Controlled release coolant additive composition
AssigneeDober Chemical Corporation
InventorsThomas J. Blakemore, Yu-Sen Chen
Life of this patent
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Abstract
A controlled-release coolant additive composition for use in engine coolant systems comprising a core containing at least one coolant additive component and a polymeric coating encapsulating said core. The controlled released coolant additive composition slowly releases the coolant additive components to an engine coolant system, thereby delivering an effective concentration level of coolant additive components over an extended period. The controlled-release coolant additive composition maintains a minimum concentration level of active coolant additive components in the coolant system.
Claims22
A controlled release coolant additive composition for use in an engine coolant system comprising:
- a core comprising a coolant additive component;
- and
- an insoluble coating substantially surrounding the core, the coating including polymers made up of units derived from vinylacetate and vinylversatate, wherein about 45% to about 90% by weight of the units are derived from vinylacetate and about 10% to about 55% by weight of the units are derived from vinylversatate.
A controlled release coolant additive composition for use in an engine coolant system comprising:
- a core comprising a coolant additive component;
- and
- an insoluble coating substantially surrounding the core, the coating including homopolymers made up of units derived from ethylcellulose in an amount to maintain the insolubility of the coating at temperatures between about 170° F. and 210° F.
A method of maintaining an effective concentration of at least one engine coolant additive component in an engine coolant system comprising introducing into said engine coolant system by circulating at least a portion of the coolant in the cooling system through a coolant filter in which a controlled release coolant additive composition is disposed, said controlled release coolant additive composition comprising:
- a core comprising a coolant additive component;
- and
- an insoluble coating substantially surrounding the core, the coating including polymers made up of units derived from vinylacetate and vinylversatate, wherein about 45% to about 90% by weight of the units are derived from vinylacetate and about 10% to about 55% by weight of the units are derived from vinylversatate.
A controlled release coolant additive composition for use in an engine coolant system comprising:
- a core comprising a coolant additive component;
- and
- an insoluble coating substantially surrounding the core, the coating including polymers made up of units from no more than two monomers, wherein about 10% to about 55% by weight of the units are derived from vinylversatate, and the other units are derived from an ethylenically unsaturated monomer other than vinylversatate.
A controlled release coolant additive composition for use in an engine coolant system comprising:
- a core comprising a coolant additive component;
- and
- an insoluble coating substantially surrounding the core, the coating including polymers made up of units from no more than two monomers, wherein about 45% to about 90% by weight of the units are derived from vinylacetate, and the other units are derived from an ethylenically unsaturated monomer other than vinylacetate.
A controlled release coolant additive composition for use in an engine coolant system comprising:
- a core comprising a coolant additive component;
- and
- an insoluble coating substantially surrounding the core, the coating including polymers made up of units from no more than two monomers, wherein at least about 35% by weight of the units are derived from vinylversatate.
Dependencies are inferred from the claim text.