144 results about "Dibenzylidene sorbitol" patented technology

The present invention provides method of molding a polyolefin-based resin comprising the steps of dissolving at least one dibenzylidene sorbitol compound in a molten polyolefin resin, cooling the molten resin to a temperature not higher than the sol-gel transition temperature during the cooling cycle to form network-like crystals of the dibenzylidene sorbitol compound, and molding the resulting resin composition at a temperature not lower than the melting temperature of the polyolefin-based resin but not higher than the sol-gel transition temperature during the heating cycle; and a polyolefin resin molded article obtainable by this molding method.

This invention relates to a process for preparing alditol acetals, such as dibenzylidene sorbitols, monobenzylidene sorbitols, and the like, through the reaction of unsubstituted or substituted benzaldehydes with alditols (such as sorbitol, xylitol, and ribitol) in the presence of a mineral acid and at least one surfactant having at least one pendant group of 6 carbon chains in length. Such a reaction provides a cost-effective, relatively safe procedure that provides excellent high yields of alditol acetal product. Furthermore, such a specific reaction is also the best known procedure for the production of certain compounds which can be easily separated from other formed isomers. Additionally, such a procedure facilitates the production of certain asymmetric alditol acetal compounds and compositions in acceptable yields as well. Such alditol acetals are useful as nucleating and clarifying agents for polyolefin formulations and articles, as one example.

The present invention relates to dibenzylidene sorbitol (“DBS”)-based compounds. The compounds of this invention are particularly advantageous in that they are characterized by one or more of improved transparency (reduced haze), reduced yellowing and/or improved organoleptics (taste). According to one embodiment, the present invention provides a disubstituted DBS-based compound having an allyl group or a propyl group substituted on the first carbon of the sorbitol chain. The present invention also relates to compositions comprising such DBS-based compounds and methods for using them.

Fluid detergent compositions comprising from about 0.01% to about 1% by weight of an external structurant comprising dibenzylidene sorbitol acetal derivatives for providing desired rheological benefits such as product thickening, shear thinning behavior, as well as particle suspension capabilities.

The invention discloses melt-blown polypropylene as well as a preparation method and application thereof. The melt-blown polypropylene comprises following raw polypropylene resin, a degradation agent,an antioxidant and a lubricant, wherein the degradation agent is selected from one or more of hydrogen peroxide, sodium percarbonate, ammonium percarbonate and urea peroxide. The melt-blown polypropylene also comprises a nucleating agent selected from one or more of dibenzylidene sorbitol, aryl phosphate and nano scale amorphous silicon dioxide, wherein the degradation agent and the nucleating agent respectively account for 0.05-0.5% of the mass percentage of the raw materials. The preparation method comprises the following steps: premixing raw materials, stirring, then selectively adding a deodorant; and melting and granulating by an extruder to obtain the product. The invention also discloses an application of the melt-blown polypropylene in manufacturing melt-blown non-woven fabrics, melt-blown filter elements and sound-absorbing cotton. The melt-blown polypropylene has the advantages of low odor, high electret charge stability and the like.

Unique thermoplastic (polypropylene, specifically) monofilament and/or tape fibers and yarns that exhibit heretofore unattained physical properties are provided. Such fibers are basically manufactured through the extrusion of thermoplastic resins that include a certain class of nucleating agent therein, and are able to be drawn at high ratios with such nucleating agents present, that the tenacity and modulus strength are much higher than other previously produced thermoplastic fibers (particularly those produced under commercial conditions), particularly those that also simultaneously exhibit extremely low shrinkage rates. Thus, such fibers require the presence of certain compounds that quickly and effectively provide rigidity to the target thermoplastic (for example, polypropylene), particularly after heat-setting. Generally, these compounds include any structure that nucleates polymer crystals within the target thermoplastic after exposure to sufficient heat to melt the initial pelletized polymer and allowing such an oriented polymer to cool. The compounds must nucleate polymer crystals at a higher temperature than the target thermoplastic without the nucleating agent during cooling. In such a manner, the "rigidifying" nucleator compounds provide nucleation sites for thermoplastic crystal growth. The preferred "rigidifying" compounds include dibenzylidene sorbitol based compounds, as well as less preferred compounds, such as [2.2.1]heptane-bicyclodicarboxylic acid, otherwise known as HPN-68, sodium benzoate, talc, certain sodium and lithium phosphate salts [such as sodium 2,2'-methylene-bis-(4,6-di-tert-butylphenyl)phosphate, otherwise known as NA-11]. Specific methods of manufacture of such inventive thermoplastic fibers, as well as fabric articles made therefrom, are also encompassed within this invention.

Certain thermoplastic additives (combinations of clarifying and nucleating compounds) that induce simultaneously low clarity and high nucleation efficacy are provided. Such additives include combinations of certain bicyclic salts (which by themselves induce very high nucleation efficacy) and thermoplastic clarifying agents, including certain dibenzylidene sorbitol acetals and derivatives (hereinafter collectively referred to as "DBSs")(which alone provide very low haze measurements and thus highly desirable clarity characteristics). In comparison, other types of standard thermoplastic nucleators, such as sodium benzoate and sodium 2,2'-methylene-bis-(4,6-di-tert-butylphenyl) phosphate provide relatively high peak crystallization temperatures, but do not combine synergistically with clarifiers, such as DBSs, to provide the same results as for the inventive combination of bicyclic salts and DBSs. Thermoplastic compositions as well as thermoplastic additive packages comprising such inventive nucleator compounds, as well as methods of producing polypropylene compositions and articles made therefrom, are also contemplated within this invention.

Unique thermoplastic monofilament fibers and yarns that exhibit heretofore unattained physical properties are provided. Such fibers are basically manufactured through the extrusion of thermoplastic resins that include a certain class of nucleating agent therein, and are able to be drawn at high ratios with such nucleating agents present, that the tenacity and modulus strength are much higher than any other previously produced thermoplastic fibers, particularly those that also simultaneously exhibit extremely low shrinkage rates. Thus, such fibers require the presence of certain compounds that quickly and effectively provide rigidity to the target thermoplastic (for example, polypropylene), particularly after heat-setting. Generally, these compounds include any structure that nucleates polymer crystals within the target thermoplastic after exposure to sufficient heat to melt the initial pelletized polymer and allowing such an oriented polymer to cool. The compounds must nucleate polymer crystals at a higher temperature than the target thermoplastic without the nucleating agent during cooling. In such a manner, the "rigidifying" nucleator compounds provide nucleation sites for thermoplastic crystal growth. The preferred "rigidifying" compounds include dibenzylidene sorbitol based compounds, as well as less preferred compounds, such as [2.2.1]heptane-bicyclodicarboxylic acid, otherwise known as HPN-68, sodium benzoate, certain sodium and lithium phosphate salts [such as sodium 2,2'-methylene-bis-(4,6-di-tert-butylphenyl)phosphate, otherwise known as NA-11]. Specific methods of manufacture of such inventive thermoplastic fibers, as well as fabric articles made therefrom, are also encompassed within this invention.

The invention discloses a heat-resistant flame-retardant power cable protective pipe, which comprises polypropylene, nylon, ethylene-octene copolymer grafted maleic anhydride, acfylonitrile-butadiene-styrene copolymer, polyethylene glycol terephthalate, nano-silica sol, graphene oxide, nanosized mesoporous silicon dioxide, nano calcium carbonate, wollastonite, nano-aluminium hydroxide, carbon nanofibres, trimethyl phosphate, zinc borate, expansible graphite, naphthenic oil, maleimide, antioxygen, lanthanum stearate, (3, 4 - dimethyl) dibenzylidene sorbitol and 2, 2 - methylene - double (4, 6-2 tert butyl phenoxy) sodium phosphate. The heat-resistant flame-retardant power cable protective pipe is excellent in flame retardant, perfect in heat resistance and aging resistance, can meet the use demands in various fields, and is long in service life.

Certain multi-substituted dibenzylidene sorbitol acetals having electron withdrawing groups as constituents and electron donating groups on the other such that the compounds are asymmetric in structure and are dipolar in nature are provided. Polymer compositions comprising such compounds, are also contemplated which may be utilized within, as merely examples, food or cosmetic containers and packaging. These inventive asymmetric dipolar dibenzylidene sorbitol acetals are also useful as gelling agents for water and organic solvents, particularly those used in the preparation of antiperspirant gel sticks.

The invention relates to the technical field of blood collection equipment separation gel manufacture, and in particular relates to a blood separation gel used for a blood collection vessel and a preparation method thereof. After the blood separation gel is mixed with blood, thixotropy is caused by shearing force to divide the blood into three layers namely hemocyte visible components/ separation gel/serum or blood plasma. The blood separation gel comprises the following components: proportion regulator chlorcosane, organic gelling agent dibenzylidene sorbitol, thixotropic agent nano silica, viscosity regulator polyisobutene and the like. The preparation method comprises the following steps: adding polyisobutene, chlorcosane and dibenzylidene sorbitol in an planetary mixer, heating to 120 DEG C and then fully stirring and mixing; fully dissolving and evenly stirring the components and then cooling to less than 60 DEG C; adding nano silica; decompressing, vacuumizing, stirring and evenly mixing, and cooling to room temperature, so as to obtain the blood separation gel. According to the invention, the physical characteristic of the blood separation gel is obviously improved; and the blood separation gel prepared by the method provided by the invention can bear gamma rays in conventional sterilization amount, and is suitable for the environment which requires precise blood detection.

Disclosed is a polyolefin resin composition which has an excellent transparency even when the polyolefin resin has a high melt flow rate (MFR).

The polyolefin resin composition comprises a polyolefin resin having a melt flow rate (MFR) at 230° C. of 20 dg/min or more, (A) a dibenzylidene sorbitol compound represented by the following general formula (1),

(wherein n represents an integer of 0 to 2; and R¹, R², R³, R⁴, and R⁵ each independently represent a hydrogen atom or the like) and (B) an alkali metal salt compound of organic phosphoric acid ester represented by the following general formula (2),

(wherein R⁶ to R⁹ each independently represent a hydrogen atom or the like),

and wherein the sum of the amount of the component (A) and the component (B) is 0.01 to 1.0 part by mass per 100 parts by mass of the polyolefin resin, and (A)/(B), the ratio (mass ratio) between the component (A) and the component (B), is within a range from 99/1 to 80/20.

The invention relates to a composition, which contains 0.2 to 0.3wt percent of 1,3,2,4-Dibenzylidene sorbitol and the remaining residual percent of random copolymerized polypropylene. The composition of the invention is applicable to preparing water heater container; the water heater container prepared with the composition of the invention has good surface gloss, rigidity, heat distortion temperature, creep resistance and shorter molding cycle and lower production cost. Test data shows that an amount of 0.3 percent of the TM-1 added in a copolymerized polypropylene and homo polypropylene injection molding product is capable of improving the surface gloss of the product from more than 60 degrees to 110 degrees and improving the heat distortion temperature by at least 130 DEG C; an amount of 0.3 percent of the TM-1 added in a 1mm PP sheet is capable of reducing the turbidity by 67 percent. The product of the invention is also applicable to the technical fields such as rigidity improvement, antireflection of polypropylene and gloss improvement of injection molding products.

The invention provides a high-strength and low-temperature-resistant plastic bucket and a preparation method thereof. The preparation method comprises the following steps: (1) putting polyethylene, nano-modified epoxy resin and glass-fiber-reinforced vinyl ester resin into a mixer, and evenly stirring and mixing at certain temperature; (2) sequentially adding aramid fibers, basalt fibers, dibenzylidene sorbitol, an ultraviolet light absorber UV-326, an antioxidant 1010, an antioxidant 168, oxidized polyethlene wax and activated quartz powder into the mixer, and evenly stirring and mixing; (3) heating an obtained mixture, putting the heated mixture into a double-screw extruder and extruding plastic particles; (4) putting the plastic particles into an extrusion hollow blow molding machine, and extruding a tubular blank material; (5) putting the tubular blank material into a mould of the extrusion hollow blow molding machine, controlling the temperature of the mould and the pressure of the compressed air, and carrying out hollow blowing to obtain the plastic bucket. The plastic bucket provided by the invention is good in low temperature impact resistance and tensile strength, is non-toxic and harmless, and simple and practicable in technology.