Polyetherimide resins with very low levels of residual contamination
View Patent ↗Compositions and methods for producing compositions comprising a monoamine-endcapped polyimide component. Based on a gas chromatography mass spectroscopy analysis of a surface rinse of the composition performed at room temperature, the composition can have at least one surface with less than or equal to 5 ppb releasable phosphorous residuals, and less than or equal to 5 ppb releasable volatile organic compound residuals. The composition can also comprise less than or equal to 10 ppb combined releasable residuals. Because of the very low levels of residual contamination, the compositions can be used to produce a variety of articles including a disk drive.
1. An article comprising a monoamine-endcapped polyimide component selected from the group consisting of monoamine-endcapped polyetherimides, monoamine-endcapped polyetherimide sulfones, and combinations thereof,
wherein the composition, based on a gas chromatography mass spectroscopy analysis of a surface rinse of the composition performed at room temperature, has at least one surface with
less than or equal to 5 ppb releasable phosphorous residuals, less than or equal to 5 ppb releasable volatile organic compound residuals, and
wherein the composition comprises less than or equal to 10 ppb combined releasable residuals, wherein the article is circular and has a diameter ranging from 2 cm to 5 cm.
2. An article comprising a monoamine-endcapped polyimide component selected from the group consisting of monoamine-endcapped polyetherimides, monoamine-endcapped polyetherimide sulfones, and combinations thereof,
wherein the composition, based on a gas chromatography mass spectroscopy analysis of a surface rinse of the composition performed at room temperature, has at least one surface with
less than or equal to 5 ppb releasable phosphorous residuals,
less than or equal to 5 ppb releasable volatile organic compound residuals, and
wherein the composition comprises less than or equal to 10 ppb combined releasable residuals, wherein the article has a thickness ranging from 0.5 mm to 2 mm.
3. A process of melt-spinning fibers, the process comprising melting a composition comprising a monoamine-endcapped polyimide component selected from the group consisting of monoamine-endcapped polyetherimides, monoamine-endcapped polyetherimide sulfones, and combinations thereof,
wherein the composition, based on a gas chromatography mass spectroscopy analysis of a surface rinse of the composition performed at room temperature, has at least one surface with
less than or equal to 5 ppb releasable phosphorous residuals,
less than or equal to 5 ppb releasable volatile organic compound residuals, and
wherein the composition comprises less than or equal to 10 ppb combined releasable residuals to form a melt, passing the melt through a spinnerette to form fibers, and stretching the fibers.
4. The process of claim 3 , wherein the fibers exhibit reduced strand breakage.
5. A disk drive comprising:
a disk; and
an article enclosing at least one surface of the disk,
wherein the article comprises a polyimide component selected from the group consisting of polyetherimides, polyetherimide sulfones, and combinations thereof,
wherein the polyimide component, based on a gas chromatography mass spectroscopy analysis of a surface rinse of the component performed at room temperature, has less than or equal to 5 ppb releasable phosphorous residuals, less than or equal to 5 ppb releasable organic compound residuals, and,
wherein the component comprises less than or equal to 10 ppb combined releasable residuals;
and
wherein the polyimide component is monoamine-endcapped.
6. The disk drive of claim 5 ,
wherein the polyimide component is monoamine-endcapped, wherein the polyimide component is aniline-endcapped.
7. A disk drive comprising:
(a) a disk;
(b) a disk enclosure enclosing at least one surface of the disk,
wherein the disk enclosure comprises a polyimide component selected from the group consisting of polyetherimides, polyetherimide sulfones, and combinations thereof,
wherein the polyimide component, based on a gas chromatography mass spectroscopy analysis of a surface rinse of the component performed at room temperature, has less than or equal to 5 ppb releasable phosphorous residuals, less than or equal to 5 ppb releasable organic compound residuals, and,
wherein the component comprises less than or equal to 10 ppb combined releasable residuals;
and
wherein the polyimide component is monoamine-endcapped; and
(c) a head actuated over the disk, the head comprising
a read element,
a write element,
a preamp, and
an interconnect, the interconnect comprising
a first transmission line,
a second transmission line coupling the head to the preamp, and
a compensation network operable to compensate for an impedance discontinuity in the first and second transmission lines, the compensation network comprising
a first trace, and
a second trace connected in parallel with the first and second transmission lines,
wherein a shape of the first and second traces varies to form at least a first capacitor.
8. A method for producing a polyimide component selected from the group consisting of polyetherimides, polyetherimide sulfones, and combinations thereof,
wherein the polyimide component, based on a gas chromatography mass spectroscopy analysis of a surface rinse of the component performed at room temperature, contains <5 ppb releasable phosphorous residuals, and wherein, the composition comprises <10 ppb releasable contaminants, the method comprising monoamine-endcapping the polyimide.
9. The method of claim 8 , wherein the monoamine-endcapping is done in the absence of phosphorous and volatile organic compounds.