Chemistry: analytical and immunological testing – Synthetic or natural resin
Reexamination Certificate
2006-06-06
2006-06-06
Gakh, Yelena G. (Department: 1743)
Chemistry: analytical and immunological testing
Synthetic or natural resin
C436S164000, C436S171000
Reexamination Certificate
active
07056744
ABSTRACT:
A method of determining the proportion of short-chain branching in an olefin copolymer process stream is disclosed. The short-chain branching may also be determined as a function of molecular weight in a sample having a range of molecular weights. In the method, at least two olefin copolymer training samples are provided. The respective samples have different, known proportions of short-chain branching. The infrared (e.g. FT-IR) absorbance spectra of the training samples in a wavenumber range are obtained. Calibration information is determined from the training samples by chemometrically correlating the differences in the infrared absorbance spectra of the training samples to the differences in the degree of short-chain branching in the training samples. This step generates calibration information that allows the degree of short-chain branching in a sample to be determined once its infrared absorbance spectrum is obtained. A method for determining the statistical error in the measurement of short-chain branching in an olefin polymer sample as a function of its molecular weight distribution is also disclosed.
REFERENCES:
patent: 4460750 (1984-07-01), Thiersault et al.
patent: 5039614 (1991-08-01), Dekmezian et al.
patent: 5071913 (1991-12-01), Powers et al.
patent: 5151474 (1992-09-01), Lange et al.
patent: 5675253 (1997-10-01), Smith et al.
patent: 5700895 (1997-12-01), Kanda et al.
patent: 6072576 (2000-06-01), McDonald et al.
patent: 11060711 (1999-03-01), None
Blitz, et al., “Characterization of Short Chain Branching in Polyethylene Using Fourier Transform Infrared Spectroscopy”,J. Appl. Polym. Sco.,vol. 51, 1994, pp. 13-20.
http://pep.sric.sri.com/Public/Reports/Phase—95/RP019F/RP019F.html “Process Economics Program Report 19”.
http://wwwchem.csustan.edu/Tutorials/INFRARED.htl “Interpretation of Infrared Spectra”.
Baum et al. “Tests on fully synthetic hydrocarbon waxes,” Chem. Spec. Mfr. Ass., Proc. Mid-Year Meet. (1971), 57, 160-4.
Stark “Near-infrared spectroscopy: the new FT frontier -spectroscopic and chemometric considerations,” Proc. SPIE-Int. Soc. Opt. Eng. (1992), 1575 (Int. Conf. Fourier Transform Spectrosc., 8th, 1991), 70-86.
Parker et al. “Vibrational Absorption Intensities in Chemical Analysis, Part 9. The Near-Infrared Spectra of Methyl Branched Alkanes,” J. Phys. Chem. A (1997), 101(50), 9618-9631.
DesLauriers Paul J.
Eastman Alan D.
Hsieh Eric T.
Rohlfing David C.
Gakh Yelena G.
Phillips Petroleum Company
Womble Carlyle Sandridge & Rice PLLC
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