摘要:
A microorganism which belongs to the genus Rhizobium and has the ability of degrading an aromatic polyester, and a method of degrading an aromatic polyester by using the microorganism. According to this method, the aromatic polyester can be degraded safely and relatively swiftly at a low cost.
摘要:
A biodegradable complex fiber which retains excellent biodegradability and hydrolyzability and has high strength and high melting temperature suitable for practical use and a method for producing the biodegradable complex fiber are provided. The biodegradable complex fiber comprises at least one polymer material selected from the group consisting of a polyglycolic acid, a poly(glycolic acid-co-lactic acid) and polylactic acid as a core component or as a shell component and a polymer material of poly(3-hydroxybutyric acid) groups or a polymer material of an aliphatic polyester consisting of a dibasic acid and a diol as a shell component or as a core component. The method comprises producing the biodegradable complex fiber by melt spinning.
摘要:
A process for producing granular cocoa which comprises granulating cocoa powder in a fluidized bed while spraying with a liquid binder prepared by heating cocoa powder and/or cacao extract with or without water to obtain granules having a water content of 15 to 40% by weight, and then drying the granules with hot air in a fluidized bed. The resulting granular cocoa easily dissolves in warm milk or warm water without preliminary kneading.
摘要:
The present invention provides a nylon composition having increased hydrolyzability which is obtained by physically mixing 100 parts by weight of a nylon with 1 to 50 parts by weight of at least one polymer selected from the group consisting of polylactic acid, polyglycolic acid and a copolymer containing 50 mol % or more of a lactic acid unit or a glycolic acid unit as a repeating unit in its chain; and a method for increasing the hydrolyzability of a nylon by preparing such a composition. High hydrolyzability can be imparted to the nylon inherently having extremely low hydrolyzability without impairing its original mechanical strength. Therefore, various molded articles made from the nylon can be hydrolyzed under natural circumstances, and thus the wastes are not stored.
摘要:
A polyurethane (I) of 1000 to 100,000 in average molecular weight, comprising plural segments, which are each structural units of A-B, A-C and A-D of the formulae: ##STR1## the proportion of the said segments of A-B, A-C and A-D, i.e. x:y:z is in the molar ratio 0.01 to 0.8:0 to 0.80:0 to 0.99, provided that the sum of x, y and z is 1.0; each segment being produced by combining with repeat units of A, B, C and D of the formulae: ##STR2## wherein R.sup.1 is a skeleton of a diisocyanate and the three R.sup.1 's in each of segments A-B, A-C and A-D can be the same or different; aza is a group of the formula: ##STR3## wherein Y.sup.1 and Y.sup.2 which can be the same or different, are oxygen, imino(--NH--) or a group of the formula:*R.sup.6 --O, *R.sup.6 --NH, O--R.sup.6 --O, *NHCO--R.sup.6 --NH or *CONH--R.sup.6 --NH;whereinR.sup.6 is alkylene and an atom or the end of the group, marked by * is bonded to phenyl ring;R.sup.4 and R.sup.5 each are, independently, hydrogen, halogen, nitro or phenyl;R.sup.2 is polyalkylene glycol residue;Z is oxygen or imino and the two Z's are the same;R.sup.3 is alkylene or a group of the formula: ##STR4## wherein R.sup.7 and R.sup.8 which can be the same or different, are alkylene; andR.sup.9 is alkyl;each segment of the polyurethane being contained in the aforementioned proportion of x, y and z, is combined by block-type, random-type or a combination thereof, is degraded specifically in the large intestine. Therefore, by using the polyurethane as pharmaceutical adjuvants, the medicament can be delivered specifically to the large intestine and at a high concentration with hardly any degradation and absorption in the small intestine, after oral administration.
摘要翻译:平均分子量为1000至100,000的聚氨酯(I),包含多个片段,其各自为AB,AC和AD的结构单元,其分子式如下: AB AC和 AD 所述AB,AC和AD的区段,即x:y:z的摩尔比为0.01至0.8:0至0.80:0至0.99,条件是x,y和z的和为1.0; 每个片段通过与下式的A,B,C和D的重复单元组合来产生:A -aza-,BZR2Z和C OR3O; D其中R1是二异氰酸酯的骨架,并且段A-B,A-C和A-D中的每一个中的三个R 1可以相同或不同; 氮杂是下式的基团:其中可以相同或不同的Y1和Y2是氧,亚氨基(-NH-)或下式的基团:R6 -O,* R6-NH,O-R6-O,* NHCO-R6-NH或* CONH-R6-NH; 其中R6是亚烷基,并且由*标记的基团的原子或末端键合到苯环上; R4和R5各自独立地为氢,卤素,硝基或苯基; R2是聚亚烷基二醇残基; Z是氧或亚氨基,两个Z相同; R 3是亚烷基或下式的基团:其中可以相同或不同的R 7和R 8是亚烷基; 并且R 9为烷基; 以上述比例的x,y和z包含的聚氨酯的各段通过嵌段型,无规型或其组合组合在大肠中特异性降解。 因此,通过使用聚氨酯作为药物佐剂,可以在口服给药后,将药物特异性递送至大肠,高浓度,几乎不会在小肠中降解和吸收。
摘要:
A process for the preparation of a dicarboxylic acid using a thermophilic croorganism, and the microorganism used. The process involves cultivating a microorganism belonging to the genus Mycobacterium which produces a dicarboxylic acid at high temperatures in a medium to which a substrate selected from among normal paraffins, fatty acids, and their derivatives, each containing 6 to 22 carbon atoms, has been added, so that a dicarboxylic acid containing 6 to 22 carbon atoms is formed and accumulated in the medium, and collecting the dicarboxylic acid.
摘要:
A process for producing a glycolipid ester represented by the formula, ##STR1## wherein R.sub.3 represents a hydrogen atom or a methyl group, R.sub.4 represents a saturated or unsaturated hydrocarbon group having 12 to 16 carbon atoms when R.sub.3 is a hydrogen atom, R.sub.4 represents a saturated or unsaturated hydrocarbon group having 11 to 15 carbon atoms when R.sub.3 is a methyl group, and R represents a saturated or unsaturated alkyl group having 2 to 20 carbon atoms, which comprises subjecting Sophorolipid to methanolysis and methylation reactions by reaction with methanol in the presence of a strong acid to produce methyl 1-[(2'-O-.beta.-D-glucopyranosyl-.beta.-D-glucopyranosyl)oxy]-alkanoate and -alkenoate, and subjecting the resulting mixture to ester interchange by reaction with an alcohol represented by the formula,ROHwherein R is the same as defined above.
摘要:
A hydroxyalkyl-etherified glycolipid ester represented by the formula (I), ##STR1## wherein R.sup.1 represents a methyl group or a hydrogen atom, R.sup.2 represents a saturated or unsaturated hydrocarbon group having 11 to 15 carbon atoms when R.sup.1 is a methyl group, R.sup.2 represents a saturated or unsaturated hydrocarbon group having 12 to 16 carbon atoms when R.sup.1 is a hydrogen atom, R.sup.3 represents a saturated or unsaturated hydrocarbon group having 1 to 20 carbon atoms, A represents --CH.sub.2 --CH.sub.2 --O-- or ##STR2## and a,b,c,d,e,f and g represent integers from 1 to 60 in the sum total.
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.