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    • 4. 发明授权
    • Process for producing cellulose diacetate having improved resistance to
delustering phenomenon in hot water
    • 具有改善的耐热消光现象的纤维素二乙酸酯的制造方法
    • US4269972A
    • 1981-05-26
    • US047469
    • 1979-06-11
    • Hideo YabuneYoshiyuki Ikemoto
    • Hideo YabuneYoshiyuki Ikemoto
    • C08B3/06
    • C08B3/06
    • Cellulose diacetate having improved resistance to delustering in hot water is produced by acetylation cellulose in the presence of a catalyst and then hydrolyzing (or ripening) the product to form secondary cellulose acetate; wherein the catalyst in the acetylated mixture is completely neutralized before about the middle of the hydrolysis reaction at the latest and thereafter hydrolysis is carried out at a temperature of about 110.degree. to 120.degree. C. while maintaining the concentration of acetic acid in the reaction mixture at about 67 to 78% by weight based on the total weight of the acetic acid and water, the relation between the hydrolysis temperature and the concentration of acetic acid being defined by the area between and including points A, B, C and D in FIG. 2.
    • 乙酰化纤维素在催化剂存在下产生具有改善的热水消光耐性的纤维素二乙酸酯,然后水解(或熟化)该产物以形成乙酸纤维素; 其中乙酰化混合物中的催化剂最近在水解反应中间完全中和,然后水解在约110-120℃的温度下进行,同时保持反应混合物中乙酸的浓度 以乙酸和水的总重量计约67至78重量%,水解温度与乙酸浓度之间的关系由图3中的点A,B,C和D之间的面积和包括点A,B,C和D之间的面积 。 2。
    • 5. 发明授权
    • Process for producing cellulose acetate
    • 生产乙酸纤维素的方法
    • US4439605A
    • 1984-03-27
    • US433615
    • 1982-10-12
    • Hideo YabuneYoshiyuki IkemotoYounosuke KatoManabu Uchida
    • Hideo YabuneYoshiyuki IkemotoYounosuke KatoManabu Uchida
    • C08B3/06C08B3/24
    • C08B3/24C08B3/06
    • A process for producing cellulose diacetate is disclosed which comprises the steps of:(a) pretreating and activating 100 parts by weight of cellulose, adding a mixture of 200 to 400 parts of acetic anhydride, 0 to 350 parts of glacial acetic acid, and 0.5 to 5 parts of acid catalyst, heating the reactants to a temperature from 50.degree. C. to 85.degree. C. at approximately a constant rate, maintaining this temperature for 3 to 20 minutes, thereby acetylating cellulose to form primary cellulose acetate;(b) neutralizing the acid catalyst in the reaction mixture containing primary cellulose acetate obtained in step (a), introducing steam under pressure into the system to change the temperature of the system to 125.degree. C. to 170.degree. C., and maintaining this temperature for 30 minutes to 6 hours, thereby hydrolyzing the primary cellulose acetate to accomplish ripening; and(c) flashing the ripened reaction mixture at a temperature of 125.degree. C. to 170.degree. C. by discharging same to the ambient atmosphere, recovering by condensation the gas generated during flashing having an acetic acid/water weight ratio of 70-80/30-20, and simultaneously cooling the remaining liquid reaction mixture to about 100.degree. C., thereby substantially stopping the hydrolysis reaction.
    • 公开了一种制备纤维素二乙酸酯的方法,其包括以下步骤:(a)预处理和活化100重量份的纤维素,加入200-400份乙酸酐,0-350份冰乙酸和0.5份 至5份酸催化剂,以大约恒定速率将反应物加热至50℃至85℃的温度,将该温度保持3至20分钟,由此乙酰化纤维素以形成乙酸纤维素; (b)中和在步骤(a)中获得的含有初级纤维素乙酸酯的反应混合物中的酸催化剂,将压力下的蒸汽引入体系中以将体系的温度改变至125℃至170℃,并保持该 温度30分钟至6小时,从而水解初级纤维素乙酸酯以达到熟化; 和(c)将熟化的反应混合物在125℃至170℃的温度下闪蒸,通过将其排放到环境大气中,通过冷凝回收,在闪蒸期间产生的气体具有70-80的乙酸/水重量比 / 30-20,同时将剩余的液体反应混合物冷却至约100℃,从而基本上停止水解反应。
    • 7. 发明授权
    • Cement retarder and cement retardative sheet
    • 水泥缓凝剂和水泥阻滞片
    • US5932344A
    • 1999-08-03
    • US718384
    • 1996-10-07
    • Yoshiyuki IkemotoToru Ikuta
    • Yoshiyuki IkemotoToru Ikuta
    • B44C1/10B44C1/22B44C5/04C04B24/26C04B24/28C04B41/53B32B13/12B32B27/06B32B27/26B32B27/36
    • C04B41/009B44C1/105B44C1/22B44C5/0438C04B24/26C04B24/283C04B41/5323C04B2103/20C04B2103/22Y10T428/28Y10T428/2852Y10T428/31786Y10T428/31794
    • A cement retarder which comprises a saturated or unsaturated polyester obtained by a reaction of a polycarboxylic acid component comprising a polycarboxylic acid having 2 to 6 carbon atoms in the main chain or its derivative, and a polyol component containing a polyhydric alcohol having 2 to 4 carbon atoms or its condensate, wherein:(a) the saturated polyester has a weight average molecular weight of about 300 to about 50,000; or(b) the unsaturated polyester has a weight average molecular weight of about 500 to about 25,000; or(c) the polyhydric alcohol used to obtain the saturated or unsaturated polyester is a condensate of a C.sub.2-4 alkylene glycol; or(d) the saturated polyester is a polyester obtained by the use of a condensate of a C.sub.2-4 alkylene glycol and has a weight average molecular weight of about 300 to about 50,000; or(e) the unsaturated polyester is a polyester obtained by the use of a condensate of a C.sub.2-4 alkylene glycol and has a weight average molecular weight of about 500 to about 25,000.
    • PCT No.PCT / JP96 / 00252 Sec。 371日期1996年10月7日第 102(e)日期1996年10月7日PCT PCT 1996年2月7日PCT公布。 WO96 / 24563 PCT出版物 日期1996年8月15日一种水泥缓凝剂,其包含通过包含主链或其衍生物中具有2至6个碳原子的多元羧酸的多元羧酸组分与含有多元醇的多元醇组分反应获得的饱和或不饱和聚酯 具有2至4个碳原子或其缩合物,其中:(a)饱和聚酯的重均分子量为约300至约50,000; 或(b)不饱和聚酯的重均分子量为约500至约25,000; 或(c)用于获得饱和或不饱和聚酯的多元醇是C 2-4亚烷基二醇的缩合物; 或(d)饱和聚酯是通过使用C2-4亚烷基二醇的缩合物而得到的聚酯,其重均分子量为约300至约50,000; 或(e)不饱和聚酯是通过使用C 2-4亚烷基二醇的缩合物得到的聚酯,其重均分子量为约500至约25,000。