Method for stabilizing an engine coolant concentrate and preventing hard water salt formation upon dilution
OwnerPeter M. Woyciesjesinventor
Life of this patent
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Abstract
Disclosed is a stabilized concentrate comprising least one stabilizer selected from the group consisting of polyacrylate polymers of the formula: where R1 is H; R4 is a terminating group; X is and R2 and R3 are each independently hydrogen, an alkali metal or an alkaline earth metal, and the sum of m and n provide a number average equivalent weight of less than 6500, and a number average molecular weight of less than 6500. The concentrate comprises 90 or more wt % freezing point depressant. The stabilized coolant concentrate can be diluted with water to provide a final coolant composition.
Claims19
A coolant concentrate having improved storage stability, the concentrate consisting of:
- at least 90 wt % freezing point depressant, based on the total weight of the coolant concentrate;
- at least one phosphate or the alkali metal or alkaline earth metal salt thereof, and one or more corrosion inhibitors selected from the group consisting of organic acids;
- azole type compounds;
- nitrites, nitrates;
- borates;
- and alkali metal or alkaline earth metal salts thereof;
- at least one stabilizer selected from the group consisting of polyacrylate polymers of the formula:
- where R1 is H;
- R4 is a terminating group;
- X is
- and R2 and R3 are each independently hydrogen, an alkali metal or an alkaline earth metal, and the sum of m and n provide a number average equivalent weight of less than 6500, and
- optionally at least one additive selected from the group consisting of water, antifoam agents, lubricants, colorants, dispersants, anti-scaling agents, wetting agents, surfactants, pH adjusting and buffering agents.
A coolant consisting of:
- a freezing point depressant
- water;
- at least one phosphate or the alkali metal or alkaline earth metal salt thereof, and one or more corrosion inhibitors selected from the group consisting of organic acids;
- azole type compounds;
- nitrites, nitrates;
- borates;
- and alkali metal or alkaline earth metal salts thereof;
- at least one stabilizer selected from the group consisting of polyacrylate polymers of the formula:
- where R1 is H;
- R4 is a terminating group;
- X is
- and R2 and R3 are each independently hydrogen, an alkali metal or an alkaline earth metal, and the sum of m and n provide a number average equivalent weight of less than 6500, and
- optionally at least one additive selected from the group consisting of water, antifoam agents, lubricants, colorants, dispersants, anti-scaling agents, wetting agents, surfactants, pH adjusting and buffering agents.
Dependencies are inferred from the claim text.