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    • 66. 发明公开
    • High temperature stable modified starch polymers and well drilling fluids employing same
    • Hochtemperaturstabile,modifizierteStärkepolymereundBohrflüssigkeiten,die diese verwendet
    • EP0852235A3
    • 1999-05-19
    • EP97122801.0
    • 1997-12-23
    • Chemstar Products Company
    • Bernu, Cory J.
    • C08B31/00C08B31/12C08B35/00C09K7/02
    • C08B31/006C09K8/206
    • A modified starch polymer derived from an unmodified starch having an amylopectin content of at least 80% by weight. The starch is modified by crosslinking with epichlorohydrin, the amount of epichlorohydrin crosslinking being equivalent to that which is obtained when a crosslinking reaction is subjected to a Brabender viscosity which reaches a maximum value and then is reduced with further crosslinking from its maximum to a value which is no more than 50% of the maximum value, and is carboxymethylated with a degree of substitution of at least 0.1 carboxymethyl groups per anhydroglucose unit. Fermentation stability is obtained when the degree of carboxymethyl substitution is about 0.4 or more. The modified starch polymer may also be hydroxypropylated. The modified starch polymers provide improved high temperature fluid loss performance when incorporated into well drilling fluids. They may also be used in other applications for which cellulosic polymers have heretofore been employed because of their better high temperature tolerance compared to conventional starch polymers.
    • 衍生自支链淀粉含量为至少80重量%的未改性淀粉的改性淀粉聚合物。 淀粉通过与表氯醇交联而改性,表氯醇交联量相当于当交联反应经受Brabender粘度达到最大值后得到的量,然后随着进一步交联从最大值降低至 不超过最大值的50%,并且每个脱葡萄糖单元具有至少0.1个羧甲基取代度的羧甲基化。 当羧甲基取代度为约0.4以上时,可获得发酵稳定性。 改性淀粉聚合物也可以是羟丙基化的。 当掺入钻井液中时,改性淀粉聚合物提供改善的高温流体损失性能。 由于与常规淀粉聚合物相比,它们具有更好的高温耐受性,因此它们也可用于迄今为止已经使用纤维素聚合物的其它应用中。
    • 69. 发明公开
    • Thermoplastic polysaccharide and shaped articles moulded thereof
    • 热塑性淀粉多糖和daraus geformteGegenstände
    • EP0824108A1
    • 1998-02-18
    • EP96202259.6
    • 1996-08-12
    • DSM N.V.
    • Nijenhuis, Atze Jande Brabander-van den Berg, Ellen Marleen MoniqueScholtens, Boudewijn Jan RobertTomka, Ivan, Andras, PeterLi, Zhi
    • C08B31/12C08L3/08
    • C08B31/12C08L3/08
    • The invention relates to a shaped article consisting essentially of a polysaccharide, obtained by moulding the polysaccharide in the absence of a plasticizing additive, an acetal modified polysaccharide therefor and a novel method for the preparation of the acetal modified polysaccharide.
      In the acetal modified polysaccharide part or all hydroxylgroups of the repeating units are substituted by acetalgroups, that do not crosslink and contain at the other oxy group an alkyl, cycloalkyl, aryl or aralkyl group and H, alkyl or cycloalkyl groups at the carbon atom with the oxygroups. The total number of carbon atoms of the substituent acetal groups is at least 5.
      In the method of preparation the polysaccharide is reacted in the melt phase, preferably under pressure, with the acetalyzing compound and the volatile compounds present or being formed are removed from the reaction mixture. Preferably a volatile plasticizing additive is used for bringing the polysaccharide in the meltphase. Uncrosslinked, hydrophobic, thermoplastic modified polysaccharides are obtained that can easily be moulded into shaped articles.
    • 本发明涉及一种成型制品,其基本上由多糖组成,其通过在不存在增塑添加剂的情况下模制多糖,其缩醛改性多糖及其制备缩醛改性多糖的新方法。 在缩醛改性多糖中,重复单元的部分或全部羟基被缩醛基取代,其不与其它氧基交联并含有烷基,环烷基,芳基或芳烷基和在碳原子上具有H,烷基或环烷基的基团, 氧基团。 取代基缩醛基团的碳原子总数为至少5.在制备方法中,多糖在熔融相中,优选在压力下与缩醛化合物反应,并且存在或形成的挥发性化合物从 反应混合物。 优选使用挥发性增塑添加剂使多糖进入熔融相。 得到非交联,疏水,热塑性改性的多糖,其可以容易地模塑成型制品。