Stock material or miscellaneous articles – Composite – Of metal
Reexamination Certificate
2000-03-23
2001-09-11
Woodward, Ana (Department: 1711)
Stock material or miscellaneous articles
Composite
Of metal
C428S458000
Reexamination Certificate
active
06287702
ABSTRACT:
FIELD OF THE INVENTION
This invention is in the field of melt-fabricable fluoropolymers, and is specifically concerned with melt-fabricable fluoropolymer compositions having enhanced properties.
BACKGROUND OF THE INVENTION
Fluoropolymer resins, and especially perfluoropolymer resins, are known for their low surface energy and antistick properties and thermal and chemical resistance. These copolymers do not stick to other materials, especially dissimilar materials, with any practical degree of bond strength.
Some high temperature resistant thermoplastics (HTRP), such as polyamide imide, polyarylene sulfide and polyether sulfone, have found use as adhesion promoters in fluoropolymer coating formulations. See, for example U.S. Pat. No. 5,230,961 (Tannenbaum) and U.S. Pat. No. 5,093,403 (Rau et al.). While liquid crystal polymers (LCP) have been included in HTRP groupings for other purposes, LCP are not known as adhesion promoters. While LCP can exhibit some adhesion to metal in the neat (undiluted) state, such adhesion is much less than exhibited by the recognized HTRP adhesion promoters.
There remains a need for melt-flowable fluoropolymer with improved adhesion to dissimilar materials but which substantially retains the thermal and chemical resistance of fluoropolymer.
SUMMARY OF THE INVENTION
This invention provides a melt-fabricable fluoropolymer composition comprising minor amounts of functionalized fluoropolymer and liquid crystal polymer, and a major amount of non-functional fluoropolymer. The composition exhibits synergistic enhanced adhesion to metal, enabling one to use relatively low concentrations of liquid crystal polymer to achieve adhesion, so that the composition has predominantly fluoropolymer character. Heretofore, liquid crystal polymer has not been known as an adhesion promoter.
In a further embodiment, the invention provides a laminate of metal and the melt-fabricable composition of the invention adhered thereto.
REFERENCES:
patent: 5093403 (1992-03-01), Rau et al.
patent: 5230961 (1993-07-01), Tannenbaum
patent: 6114441 (2000-09-01), Spohn et al.
patent: 0 626 424 A1 (1993-12-01), None
patent: 0 709 428 A1 (1995-04-01), None
patent: 0 728 776 A1 (1995-06-01), None
patent: 0 761 757 A1 (1996-08-01), None
E. I. Du Pont de Nemours and Company
Woodward Ana
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