Hydraulic fluids based on two centistoke synthetic hydrocarbons

Compositions – Heat-exchange – low-freezing or pour point – or high boiling... – Organic components

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252 327E, 252 515A, 252 74, 252 76, 585 10, 585255, C10M 312, C07C 274

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045376964

ABSTRACT:
Highly useful hydraulic fluids based on synthetic hydrocarbon basestocks and having improved low temperature properties, good shear stability, and capable of substantially meeting the rigid Denison HF-O standards are provided. The products of this invention are comprised of specific proportions of a two centistoke synthetic hydrocarbon oil obtained from the oligomerization of alpha-olefins, particularly 1-decene, specific polymethacrylate viscosity index improvers, and a zinc-based universal/multifunctional additive package. The hydraulic fluids have a maximum viscosity of 1400 centistokes at -40.degree. F. and minimum viscosity of 5.5 centistokes at 210.degree. F.

REFERENCES:
patent: 3450636 (1969-06-01), Rausch
patent: 3742082 (1973-06-01), Brennan
patent: 3763244 (1973-10-01), Shubkin
patent: 4032591 (1977-06-01), Cupples et al.
patent: 4101427 (1978-07-01), Shaub
Hatton, Introduction to Hydraulic Fluids, Reinhold Publishing Corp., New York, 1962, Chapter 6, p. 171.

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