摘要:
The present invention provides a process for producing polyhydroxycarboxylic acids which have a weight-average molecular weight of 50,000 or above and which are excellent as biodegradable plastics by polycondensing hydroxycarboxylic acids or oligomers thereof in the presence of an inorganic solid acid catalyst in combination with an alkali metal or an alkaline earth metal.
摘要:
It is an object of the present invention to provide polylactic acid containing a stereocomplex crystal and having excellent moldability, a high molecular weight, high crystallinity and a high melting point and a process for manufacturing the same. It is another object of the present invention to provide a composition comprising the polylactic acid and a molded product of the polylactic acid. The present invention is characterized from polylactic acid having a weight average molecular weight of 80,000 to 500,000 and a melting peak at 195° C. or higher which accounts for 80% or more of the total of melting peaks in the temperature elevation step when measured by a differential scanning calorimeter (DSC) and a process for manufacturing the same.
摘要:
A synchronous moving device includes: a device body; a movable portion which is provided in the device body; a feed screw shaft which is supported on the device body; a nut member which is thread-engaged with the feed screw shaft; a coupler which couples the movable portion and the nut member; and a cable binder which supports and guides a cable wired into the movable portion, wherein: the coupler includes a first member fixed to the movable portion, a second member fixed to the nut member, and an intermediate member interposed between the first and second members for absorbing deflecting motion of the feed screw shaft; and an end portion of the cable binder on a side of wiring of the cable into the movable portion is connected to the second member through a connection member and moved in synchronization with the movable portion.
摘要:
It is an object of the present invention to produce a polylactic acid having a high molecular weight such as a weight average molecular weight (Mw) of more than 100,000 from which only a stereocomplex crystal is grown even by repeating melting and crystallization. The present invention is a process of producing a polylactic acid, including the steps of: (i) obtaining a solid by kneading together poly(L-lactic acid) and poly(D-lactic acid) at a temperature of 160 to 225° C. and crystallizing the kneaded product; and (ii) melt kneading the obtained solid.
摘要:
A scale base is fixed to a base in a plurality of locations which are aligned in a measuring direction (a Y direction) in which measurement by a scale is carried out, slits are provided in the scale base in positions lying between the locations where the scale base is fixed to the base, the scale is supported by the scale base in two or more of the locations where the scale base is fixed to the base, and the scale base has gaps between the base and the scale base in positions other than the locations where the scale base is fixed to the base and between the scale and the scale base in the positions other than the locations where the scale base is fixed to the base.
摘要:
A polyester containing aromatic moieties is contacted with microorganisms having the activity of decomposing the polyester to decompose or reduce it. Preferably, either or both of Trichosporon FERM BP-6445 or Arthrobacter FERM BP-6444 was contacted with the polyester to decompose or reduce it. A fiber made of the polyester or a cloth made of such fiber may be reduced by contacting it with the microorganisms having the activity of decomposing the polyester.
摘要翻译:将含有芳族部分的聚酯与具有分解聚酯活性的微生物接触以分解或还原。 优选地,将Trichosporon FERM BP-6445或节杆菌FERM BP-6444中的任一种或两者与聚酯接触以分解或还原。 由聚酯制成的纤维或由这种纤维制成的布可以通过使其与具有分解聚酯活性的微生物接触而被还原。
摘要:
A polyester fiber is provided, which does not produce a huge amount of residues during its reducing process, and shows good appearance, feeling and superior characteristics as a fiber, such as a high tensile strength and elongation. Such polyester fiber is a conjugate fiber comprising a core spinned from a polyester containing an aromatic moiety and a skin layer surrounding the core, the skin layer spinned from an aliphatic polyester. The skin layer may be easily reduced by contacting it with an alkaline solution or an enzyme, to provide a reduced fiber with good appearance, feeling and superior characteristics as a fiber.
摘要:
Disclosed herein is a process for producing an unsaturated fatty acid or derivative thereof which comprises culturing an unsaturated fatty acid-producing microorganism belonging to the genus Rhodococcus in a medium containing a saturated fatty acid or a derivative thereof, or causing the resting cells of the microorganisms to act on a saturated fatty acid or a derivative thereof. Also disclosed herein is a process for producing an alkene or derivative thereof which comprises culturing an unsaturated hydrocarbon compound-producing microorganism belonging to the genus Rhodococcus in a medium containing an alkane or derivative thereof, or causing the resting cells of the microorganism to act on an alkane or derivative thereof.
摘要:
A novel microorganism Torulopsis bombicola KSM-36 (FERM BP-799) isolated from cabbage leaves grown in a cabbage field located in Musashino-shi, Tokyo, has sophorose-producing activity.
摘要:
It is an object of the present invention to provide polylactic acid containing a stereocomplex crystal and having excellent moldability, a high molecular weight, high crystallinity and a high melting point and a process for manufacturing the same. It is another object of the present invention to provide a composition comprising the polylactic acid and a molded product of the polylactic acid. The present invention is characterized from polylactic acid having a weight average molecular weight of 80,000 to 500,000 and a melting peak at 195° C. or higher which accounts for 80% or more of the total of melting peaks in the temperature elevation step when measured by a differential scanning calorimeter (DSC) and a process for manufacturing the same.