摘要:
A process is described of pyrolyzing at least one perfluorinated hydrocarbon, or a material containing at least one perfluorinated hydrocarbon, in the presence of hydrogen, to yield a reaction mixture containing difluorocarbene.
摘要:
A process is described of pyrolyzing at least one perfluorinated hydrocarbon, or a material containing at least one perfluorinated hydrocarbon, in the presence of hydrogen, to yield a reaction mixture containing difluorocarbene.
摘要:
Method of making fluoropolymers by emulsion polymerization of one or more fluorinated monomers in an aqueous phase in the presence of a fluorinated emulsifier, said method comprises adding a doping agent in a weight ratio with respect to the emulsifier of from about 1:2 to about 1:20, said doping agent has a melting point of equal or less than 30° C. and a boiling point of at least about 100° C. and is selected from the group consisting of fluorinated cyclic hydrocarbons, fluorinated polyoxyalkenes, fluorinated alkenes and fluorinated polyoxyalkenes.
摘要:
Method of making fluoropolymers by emulsion polymerization of one or more fluorinated monomers in an aqueous phase in the presence of a fluorinated emulsifier, said method comprises adding a doping agent in a weight ratio with respect to the emulsifier of from about 1:2 to about 1:20, said doping agent has a melting point of equal or less than 30° C. and a boiling point of at least about 100° C. and is selected from the group consisting of fluorinated cyclic hydrocarbons, fluorinated polyoxyalkenes, fluorinated alkenes and fluorinated polyoxyalkenes.
摘要:
There is provided a fluoroelastomer characterized by containing one type or more types of fluorinated emulsifiers represented by the formula: F—(CF2)t-[O(CF2)n]m-O—(CHF)o-(CF2)p-X where m=0 to 3; n=1 to 5; o=0 to 1; p=1 to 3; t=1 to 10; and where when t=2 than o≠0; and further where X is selected from a group consisting of a carboxyl acid group and a salt of a carboxylic acid group. A method for preparing fluoroelastomers by using such fluorinated emulsifiers in emulsion polymerization of fluoromonomers and articles containing such fluoroelastomers are also provided. A fluorinated elastomer dispersion including an aqueous mixture of a crosslinkable fluorinated elastomer and such fluorinated emulsifiers are also provided. The fluoroelastomers created with such fluorinated emulsifiers are essentially free of cations other than NH4+ and H+ and have a low glass transition temperature.
摘要翻译:提供一种含氟弹性体,其特征在于含有一种或多种由式F-(CF 2)t- [O(CF 2)n] m O - (CHF)o - (CF 2)p X表示的氟化乳化剂,其中m = 0 到3; n = 1〜5; o = 0至1; p = 1〜3; t = 1〜10; 并且当t = 2时,o <0; 并且进一步其中X选自羧酸基团和羧酸基团的盐。 还提供了通过使用这种氟化乳化剂在含氟单体和含有这些含氟弹性体的制品的乳液聚合中制备含氟弹性体的方法。 还提供了包含可交联氟化弹性体和这种氟化乳化剂的水性混合物的含氟弹性体分散体。 用这种氟化乳化剂生产的含氟弹性体基本上不含NH 4+和H +以外的阳离子,并具有低的玻璃化转变温度。
摘要:
There is provided a fluoroelastomer characterized by containing one type or more types of fluorinated emulsifiers represented by the formula: F—(CF2)t-[O(CF2)n]m-O—(CHF)o-(CF2)p-X where m=0 to 3; n=1 to 5; o=0 to 1; p=1 to 3; t=1 to 10; and where when t=2 than o≠0; and further where X is selected from a group consisting of a carboxyl acid group and a salt of a carboxylic acid group. A method for preparing fluoroelastomers by using such fluorinated emulsifiers in emulsion polymerization of fluoromonomers and articles containing such fluoroelastomers are also provided. A fluorinated elastomer dispersion including an aqueous mixture of a crosslinkable fluorinated elastomer and such fluorinated emulsifiers are also provided. The fluoroelastomers created with such fluorinated emulsifiers are essentially free of cations other than NH4+ and H+ and have a low glass transition temperature.
摘要翻译:提供一种含氟弹性体,其特征在于含有一种或多种由式F-(CF 2)t- [O(CF 2)n] m O - (CHF)o - (CF 2)p X表示的氟化乳化剂,其中m = 0 到3; n = 1〜5; o = 0至1; p = 1〜3; t = 1〜10; 其中当t = 2时,o≠0; 并且进一步其中X选自羧酸基团和羧酸基团的盐。 还提供了通过使用这种氟化乳化剂在含氟单体和含有这些含氟弹性体的制品的乳液聚合中制备含氟弹性体的方法。 还提供了包含可交联氟化弹性体和这种氟化乳化剂的水性混合物的含氟弹性体分散体。 用这种氟化乳化剂生产的含氟弹性体基本上不含NH 4+和H +以外的阳离子,并具有低的玻璃化转变温度。
摘要:
Described herein is a process for making PTFE having a standard specific gravity of less than 2.160 g/cm3 comprising: polymerizing a tetrafluoroethylene monomer in an aqueous medium comprising an emulsifier and an initiator in a reaction vessel and contacting the aqueous medium with a fluorinated polyether. Also described herein are the polymerizable compositions and articles thereof.
摘要:
Described herein is a process for making PTFE having a standard specific gravity of less than 2.160 g/cm3 comprising: polymerizing a tetrafluoroethylene monomer in an aqueous medium comprising an emulsifier and an initiator in a reaction vessel and contacting the aqueous medium with a fluorinated polyether. Also described herein are the polymerizable compositions and articles thereof.
摘要翻译:本文描述了制备标准比重小于2.160g / cm 3的PTFE的方法,包括:在反应容器中将包含乳化剂和引发剂的水性介质中的四氟乙烯单体聚合并使含水介质与氟化聚醚接触。 本文还描述了可聚合组合物及其制品。