专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5272248A Polyimide processing additives 失效
标题翻译：聚酰亚胺加工助剂
公开(公告)号：US5272248A
公开(公告)日：1993-12-21
申请号：US892058
申请日：1992-05-22
申请人： J. Richard Pratt , Terry L. St. Clair , Diane M. Stoakley , Harold D. Burks
发明人： J. Richard Pratt , Terry L. St. Clair , Diane M. Stoakley , Harold D. Burks
IPC分类号： C08G73/10 , C08K5/21 , C08K5/3415 , C08G69/26
CPC分类号： C08K5/21 , C08G73/1067 , C08K5/3415
摘要： A process for preparing polyamides having enhanced melt flow properties is described. The process consists of heating a mixture of a high molecular weight poly(amic acid) or polyimide with a low molecular weight amic acid or imide additive in the range of 0.05 to 15% by weight of additive. The polyimide powders so obtained show improved processability, as evidenced by lower melt viscosity by capillary rheometry. Likewise, films prepared from mixtures of polymers with additives show improved processability with earlier onset of stretching by TMA.
摘要翻译：描述了一种制备具有增强的熔体流动性能的聚酰胺的方法。该方法包括将高分子量聚（酰胺酸）或聚酰亚胺与低分子量酰胺酸添加剂的混合物加入0.05至15重量％的添加剂。如此获得的聚酰亚胺粉末显示出改进的加工性能，如通过毛细管流变测定法的较低熔体粘度所证明的。同样，由聚合物与添加剂的混合物制备的薄膜也显示改善的加工性能，并且通过TMA早期开始拉伸。

2. 发明授权

US5116939A Polyimide processing additives 失效
标题翻译：聚酰亚胺加工助剂
公开(公告)号：US5116939A
公开(公告)日：1992-05-26
申请号：US84064
申请日：1987-08-11
申请人： James C. Fletcher , J. Richard Pratt , Terry L. St. Clair , Diane M. Stoakley , Harold D. Burks
发明人： James C. Fletcher , J. Richard Pratt , Terry L. St. Clair , Diane M. Stoakley , Harold D. Burks
IPC分类号： C08G73/10 , C08K5/21 , C08K5/3415
CPC分类号： C08K5/21 , C08G73/1067 , C08K5/3415
摘要： A process for preparing polyimides having enhanced melt flow properties is described. The process consists of heating a mixture of a high molecular weight poly(amic acid) or polyimide with a low molecular weight amic acid or imide additive in the range of 0.05 to 15% by weight of additive. The polyimide powders so obtained show improved processability, as evidenced by lower melt viscosity by capillary rheometry. Likewise, films prepared from mixtures of polymers with additives show improved processability with earlier onset of stretching by TMA.
摘要翻译：描述了制备具有增强的熔体流动性能的聚酰亚胺的方法。该方法包括将高分子量聚（酰胺酸）或聚酰亚胺与低分子量酰胺酸添加剂的混合物加入0.05至15重量％的添加剂。如此获得的聚酰亚胺粉末显示出改进的加工性能，如通过毛细管流变测定法的较低熔体粘度所证明的。同样，由聚合物与添加剂的混合物制备的薄膜也显示改善的加工性能，并且通过TMA早期开始拉伸。

3. 发明授权

US4837300A Copolyimide with a combination of flexibilizing groups 失效
标题翻译：具有柔性基团组合的共聚酰亚胺
公开(公告)号：US4837300A
公开(公告)日：1989-06-06
申请号：US71686
申请日：1987-07-09
申请人： Terry L. St. Clair , Harold D. Burks , Donald J. Progar
发明人： Terry L. St. Clair , Harold D. Burks , Donald J. Progar
IPC分类号： C08G73/10
CPC分类号： C08G73/1067 , C08G73/10 , C08G73/1039 , C08G73/1042 , C08G73/1046 , C08G73/1064 , C08G73/1071
摘要： Novel copolyimides are prepared by reacting one or more aromatic dianhydrides with a meta-substituted phenylene diamine and an aromatic bridged diamine. The incorporation of meta-substituted phenylene diamine derived units and bridged aromatic diamine derived units into the linear aromatic polymer backbone results in a copolyimide of improved flexibility, processability, and melt-flow characteristics. The novel copolyimides are especially useful as thermoplastic hot-melt adhesives.
摘要翻译：通过使一种或多种芳族二酸酐与间位取代的苯二胺和芳族桥连二胺反应制备新型共聚酰亚胺。将间位取代的苯二胺衍生的单元和桥连的芳族二胺衍生的单元并入线性芳族聚合物主链中导致具有改进的柔性，加工性和熔体流动特性的共聚酰亚胺。新型共聚酰亚胺特别适用于热塑性热熔胶。

4. 发明授权

US4552931A Process of end-capping a polyimide system 失效
标题翻译：封端聚酰亚胺系统的工艺
公开(公告)号：US4552931A
公开(公告)日：1985-11-12
申请号：US649328
申请日：1984-09-11
申请人： Terry L. St. Clair , Harold D. Burks
发明人： Terry L. St. Clair , Harold D. Burks
IPC分类号： C08G73/10
CPC分类号： C08G73/1064 , C08G73/1014 , C08G73/1017 , C08G73/1071
摘要： A process of endcapping a polyimide system with an endcapping agent in order to achieve a controlled decrease in molecular weight and melt viscosity along with predictable fracture resistance of the molded products is disclosed. The uncapped system is formed by combining an equimolar ratio of 4,4'-bis(3,4-dicarboxyphenoxy) diphenylsulfide dianhydride (BDSDA) and 1,3-bis(aminophenoxy)benzene (APB) dissolved in bis(2-methoxyethyl)ether. The endcapped system is formed by dissolving APB in bis-(2-methoxyethyl)ether, adding the endcapping agent, and then adding the BDSDA. By varying the amount of endcapping from 0 to 4%, molecular weight is decreased from 13,900 to 8660. At a processing temperature of 250.degree. C., there is a linear relationship between molecular weight and viscosity, with the viscosity decreasing by two orders of magnitude as the molecular weight decreased from 13,900 to 8660. A greater drop in viscosity is noted at higher temperatures. Apparent viscosity as a function of molecular weight at 250.degree. C. and at 280.degree. C. is depicted in FIG. 2. Reducing the molecular weight also results in a linear decrease in the fracture resistance from 4100 J/m.sup.2 to 296 J/m.sup.2, as shown in FIG. 1.
摘要翻译：公开了一种使用封端剂封端聚酰亚胺系统以便实现分子量和熔体粘度的受控降低以及模制产品的可预测的耐断裂性的方法。未封端的体系是通过将等摩尔比的4,4'-双（3,4-二羧基苯氧基）二苯硫醚二酐（BDSDA）和1,3-双（氨基苯氧基）苯（APB））溶于双（2-甲氧基乙基）醚。通过将APB溶解在双（2-甲氧基乙基）醚中，加入封端剂，然后加入BDSDA形成封端体系。通过将封端量从0降低到4％，分子量从13,900降低到8660.在250℃的加工温度下，分子量和粘度之间存在线性关系，粘度降低了两个数量级随着分子量从13,900降低到8660.在较高的温度下，粘度的下降更大。在250℃和280℃下作为分子量的函数的表观粘度如图1所示。降低分子量也导致断裂阻力从4100J / m 2到296J / m 2的线性降低，如图2所示。 1。

5. 发明授权

US4444979A Polyphenylene ethers with imide linking groups 失效
标题翻译：聚亚苯基醚与酰亚胺连接基团
公开(公告)号：US4444979A
公开(公告)日：1984-04-24
申请号：US469866
申请日：1983-02-25
申请人： Terry L. St. Clair , Harold D. Burks
发明人： Terry L. St. Clair , Harold D. Burks
IPC分类号： C08G73/00 , C08G73/10
CPC分类号： C08G73/1064 , C08G73/1053 , C08G73/1071
摘要： Novel polyphenylene ethers with imide linking units are disclosed. These polymers incorporate the solvent and thermal resistance of polyimides and the processability of polyphenylene ethers. Improved physical properties over those of the prior art are obtained by incorporating meta linked ethers and/or polyphenylene oxides into the polymer backbone. A novel process for making polymers of this type is also disclosed. The process is unique in that the expected need of high process temperatures and/or special atmospheres are eliminated.
摘要翻译：公开了具有酰亚胺连接单元的新型聚苯醚。这些聚合物结合聚酰亚胺的溶剂和耐热性以及聚苯醚的加工性。通过将间接连接的醚和/或聚苯醚掺入聚合物主链中，获得了比现有技术更好的物理性能。还公开了一种制备这种类型的聚合物的新方法。该方法是独特的，因为预期需要高的工艺温度和/或特殊的气氛被消除。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式