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公开(公告)号：KR1019930006259B1
公开(公告)日：1993-07-09
申请号：KR1019900001238
申请日：1990-02-02
Applicant: 한국과학기술연구원
IPC: C08G75/20
CPC classification number: C08G75/23 , C08G65/4012 , C08L2205/05
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。
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公开(公告)号：KR1019920000785B1
公开(公告)日：1992-01-23
申请号：KR1019870014654
申请日：1987-12-21
Applicant: 한국과학기술연구원
IPC: C08F20/06
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.
Abstract translation: 制备丙烯酸碱金属盐树脂。 步骤：（A）丙烯酸和丙烯酸碱金属盐在交联剂和自由基聚合引发剂存在下在脂环族烃组分中聚合。 溶剂; （B）羧基gp的后聚合。 的obtd。 聚合物与水溶性二缩水甘油醚; （C）加入选自聚乙二醇或羟乙基纤维素的低分子水溶性聚合物。 同时交联剂选自二丙烯酸酯，三丙烯酸酯，聚乙二醇二（甲基）丙烯酸酯或具有更多两个可聚合官能团的多元醇的亚烷基双丙烯酰胺。该溶剂含有3-6个HLB表面活性剂和8-15个HLB表面活性剂。
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公开(公告)号：KR1019970002523B1
公开(公告)日：1997-03-05
申请号：KR1019930006920
申请日：1993-04-24
Applicant: 한국과학기술연구원
IPC: C08G63/06
CPC classification number: C08G63/06
Abstract: The polylactic acid having high molecular weight at high recovery rate is prepared by polycondensing lactic acid directly. At least tetraol is added to lactic acid and the lactic acid is heated to dehydrate under depressurization without catalyst. So polylactic acid of low molecular weight is obtained. This polylactic acid is heated under depressurization with catalyst to polycondense. Consequently, biodegradable polylactic acid having high molecular weight(30,000 or more) in a star form of molecular structure is prepared. At least 84% of lactic acid is used for raising operation efficiency. After polyol is added to lactic acid, dehydration reaction of lactic acid is performed at 100-150deg. C and 350-30 mmHg for at least 2 hours without catalyst. Polycondensation is carried out with antimony oxide as a catalyst. Polyol is used in amount of 0.01-2 wt.% based on the amount of monomer used polymerization reaction.
Abstract translation: 通过直接缩聚乳酸制备高回收率的高分子量聚乳酸。 将至少四酚加入到乳酸中，并将乳酸在无催化剂的减压下加热脱水。 所以得到低分子量的聚乳酸。 将该聚乳酸在用催化剂减压下加热至缩聚。 因此，制备具有分子结构的星形分子量（30,000以上）的生物降解性聚乳酸。 使用至少84％的乳酸来提高操作效率。 将多元醇加入到乳酸中后，乳酸脱水反应在100-150℃下进行。 C和350-30mmHg至少2小时，无催化剂。 缩聚是用氧化锑作为催化剂进行的。 多元醇的使用量相对于使用聚合反应的单体的量为0.01-2重量％。
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Patent Agency Ranking
公开(公告)号：KR1019940006131B1
公开(公告)日：1994-07-06
申请号：KR1019910024720
申请日：1991-12-27
Applicant: 한국과학기술연구원
Abstract: The method provides an optical information storage media with reversible information saving function so that we can write, store, erase and rewrite information on the media. The method comprises the steps of: (A) making a thin film by dissolving the liquid crystalline polymer into an organic solvent; (B) heating the solvent to the melting temperature of the crystalline polymer, cooling the solvent below the glass transition temperature, and use the fixed thin film as storage layer; (C) melting the liquid crystalline polymer by irradiation of polarized ultraviolet through a photo mask; (D) storing the information by cooling the polymer.
Abstract translation: 该方法提供具有可逆信息保存功能的光学信息存储介质，从而可以在介质上写入，存储，擦除和重写信息。 该方法包括以下步骤：（A）通过将液晶聚合物溶解在有机溶剂中制备薄膜; （B）将溶剂加热至结晶聚合物的熔融温度，将溶剂冷却至低于玻璃化转变温度，并使用固定薄膜作为储存层; （C）通过光掩模照射偏振紫外线来熔化液晶聚合物; （D）通过冷却聚合物来存储信息。
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