共查询到20条相似文献,搜索用时 203 毫秒
1.
21世纪是影像业快速向数字化、网络化发展的时代。传统影像材料公司、影像器材生产商和IT企业纷纷汇集于这一极具发展前景的产业,竞争日益激烈,其中面对中国市场,各大公司都寄予厚望。对国际大公司申请的中国专利情况进行跟踪分析,有助于我们及时掌握国内技术和市场的发展动向,开阔思路,激发创新灵感。本次分析报告针对惠普、佳能、富士、柯达、精工爱普生、柯尼卡美能达、爱克发和三菱制纸八家公司,统计了公开日从2001年至2005年6月的近9000件中国专利。报告主要分为3个部分:(1)通过对比各公司在全球、本国和中国的专利数据,从侧面了解各公司的经济实力、技术创新能力、对外发展战略、对中国市场的定位以及对中国市场创新性技术投入的策略;(2)对各公司的专利数据按照所属技术领域进行归纳和分析,详细分析各公司近年来中国专利技术的全貌、重点技术领域、最新发展动向以及采取的专利策略;(3)对各公司中国专利涉及的主要技术领域作简要的横向对比,由此从产业全景角度,发现重点领域,挖掘空白领域,并提出有关未来技术发展和专利工作的一些建议。 相似文献
2.
21世纪是影像业快速向数字化、网络化发展的时代。传统影像材料公司、影像器材生产商和IT企业纷纷汇集于这一极具发展前景的产业,竞争日益激烈,其中面对中国市场,各大公司都寄予厚望。对国际大公司申请的中国专利情况进行跟踪分析,有助于我们及时掌握国内技术和市场的发展动向,开阔思路,激发创新灵感。本次分析报告针对惠普、佳能、富士、柯达、精工爱普生、柯尼卡美能达、爱克发和三菱制纸八家公司,统计了公开日从2001年至2005年6月的近9000件中国专利。报告主要分为3个部分:(1).通过对比各公司在全球、本国和中国的专利数据,从侧面了解各公司的经济实力、技术创新能力、对外发展战略、对中国市场的定位以及对中国市场创新性技术投入的策略;(2)对各公司的专利数据按照所属技术领域进行归纳和分析,详细分析各公司近年来中国专利技术的全貌、重点技术领域、最新发展动向以及采取的专利策略;(3)对各公司中国专利涉及的主要技术领域作简要的横向对比,由此从产业全景角度,发现重点领域,挖掘空白领域,并提出有关未来技术发展和专利工作的一些建议。 相似文献
3.
从漱口水相关中国专利申请数据从发,研究中国专利申请量变化趋势、重点申请人和技术领域,讨论了专利技术3个发展阶段,行业内重要市场主体专利技术的研发情况,各自的技术研发方向,并利用引文分析探索漱口水行业的重点专利等。结果表明,漱口水领域技术处于持续发展阶段,国外公司依然重视中国市场,国内的研发重点集中于中草药、植物来源有效成分的开发,国际大公司重视有效成分的改进。相关结果为漱口水行业市场主体的研发、竞争战略制定等提供参考。 相似文献
4.
5.
6.
7.
8.
9.
10.
11.
12.
氧乙烯联接链的季铵盐Gemini表面活性剂合成及胶团化特性 总被引:6,自引:0,他引:6
合成了含氧乙烯联接链的季铵盐Gemini表面活性剂C12 2 En C12·2Br〔C12=C12H25N+(CH3)2,2=CH2CH2,En=(OC2H4)n,2Br=2Br-,n=1,2,3〕。以电导和稳态荧光法研究了胶团化行为,结果表明,C12 2 En C12·2Br的胶团化能力比其单体表面活性剂十二烷基三甲基溴化铵(C12TABr)高得多,接近于以2个亚甲基构成联接链的C12 2 C12·2Br。胶团聚集数N和表面反离子结合度K0也与C12 2 C12·2Br胶团相当。C12 2 En C12·2Br胶团化过程呈现焓/熵补偿现象,以n=1的胶团最为稳定。 相似文献
13.
The aqueous solution properties of a cationic poly(trimethyl acrylamido propyl ammonium iodide) [poly(TMAAI)] were studied by measurements of reduced viscosity, intrinsic viscosity, and flocculation test. The reduced viscosity and intrinsic viscosity of this cationic polyelectrolyte were related to the types and concentration of added salt. “Soft” salt anions were more easily bound on the quaternary ammonium (R4N+) of poly(TMAAI) than those of “hard” salt anions. Halide anions are hard anions; consequently, hard cations were more easily attracted to halide anions for reducing the binding degree of halide anion on the quaternary ammonium group (R4N+). Some salt ions were observed to strongly attract the quaternary ammonium of the cationic polymeric side chain for coagulation of the polymers. This effect would make the polymeric aqueous solution become turbid. The intrinsic viscosity behavior for cationic polyelectrolyte resulting from the electrostatic repulsive force of the polymer chain is contrasted with polyampholyte. A comparison of various flocculants as to the effect of flocculation was also studied. © 1994 John Wiley & Sons, Inc. 相似文献
14.
A cationic poly(methyl iodide quaternized styrene-dimethylaminopropylmaleimide) copolymer [poly(MIQSDMAPM)] was synthesized by imidizing styrene-maleic anhydride (SMA) copolymer. Its aqueous solution properties were studied by measurements of reduced viscosity, intrinsic viscosity, and a flocculation test. The reduced viscosity and intrinsic viscosity of this cationic polyelectrolyte were related to the types and concentration of the added salt. “Soft” salt anions were more easily bound to the quaternary ammonium cation (R4N+) of poly(MIQSDMAPM) than “hard” salt anions. Halide anions are hard anions; consequently, hard cations were more easily atracted to halide anions, and reduced binding degree of halide anion on the quaternary ammonium group (R4N+). Some salt ions were observed to strongly attract the quaternary ammonium group of the cationic polymeric side chain and resulted in agglomeration of the polymers. A comparison of various flocculants as to the effect of flocculation was made in this study. © 1996 John Wiley & Sons, Inc. 相似文献
15.
首先由2-甲基丁酸、氯化亚砜,合成了2-甲基丁酰氯,其次,以无水三氯化铝为催化剂,苯与2-甲基丁酰氯反应合成了2-甲基-1-苯基-1-丁酮,当催化剂用量为22 g,2-甲基丁酰氯的滴加时间为1.5 h,苯与2-甲基丁酰氯物质量的比为5.0∶1时,收率为92.6%。最后在氢氧化钠水溶液中,以四氯化碳为氯化试剂,四丁基溴化铵为相转移催化剂,将2-甲基-1-苯基-1-丁酮直接氯代和水解制得2-甲基-2-羟基-1-苯基-1-丁酮。当四氯化碳的用量为12 mL,四丁基溴化铵用量为6 g,氢氧化钠浓度为17%,反应时间为6 h时,产品的收率可达90.3%。通过元素分析、红外光谱分析、质谱对产品进行了结构表征。 相似文献
16.
以煤系高岭土为原料,通过插层反应,成功制备了高岭土纳米管,管的内径为8~25 nm,长度为0.1~0.5 μm,长径大,均一性好。选用3种季铵盐表面活性剂:十六烷基三甲基氯化铵(CTAC)、十六烷基三甲基溴化铵(CTAB)和十二烷基三甲基溴化铵(DTAB)对高岭土纳米管进行改性,考察了不同种类、不同浓度的表面活性剂分子对高岭土纳米管结构和吸附脱硫性能的影响。结果表明,经过表面活性剂改性后高岭土纳米管的吸附脱硫能力有所增强,尤其以0.5 mol/L CTAC甲醇溶液改性后,高岭土纳米管的脱硫率有明显增加,从原来40.5%增加到60.3%。 相似文献
17.
用恒电流法研究Fe(Ⅲ)EDTA对银的氧化过程 总被引:1,自引:3,他引:1
刘春艳 《感光科学与光化学》1990,(1):41-48
本文采用银旋转圆盘电极,在氟离子、溴离子、碘离子以及其他照相辅加剂存在下对Fe(Ⅲ)EDTA氧化金属银的过程进行了研究,以恒电流法做为检测手段,初步探讨了Fe(Ⅲ)EDTA络合物对金属银漂白过程机理。实验揭示了各种卤离子在Fe(Ⅲ)EDTA对银的氧化过程中的行为。pH和Fe(Ⅲ)EDTA浓度对该氧化还原反应的影响,以及某些含有巯基的化合物对Fe(Ⅲ)EDTA氧化反应的加速作用机理。 相似文献
18.
高纯度支链三烷基苯磺酸钠的合成与表面活性 总被引:6,自引:1,他引:5
以短碳链烷基苯为原料,经酰化反应、格氏反应、催化加氢及磺化等六步反应合成了6种支链1,4,5 三烷基苯 3 磺酸钠,总收率均在21%以上。在烷基苯磺酸盐分子中,主链(—CHR1R2)取代在苯环的1位,短链R和R3分别取代在4位和5位。合成的三烷基苯磺酸盐的结构如下:(Ⅰ)R1=C3H7,R2=C4H9,R3=R=C2H5;(Ⅱ)R1=C4H9,R2=C4H9,R3=R=C2H5;(Ⅲ)R1=C4H9,R2=C5H11,R3=R=C2H5;(Ⅳ)R1=C3H7,R2=C4H9,R3=n C3H7,R=i C3H7;(Ⅴ)R1=C4H9,R2=C4H9,R3=n C3H7,R=i C3H7;(Ⅵ)R1=C4H9,R2=C5H11,R3=n C3H7,R=i C3H7。用1HNMR鉴定了所合成的表面活性剂的结构,用两相滴定法测定了产品中支链三烷基苯磺酸钠的质量分数均在98%以上。用表面张力法测定了30℃时它们在水溶液中的临界胶束浓度(CMC)和最低表面张力(γCMC)。6种表面活性剂的CMC(mmol/L)和γCMC(mN/m)分别为4 3,31 78(Ⅰ);4 1,31 05(Ⅱ);2 8,30 75(Ⅲ);4 0,30 85(Ⅳ);2 0,30 50(Ⅴ);1 0,30 48(Ⅵ)。 相似文献
19.
The copolymer prepared by copolymerizing with acrylamide and maleic anhydride was imidized with N,N-dimethylaminopropylamine. The obtained acrylamide–N,N-dimethylaminopropylmaleimide (ADMAPM) copolymer was then reacted with methyl iodide to yield a poly(methyl iodide quaternized acrylamide–N,N-dimethylaminopropylmaleimide) copolymer [poly(MIQADMAPM)]. Its aqueous solution properties were studied by measurements of reduced viscosity, intrinsic viscosity, and flocculation test in this study. The reduced viscosity and intrinsic viscosity of this cationic polyelectrolyte were related to the types and concentration of the added salt. “Soft” salt anions were more easily bound to the quaternary ammonium cation (R4N+) of poly(MIQADMAPM) than were “hard” salt anions. Halide anions are hard anions; consequently, hard cations were more easily attracted to halide anions and reduced the binding degree of halide anion on the quaternary ammonium group (R4N+). The intrinsic viscosity behavior for cationic polyelectrolyte resulting from the electrostatic repulsive force of the polymer chain was contrasted with polyampholyte. The effect of various flocculants on flocculation in different pH values was accessed in this study. © 1996 John Wiley & Sons, Inc. 相似文献