The present invention relates to a sealing element and/or a support ring, in particular for a reciprocating compressor, manufactured by compression molding of a mixture of chips of carbon fiber-reinforced composite material, wherein at least part of the chips contains carbon fibers having a length of 3 to 20 mm, and wherein the carbon fibers in the sealing element and/or support ring have a random fiber orientation.

The following is provided as a member for a composite material that has excellent stiffness, heat resistance, and productivity. A member for a composite material containing resin component that contains polyaryletherketone as a main component. The resin component has a molecular weight distribution of 3.8 or more and 8 or less and a mass average molecular weight of 86000 or less. The member for a composite material has a thickness more than 15 μm. The composite material contains a resin and reinforcing fibers having a number average fiber length of 5 mm or more.

The following is provided as a member for a composite material that has excellent stiffness, durability, impact resistance, and productivity. A member for a composite material containing a resin component that contains polyaryletherketone as a main component. The resin component has a molecular weight distribution of 4 or more and 8 or less and a mass average molecular weight of 88000 or more. The composite material contains a resin and reinforcing fibers having a number average fiber length of 5 mm or more.

The present invention generally relates a composite material containing fibers and a resin matrix that comprises a PEEK-PEoEK copolymer having R.sub.PEEK and R.sub.PEoEK repeat units in a molar ratio R.sub.PEEK/R.sub.PEoEK ranging from 95/5 to 5/95 in contact with at least a part of the surface of such fibers. The present invention also relates to methods for making such composite materials, shaped articles made from such composite materials, and methods of making such articles.

A reinforcement sheet has a composite layer including fibres and a polymer A and a coating layer including polymer B, each polymer having at least 65 mol % of a repeat unit of formula:

##STR00001##

wherein for each polymer A and B, t1, and w1 independently represent 0 or 1 and v1 represents 0, 1 or 2. A method of forming the reinforcement sheet is also disclosed, in addition to a method for forming an article comprising a laminate of the reinforcement sheets and the article comprising such a laminate. The repeat unit may be ether-ether-ketone.

A resin powder for solid freeform fabrication has a 50 percent cumulative volume particle diameter of from 5 to 100 μm and a ratio (Mv/Mn) of a volume average particle diameter (Mv) to the number average particle diameter (Mn) of 2.50 or less and satisfies at least one of the following conditions (1) to (3): (1): Tmf1>Tmf2 and (Tmf1−Tmf2)≥3 degrees C., both Tmf1 and Tmf2 are measured in differential scanning calorimetry measuring according to ISO 3146, (2): Cd1>Cd2 and (Cd1−Cd2)≥3 percent, both Cd1 and Cd2 are measured in differential scanning calorimetry measuring according to ISO 3146, and (3): C×1>C×2 and (C×1−C×2)≥3 percent.

A resin powder for solid freeform fabrication has a 50 percent cumulative volume particle diameter of from 5 to 100 μm and a ratio (Mv/Mn) of a volume average particle diameter (Mv) to the number average particle diameter (Mn) of 2.50 or less and satisfies at least one of the following conditions (1) to (3): (1): Tmf1>Tmf2 and (Tmf1−Tmf2)≥3 degrees C., both Tmf1 and Tmf2 are measured in differential scanning calorimetry measuring according to ISO 3146, (2): Cd1>Cd2 and (Cd1−Cd2)≥3 percent, both Cd1 and Cd2 are measured in differential scanning calorimetry measuring according to ISO 3146, and (3): Cx1>Cx2 and (Cx1−Cx2)≥3 percent.

[Object] To provide a technology capable of further improvement of the performance of a PEEK molded body.

[Solving Means] A PEEK molded body includes: a body portion having a first exothermic peak, and a second exothermic peak positioned at a higher temperature than the first exothermic peak, as two exothermic peaks indicating crystallization of PEEK in a DSC curve. The surface layer portion covers the body portion, and has a third exothermic peak, positioned at a higher temperature than the first exothermic peak, as an only exothermic peak indicating crystallization of PEEK in a DSC curve.

[Selected Drawing] None

An aromatic polyether containing a structural unit represented by the following formula (1), a structural unit represented by the following formula (2), and a structure represented by the following formula (3), wherein .sup.1H-NMR measurement, a ratio of a peak intensity of a peak having the largest peak intensity among peaks derived from the structure represented by the formula (3) appearing in the range of chemical shift 7.55 ppm to 7.65 ppm, relative to a peak intensity of a peak derived from the structural unit represented by the formula (2) appearing in the vicinity of chemical shift 7.35 ppm is 0.20 to 2.00%.

##STR00001##

A method of activating a surface of a plastics substrate formed from: (a) polyaryletherketone such as polyether ether ketone (PEEK) polyether ketone ketone (PEKK), polyether ketone (PEK); polyether ether ketone ketone (PEEKK); or polyether ketone ether ketone ketone (PEKEKK); (b) a polymer containing a phenyl group directly attached to a carbonyl group, for example polybutadiene terephthalate (PBT) optionally wherein the carbonyl group is part of an amide group, such as polyarylamide (PARA); (c) polyphenylene sulfide (PPS); or (d) polyetherimide (PEI); for subsequent bonding,
the method comprising the step of exposing the surface to actinic radiation wherein the actinic radiation: includes radiation with wavelength in the range from about 10 nm to about 1000 nm; the energy of the actinic radiation to which the surface is exposed is in the range from about 0.5 J/cm.sup.2 to about 300 J/cm.sup.2.

Hard to bond substrates are then more easily subsequently bonded for example using acrylic, epoxy or anaerobic adhesive.