Oleophobic laminated articles, assemblies of use, and methods
AssigneeDonaldson Company, Inc.
InventorRobert M. Rogers
Life of this patent
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Abstract
An article, such as a filter or film, has a treated laminate with an expanded PTFE membrane and a porous support scrim. The treated laminate is formed by contacting a laminate having an expanded PTFE membrane and a porous support scrim with an oleophobic treatment agent dissolved in an organic solvent. The oleophobic treatment agent is deposited onto the expanded PTFE membrane and porous support scrim as the organic solvent is removed. The oleophobic treatment agent is typically a fluoropolymer. The article can be used, for example, as a filter over a port in a housing of an electronics or other device.
Claims20
An article comprising:
- a treated laminate of an expanded PTFE membrane and a porous support scrim, the treated laminate resulting from
- (i) contacting a laminate of an expanded PTFE membrane and a porous support scrim with an oleophobic treatment agent dissolved in an organic solvent,
- (ii) depositing the oleophobic treatment agent onto the expanded PTFE membrane and porous support scrim, wherein depositing the oleophobic treatment agent comprises removing the organic solvent;
- and
- (iii) heat treating the laminate to orient the oleophobic treatment agent.
A filter comprising:
- a porous treated laminate of an expanded PTFE membrane and a porous support scrim, the porous treated laminate resulting from
- (i) contacting a porous laminate of an expanded PTFE membrane and a porous support scrim with an oleophobic treatment agent dissolved in an organic solvent,
- (ii) depositing the oleophobic treatment agent onto the expanded PTFE membrane and porous support scrim, wherein depositing the oleophobic treatment agent comprises removing the organic solvent;
- and
- (iii) heat treating the laminate to orient the oleophobic treatment agent.
A method of making an article having an oleophobic-treated laminate, the method comprising:
- contacting a laminate of an expanded PTFE membrane and a porous support scrim with an oleophobic treatment agent dissolved in an organic solvent,
- depositing the oleophobic treatment agent onto the expanded PTFE membrane and porous support scrim, wherein depositing the oleophobic treatment agent comprises removing the organic solvent;
- and
- heat treating the laminate to orient the oleophobic treatment agent.
An assembly comprising:
- a housing having a port for air flow;
- and
- a filter disposed over the port, the filter comprising a treated laminate of an expanded PTFE membrane and a porous support scrim, the treated laminate resulting from
- (i) contacting a laminate of an expanded PTFE membrane and a porous support scrim with an oleophobic treatment agent dissolved in an organic solvent,
- (ii) depositing the oleophobic treatment agent onto the expanded PTFE membrane and porous support scrim, wherein depositing the oleophobic treatment agent comprises removing the organic solvent;
- and
- (iii) heat treating the laminate to orient the oleophobic treatment agent.
Dependencies are inferred from the claim text.