Abstract:
PURPOSE: A method for producing a biodegradable polyester polymer in a particulate form, is provided to simplify a conventional complicated process by excluding a milling process or use of any special device, and prevent discharge of hazardous solvents to environment. CONSTITUTION: The method for producing a biodegradable polyester polymer in a particulate form comprises the steps of: charging at least one cyclic monomer into a high pressure reactor; adding an organometallic or acid catalyst and an initiator; injecting compressed gas as a solvent, selected from the group consisting of HFC-23, HFC-32, HFC-152a, HFC-143a, HFC-134a, HFC-125, HFC-227ea, HFC-236fa, HFC-245fa, HFC-254cb, SF6, HFC-4-10-mee, C-318(perfluoro cyclobutane), HCFC-22, HCFC-1416, HCFC-1426, HCFC-225ca/cb, dimethyl ether, N2O, propane, butane, a mixture thereof and a mixture further comprising CO2 and the above mixture, into the reactor; and carrying out solution polymerization.
Abstract:
본 발명은 기재 (基材) 금속, 상기 기재 금속의 표면에 피복된 금 또는 은 박막, 상기 금 또는 은 박막 위에 흡착된 관능성 황 화합물, 상기 황 화합물의 관능기에 화학적으로 결합된 헤파린 (heparin) 또는 에스트라디올 (estradiol) 유도체와 같은 생리활성 물질을 포함하는 표면 개질된 의료용 금속 재료 및 이를 이용하여 제작된 스텐트, 심장 판막 및 카데타를 개시한다. 또한 본 발명은 (1) 기재 금속의 표면에 금 또는 은 박막을 피복하는 단계, (2) 상기 금 또는 은 박막 위에 관능성 황 화합물을 흡착시키는 단계, 및 (3) 상기 황 화합물의 관능기에 생리활성 물질을 화학적으로 결합시키는 단계를 포함하는, 표면 개질된 의료용 금속 재료의 제조 방법을 개시한다.
Abstract:
PURPOSE: A porous supporter for tissue engineering obtained from a copolymer of biodegradable glycolide/ε-caprolactone having excellent mechanical properties such as flexibility and elasticity and biodegradability is provided which can be effectively used as material for regenerating tissue of desired shapes. CONSTITUTION: This porous supporter is prepared from a biodegradable glycolide/ε -caprolactone copolymer having a recurring unit of formula 1 and a weight average molecular weight of 10,000. In formula, x and y are each 18 or more. The porous supporter has a pore size of 1 to 800 microns and a porosity of 50 to 99%.
Abstract:
PURPOSE: A star-shaped glycolide/epsilon-caprolactone co-polymer and a preparation method thereof are provided, which has a weight average molecular weight over 30,000 and a low melting viscosity. CONSTITUTION: A preparation method of star-shaped biodegradable glycolide/epsilon-caprolactone co-polymer of formula 1 comprises: in the presence of ring-opening polymerization catalyst of glycolide/epsilon-caprolactone, performing a ring-opening polymerization by heating glycolide and epsilon-caprolactone through using polyhydric alcohol as polymerization initiator under vacuum pressure. The polyhydric alcohol is selected from the group of glycerol, penta-erythritol, di-penta-erythritol, tri-penta-erythritol, sorbitol, poly-vinyl alcohol, poly-hydroxy ethyl methacrylate, and poly-hydroxy propyl methacrylate. The catalyst is selected from the group of tetra-phenyl tin, tin powder, stannous octoate, tin chloride, tin oxide, zinc powder, di-ethyl zinc octoate, zinc chloride, and zinc oxide.
Abstract:
본 발명은 국소마취제-함유 친수성 중합체 매트릭스층, 비투과성 지지막 및 박리형 라이너로 구성된 구강용 국소마취 패취제 및 그의 제조방법에 관한 것이다. 본 발명에 따르는 패취제는 적용 부위에 지속적으로 마취제를 방출하여 국소적 마취 효과를 장시간 유지시킨다.
Abstract:
The polymer having a repeating unit of formula (I) is prepared by condensation reacting aromatic dihalogen compound (A) of formula (II) and aromatic diol (B) of formula (III) in the presence of alkali metal salt at 140-250 deg.C for 1-12 hr. In formulae, Ar is phenylene, biphenylene, etc., X is chlorine and M is alkali metal, compound (A) is 4-fluoro-4'-(4-fluorobenzoyl phenyloxy)diphenylsulfone and compound (B) is selected from 2,2-bis- (4-hydroxyphenyl)propane, hydroquinone or 4,4'-biphenol. The alkali metal salt is potassium carbonate and its addition amount is 1.0-20 wt.% w.r.t. aromatic diol.
Abstract translation:具有式(I)的重复单元的聚合物通过在140-250度的碱金属盐存在下使式(II)的芳族二卤化合物(A)和式(III)的芳族二醇(B) C 1〜12小时。 式中,Ar为亚苯基,亚联苯等,X为氯,M为碱金属,化合物(A)为4-氟-4' - (4-氟苯甲酰苯氧基)二苯砜,化合物(B) 丙二醇,对苯二酚或4,4'-联苯酚。 碱金属盐是碳酸钾,其添加量为1.0-20重量%w.r.t. 芳族二醇。
Abstract:
The acrylic acid alkali metal salt resin is prepd. by steps: (A) polymerising acrylic acid and acrylic acid alkali metal salt in presence of crosslinking agent and radical polymerising initiator in alicyclic hydrocarbon org. solvent; (B) after-polymerising the carboxyl gp. of the obtd. polymer with water soluble diglycidyl ether; (C) adding low molecular water soluble polymer selected from polyehylene glycol or hydroxyethyl cellulose. The sametimely crosslinking agent is selected from diacrylate, triacrylate, polyethyleneglycol di(meth)acrylate or alkylenebisacryl amide of polyol having more two polymerisable functional gp.. The solvent contains 3-6 HLB surfactant and 8-15 HLB surfactant.