摘要:
This invention is a method of making heat-resistant polyester, the method being characterized by reacting the polyester consisting of aromatic dicarboxylic acid and the glycol component of 2-6 carbons with 0.3-5 weight % of the N-glycidylisocyanuric acid compound containing 1-2 N-glycidyl groups to reduce the amount of end carboxyl groups to less than 15 g equivalents per 10.sup.6 of the polymer.
摘要:
This invention is a method of making heat-resistant polyester, the method being characterized by reacting the polyester consisting of aromatic dicarboxylic acid and the glycol component of 2-6 carbons and being in the molten state with 0.1-5 weight percent of molten 2,2'-1,3-phenylene-bis(2-oxazoline) to reduce the amount of end carboxyl group in the polyester to below 15 g equivalents per 10.sup.6 g of the polymer.
摘要:
This invention is a method of making heat-resistant polyester, the method being characterized by reacting the polyester consisting of the aromatic dicarboxylic acid and the glycol with 2-6 carbons with 0.1-5 wt % of the bifunctional epoxy compound expressed by the general formula ##STR1## (R is hydrocarbon group; it may be substituted) to reduce the amount of end carboxyl group to less than 15 g equivalents per 10.sup.6 g of the polymer.
摘要:
This invention is a polymer and a method of making heat resistant polyester characterized by reacting the polyester, consisting of aromatic dicarboxylic acid and the glycol component with 2-6 carbons, with 0.1-5 weight % of the bifunctional epoxy compound which is expressed by the following general formula (A) or (B): ##STR1## (R is a divalent organic group) and has 2 or 3 carbonyl groups adjacent to the nitrogen atom, to reduce the amount of the end carboxyl group to below 15 g equivalent/10.sup.6 g polymer.
摘要:
This invention is a method of making heat-resistant polyester, the method being characterized by reacting the polyester consisting of the aromatic dicarboxylic acid and the glycol component of 2-6 carbons with 0.1-5 weight percent of the bifunctional epoxy compound given by the general formula ##STR1## (R is an organic group containing benzene ring) to reduce the amount of the end carboxyl group to below 15 g equivalents per 10.sup.6 g of the polymer.
摘要:
This invention is a polymer and a method of making heat resistant polyester which is characterized by reacting the polyester which consists of aromatic dicarboxylic acid and glycol with 2-6 carbons, with 0.1-5 weight % of the bifunctional epoxy compound which has one carbonyl group adjacent to the nitrogen atom and is expressed by the general formula ##STR1## (R is a divalent organic group) to keep the amount of end carboxyl group below 15 g equivalent/10.sup.6 g polymer.
摘要:
A steel sheet containing C: 0.02% or more and 0.10% or less, Si: 0.01% or more and 0.5% or less, P: 0.001% or more and 0.100% or less, S: 0.001% or more and 0.020% or less, N: 0.007% or more and 0.025% or less, Al: 0.01% or more and {−4.2×N (%)+0.11} % or less, Mnf: 0.10% or more and less than 0.30% where Mnf is defined by equation Mnf=Mn−1.71×S, and the balance being Fe and inevitable impurities, in which the steel sheet has a thickness of 0.35 (mm) or less, the product of the lower yield point (N/mm2) of the steel sheet and the thickness (mm) is 160 (N/mm) or less, and the product of the upper yield point (N/mm2) of the steel sheet is 52.0 (N) or more.
摘要:
A tin-plated steel sheet includes a plating layer containing tin on at least one surface of a steel sheet, and a chemical conversion coating containing P and tin on the plating layer is provided. In the steel sheet, a coated amount of the chemical conversion coating per surface is 1.0 to 50 mg/m2 in terms of P, an atomic ratio Sn/P obtained from the intensity of a P2p peak and that of a Sn3d peak is 1.0 to 1.5, the intensities being measured at the surface using an x-ray photoelectron spectroscopic method, and an atomic ratio O/P obtained from the intensity of the P2p peak and that of an O1s peak is 4.0 to 9.0. The phosphoric acid-based chemical conversion coating of the tin-plated steel sheet can suppress degradation in performance, which is caused by the growth of a tin oxide layer on the surface, instead of a conventional chromate coating.
摘要:
An apparatus for measuring the refractive power of an optical system has a scan optical system for scanning a fundus with slit light beams, a measuring optical system for taking the slit light beams reflected from the fundus of the examined eye, a plurality of light receivers for detecting the slit light beams taken in by the measuring optical system, and a calculator for obtaining Fourier spectrums by Fourier-transforming detection signals of the plurality of light receivers and thus calculating the eye refractive power of the examined eye on the basis of predetermined frequency components of Fourier spectrums of the detection signals.
摘要:
A steel sheet containing C: 0.02% or more and 0.10% or less, Si: 0.01% or more and 0.5% or less, P: 0.001% or more and 0.100% or less, S: 0.001% or more and 0.020% or less, N: 0.007% or more and 0.025% or less, Al: 0.01% or more and {−4.2×N (%)+0.11}% or less, Mnf: 0.10% or more and less than 0.30% where Mnf is defined by equation Mnf=Mn−1.71×S, and the balance being Fe and inevitable impurities, in which the steel sheet has a thickness of 0.35 (mm) or less, the product of the lower yield point (N/mm2) of the steel sheet and the thickness (mm) is 160 (N/mm) or less, and the product of the upper yield point (N/mm2) of the steel sheet is 52.0 (N) or more.