摘要:
Process for preparing a polyarylene sulfone by oxidizing a polyarylene thioether in acetic acid with hydrogen peroxide, the reaction being carried out in the presence of catalytic amounts of concentrated sulfuric acid and/or with the addition of equilibrium per-acids. The reaction products are suitable for producing molded parts having high temperature resistance and high resistance to chemicals.
摘要:
Polyarylene thioethers having recurring units of the formula[--(S--E--).sub.a --(--SO--E--).sub.b --(SO.sub.2 --E).sub.c --](I)in which E are, independently of one another, phenylene, naphthylene or biphenylene, a and c have, independently of one another, values from 0 to less than 1 and b has values from greater than zero to less than 1, with the proviso that the sum of a+b+c is equal to 1 and at least two of the indices are greater than zero, are obtained by oxidation of polyarylene sulfides in two stages, wherein in the first stage a polymer in solid form in a suspension medium is oxidized with ozone and the reaction product obtained is in the second stage reacted in acetic acid with hydrogen peroxide in the presence of catalytic amounts of concentrated sulfuric acid and/or with addition of equilibrium per-acids. The polyarylene thioethers are suitable for the production of molded parts having high temperature resistance and high resistance to chemicals.
摘要:
Process for oxidizing a polymer containing thioether groups, in which the polymer in solid form in a suspension medium is oxidized with ozone. The polymer obtained is suitable for the production of functional parts on which high demands are made.
摘要:
A filter material based on a polyarylene thioether having repeating units of the formula--[(Ar.sup.1).sub.n --X)].sub.m --[(Ar.sup.2).sub.i --Y)].sub.j --[(Ar.sup.3).sub.k --Z)].sub.l --[(Ar.sup.4).sub.o --W)].sub.p --(I)in which Ar.sup.1, Ar.sup.2, Ar.sup.3, Ar.sup.4, W, X, Y and Z, independently of each other, are identical or different, the indices n, m, i, j, k, l, o and p, independently of each other, are zero or integers 1, 2, 3 or 4, their sum being at least 2, Ar.sup.1, Ar.sup.2, Ar.sup.3 and Ar.sup.4 are arylene systems having 6 to 18 carbon atoms, and W, X, Y and Z are divalent linking groups, selected from --SO.sub.2 --, --S--, --SO--, --CO--, --O--, --CO.sub.2 --, or alkylene groups or alkylidene groups having 1 to 6 carbon atoms is suitable for removing ozone from gases or liquids. The removal proceeds quantitatively, no volatile products being formed.
摘要翻译:基于具有式[[(Ar 1)n X)] m - [(Ar 2)i Y)] j - [(Ar 3)k Z)] - [(Ar 4)o W)] p]的重复单元的聚芳硫醚的过滤材料 - (I)其中Ar1,Ar2,Ar3,Ar4,W,X,Y和Z彼此独立地相同或不同,指数n,m,i,j,k,l,o和p, 彼此独立,为零或整数1,2,3或4,它们的和为至少2,Ar 1,Ar 2,Ar 3和Ar 4为具有6至18个碳原子的亚芳基体系,W,X,Y和Z分别为 选自-SO 2 - , - S - , - SO - , - CO - , - O - , - CO 2 - 或具有1至6个碳原子的亚烷基或亚烷基的二价连接基团适用于从气体或 液体。 清除量定量进行,不形成挥发性物质。
摘要:
Oxidation product of polyarylene sulfides comprising recurring units of the formula.brket open-st.C.sub.6 H.sub.4 --S.brket close-st. (I)in the form of a compound comprising recurring units of the formula.brket open-st..paren open-st.C.sub.6 H.sub.4 --S.paren close-st..sub.a .paren open-st.C.sub.6 H.sub.4 --SO.paren close-st..sub.b .brket close-st.(II)in which the sulfur/oxygen ratio is from 1:0.1 to 1:1, the sum of a and b always being 1 and a and b each being greater than zero or with the proviso that a is zero if b is 1.
摘要:
A filter material based on a polyarylene thioether having repeating units of the formula--[(Ar.sup.1).sub.n --X)].sub.m --[(Ar.sup.2).sub.i --Y)].sub.j --[(Ar.sup.3).sub.k --Z)].sub.1 --[(Ar.sup.4).sub.o --W)].sub.p --(I)in which Ar.sup.1, Ar.sup.2, Ar.sup.3, Ar.sup.4, W, X, Y and Z, independently of each other, are identical or different, the indices n, m, i, j, k, l, o and p, independently of each other, are zero or integers 1, 2, 3 or 4, their sum being at least 2, Ar.sup.1, Ar.sup.2, Ar.sup.3 and Ar.sup.4 are arylene systems having 6 to 18 carbon atoms, and W, X, Y and Z are divalent linking groups, selected from --SO.sub.2 --, --S--, --SO--, --CO--, --O--, --CO.sub.2 --, or alkylene groups or alkylidene groups having 1 to 6 carbon atoms is suitable for removing ozone from gases or liquids. The removal proceeds quantitatively, no volatile products being formed.
摘要翻译:基于具有式[[(Ar1)nX)] m - [(Ar2)iY)] j - [(Ar3)kZ)] 1 - [(Ar4)oW)] p]的重复单元的聚芳硫醚的过滤材料 - (I)其中Ar1,Ar2,Ar3,Ar4,W,X,Y和Z彼此独立地相同或不同,指数n,m,i,j,k,l,o和p, 彼此独立,为零或整数1,2,3或4,它们的和为至少2,Ar 1,Ar 2,Ar 3和Ar 4为具有6至18个碳原子的亚芳基体系,W,X,Y和Z分别为 选自-SO 2 - , - S - , - SO - , - CO - , - O - , - CO 2 - 或具有1至6个碳原子的亚烷基或亚烷基的二价连接基团适用于从气体或 液体。 清除量定量进行,不形成挥发性物质。
摘要:
A method for removing oxides of nitrogen from gases and liquids by contacting a NO.sub.x containing gas or liquid with a polyarylene thioether filter material and a solid oxidizing agent having an electron potential greater than 0.96 V, wherein the solid oxidizing agent oxidizes NO into NO.sub.2 which is removed by the polyarylene thioether filter material.
摘要:
The invention relates to a thermoplastic composition which comprises vinyl chloride polymers and chlorinated polyethylene and which contains finely divided fluoropolymers and has a markedly improved processability, particularly when shaped by extrusion.
摘要:
In the process for the preparation, with simultaneous end group stabilization, of polyacetal copolymers in a homogeneous phase and working up thereof, cyclic formaldehyde oligomers are copolymerized with cyclic acetals in the presence of an initiator in a polymerization reactor and immediately thereafter the initiator is deactivated by addition of basic substances, the unstable chain ends being degraded down to 0.01% to 1% in the presence of residual monomer, the product losing the majority of the residual monomer at the reactor outlet by letting down into a pelletizing device and the residual monomer which remains and the impurities dissolved in the product being removed by extraction with solvents and the product being pelletized, after drying and stabilization.
摘要:
A process for efficiently producing a hollow molding or a sheet- or rod-shaped molding includes subjecting a composition containing a polyoxymethylene copolymer resin having substantially a linear molecular structure and a melt flow index (MI) value (190.degree. C., 2160 g load) of 0.1 to 2.0 g/10 min to blow -molding or extrusion-molding operations. The preferred polyoxymethylene copolymer is prepared by copolymerizing trioxane as the principle monomer with a cyclic ether or cyclic formal comonomer in the presence of 1.times.10.sup.-3 to 1.times.10.sup.-2 molar % of a boron trifluoride catalyst or a coordination compound thereof, while regulating the chain-terminating or chain-transferring impurities in the reaction system to 1.times.10.sup.-2 molar % or less, and then cooling the product obtained to a temperature of 45.degree. or below within 30 seconds so as to deactivate the catalyst.