摘要:
Described are fibers comprising a polyoxymethylene copolymer having an ISO 1133 MVR melt index (determined at 190° C. under a load of 2.16 kg) in the range from 0.3 to 30 ml/10 min which possess a bend recovery (measured by the double loop method in air and/or water) of not less than 125°. These fibers are useful in brushes.
摘要:
Described are fibers comprising a polyoxymethylene copolymer having an ISO 1133 MVR melt index (determined at 190° C. under a load of 2.16 kg) in the range from 0.3 to 30 ml/10 min which possess a bend recovery (measured by the double loop method in air and/or water) of not less than 125° C. These fibers are useful in brushes.
摘要:
Multiblock copolymers are described and contain the structural unit of formula I -A-O—R1—O—CO—(R2—CO—)m—X-D-X—(CO—R2)m—CO—X— (I), where A is a radical derived from a homo- or copolyoxymethylene, R1 is an alkylene radical-having at least two carbon atoms or a cycloalkylene radical, R2 is a direct carbon-carbon bond, or an alkylene, cycloalkylene, arylene, or aralkylene radical, X is selected from —O—, —S—, or —NH—, D is a divalent radical B which is a radical of a hydroxy-terminated, mercaptan-terminated, or amino-terminated polymer which derives from polyalkylene glycols, polyvinyl ethers, polyvinyl ether-alkene copolymers, polyvinyl esters, polyvinyl ester-alkene copolymers, polyvinyl alcohols, polyvinyl alcohol-alkene copolymers, polyvinylaromatics, polyacrylates, polymethacrylates, polyacetals, polycarbonates, polyesters, polyamides, polyimines, polyetherester elastomers, polyetheramide elastomers, polyalkadienes, polyurethanes, polyureas, polysiloxanes, or a triblock copolymer radical -PAO-B-PAO-, where B assumes one of the above meanings and PAO is a polyalkylene oxide radical, and m is 0 or 1. The multiblock copolymers may be used to produce moldings.
摘要:
Homo- or copolyoxymethylenes are described and contain the repeat structural unit of formula I -A-O—R1—O—CO—(R2—CO—)m—O— (I), where A is a radical derived from a homo- or copolyoxymethylene, R1 is an alkylene radical having at least two carbon atoms, or a cycloalkylene radical, R2 is a direct carbon-carbon bond, or an alkylene, cycloalkylene, arylene, or aralkylene radical, and m is 0 or 1. These polymers may be prepared by reacting end-group-functionalized homo- or copolyoxymethylenes with selected chain-linking agents. The reaction products can be used to produce moldings.
摘要:
Multiblock copolymers are described and contain the structural unit of formula I -A-O—R1—O—CO—(R2—CO—)m—X-D-X—(CO—R2)m—CO—X— (I), where A is a radical derived from a homo- or copolyoxymethylene, R1 is an alkylene radical having at least two carbon atoms, or a cycloalkylene radical, R2 is a direct carbon-carbon bond, or an alkylene, cycloalkylene, arylene, or aralkylene radical, X is selected from —O—, —S—, or —NH—, D is a divalent radical B which is a radical of a hydroxy-terminated, mercaptan-terminated, or amino-terminated polymer which derives from polyalkylene glycols, from polyvinyl ethers, from polyvinyl ether copolymers with alkenes, from polyvinyl esters, from polyvinyl ester copolymers with alkenes, from polyvinyl alcohols, or from polyvinyl alcohol-alkene copolymers, from polyvinylaromatics, from polyacrylates, from polymethacrylates, from polyacetals which have no, or up to 50 mol % of, oxymethylene units, from polycarbonates, from polyesters, from polyamides, from polyimines, from polyetherester elastomers (PEEs), from polyetheramide elastomers (PEAs), from polyalkadienes which may, where appropriate, have been hydrogenated, from polyurethanes, from polyureas, or from polysiloxanes, or is a hydroxy-terminated, mercaptan-terminated, or amino-terminated triblock copolymer radical -PAO-B-PAO-, where B assumes one of the above meanings and PAO is a polyalkylene oxide radical, and m is 0 or 1. The multiblock copolymers may be used to produce moldings.
摘要:
Homo- or copolyoxymethylenes are described and contain the repeat structural unit of formula I -A-O—R1—O—CO—(R2—CO—)m—O— (I), where A is a radical derived from a homo- or copolyoxymethylene, R1 is an alkylene radical having at least two carbon atoms, or a cycloalkylene radical, R2 is a direct carbon-carbon bond, or an alkylene, cycloalkylene, arylene, or aralkylene radical, and m is 0 or 1. These polymers may be prepared by reacting end-group-functionalized homo- or copolyoxymethylenes with selected chain-linking agents.The reaction products can be used to produce moldings.
摘要:
A process for the preparation of polyarylene sulfoxides, in which polyarylene sulfide, suspends in a concentrated acid of formula R--SO.sub.3 H, in which R is a halogen atom Ian OH group, an aliphatic radical having 1 to 6 C atoms or an aromatic radcal having 6 to 18 C atoms, or of the formula R.sup.1 --CR.sup.2 R.sup.3 --COOH, in which R.sup.1 is a halogen atom and R.sup.2 and R.sup.3, independently of one another are each a halogen atom, an aliphatic radical having 1 to 50 atoms or a halogenated aliphatic radical having 1 to 5 C atoms, is oxidized by metering in a 30 to 85% strength hydrogen peroxide solution with thorough mixing and at a temperature of from -20 to +45.degree. C. According to this process, the sulfide units of the polyarylene sulfide are converted virtually selectively and completely into sulfoxide units.
摘要:
Polyesters are disclosed containing at least 0.1 mol % of the structural repeat units of the formula I and optionally up to 99.9 mol % of the structural repeat units of the formula II --O--OC--Ar.sup.1 --CO--O--R.sup.1 -- (I) --O--OC--Ar.sup.2 --CO--O--R.sup.2 -- (II) where Ar.sup.1 is a radical of the formula III and/or of the formula IV and/or of the formula V ##STR1## Ar.sup.2 is a bivalent mono- or polycyclic aromatic radical which differs from the radicals of the formulae III, IV and V, R.sup.1 and R.sup.2 are independently of each other a bivalent cycloaliphatic radical derived from cyclohexanedimethanol, a radical of the formula --.sub.n H.sub.2n -- and/or a radical of the formula --�C.sub.m H.sub.2m --O--!.sub.x --C.sub.m H.sub.2m --, where n is an integer between 2 and 10, m is an integer between 2 and 10, and x is an integer from 1 to 20, Y is a direct C--C bond, --NR.sup.3 --, --S-- or --O--, Z is a direct C--C bond or a bridging group --O--, --C.sub.q H.sub.2q --, --S--, --CO-- or --SO.sub.2 --, q is an integer from 1 to 10, R.sup.3 is a univalent aliphatic, cycloaliphatic, aromatic or araliphatic radical, preferably methyl, R.sup.4 is a radical of the formula --C.sub.o H.sub.2o+1 and/or a radical of the formula --�C.sub.p H.sub.2p --O--!.sub.z --R.sup.5, R.sup.5 is a univalent aliphatic, cycloaliphatic, aromatic or araliphatic radical, preferably methyl, o is an integer from 6 to 30, p is an integer from 2 to 10, y is an integer from 1 to 4, and z is an integer from 1 to 10. The polyesters are notable for a low viscosity and are advantageous to process into shaped structures.
摘要:
The invention relates to a process for using nitric acid to oxidize polyarylene sulfide to polyarylene sulfoxide, oxidizing at least 98% of the sulfide groups of the polyarylene sulfide to sulfoxide groups. According to the invention polyarylene sulfide is treated with nitric acid at a concentration of from 60 to 80% with heating. The polyarylene sulfoxide prepared by the novel process can be used as an excellent chemical blowing agent for foaming thermoplastics.
摘要:
Polyaryiene sulfone fiber material, especially web, is obtained by oxidizing polyarylene sulfide fiber material with a peracid/acid mixture of an organic acid at 60 to 100° C. for 10 seconds to 45 minutes. Since this process provides a substantative degree of oxidation within a very short reaction time, one advantage of the process is that the rapidity of the oxidation renders continuous processes for oxidizing polyarylene sulfide fibers economical.