90results about How to "Improved melt processability" patented technology

A thermoplastic olefin (TPO) composition comprises (1) a major amount by weight of (a) a substantially linear homopolymer or copolymer of a C₂-C₁₀ α-olefin in major proportion to (b) a long chain branched a linear homopolymer or copolymer of a C₂-C₁₀ α-olefin, (2) a minor amount by weight of a cross linkable elastomer, and (3) at least one thermally decomposing free radical generating agent present in an amount sufficient to promote an increase in melt strength of the composition over that of the melt strength of the linear homopolymer or copolymer of a C₂-C₁₀ α-olefin alone and insufficient to substantially degrade the α-olefinic polymers. The TPO composition is prepared by melt blending the components at a temperature sufficient to melt said homopolymers or copolymers of a C₂-C₁₀ α-olefin and thermally decompose said agent. Articles are thermoformed from the thermoplastic olefin.

A biodegradable polymer includes a) 20 to 60% of a mixture of starch and/or a modified starch, b) 8 to 22% of starch plasticisers and processing agents c) 30 to 70% of one or more biodegradable aliphatic polyesters d) 1 to 10% of a layered silicate clay mineral. The silicate mineral is an organoclay which has been formed by reacting clay with an intercalating chemical to compatibilise it with the polymers so that the clay is exfoliated and makes the blend amorphous. The polymers may also include the usual additives including e) from 0 to 20% by weight of a polyol plasticiser f) from 0.1 to 1.5% by weight of a C12-22 fatty acid or salt or a destructing agent preferably urea and/or urea derivatives, and g) from 0 to 12% by weight of added water. The polyester may be modified by reaction with maleic anhydride.

Compositions made from a polyarylate or polyester carbonate containing greater than about 50 mole % resorcinol based ester linkages give miscible blends with polyimide resins, addition of alkyl amide compounds improves mold release and melt flow while maintaining transparency. The blends also have high refractive index and low haze.

The present invention relates to a crosslinked lignin comprising a lignin structure having methylene or ethylene linking groups therein crosslinking between phenyl ring carbon atoms, wherein said crosslinked lignin is crosslinked to an extent that it has a number-average molecular weight of at least 10,000 g/mol, is melt-processible, and has either a glass transition temperature of at least 100° C., or is substantially soluble in a polar organic solvent or aqueous alkaline solution. Thermoplastic copolymers containing the crosslinked lignin are also described. Methods for producing the crosslinked lignin and thermoplastic copolymers are also described.

The invention belongs to the field of material engineering and discloses a liquid crystal polyester and its preparation method and use. The liquid crystal polyester is obtained by a condensation polymerization reaction of p-hydroxybenzoic acid, biphenol, diphenol with a fluorene skeleton and aromatic dicarboxylic acid. A unit with a fluorene skeleton side group is introduced into a chain structure of the liquid crystal polyester so that the liquid crystal polyester has a melting temperature of 310 to 360 DEG C, good fluidity and excellent melting processing performances.

The invention discloses a thermoplastic cellulose-based solid-solid phase transition material and a preparation method thereof. The preparation method comprises the following steps: 1, drying cellulose or a cellulose derivative; 2, respectively dissolving a cross-linking agent and polyethylene glycol alkyl ether in an organic solvent I to obtain a cross-linking agent solution and a polyethylene glycol alkyl ether solution, adding the polyethylene glycol alkyl ether to the cross-linking agent solution in a dropwise manner, adding a catalyst, and reacting for 0.5-10h to obtain a prepolymer solution, wherein a mole ratio of the polyethylene glycol alkyl ether to the cross-linking agent is 1:1; and 3, dissolving cellulose in an ionic liquid to obtain a cellulose solution, adding the prepolymer solution, acid anhydride and a catalyst to the above obtained cellulose solution, carrying out a polymerization reaction for 2-24h to obtain a finally obtained mixture, adding the finally obtained mixture to deionized water or an organic solvent II for precipitation, repeatedly washing the above obtained precipitate with deionized water 2-3 times, and carrying out vacuum drying to obtain the thermoplastic cellulose-based solid-solid phase transition material. The phase transition material has a good thermal stability and a melting processing performance, and can be blended with a thermoplastic copolymer matrix for melting processing.

A thermoplastic resin composition is provided having excellent flowability, high crystallization characteristics, high transparency and excellent processability in melt processing to resin molded products, sheets, films, fibers and pipes. The thermoplastic resin composition includes 100 parts by weight of (A) a thermoplastic resin; and 0.5 to 50 parts by weight of (B) a cyclic poly(phenylene ether ketone) that is expressed by General Formula (I) given below and has phenylene ketone shown by -Ph-CO— and phenylene ether shown by -Ph-O— as are repeating structural unit:

wherein Ph in Formula represents a para-phenylene structure; o and p are respectively integral numbers of not less than 1; and m is an integral number of 2 to 40.

The invention relates to a composition containing an ethylene-vinyl alcohol copolymer, and a preparation method thereof. The composition comprises 90-95wt% of the ethylene-vinyl alcohol copolymer and 5-10wt% of an ethylene-vinyl alcohol micro-molecular oligopolymer, and the molecular structure of the ethylene-vinyl alcohol copolymer contains 1-2%mol of a 1,2-glycol structure. The preparation method of the composition comprises the following steps: polymerizing 50-80 parts of a vinyl acetate monomer, 20-50 parts of an alcoholic solvent and 0.0001-0.001 parts of an initiator at 80-140DEG C under 30-70kg/cm<2>, and carrying out a saponification reaction to obtain the composition. The molecular structure of the composition contains 1-2%mol of the 1,2-glycol structure having a viscosity reducing effect, and also contains 5-10mol% of the micro-molecular oligopolymer having a plasticising effect, so it is in favor of the melting processing property of the ethylene-vinyl alcohol copolymer, and the problems of the bad repeated utilization of the routine ethylene-vinyl alcohol copolymer, the easy migration of inorganic salt additives to the surface of the polymer, and environment pollution are overcome. The preparation method has the advantages of simple process, safety, environmental protection, high product quality, and suitableness for industrial production.

It is an object of the present invention to provide an optical film which has reverse chromatic dispersibility that its retardation becomes smaller as the wavelength becomes shorter and a low photoelastic constant.

The optical film is made of a polycarbonate copolymer containing a unit (A) represented by the following formula:

and a unit (B) represented by the following formula:

the (A/B) molar ratio of the unit (A) to the unit (B) is 10/90 to 90/10 and which satisfies the following expression (1):

R(450)<R(550)<R(650)  (1)

• • wherein R(450), R(550) and R(650) are retardation values within the plane of the film at wavelengths of 450 nm, 550 nm and 650 nm, respectively.

The invention discloses a wholly aromatic liquid crystal polymer and a preparation method thereof. The wholly aromatic liquid crystal polymer is obtained by the condensation polymerization reaction offour monomers: para-hydroxybenzoic acid, triptycene quinhydrone, terephthalic acid and m-phthalic acid. By introducing a triptycene unit with a space steric effect, the melting temperature of homopolymerizing para-hydroxybenzoic acid is reduced, a nematic liquid crystal polymer with excellent melting processing performance is obtained and the performance of fiber members is good; the triptycene unit is introduced into a rigid chain so as to have double functions of space steric hindrance and a benzene ring substitutional group, thereby increasing the molecule width of the polymer and reducingthe action force among the molecules and a melting point; however, the extension direction of the rigid chain is not changed and therefore, a copolymer still keeps good liquid crystal performance andgood mechanical performance. The thermal melting temperature of the liquid crystal polymer is from 280 DEG C to 370 DEG C and mostly from 290 DEG C to 350 DEG C. The liquid crystal polymer can be widely used for electronic electric appliances and parts and components of other precise equipment.

The invention discloses a method for preparing polyvinylidene fluoride (PVDF)-constructed composite particles with a nuclear shell interpenetrating network structure. The method comprises the following steps of: adding deionized water into PVDF seed emulsion, performing ultrasonic dispersion, adding monomers, after the temperature of a system is raised to reaction temperature, adding initiator, and polymerizing; and decompressing the emulsion, drying at low temperature until the weight of the emulsion is constant to prepare the composite particles with the nuclear shell interpenetrating network structure. The composite particles with the nuclear shell interpenetrating network structure are formed based on PVDF seeds, effectively combine the respective characteristics of two polymers, and have complementary advantages of the two polymers; the crystallization temperature of PVDF can be reduced from 142.5 DEG C to 71.4 DEG C in differential scanning calorimetry (DSC); and melting processability of the PVDF, and the compatibility between the PVDF and other polymers which are not compatible with the PVDF are improved, the dielectric performance, piezoelectric performance, ferroelectric performance and other performance of the PVDF can be improved, and the composite particles can be widely applied to the fields of optical fiber coating, outdoor painting and coating, dental repairing and the like.

The invention belongs to the technical field of agricultural plastic mulching film, and more specifically relates to a corn field special-purpose degradable environmental protection mulch film, and apreparation method thereof. The corn field special-purpose degradable environmental protection mulch film comprises, by weight, 90 to 100 parts of linear low density polyethylene, 10 to 15 parts of low density polyethylene, 40 to 50 parts of modified cassava starch, 7 to 12 parts of modified nanometer calcium carbonate, 5 to 10 parts of bagasse powder, 2 to 3 parts of polyvinyl alcohol, 0.08 to 0.2 part of photosensitizer iron stearate, 0.05 to 0.1 part of a phosphite ester type anti-oxidant, 0.3 to 0.5 part of a thermal degradation promoter, 1 to 3 parts of a compatibilizer, and 2 to 5 partsof a plasticizer. The corn field special-purpose degradable environmental protection mulch film is invented based on corn growth rules and light illumination and temperature climate factors; photosensitizer iron stearate, the phosphite ester type anti-oxidant, and the thermal degradation promoter are introduced, so that problems in the prior art that degradation of mulch film in soil is difficultto realize, and degradation induction period is difficult to control are solved; the obtained corn field special-purpose degradable environmental protection mulch film is easily degradable, is green,is friendly to the environment; no white pollution is caused; and field pollution is reduced.

The invention discloses a preparation method of an ultrahigh-conductivity carbon fiber composite wire for 3D printing. The formula comprises the following components: 60-70 parts of HKT800 carbon fiber, 60-64 parts of thermoplastic resin, 5-8 parts of boron trifluoride monoethylamine, 1-4 parts of AG80 epoxy resin, 1-3 parts of antioxidant, 2-5 parts of nanoparticle carrier type catalyst, 2-8 parts of color masterbatch and 4-10 parts of processing aid; and the preparation method comprises the following steps of: preparing the materials according to the formula, and mixing for 2-4min in a high-speed kneading machine; drying for 3-5h in a vacuum drum drying oven at 150 DEG C; and performing extrusion, strip casting, drafting and rolling through a twin-screw extruder to obtain 3D printing carbon fiber composite wires different in wire diameter. The material printed by the 3D printing carbon fiber composite wire has the characteristics of high-temperature resistance, friction resistance, heat conductivity, corrosion resistance and ultrahigh conductivity; the preparation technology is simple and feasible while the cost is low.

A polyurea or polyurea-urethane elastomer comprises a soft polymer segment and a hard polymer segment, wherein the hard polymer segment includes polyurea groups in combination with H-bond accepting chain extenders (HACEs) to reduce the flow temperature (T_flow) while maintaining the excellent mechanical properties such that the resulting polyurea elatomer is rendered melt-processable.