Provided is a wholly aromatic liquid crystalline polyester resin having excellent heat resistance and formability. The wholly aromatic liquid crystalline polyester resin comprises structural units represented by the following formulae (I) to (V) as essential structural units, ##STR00001##
wherein the composition ratio (mol %) of the structural units (I) to (V) in the wholly aromatic liquid crystalline polyester satisfies the following conditions: 50 mol %≤structural unit (I)≤75 mol %; 6 mol %≤structural unit (II)≤20 mol %; 1 mol %≤structural unit (III)≤21.5 mol %; 0.5 mol %≤structural unit (IV)≤10.5 mol %; 2.5 mol %≤structural unit (V)≤22 mol %; structural unit (III)>structural unit (IV).

This liquid crystal polyester resin composition includes a liquid crystal polyester resin and a filler composed of a fibrous filler and a plate-like filler, in which the amount of the filler is at least 15 parts by mass but not more than 55 parts by mass per 100 parts by mass of the liquid crystal polyester resin, and the number average fiber length of the fibrous filler is at least 450 μm but not more than 700 μm.

A polymer composition that contains an aromatic polymer in combination with a tribological formulation is provided. The polymer composition may exhibit a low degree of surface friction that minimizes the extent to which a skin layer is peeled off during use of a part containing the composition (e.g., in a camera module). For example, the polymer composition may exhibit a dynamic coefficient of friction of about 1.0 or less and/or a wear depth may be about 500 micrometers or less as determined in accordance with VDA 230-206:2007.

A high-modulus black matte polyimide film is provided, the high-modulus black matte polyimide film includes polyimide in an amount from 75 to 93 wt % of the high-modulus matte polyimide film, in which dianhydride and diamine are polymerized to form a polyimide precursor, and the polyimide precursor is chemically cyclized to form the polyimide; carbon black in an amount from 2 to 8 wt % of the high-modulus matte polyimide film; and liquid crystal polymer micropowder having a particle size between 2 and 10 m and being in an amount from 5 to 20 wt % of the high-modulus matte polyimide film, wherein the high-modulus matte polyimide film has a gloss value at 60 being less than 50.

A foamable composition including a polypropylene-based copolymer and a polyolefin is disclosed. The composition can be used to make a stiff foam with a high closed-cell content. Methods for producing the composition and the foam are provided.

Provided is a relay box housing obtained by molding a resin composition containing (a) a polypropylene resin, (b) a polyphenylene ether resin, and (c) a hydrogenated block copolymer. The resin composition has a deflection temperature under load of 100 C. or higher and a ratio of the storage elastic modulus G.sub.A to G.sub.B, expressed as G.sub.A/G.sub.B, of 0.9 to 1.5. Multipurpose test specimens A and B are obtained from the resin composition with an injection molding method with a first multipurpose test specimen A immersed in water under predetermined conditions and a second multipurpose test specimen B not immersed. Storage elastic modulus measurement is performed on each of the test specimens A and B at 50 C. in a tensile mode to obtain the storage elastic moduli G.sub.A and G.sub.B.

A liquid crystal polyester resin composition containing 100 parts by mass of a liquid crystal polyester resin; and at least 10 parts by mass and at most 100 parts by mass of glass components; wherein the glass components contain glass fibers having a length of more than 30 m and glass fine powders having a length of at least 4 m and at most 30 m; the number-average fiber length of the glass fibers is at least 50 m and at most 200 m; and the content of the fine powders is at least 50% and at most 95% relative to a total number of the glass components.

A polymer composite includes a linear aliphatic semi-crystalline polyamide having on average 10 to 14 carbon atoms in the monomer units, or the compound thereof, an S glass fiber, and a core-shell impact modifier. The polymer composite can achieve higher stiffness and impact strength without impairing the transparency significantly. The polymer composite can be used as molding material.

Processing aid for aiding in orienting an extruded film layer including a preponderance, by weight, of a high crystalline polypropylene is a crystalline polypropylene wax.

An oriented film layer including a blend of crystalline polypropylene wax and high crystallinity polypropylene homopolymer is part of the invention.

The invention includes a method of forming an oriented film layer including a preponderance by weight of a high crystallinity polypropylene and includes the steps of blending a high crystallinity polypropylene with a crystalline polypropylene wax, directing the blend through an extruder to form a film layer and then orienting the film layer.

The invention includes a biaxially oriented, multi-layer film including a base layer and at least one skin layer. The base layer includes a blend of crystalline metallocene catalyzed polypropylene wax and a high crystallinity polypropylene.

A polymer composition that contains an aromatic polymer in combination with a tribological formulation is provided. The polymer composition may exhibit a low degree of surface friction that minimizes the extent to which a skin layer is peeled off during use of a part containing the composition (e.g., in a camera module). For example, the polymer composition may exhibit a dynamic coefficient of friction of about 1.0 or less and/or a wear depth may be about 500 micrometers or less as determined in accordance with VDA 230-206:2007.