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    • 1. 发明授权
    • Silica particle manufacturing process
    • 二氧化硅颗粒制造工艺
    • US08974762B2
    • 2015-03-10
    • US13269159
    • 2011-10-07
    • Nicholas S. ErgangBruce A. KeiserRichard MimnaBrett ShowalterIan SaratovskyHung-Ting Chen
    • Nicholas S. ErgangBruce A. KeiserRichard MimnaBrett ShowalterIan SaratovskyHung-Ting Chen
    • C01B33/02C01F7/00C01B33/12C01B33/141C01B33/18C09C1/02C09C1/30C01B33/187
    • C01B33/12C01B33/1415C01B33/18C01B33/187C01P2002/54C01P2006/12C01P2006/14C01P2006/16C09C1/02C09C1/3081
    • Methods of forming a silica-containing products are disclosed. One method comprises: (a) providing a silica containing precursor (SCP) contained in solution that has a pH less than or equal to a pH of 7; (b) optionally doping the SCP with one or more metal species; (d) adding an effective amount of salt to the solution so that the conductivity of the solution is greater than or equal to 4 mS; (e) optionally filtering and drying the SCP; and (f) optionally reacting the dried product from step e with a functional group. Another method comprises: (a) providing a silica containing precursor (SCP) contained in solution that has a pH greater than 7; (b) adjusting the pH of the solution to less than or equal to 7; (c) optionally doping the SCP with one or more metal species; (d) adjusting the pH of the solution to greater than 7; and (e) adding an effective amount of salt to the solution so that the conductivity of the solution is greater than or equal to 4 mS; (f) optionally filtering and drying the SCP. The SCP is then added to a hygroscopic solid such that the resulting product comprises a metal oxide-doped or metal sulfide-doped silica-containing product deposited on a substrate selected from hydrated alkaline earth oxide, lanthanide oxide, and combinations thereof.
    • 公开了形成含二氧化硅的产品的方法。 一种方法包括:(a)提供pH小于或等于7的溶液中含有的含二氧化硅的前体(SCP); (b)任选地用一种或多种金属物质掺杂SCP; (d)向溶液中加入有效量的盐使溶液的电导率大于或等于4mS; (e)任选地过滤和干燥SCP; 和(f)任选地使来自步骤e的干燥产物与官能团反应。 另一种方法包括:(a)提供包含在pH大于7的溶液中的含二氧化硅的前体(SCP); (b)将溶液的pH调节至小于或等于7; (c)任选地用一种或多种金属物质掺杂SCP; (d)将溶液的pH调节至大于7; 和(e)向溶液中加入有效量的盐,使溶液的电导率大于或等于4mS; (f)可选地过滤和干燥SCP。 然后将SCP加入到吸湿固体中,使得所得产物包含沉积在选自水合碱土金属氧化物,镧系元素氧化物及其组合的底物上的金属氧化物掺杂或金属硫化物掺杂的含二氧化硅的产物。
    • 6. 发明授权
    • Method of making paper
    • 制作纸的方法
    • US06372089B1
    • 2002-04-16
    • US09504319
    • 2000-02-14
    • Bruce A. KeiserMaureen B. NunnCheng-Sung HuangDennis I. MacDonald
    • Bruce A. KeiserMaureen B. NunnCheng-Sung HuangDennis I. MacDonald
    • D21H1768
    • C01B33/1435C01B33/143D21H17/29D21H17/68D21H21/10
    • Disclosed are stable, aqueous colloidal silicas having surface area of greater than 700 m2/g and S-values of from 20-50. These colloidal silicas do not require treatment with surface treatment agents such as aluminum to achieve stability. These colloidal silica aquasols can be produced and stored at concentrations of greater than 7 percent by weight SiO2 solids, and even as high as 15 percent by weight solids or higher, and remain stable at room temperature for at least 30 days compared to art-known silica aquasols. These colloidal silica sols demonstrate advantageously improved performance over art-known colloidal silica sols in applications such as in drainage and retention in papermaking processes. Also disclosed are processes for making aqueous colloidal silicas of the invention and the use of such colloidal silicas in papermaking processes.
    • 公开了表面积大于700m 2 / g且S值为20-50的稳定的水性胶体二氧化硅。 这些胶体二氧化硅不需要用表面处理剂如铝处理以达到稳定性。 这些胶体二氧化硅水溶胶可以以大于7重量%的SiO 2固体,甚至高达15重量%固体或更高的浓度生产和储存,并且在室温下保持稳定至少30天,与本领域已知的 二氧化硅水溶胶。 这些胶体二氧化硅溶胶在本领域已知的胶体二氧化硅溶胶的应用中,例如在造纸方法中的排水和保留方面,显示出有利地提高的性能。还公开了制备本发明的水性胶体二氧化硅的方法以及这种胶体二氧化硅在造纸方法中的用途。