48results about How to "High melt tension" patented technology

The present invention provides a fluoropolymer that is melt-processible and thermoplastic and that has a melting point between 100° C. and 320° C. The fluoropolymer is derived from (a) one or more gaseous fluorinated monomers, (b) one or more modifiers selected from (i) olefins having a bromine or iodine atom bonded to a carbon of the double bond of the olefin, (ii) olefins corresponding to formula (I): X2C=CX-Rf-Br (I) wherein each Xindependently represents hydrogen, fluorine, bromine, chlorine or iodine, Rf is a perfluoroalkylene group, typically having 1 to 8 carbon atoms, a perfluorooxyalkylene group or a perfluoropolyether group and (iii) mixtures thereof; and (c) optionally one or more comonomers selected from non-gaseous fluorinated monomers and non-fluorinated monomers. The resulting fluoropolymer has long chain branches. The invention further provides a method for making these polymers.

A water-soluble polyvinyl alcohol resin filament is provided, which is formed by melt-spinning a material consisting essentially of a water-soluble polyvinyl alcohol resin having a 1,2-diol structural unit represented by the following general formula (1). A nonwoven fabric is also provided, which is produced by using the water-soluble polyvinyl alcohol resin filament. Therefore, the nonwoven fabric is excellent in water solubility at a lower temperature, and substantially free from bubbling during dissolution thereof in water. In addition, a fully saponified PVA can be used for melt-forming. This suppresses emanation of acetic acid odor, thereby improving the working environment.

wherein R¹, R², R³, R⁴, R⁵ and R⁶, which may be the same or different, are each a hydrogen atom or a monovalent organic group, and X is a single bond or a connecting chain.

There are provided:

(I) a catalyst component for addition polymerization comprising:

(i) a transition metal compound having (a) two cyclopentadiene type anion skeleton-carrying groups, which are linked with each other directly or through a bridging group, and (b) a hafnium atom as its central metal, and

(ii) a transition metal compound having (a) two substituted cyclopentadiene type anion skeleton-carrying groups, which are not linked with each other, and (b) a zirconium atom or a titanium atom as its central atom; and

(II) a process for producing a catalyst for addition polymerization, which comprises the step of contacting the above catalyst component with a co-catalyst component for activation.

To provide: a semiaromatic polyamide which has excellent moldability, heat resistance, chemical resistance and mechanical characteristics; and a molded article of this semiaromatic polyamide. A semiaromatic polyamide (I) of the present invention contains 35-50% by mole of a structural unit derived from terephthalic acid [A], 25-40% by mole of a structural unit derived from isophthalic acid [B], 15-35% by mole of a structural unit derived from an aliphatic dicarboxylic acid [C] (provided that the total of [A], [B] and [C] is 100% by mole), and a structural unit derived from an aliphatic diamine [D] having 4-12 carbon atoms. The molar ratio ([A]/[B]) is from 65/35 to 50/50, and the molar ratio ([C]/[B]) is from 30/70 to 50/50. The melting enthalpy ([increment]H) of the semiaromatic polyamide (I) as determined by differential scanning calorimetry (DSC) is 20-40 mJ/mg, and the intrinsic viscosity of the semiaromatic polyamide (I) is 0.7-1.6 dl/g.

To provide an ETFE-type copolymer having a high melt tension and excellent blow moldability.

An ethylene-tetrafluoroethylene copolymer which comprises ethylene units, tetrafluoroethylene units and units of a monomer (A) having at least two copolymerizable double bonds and which has a ratio (X/W) of its melt tension (XmN) to a load (Wkg) applied for the measurement of the melt tension being at least 0.8.

PCT No. PCT/JP98/00534 Sec. 371 Date Sep. 22, 1998 Sec. 102(e) Date Sep. 22, 1998 PCT Filed Feb. 9, 1998 PCT Pub. No. WO98/35997 PCT Pub. Date Aug. 20, 1998An olefin (co)polymer composition comprising, as major components, (a) 0.01 to 5 parts by weight of an olefin (co)polymer having an intrinsic viscosity [ eta a] as measured in 135 DEG C. tetralin of 15 to 100 dl/g and (b) 100 parts by weight of an olefin (co)polymer obtained by using a metallocene catalyst and having an intrinsic viscosity [ eta b] as measured in 135 DEG C. tetralin of 0.2 to 10 dl/g. When polyethylene having a high degree of polymerization is produced before a so-called metallocene catalyst is used to polymerize, e.g., propylene in the presence of the polyethylene as a component of a catalyst composition, a polypropylene composition having a high melt tension and a high crystallization temperature is produced.

[Problem] To provide an ethylene-α-olefin copolymer having high mechanical strength and good molding properties.

[Solution] Provided is an ethylene-α-olefin copolymer having a specific MFR, a specific density, and a specific molecular weight distribution, containing a suitable amount of a long-chain branching structure characterized by a branching index, and having a specific composition distribution structure characterized by solvent fractionation behavior.

The invention discloses a composition used for preparing an EVA copolymer cross-linked in trace amount, the EVA copolymer and a preparation method of the EVA copolymer. The composition comprises gel or fisheye which is provided with high fusion tension and lowest probability. The composition comprises 50-500 pm one kind or various kinds of organic peroxides which are selected from dialkyl peroxides crosslinking agent, alkyl group peroxy esters crosslinking agent and peroxy ketals crosslinking agent and have one-minute half-life period temperature of 130 DEG to 190 DEG C. the composition also comprises 50-250 ppm common crosslinking agent, 100-1500 pm diluents and 50-600 ppm antioxidant and ethylene-vinyl acetate (EVA) with melt index (MI) of 8-25g/10min and with 26%-28wt% of vinyl acetate (VA).

A graft modified ethylene/alpha-olefin copolymer obtained by graft polymerizing an ethylene/alpha-olefin of 3 to 20 carbon atoms copolymerizing with a polar monomer in the presence of a catalyst for olefin polymerization comprising an organoaluminum oxy-compound (a) and at least two kinds of transition metal compounds (b). This ethylene/alpha-olefin copolymer has high melt tension and high flowability. An ethylene copolymer composition comprising the above-mentioned graft modified ethylene/alpha-olefin copolymer and polyolefin. The graft modified ethylene/alpha-olefin copolymer of the invention is excellent in heat stability and moldability. From this copolymer, a film having a high transparency and good adhesion to highly polar materials can be produced. The ethylene copolymer composition of the invention is excellent in heat stability and moldability. From this composition, a film having high transparency and good adhesion to highly polar materials can be produced.

A polycarbonate resin wherein a relation between the melt tension [MT (g)] at 280°C and melt volume rate [MVR (cm3/10 min)] at 280°C satisfies the requirements represented by formulae (1) to (3), and a polycarbonate resin composition and a molded article containing the same. Formula (1): MT≥(15.4/MVR)-1.3 Formula (2): MT≤(57.4/MVR)-1.3 Formula (3): MT≥1

A styrene resin composition is provided which has a high molecular weight enabling a molded product obtained therefrom to have satisfactory strength, has a high melt mass-flow rate, high melt tension, and hence excellent moldability, and is less apt to gel during production, and a process for producing such a styrene resin composition. The styrene resin composition comprises a linear polystyrene having a weight average molecular weight of 200,000 to 350,000 and a multibranched polystyrene having a weight average molecular weight of 1,000,000 to 10,000,000, has an average molecular weight of 250,000 to 700,000, and a melt mass-flow rate (MFR) and melt tension (MT) which satisfy the following formulas (1) and (2) respectively:

MFR≧45×exp(−0.1×Mw×10⁻⁴)  (1)

MT≧0.07Mw×10⁻⁴+1.8  (2).

The invention discloses a persistent hydrophilic polypropylene separation net material and a preparation method thereof. A magnesium sulfate whisker stiffening modification technology and a hydrophilic substance slow-release traction technology are combined, and a hydrophilic agent is pulled to the surface of a material by utilizing the self-polymerization capability of dopamine to form a uniform hydrophilic layer; and a hydrophilic substance is locked by utilizing the slow-release and confining effects of a slow-release agent such as EAA sodium salt, so that the separation net material not only has good appearance, stiffness, solvent resistance and mechanical comprehensive performance, but also has permanent hydrophilic performance and lasting anti-pollution performance. The method is simple, the performance is excellent, the effect is obvious, the good industrial application prospect is achieved, the prepared partition net material has the advantages of being good in supporting and flow dividing effect, resistant to corrosion, efficient, lasting in anti-pollution performance and easy to clean, the problem of attachment of fine particles can be greatly solved, the use efficiency of fluid handling components is greatly improved, and the life of the fluid handling components is prolonged; and the fluid treatment components is suitable for the fluid treatment components which are in close contact with hydrophilic fluid and need isolation supporting and flow dividing effects.

Disclosed is a thermoplastic resin composition containing a thermoplastic resin (A) having a functional group reactive with epoxy groups, a polymer (B) having an epoxy group and a catalyst (C) for accelerating reactions of the functional group reactive with epoxy groups and the epoxy group. The content of the polymer (B) is set at 0.1-5 parts by mass per 100 parts by mass of the thermoplastic resin (A), while the content of the catalyst (C) is set at from 1.0 10<-6> to 50 10<-6> parts by mass per 100 parts by mass of the thermoplastic resin (A). Also disclosed is a molded article obtained by molding, for example extrusion molding the thermoplastic resin composition.