Coatings and methods for particle reduction
Assignee3M Innovative Properties Company
InventorsJason M. Kehren, Patricia M. Savu
Life of this patent
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Abstract
The present disclosure relates to high purity apparati, e.g., magnetic hard disk drives, and more specifically, to coatings for particle reduction of surfaces of such apparati. The provided coatings include thin polymer coatings with reactive pendant groups having crosslinking functionality and ability to anchor to substrate surfaces to suppress particle shedding from substrate surfaces. Provided is a substrate that includes a coating on at least a portion of the substrate that comprises a fluorinated acrylate random copolymer. Methods of reducing particulate contamination are also provided.
Claims19
A substrate comprising a coating on at least a portion of said substrate wherein said coating comprises a fluorinated acrylate random copolymer having the following general formula:
- XAwBxCyDzT
- where
- X is the initiator residue or hydrogen,
- A represents units derived from one or more divalent fluorochemical acrylate monomers,
- B represents units derived from one or more divalent acrylate monomers with a functional group,
- C represents units derived from one or more non-fluorinated divalent acrylate monomers with a hydrocarbon group,
- D represents units derived from one or more curatives,
- T represents a functional terminal group or X defined as above,
- w is an integer from 1 up to about 200,
- x is an integer from 1 up to about 300,
- y is an integer from 1 up to about 100, and
- z is an integer from 0 up to about 30, and
- wherein C is selected from the group consisting of monomers whose homopolymer has a glass transition temperature of −45° C. or lower.
A method of reducing particulate contamination comprising:
- providing at least one of a hard disk drive assembly, a MEMS device, a process equipment for electronics or a printed circuit card assembly;
- and
- applying a coating on at least a portion of the assembly of at least one of a hard disk drive assembly, a MEMS device, a process equipment for electronics or a printed circuit card assembly,
- wherein the coating comprises a fluorinated acrylate random copolymer having the following general formula:
- XAaBbCcDdTe
- where
- X is the initiator residue or hydrogen,
- A represents units derived from one or more divalent fluorochemical acrylate monomers,
- B represents units derived from one or more divalent acrylate monomers with a functional group,
- C represents units derived from one or more non-fluorinated divalent acrylate monomers with a hydrocarbon group,
- D represents units derived from one or more curatives,
- T represents a functional terminal group or X defined as above,
- a+b+c+d+e=1, 0.20≦a≦0.90, 0.05≦b≦0.25, 0.05≦c≦0.65, 0.0005≦d≦0.03, and 0.0025≦e≦0.20,
- wherein a, b, c, d, and e are weight percentages of A, B, C, D, and T, respectively, and
- wherein C is selected from the group consisting of monomers whose homopolymer has a glass transition temperature of −45° C. or lower.
Dependencies are inferred from the claim text.