C10N 2020/017 (2020.05); C10N 2030/02 (2013.01); C10N 2030/10 (2013.01); C10N 2030/14 (2013.01); C10N 2030/16 (2013.01); C10N 2030/28 (2020.05); C10N 2040/14 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A transformer oil composition, comprising:
a basestock comprising at least 99 wt % of naphthenes and isoparaffins as determined by GC-FID, and less than or equal to 1 wt % total aromatics, as measured by ASTM D7419, based on the total weight of the transformer oil basestock, wherein:
the weight ratio of the naphthenes to the isoparaffins is from 1.2 to 4.0, as measured by GC-MS,
the basestock has a viscosity index (VI) of 80-100, as calculated based on ASTM D2270;
the basestock has an initial boiling point (IBP) of at least 280° C. and a final boiling point (FBP) of at most 380° C.,
the basestock has a distillation range as defined by (FBP-IBP) of at most 100° C., a distillation range as defined by (T90−T10) of at most 60° C., as measured by ASTM D86; and
the basestock has a flash point of at least 145° C., as measured by ASTM D92;
an anti-gassing agent; and
an antioxidant.