公开(公告)号：US5944866A

公开(公告)日：1999-08-31

申请号：US89859

申请日：1998-06-03

申请人： You-Lung Chen ,  Sanjay Patel ,  Jorge Luis Valdes

发明人： You-Lung Chen ,  Sanjay Patel ,  Jorge Luis Valdes

IPC分类号： C03B8/02 ,  C03B20/00 ,  C03B37/012 ,  C03C1/00 ,  C03B37/016

CPC分类号： C03C1/006 ,  Y10S65/901

摘要： The invention provides an alternative to conventional sol-gel methods that utilize undesirably high amounts of a stabilizing agent such as TMAH and a gelling agent such as methyl formate. The method involves the steps of (a) providing a colloidal silica dispersion containing a stabilizing/gelling agent, where only a portion of the molecules of the agent ionize, and (b) subsequently adding to the silica dispersion a pH-reducing additive. The stabilizing/gelling agent has a dual function. The agent, e.g., an amine, initially acts as a stabilizer in the silica dispersion in that a portion of its molecules ionize, while an appreciable amount of the agent remains non-ionized. The agent later transforms in situ to a gelling agent upon addition of a pH-reducing additive. Specifically, as the pH-reducing additive lowers the pH to values at or around the pK.sub.a of the stabilizing/gelling agent, more of the agent's molecules are ionized, these cations contributing to charge neutralization, and thus gellation, of the colloidal silica particles.

摘要翻译： 本发明提供了常规溶胶 - 凝胶方法的替代方案，其使用不希望的大量稳定剂如TMAH和胶凝剂如甲酸甲酯。 该方法包括以下步骤：（a）提供含有稳定/胶凝剂的胶态二氧化硅分散体，其中只有一部分试剂的分子离子化，和（b）随后向二氧化硅分散体中加入pH降低添加剂。 稳定剂/胶凝剂具有双重功能。 该试剂，例如胺最初充当二氧化硅分散体中的稳定剂，因为其一部分分子离子化，而相当量的试剂保持非离子化。 该添加剂随后在添加pH降低添加剂时原位转化为胶凝剂。 具体地说，随着pH值降低添加剂将pH降低至稳定/胶凝剂的pKa值或周围值，离子化剂的分子越多，这些阳离子有助于胶体二氧化硅颗粒的电荷中和，从而凝胶化。

公开(公告)号：US06242035B1

公开(公告)日：2001-06-05

申请号：US09197644

申请日：1998-11-23

申请人： Ross Clark ,  Neil Morrison ,  You-Lung Chen ,  Todd Talashek ,  Dan Burgum

发明人： Ross Clark ,  Neil Morrison ,  You-Lung Chen ,  Todd Talashek ,  Dan Burgum

IPC分类号： A23L1054

CPC分类号： C08B37/006 ,  C08B37/0024 ,  C08L5/00

摘要： This invention provides reduced molecular weight gellan gums. The reduced molecular weight gellan gums of this invention generally have a weight average molecular weight less than about 1.7×106, and typically in a range of about 1.2×106 to about 9.3×105. This invention also provides compositions, e.g., solutions and gels, comprising reduced molecular weight gellan gums. The reduced molecular weight gellan gums of this invention may be prepared by any method which reduces the molecular weight of polymers. Such methods include homogenization, sonication, radiation, oxidation and hydrolysis.

摘要翻译： 本发明提供了降低的分子量结冷胶。 本发明的还原分子量结冷胶通常具有小于约1.7×10 6，通常在约1.2×10 6至约9.3×10 5的范围内的重均分子量。 本发明还提供组合物，例如溶液和凝胶，其包含降低分子量的结冷胶。 本发明的还原分子量结冷胶可以通过降低聚合物分子量的任何方法来制备。 这些方法包括均化，超声处理，辐射，氧化和水解。

公开(公告)号：US06453608B1

公开(公告)日：2002-09-24

申请号：US09301988

申请日：1999-04-29

申请人： John Flanagan ,  Helen Anderson ,  Frank Miskiel ,  You-Lung Chen

发明人： John Flanagan ,  Helen Anderson ,  Frank Miskiel ,  You-Lung Chen

IPC分类号： A01C106

CPC分类号： A61K9/286 ,  A01C1/06

摘要： A seed coating comprising gellan gum is disclosed along with a process which comprises admixing gellan gum and water under effective shear conditions to prepare an aqueous gellan gum coating composition thereof whereby the aqueous gellan gum coating composition may be applied in an adherent fashion to a seed to form a gellan gum coated seed. A gellan gum seed coating composition may indicate one or more bioactive(s) and optionally one or more colors.

摘要翻译： 公开了包含吉兰糖胶的种皮包衣以及包括在有效剪切条件下混合结冷胶和水的方法以制备其结构胶结胶涂料组合物，由此可将结晶胶结糖涂料组合物以粘附的方式施用于种子 形成结冷胶涂覆的种子。 吉兰糖胶种子涂料组合物可以指示一种或多种生物活性和任选的一种或多种颜色。

公开(公告)号：US06602996B1

公开(公告)日：2003-08-05

申请号：US09719187

申请日：2000-12-08

申请人： Graham Sworn ,  You-Lung Chen ,  Neil A. Morrison ,  Todd Talashek ,  Ross Clark

发明人： Graham Sworn ,  You-Lung Chen ,  Neil A. Morrison ,  Todd Talashek ,  Ross Clark

IPC分类号： C07G1700

CPC分类号： C08B37/006 ,  A23L29/272

摘要： The invention relates to a modified gellan gum in which the total acyl content as well as the ratio of acyl substituent groups to glycerate substituent groups per linear saccharide repeat unit is altered to be higher than 1. The invention further relates to a process for the modification of a gellan gum to alter its acyl content in which the gum is treated with a weak base such as sodium or potassium carbonate or a suitable phosphate. The process enables “tailor made” gums having appropriate setting temperatures and theological properties to be made. Novel compositions containing them are also claimed.

摘要翻译： 本发明涉及一种改性的结冷胶，其中酰基取代基的总酰基含量以及每个线性糖重复单元的甘油酯取代基的比例被改变为高于1.本发明还涉及一种改性方法 的吉兰糖胶改变其酰基含量，其中口香糖用弱碱如碳酸钠或碳酸钾或合适的磷酸盐处理。 该方法使“定制”的牙龈具有适当的设定温度和神学性质。 还要求含有它们的新型组合物。