摘要:
Use of additives of the classes of mono- and/or di-hydroxypolyfluoroethers comprising the fluoropolyoxyalkylenic repeating units chosen from the following ones: (C.sub.3 F.sub.6 O); (CFXO) wherein X=F, CF.sub.3 ; (CH.sub.2 CF.sub.2 CF.sub.2 O); (CF.sub.2 (CF.sub.2).sub.z CF.sub.2 O) wherein z is an integer equal to 1 or 2; (C.sub.2 F.sub.4 O), in curable compositions of fluoroelastomers to improve the coefficient of friction without lowering the adhesion with bonding agents to metal reinforcements.
摘要:
Use in curable fluoroelastomer compositions of additives having polyacetal structure of general formula: HOCH2—[Rf—CH2O(CH2O)cCH2]t—Rf—CH2OH (I) wherein: c=1-10, preferably 1-3; t=0.5-20. Rf=poly-fluorooxyalkylenic chain, having number average molecular weight ({overscore (M)}n) in the range 500-2,500, preferably 1,000-2,000; the number average molecular weight of the formula (I) additive is in the range 3,000-15,000, preferably 3,000-10,000.
摘要翻译:在具有以下通式的聚缩醛结构的添加剂的可固化含氟弹性体组合物中使用:其中:c = 1-10,优选1-3; t = 0.5-20.Rf =数均分子量({overscore(M)} n)在500-2,500,优选1,000-2,000范围内的聚氟氧烷基链;式(I)的数均分子量 添加剂在3,000-15,000,优选3,000-10,000的范围内。
摘要:
1) Disclosed herein are new fluorine-containing compounds having polyacetalic structure, of general formula:[Rf.sub.m --CH.sub.2 O(CH.sub.2 O).sub.c --CH.sub.2 --.brket close-st..sub.n (I)where:Rf=a perfluorooxyalkylene chain having Mn from 500 to 5,000;m=4-25;c=1-10;n=2-100.2) A process for preparing them which comprises carrying out the polycondensation of diols having formula:HORfOH (II)with formaldehyde, in mass or in the presence of solvents, in an acid medium. The compounds of formula (I) can be oligomeric compounds (polymerization degree x.sub.n from 2 to about 20) or polymeric compounds (x.sub.n from about 20 to about 100). They exhibit a high stability to heat and to chemical agents, and Tg values slightly different from the ones of the diols utilized for preparing them.
摘要翻译:1)本文公开了具有以下通式的具有聚缩醛结构的新的含氟化合物:[Rfm-CH2O(CH2O)c-CH2- + 548n(I))其中:Rf =具有+ E的全氟氧化烯链,ovs M + EE n从500到5,000; m = 4-25; c = 1-10; n = 2-100。 2)一种制备它们的方法,其包括在酸性介质中,以质量或在溶剂存在下,将具有式:HORFOH(II)的二醇与甲醛缩聚。 式(I)化合物可以是低聚化合物(聚合度+ E,ovs x + EE n从2至约20)或聚合化合物(+ E,ovs x + EE n约20至约100)。 它们对热和化学试剂表现出高稳定性,并且Tg值与用于制备它们的二醇的那些略有不同。
摘要:
1) New fluorine-containing compounds having polyacetalic structure, of general formula:(I)[Rf.sub.m --CH.sub.2 O(CH.sub.2 O).sub.c --CH.sub.2 ].sub.nwhere:Rf=a perfluorooxyalkylene chain having Mn from 500 to 5,000;m=4-25;c=1-10;n=2-100.2) A process for preparing them, which comprises carrying out the polycondensation of diols having formula:(II) HORfOHwith formaldehyde, in mass or in the presence of solvents, in an acid medium. The compounds of formula (I) can be oligomeric compounds (polymerization degree x.sub.n from 2 to about 20) or polymeric compounds (x.sub.n from about 20 to about 100). They exhibit a high stability to heat and to chemical agents, and Tg values slightly different from the ones of the diols utilized for preparing them.
摘要翻译:1)具有通式:(I)[Rfm-CH 2 O(CH 2 O)c -CH 2] n]的具有聚缩醛结构的新的含氟化合物,其中:Rf =具有500-5,000的<上升&Mn的全氟氧化烯链; m = 4〜25; c = 1-10; n = 2-100。 2)一种制备它们的方法,其包括在酸性介质中以质量或在溶剂存在下,使式(II)HORFOH与甲醛进行缩聚反应。 式(I)的化合物可以是低聚化合物(聚合度和上限,从2到约20)或聚合化合物(和从约20到约100)。 它们对热和化学试剂表现出高稳定性,并且Tg值与用于制备它们的二醇的那些略有不同。
摘要:
Cross-linked macromolecular products having the structure of perfluoropolyethers in which the cross-linking is due to C--C links between carbon atoms of different perfluoropolyether chains, said cross-linked products being obtained by treatment by means of U.V. radiations of the corresponding perfluoropolyethers containing at least three groups: ##STR1## arranged along the chain and at one or at both ends; the C--C link of cross-linking coming from the removal of two groups: ##STR2## of different perfluoropolyether chains.
摘要:
Vulcanizable compositions of fluoroelastomers based on vinylidene fluoride with one or more monomers containing an ethylene unsaturation and at least one fluorine atom, having improved processability and improved chemical stability, and comprising, as a processing coadjuvant, a mono- or dihydroxypolyfluoroether having a means molecular weight higher than or equal to 400 for the monohydroxypolyfluoroethers and higher than or equal to 2500 for the dihydroxypolyfluoroethers.
摘要:
New products having the structure of arylphosphines or of derivatives of arylphosphines with an oxygen or sulphur atom directly bonded to the phosphorus atom, containing perfluoroalkylether chains, characterized in that such chains are bonded to the benzene ring through a non-perfluorinated bridge, and are obtained by a process substantially decreasing their production costs, and suitable to be used as stabilizers of perfluoropolyether oils and greases to prevent their degradation in the presence of metals, and the corrosion of the same metals, such as, e.g., Al, Ti, V, or their alloys, when operating in oxidizing and high-temperature environments.
摘要:
A new class of elastomeric copolymers the chains of which contain perfluoropolyether radicals having a linear structure linked through cycloimide groups to organic radicals of different and suitable structure is disclosed, as well as a process for preparing such copolymers which comprises condensing a mixture of fluorinated polyether diamines with one or more tetracarboxylic dianhydrides or esters.
摘要:
Fluoropolyethers having functional groups, consisting of randomly distributed sequences of perfluoropolyoxyalkylene units selected from: ##STR1## and included in one of the following formulas: ##STR2## where X is F or CF.sub.3 T, T', T"=a perfluoroalkyl group containing from 1 to 3 carbon atoms and one or two atoms of Cl, Br or I;R, R'=halogen atoms;Y=a functional group;o, q=numbers, zero included, such that o+q=1-20;n=a number ranging from 1 to 15;m/n=a number ranging from 0.01 to 0.5;p=a number ranging from 1 to 20;s/p=a number ranging from 0.5 to 2; andz/o+p=a number ranging from 0.01 to 0.05.
摘要翻译:具有官能团的含氟聚醚,由选自以下的全氟聚氧化烯单元的随机分布序列组成:图像(I)T'O(CF 2 CF 2 O)p(CF 2 O)s CR R'Y(II)(III)其中 X是F或CF 3 T,T',T“=含有1至3个碳原子和1或2个Cl,Br或I原子的全氟烷基; R,R'=卤素原子; Y =官能团; o,q =数字,包括零,使得o + q = 1-20; n = 1到15之间的数字; m / n = 0.01〜0.5的数; p = 1到20之间的数字; s / p =从0.5到2的数字; z + o + p = 0.01〜0.05的数。
摘要:
Polishes for metal surfaces, based on dispersions of waxes, fluorinated polymers and perfluoropolyoxyalkylene oils acquire high gloss characteristics combined with improved water-repellency and resistance to soiling of 0.1-5% by weight of at least a cationic emulsifier comprised in the general formula(I) R-L-Q.sup.+ X.sup.-where:R=a chain of perfluoropolyoxyalkylene units;L=a divalent organic group;Q=a polar group;X=a halogen, or a group of formulaCH.sub.3 -Phenylene-SO.sub.3.sup.-R"SO.sub.3.sup.-R"=F-(CF.sub.2).sub.m -;t=1 or 2;m=1-4.The polished containing the emulsifiers of formula (I) as well as the compounds comprised in said formula are claimed as new products.
摘要翻译:基于蜡,氟化聚合物和全氟聚氧化烯油的分散体,金属表面的抛光剂获得高光泽特性,结合改善的防水性和耐污染性至少为通式(I)所包含的至少一种阳离子乳化剂0.1-5重量% )RL-Q + X-其中:R =全氟聚氧化烯单元链; L =二价有机基团; Q =极性基团; X =卤素或式为CH 3 - 亚苯基-SO 3 -R'SO 3 -R“= F-(CF 2)m - 基团; t = 1或2; m = 1-4。 含有式(I)的乳化剂的抛光剂以及所述式中包含的化合物被称为新产品。