Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Heterocyclic ring compound; a heterocyclic ring is one...
Reexamination Certificate
1998-04-03
2001-05-29
Medley, Margaret (Department: 1714)
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Heterocyclic ring compound; a heterocyclic ring is one...
C508S506000, C508S591000, C148S029000
Reexamination Certificate
active
06239082
ABSTRACT:
FIELD OF INVENTION
The present invention relates to quench oils used in the heat treatment of metals, especially steel.
BACKGROUND OF INVENTION
Petroleum oils used in the rapid cooling of heated metals such as steel often include quench speed accelerators. In use, the oil and accelerators generally thermally decompose. Some result in the formation of sludge which gives a poor appearance to the metal part and requires replenishing the oil. Thus, there is a need for improved quench oils that are highly detergent and highly stable.
SUMMARY OF INVENTION
It now has been discovered that a unique combination of quench speed accelerators in a base quench oil when used for rapid cooling of heated metal parts results in parts that not only have improved appearance but also improved metallugical consistency such as hardness and machineability. Thus, in one embodiment there is provided a quench oil for high speed cooling of heated metals comprising a major amount of a base oil having a minimum flash point of about 120° C. and a quench rate acceleration amount of an additive containing (a) a polymer or copolymer having alkylene groups, and (b) a succinic acid or succinic anhydride functionalized polymers and copolymers having alkylene groups.
This and other embodiments will become apparent from a reading of the detailed description which follows:
DETAILED DESCRIPTION OF INVENTION
The quench oil of the present invention comprises a base quench oil which may be any natural or synthetic oil that has a minimum flash point of about 120° C. Especially useful are solvent refined or hydrotreated petroleum base stocks having a viscosity between 5 and 100 cSt at 40° C. Illustrative of such a base oil is one sold by Imperial Oil of Canada as IOL 100N20 and which is a solvent refined paraffinic base stock.
The quench oil also includes a quench speed accelerator additive system containing (a) a polymer or copolymer having alkylene groups and (b) a succinic acid or succinic anhydride functionalized polymer or copolymer having alkylene groups.
Component (a) above may be any alkylene containing polymer or copolymer that thermally decomposes cleanly at high temperatures. Examples of such polymers include poly(iso)alkylenes and copolymers thereof with styrene. In general these polymers will have a number average (Mn) molecular weight in the range of about 300 to greater than 5000, and preferably about 2500. Especially preferred is poly(iso)butylene.
Component (b) may be any succinic acid or succinic anhydride functionalized alkylene containing polymer or copolymer that decomposes cleanly at high temperatures. Among the functionalized polymers and copolymers are functionalized poly(iso) alkylenes and functionalized copolymers of (iso)alkylenes and styrene. Generally polymers with a Mn of from about 300 to 3000 and higher are useful with molecular weight in the range of 900 to 1300 being preferred. Especially preferred is poly(iso)butylene succinic anhydride and poly(iso)butylene succinic acid.
Components (a) and (b) are added to the base oil in an amount sufficient to accelerate the quench speed of the base oil. Preferably components (a) and (b) are added in an amount sufficient to provide an “IVF quench speed” of about 9 seconds or faster. The IVF quench speed is the time it takes to cool a probe heated to 850° C. to 500° C. Typically component (a) will be used in amounts from about 1.5 to about 12 vol % based on the total volume of the composition and preferably from about 4.5 to 7.5 vol %. Component (b) will be used in amounts of from about 0.05 vol % to about 4.5 vol % and preferably from 0.5 to about 1.5 vol %, based on the total volume of the composition. The ratio of (a):(b) will be in the range of about 0.25 to about 150.
As will be appreciated, components (a) and (b) may be contained in a liquid carrier. Nonetheless, the amounts referred to above are the actual amounts of the components added to the base oil.
REFERENCES:
patent: 2340724 (1944-02-01), Horst
patent: 3489619 (1970-01-01), Brewster
patent: 3567640 (1971-03-01), Stroh
patent: 3855014 (1974-12-01), De Vries et al.
patent: 5250122 (1993-10-01), Uchida et al.
patent: 5376186 (1994-12-01), Uchida et al.
patent: 178354 (1986-04-01), None
patent: 60-04597 (1985-01-01), None
patent: 61-268794 (1986-11-01), None
Gerow Gerald Keith
Hewson William Donald
Allocca Joseph J.
Exxon Research and Engineering Company
Medley Margaret
Toomer Cephia D.
LandOfFree
Petroleum quench oil does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Petroleum quench oil, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Petroleum quench oil will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2462791