A highly hygroscopic sea-island type composite fiber has characteristics (1)-(4) below: (1) the island component in a polymer has hygroscopicity; (2) the ratio of the outermost layer thickness T to the fiber diameter R in a cross section of the fiber is 0.05-0.25; (3) the difference (MR) in moisture absorption rate after hot water treatment is 2.0-10.0%; and (4) the content of a phenol group is 16-160 mmol/kg, wherein the outermost layer thickness is the difference between the radius of the fiber and the radius of a circumscribed circle connecting the vertices of the island component disposed at the outermost circumference, and represents the thickness of the sea component present in the outermost layer.

The present invention relates to polyketone molding compounds based on partially crystalline, aliphatic polyketones. In particular, it relates to halogen-free, flameproof molding compounds based on aliphatic polyketones which preferably comprise salts of phosphinic acids as flame retardant. The molding compounds fulfill the fire protection classification V0 according to UL94 and display good mechanical properties. These molding compounds are suitable for the production of in particular thin-walled molded articles for the electrical and electronics industry, such as for example housings, housing components or connectors.

The present invention relates to polyketone molding compounds based on partially crystalline, aliphatic polyketones. In particular, it relates to halogen-free, flameproof molding compounds based on aliphatic polyketones which preferably comprise salts of phosphinic acids as flame retardant. The molding compounds fulfill the fire protection classification V0 according to UL94 and display good mechanical properties. These molding compounds are suitable for the production of in particular thin-walled molded articles for the electrical and electronics industry, such as for example housings, housing components or connectors.

Polycarbonate compositions comprising one or more additives selected from the group consisting of benzofuranone stabilizers of formula I, wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are each independently hydrogen, halogen, hydroxy, C.sub.1-C.sub.25alkyl, C.sub.2-C.sub.25alkenyl, C.sub.2-C.sub.25alkynyl, C.sub.7-C.sub.9phenylalkyl, phenyl, C.sub.5-C.sub.8cycloalkyl, C.sub.1-C.sub.18alkoxy, C1-C8alkylamine, di(C1-C8alkyl)amino, C.sub.1-C.sub.25alkanoyloxy, C.sub.1-C.sub.25alkanoylamino, C.sub.3-C.sub.25alkenoyloxy, C.sub.3-C.sub.25alkanoyloxy interrupted by one to three O, S, NH or N(C.sub.1-C.sub.8alkyl)-, wherein C.sub.1-C.sub.25alkyl, C.sub.2-C.sub.25alkenyl, C.sub.2-C.sub.25alkynyl, C.sub.7-C.sub.9phenylalkyl, phenyl, C.sub.5-C.sub.8cycloalkyl, C.sub.1-C.sub.18alkoxy, C.sub.1-C.sub.8alkylamine, di(C1-C8alkyl)amino, C.sub.1-C.sub.25alkanoyloxy, C.sub.1-C.sub.25alkanoylamino, C.sub.3-C.sub.25alkenoyloxy and interrupted C.sub.3-C.sub.25alkenoyloxy are unsubstituted or substituted by one to three groups selected from halogen, hydroxy, thiol, amino, C.sub.1-C.sub.4alkylamino, di(C.sub.1-C.sub.4alkyl)amino and C.sub.1-C.sub.4alkyl.

##STR00001##

Polycarbonate compositions comprising one or more additives selected from the group consisting of benzofuranone stabilizers of formula I, wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are each independently hydrogen, halogen, hydroxy, C.sub.1-C.sub.25alkyl, C.sub.2-C.sub.25alkenyl, C.sub.2-C.sub.25alkynyl, C.sub.7-C.sub.9phenylalkyl, phenyl, C.sub.5-C.sub.8cycloalkyl, C.sub.1-C.sub.18alkoxy, C1-C8alkylamine, di(C1-C8alkyl)amino, C.sub.1-C.sub.25alkanoyloxy, C.sub.1-C.sub.25alkanoylamino, C.sub.3-C.sub.25alkenoyloxy, C.sub.3-C.sub.25alkanoyloxy interrupted by one to three O, S, NH or N(C.sub.1-C.sub.8alkyl)-, wherein C.sub.1-C.sub.25alkyl, C.sub.2-C.sub.25alkenyl, C.sub.2-C.sub.25alkynyl, C.sub.7-C.sub.9phenylalkyl, phenyl, C.sub.5-C.sub.8cycloalkyl, C.sub.1-C.sub.18alkoxy, C.sub.1-C.sub.8alkylamine, di(C1-C8alkyl)amino, C.sub.1-C.sub.25alkanoyloxy, C.sub.1-C.sub.25alkanoylamino, C.sub.3-C.sub.25alkenoyloxy and interrupted C.sub.3-C.sub.25alkenoyloxy are unsubstituted or substituted by one to three groups selected from halogen, hydroxy, thiol, amino, C.sub.1-C.sub.4alkylamino, di(C.sub.1-C.sub.4alkyl)amino and C.sub.1-C.sub.4alkyl.

##STR00001##

Polyethylene powder comprising at least one additive having: Melt Flow Index (MFI), measured at 190 C. with a load of 2.16 kg in accordance with standard ISO 1133-1:2011, ranging from 0.1 g/10 minutes to 100 g/10 minutes, preferably ranging from 5 g/10 minutes to 35 g/10 minutes; density ranging from 0.890 g/cm.sup.3 to 0.965 g/cm.sup.3, preferably ranging from 0.940 g/cm.sup.3 to 960 g/cm.sup.3; bulk density ranging from 0.35 g/cm.sup.3 to 0.60 g/cm.sup.3, preferably ranging from 0.40 g/cm.sup.3 to 0.50 g/cm.sup.3; average particle diameter (d.sub.50) ranging from 400 m to 800 m, preferably ranging from 450 m to 780 m. Said polyethylene powder comprising at least one additive can be advantageously used in rotomolding.

Polyethylene powder comprising at least one additive having: Melt Flow Index (MFI), measured at 190 C. with a load of 2.16 kg in accordance with standard ISO 1133-1:2011, ranging from 0.1 g/10 minutes to 100 g/10 minutes, preferably ranging from 5 g/10 minutes to 35 g/10 minutes; density ranging from 0.890 g/cm.sup.3 to 0.965 g/cm.sup.3, preferably ranging from 0.940 g/cm.sup.3 to 960 g/cm.sup.3; bulk density ranging from 0.35 g/cm.sup.3 to 0.60 g/cm.sup.3, preferably ranging from 0.40 g/cm.sup.3 to 0.50 g/cm.sup.3; average particle diameter (d.sub.50) ranging from 400 m to 800 m, preferably ranging from 450 m to 780 m. Said polyethylene powder comprising at least one additive can be advantageously used in rotomolding.

Polyethylene powder comprising at least one additive having: Melt Flow Index (MFI), measured at 190 C. with a load of 2.16 kg in accordance with standard ISO 1133-1:2011, ranging from 0.1 g/10 minutes to 100 g/10 minutes, preferably ranging from 5 g/10 minutes to 35 g/10 minutes; density ranging from 0.890 g/cm.sup.3 to 0.965 g/cm.sup.3, preferably ranging from 0.940 g/cm.sup.3 to 960 g/cm.sup.3; bulk density ranging from 0.35 g/cm.sup.3 to 0.60 g/cm.sup.3, preferably ranging from 0.40 g/cm.sup.3 to 0.50 g/cm.sup.3; average particle diameter (d.sub.50) ranging from 400 m to 800 m, preferably ranging from 450 m to 780 m. Said polyethylene powder comprising at least one additive can be advantageously used in rotomolding.

Provided is an ECTFE resin composition that is superior in transparency and resistant to yellowing for an extended period of time. The ECTFE resin composition generates a smaller amount of acidic gases, for example, when it is extrusion molded at high temperature. It is an ethylene-chlorotrifluoroethylene copolymer resin composition including a bisphenol-based antioxidant. It is preferably an ethylene-chlorotrifluoroethylene copolymer resin composition additionally including a phosphorus-based antioxidant.

Provided is an ECTFE resin composition that is superior in transparency and resistant to yellowing for an extended period of time. The ECTFE resin composition generates a smaller amount of acidic gases, for example, when it is extrusion molded at high temperature. It is an ethylene-chlorotrifluoroethylene copolymer resin composition including a bisphenol-based antioxidant. It is preferably an ethylene-chlorotrifluoroethylene copolymer resin composition additionally including a phosphorus-based antioxidant.