Copolymers, as well as compounds, compositions, articles of manufacture, and methods of making thereof, are disclosed. The copolymers may generally exhibit flexibility properties and may generally have a high refractive index. The copolymers may generally be made by providing a dihydrodisiloxane and an aliphatic vinyl alcohol and combining the dihydrodisiloxane and the aliphatic vinyl alcohol under conditions that allow for hydrogenation of the aliphatic vinyl alcohol and result in coupling of the aliphatic vinyl alcohol to the dihydrodisiloxane to produce a hydroxyl substituted siloxane.
The present invention is directed to a polyacetal stretched fiber of a polyacetal resin composition which contains a polyacetal resin and a fatty acid metal salt in an amount of 0.01 to 5 phr relative to the polyacetal resin, wherein the stretched fiber is obtained by stretching a fiber at a temperature of 100°C or more to a temperature lower than the melting point of a polyacetal resin composition, and the fiber is obtained by melt spinning the polyacetal resin composition, and a fiber assembly comprising the stretched fiber as a main constituent.
The present invention provides a method for producing a polyacetal fiber that presents an improved whiteness unevenness. According to one embodiment, there is provided a polyacetal fiber production method that yields a polyacetal fiber using an oxymethylene copolymer having a melt index, at 190°C under a load of 2.16 kg, of 5-60 g/10 min, wherein the production method includes a take-off step for taking off the polyacetal fiber from the discharge nozzle of a spinning apparatus, and a drawing step for drawing the taken-off polyacetal fiber. The tensile elongation E1 of the polyacetal fiber after the take-off step is 20%-500%; the tensile elongation E2 of the polyacetal fiber after the drawing step is 10%-100%; E1≥E2; and the single fiber thickness of the polyacetal fiber after the drawing step is 0.7-5.0 denier.
The present invention is directed to a polyacetal stretched fiber of a polyacetal resin composition which contains a polyacetal resin and a fatty acid metal salt in an amount of 0.01 to 5 phr relative to the polyacetal resin, wherein the stretched fiber is obtained by stretching a fiber at a temperature of 100° C. or more to a temperature lower than the melting point of a polyacetal resin composition, and the fiber is obtained by melt spinning the polyacetal resin composition, and a fiber assembly comprising the stretched fiber as a main constituent.