Expandable protective coating
OwnerChristopher Allen, Phillip Kinner +1inventors
InventorsChristopher Allen, Phillip Kinner, Bethany Grace Turner
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Abstract
The present disclosure is directed to a two-part coating composition, wherein the two-part coating composition comprises: Part A comprising (a) a polyol component comprising at least one of a difunctional polyol, a trifunctional polyol, and a tetra functional polyol; (b) a foam catalyst; (c) optionally, a gel catalyst; and (d) water; and Part B comprising an isocyanate functional material, wherein the isocyanate functionality is at least 2, preferably an isocyanate prepolymer with a functionality of greater than 2 and less than 3. The coating composition produced an expanded closed-cell foam coating that provides protection for electronic substrates operating in harsh environments.
Claims74
A two-part coating composition for coating electronic components, wherein the two-part coating composition comprises:
- a) Part A comprising:
- a. a polyol component comprising at least one of a difunctional polyol, a trifunctional polyol, and a tetra functional polyol;
- b. a foam catalyst;
- c. optionally, a gel catalyst;
- d. optionally, at least one flame retardant;
- and
- e. water;
- and
- b) Part B comprising:
- a. an isocyanate prepolymer with a functionality of greater than 2 and less than 3, and
- b. optionally, at least one flame retardant;
- wherein the flame retardant must be present in at least one of Part A and Part B.
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A method of applying a protective coating to one or more surfaces of an electronic substrate, the method comprising the steps of:
- a) mixing a two-part coating composition comprising:
- i. Part A comprising:
- a. a polyol component comprising at least one of a difunctional polyol, a trifunctional polyol, and a tetra functional polyol;
- b. a foam catalyst;
- c. optionally, a gel catalyst;
- d. optionally, at least one flame retardant;
- and
- e. water;
- and
- ii. Part B comprising:
- a. an isocyanate prepolymer with a functionality of greater than 2 and less than 3, and
- b. optionally, at least one flame retardant,
- wherein the at least one flame retardant must be present in at least one of Part A and Part B, to prepare a liquid coating composition;
- and
- b) applying the liquid coating composition to the electronic substrate and allowing the liquid coating composition to expand into a closed-cell foam coating.
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A method of using a two-part coating composition to repair or modify an electronic substrate having one or more features thereon, the method comprising the steps of:
- a) removing an encapsulating material from the electronic substrate to reveal one or more features thereon;
- b) applying a two-part coating composition to the surface of the electronic substrate having the one or more features thereon, the two-part coating composition comprising:
- i) Part A comprising:
- a. a polyol component comprising at least one of a difunctional polyol, a trifunctional polyol, and a tetra functional polyol;
- b. a foam catalyst;
- c. optionally, a gel catalyst;
- d. optionally, at least one flame retardant;
- and
- e. water;
- and
- ii) Part B comprising:
- a. an isocyanate prepolymer with a functionality of greater than 2 and less than 3, and
- b. optionally, at least one flame retardant,
- wherein the at least one flame retardant must be present in at least one of Part A and Part B, to prepare a liquid coating composition;
- and
- c) allowing the two-part coating composition to expand into a closed-cell foam coating;
- and
- d) optionally, applying a topcoat layer over the expanded closed-cell foam coating, wherein the topcoat layer is selected from the group consisting of chemical resistant coatings, hydrophobic coatings, microencapsulation resins, and combinations of the foregoing.
Dependencies are inferred from the claim text.