Method for rotolining metallic hollow articles with metallocene-produced polyethylene.

The invention relates to a process for the preparation of polypropylene having: a molecular weight of 450,000-950,000, a molecular weight distribution of 3-6, and xylene soluble content of 2-6 wt %, by converting propylene into the polypropylene without pre-polymerization in the presence of a polymerization catalyst under a condition where the volume ratio of H.sub.2 to propylene is at most 0.0020, wherein the catalyst comprises a catalyst component and a co-catalyst, wherein the catalyst component is obtained by a process wherein a compound with formula Mg(OAlk).sub.xCl.sub.y wherein x is larger than 0 and smaller than 2, y equals 2−x and each Alk, independently, represents an alkyl group, is contacted with a titanium tetraalkoxide and/or an alcohol in the presence of an inert dispersant to give an intermediate reaction product and wherein the intermediate reaction product is contacted with titanium tetrachloride in the presence of an internal donor.

The present invention relates to diene polymers or diene copolymers, wherein the diene polymers or diene copolymers have, at the start of the polymer chains, tertiary amino groups of the formula (Ia), (Ib), (IIa) or (IIb) ##STR00001##
where R.sup.1, R.sup.2 are the same or different and are each alkyl, cycloalkyl, aryl, alkaryl and aralkyl radicals which may contain heteroatoms such as O, N, S and/or Si, Z is a divalent organic radical which, as well as C and H, may contain heteroatoms such as O, N, S and/or Si, and, at the end of the polymer chains, silane-containing carbinol groups of the formula (III) ##STR00002## or metal salts thereof or semimetal salts thereof, where R.sup.3, R.sup.4, R.sup.5, R.sup.6 are the same or different and are each an H or alkyl, cycloalkyl, aryl, alkaryl and aralkyl radicals which may contain heteroatoms such as O, N, S and/or Si, A is a divalent organic radical which, as well as C and H, may contain heteroatoms such as O, N, S and/or Si.

Microscale and nanoscale tubular structures are provided including rheological fluids in their interior volume and including at least one electroactive component. Multiple tubular structures are provided, including simple hollow tube structures; core/shell structures, wherein the tube includes a tubular outer shell with a core extending axially therein; concentric tube or coaxial tube structures, wherein the tube includes a tubular outer shell and one or more concentric tubes extending axially therein; and core/concentric tube structures, wherein concentric tubes further include a core extending axially therein, thus having a core and two or more tubes surrounding the core. The tubular structures are formed by electrospinning and special spinnerets are provided. The tubular structures form fabrics for beneficial uses.

Disclosed are nitrile rubber and a method of preparing the same. The nitrile rubber contributing to an excellent polymerization rate and vulcanization rate and having advantageous processability during vulcanization, and a method of preparing the same are disclosed.

The present disclosure relates to a shape memory polymer material containing at least one two dimensional region having a first amount of stored stress in a first direction and a second amount of stored stress higher than the first amount of stored stress in a second direction, wherein the two dimensional region is capable of changing shape in only one of the first or second directions.

Components for heavy duty trucks are described that exhibit high strength and flexibility. The components are formed from a polyarylene sulfide that exhibits high strength and flexibility characteristics. Methods for forming the components are also described. Formation methods include dynamic vulcanization of a polyarylene sulfide composition that includes an impact modifier dispersed throughout the polyarylene sulfide. A crosslinking agent is combined with the other components of the composition following dispersal of the impact modifier throughout the composition. The heavy duty truck components can include tubular member such as pipes and hoses that can be utilized in exhaust systems, charge air systems, urea tanks, fuel systems, and so forth.

A method for manufacturing tubular bodies (1) exhibiting an inner circumferential surface (8) and outer circumferential surface (7) for packaging tubes out of a strip-shaped film substrate (2), which exhibits at least one weldable plastic layer (3) or consists of the latter, and which encompasses a first edge face (5) extending in the longitudinal direction of the film substrate (2) or a second edge face (6) spaced apart from the first edge face (5) by the width of the film substrate (2), wherein the first edge face (5) runs at a first angle (α) relative to a first thickness extension direction on a first radially innermost border (9) of the first edge face (5), and the second edge face (6) runs at a second angle (β) relative to a second thickness extension direction on a second radially outermost border of the second edge face (6), and wherein the first and second edge faces (6) are placed opposite each other and joined together during exposure to heat, wherein the first angle (α) and second angle (β) differ in size, in that the selected first angle (α) is smaller than the second angle (β) by an angular difference of between 3° and 70°, and that the edge faces (5, 6) are situated in such a way that an outwardly open longitudinal gap (11) is delimited by the first and second edge faces (5, 6).

An insulated sleeve is provided to be coupled to an outer surface of a cup. The sleeve is formed from an insulative cellular non-aromatic polymeric material having an area of plastic deformation. There are no fractures in the insulative cellular non-aromatic polymeric material so that a predetermined insulative characteristic is maintained in the material.

Methods for preparing oriented polymer tubes, such as biodegradable polymer tubes suitable for in vivo use, are provided herein. The disclosed methods provide alternatives to the typical extrusion/expansion methods by which oriented polymeric tubes for such uses are commonly produced. Advantageously, the disclosed methods can provide more homogeneous molecular orientation of crystallizable polymers within the tube walls, which can endow such polymeric tubes with enhanced strength (e.g., resistance to compression) and toughness.