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US 6,655,167 B2Granted
Cryogenic comminution of rubber
AssigneeFirst American Scientific Corp.
InventorsCalvin Leslie Kantonen, John Brian Nichols, Philip Coulter
Life of this patent
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Abstract
Rubber chips are immersed in a coolant to cool the chips to a the temperature in the range of −90 degrees to −110 degrees Celsius. The coolant contains alcohol such as n-butyl alcohol, methanol, pentane and is cooled by nitrogen. The cooled chips are then comminuted to a powder in the range of 10 mesh to 100 mesh ASTM in size.
Claims14
A process for the comminution of rubber chips comprising the steps of:
- (a) providing an alcohol-containing coolant comprised of a mixture of n-butyl alcohol and at least one of methanol and pentane maintained at a temperature in the range of −90 to 110° C.;
- (b) contacting said chips with said coolant in order to cool said chips to a temperature within said range;
- and
- (c) comminuting said cooled chips to powder substantially of a size of less than about 10 mesh ASTM.
1 more element
A process for the comminution of rubber chips which pass through a screen having openings of a size within the range of 2 inches to 3 inches, said process comprising the steps of:
- (a) providing an alcohol-containing coolant comprised of a mixture of n-butyl alcohol and at least one of methanol and pentane maintained at a temperature in the range of −90 to −110° C.;
- (b) contacting said chips with said coolant in a cooling chamber to cool said chips to a temperature within said range;
- (c) passing said cooled chips to a comminuting chamber;
- and
- (d) comminuting said cooled chips to a size within the range of 20 mesh to 100 mesh ASTM.
2 more elements
Dependencies are inferred from the claim text.