Asahi Kasei Kabushiki Kaisha

Koichi Tsujimoto

Provided is an ultrahigh-molecular-weight polyethylene powder having a viscosity-average molecular weight (Mv) of 10×10or higher and 1000×10or lower, having a difference of 3° C. or more between a swelling onset temperature and a dissolution onset temperature determined by a specific method, and having a rate of impregnation with liquid paraffin (rate of increase in weight) of 0.5% or more and 5.0% or less determined by a specific method.

Ultrahigh-molecular-weight polyethylene powder and molded article prepared by molding the same

The ultrahigh-molecular-weight polyethylene powder of the present invention is an ultrahigh-molecular-weight polyethylene powder having a viscosity-average molecular weight Mv of 10&#xd7;10or higher and 1000&#xd7;10or lower, wherein viscosity-average molecular weight Mv(A) of a kneaded product obtained by kneading under specific kneading conditions, and the Mv satisfy the following relationship: '{Mv&#x2212;Mv(A)}/Mv is 0.20 or less', and the ultrahigh-molecular-weight polyethylene powder contains an ultrahigh-molecular-weight polyethylene powder having a particle size of 212 &#x3bc;m or larger, wherein the powder having a particle size of 212 &#x3bc;m or larger has an average pore volume of 0.6 ml/g or larger and an average pore size of 0.3 &#x3bc;m or larger.

Ultrahigh-molecular-weight polyethylene powder

The present invention provides an ultra-high molecular weight polyethylene powder having a viscosity-average molecular weight of 10&#xd7;10or higher and 1000&#xd7;10or lower, wherein a temperature range in which a torque value reaches &#xbd; of the maximum torque value is 150&#xb0; C. or higher and 170&#xb0; C. or lower in torque value measurement.

Ultra-high molecular weight polyethylene powder and ultra-high molecular weight polyethylene fiber

The present invention provides an ultra-high molecular weight polyethylene powder having a viscosity-average molecular weight of 10&#xd7;10or higher and 1000&#xd7;10or lower, wherein a difference between a temperature at which a torque value reaches 80% of the maximum torque value and a temperature at which the torque value reaches 20% of the maximum torque value is 0.1&#xb0; C. or more and 50&#xb0; C. or less in torque value measurement.

The present invention provides an ultra-high molecular weight polyethylene fiber having a viscosity-average molecular weight of 10&#xd7;10to 1000&#xd7;10, wherein the ultra-high molecular weight polyethylene fiber has at least three melting peaks in a heating differential scanning calorimetry curve (DSC curve), and in the melting peaks, the difference between (I) a peak temperature of a melting peak appearing between 140&#xb0; C. or higher and lower than 150&#xb0; C. and (II) a peak temperature of a melting peak appearing between 150&#xb0; C. or higher and lower than 158&#xb0; C. is 10&#xb0; C. or less.

Growing community of inventors

Tokyo, Japan

Koichi Tsujimoto