摘要:
Provided herein are polyolefin-based compositions useful for making rotomolded parts having useful properties, including those related to impact resistance and color. In one aspect, there are provided compositions comprising (a) a rotational molded polyolefin, comprising a resin, wherein the resin is polyethylene or a copolymer thereof, having a melt index (Ml) ranging from about lg/10 minutes to about lOg/10 minutes; and (b) an additive package comprising: (i) an antioxidant; (ii) a processing stabilizer; (iii) optionally a UV light stabilizer; (iv) optionally a fatty acid-based acid scavenger comprising a metal salt of a fatty acid; and (v) a dihydrotalcite-based acid scavenger present in the composition at between about 800 ppm to about 3,000 ppm. In some embodiments, the ARM Impact Percent Ductility is greater than or equal to about 60% for a molded part made from the cured composition and measured after the composition has been cured between 18-24 minutes at a temperature of 550 °F (288 °C).
摘要:
This disclosure provides for compatibilizer compositions that are useful in compounding polypropylenes and ethylene elastomeric copolymers for injection molding applications. The compatibilizer includes a combination of: Component A of polypropylene homopolymers or polypropylene copolymers containing small amounts of ethylene; and Component B of propylene bipolymers with ethylene and/or other a-olefin comonomers, the bipolymer having a relatively high proportion of propylene moieties, for example, 50-75% propylene. Compared to known or conventional compatibilizer formulations, the bipolymer Component B is relatively propylene rich and generally can be used in the injection molding composition in lower concentrations.
摘要:
The present disclosure relates to catalysts comprising two heterogeneous chromium catalysts for the polymerization of olefins are provided herein. The catalysts, as well as related compositions and methods using the same, may be used to for the production of polyolefins, including for the production of bimodal molecular weight distribution polyolefins, e.g., polyethylene and copolymers of etliylene and 1-hexene.
摘要:
The present disclosure provides a polyolefin-based composition made from or containing: (A) a first polymer composition made from or containing a high density polyethylene having a density greater than about 0.940 grams per cubic centimeter and a melt index greater than about 4 grams per 10 minutes, measured according to ASTM D 1238, using a piston load of 2.16 kg and at a temperature of 190 degrees Celsius, and (B) a first nucleator composition made from or containing a salt of 4-(4-chlorobenzoylamino) benzoate. The polyolefin-based composition is useful for making articles of manufacture for rigid applications, including low temperature, thin-walled applications.
摘要翻译:本发明提供了一种基于聚烯烃的组合物,该组合物由以下组分制成或包含:(A)由高密度聚乙烯制成或含有高密度聚乙烯的第一聚合物组合物,所述高密度聚乙烯的密度大于约0.940克每立方厘米, 根据ASTM D 1238使用2.16kg的活塞载荷和190℃的温度测量的大于约4克/ 10分钟的熔体指数,和(B)由4或4的盐制成或含有4的盐的第一成核剂组合物 - (4-氯苯甲酰氨基)苯甲酸甲酯。 基于聚烯烃的组合物可用于制造用于刚性应用(包括低温,薄壁应用)的制品。 p>
摘要:
The present disclosure generally relates to a silica-titanium catalyst prepared by first reacting a solid support with a metal alkoxide and then depositing titanium onto the solid support for the epoxidation of alkenes and aralkenes and a method of preparing the catalyst thereof, in some embodiments, the present disclosure relates to methods of using the catalyst described herem for the production of epoxides.
摘要:
The present technology relates to the production and recovery of acetic acid. The recovery processes may include providing a first process stream including acetic acid and greater than 250 ppm of propionic acid; separating at least a portion of the propionic acid from the acetic acid within the first process stream to provide an acetic acid stream including acetic acid and less than 250 ppm of propionic acid and a bottoms stream including propionic acid and acetic acid; reacting the bottoms stream to form a product stream including components of respectively lower boiling points than corresponding components in the bottoms stream; and separating components of the product stream to form, an overhead stream including one or more acetates and a bottoms stream including one or more propionates.
摘要:
Processes for producing acetic acid are presented herein. One or more embodiments include processes for controlling downstream water concentration in acetic acid production process including contacting methanol and carbon monoxide in the presence of a reaction medium under carbonylation conditions sufficient to form a carbonvlation product including acetic acid, wherein the reaction medium includes a carbonylation catalyst, water in an upstream water concentration of from 1 wt.% to 14 wt.% water, and a tertiary phosphine oxide; recovering acetic acid from the carbonylation product: and controlling a downstream water concentration by determining a target water concentration and introducing the tertiary phosphine oxide to the reaction medium at a rate, basicity, concentration or combination thereof sufficient to provide a downstream water concentration within 1 wt.% of the target water concentration.
摘要:
The present disclosure generally relates to strainers for removing particulates from fluid media, including filter assemblies for strainers having improved sealing and straining characteristics.
摘要:
The present disclosure relates to processes for the removal of paraffins. The processes generally include providing a C 4 containing stream including isobutylene, 1 -butene, 2-butene, n- butane and isobutane, introducing the C 4 containing stream into a paraffin removal process to form an olefin rich stream, wherein the paraffin removal process is selected from extractive distillation utilizing a solvent including an organonitrile, passing the C4 containing stream over a semi-permeable membrane and combinations thereof; and recovering the olefin rich stream from the paraffin removal process, wherein the olefin rich stream includes less than 5 wt.% paraffins.
摘要:
Adhesive compositions, processes of forming adhesive compositions, and multi -layer films are discussed herein. Hie processes generally include contacting an olefin monomer with a catalyst system within a polymerization zone to form an olefin based polymer under polymerization conditions sufficient to form the olefin based polymer, the catalyst system including a metal component generally represented by the formula: MR X ; wherein M is a transition metal, R is a halogen, an aikoxy, or a hydrocarboxyl group and x is the valence of the transition metal, wherein the catalyst system further includes an internal donor (ID) comprising a C 3 -C 6 cyclic ether: and withdrawing the olefin based polymer from the polymerization zone; and melt blending the olefin based polymer with a functionalized poly olefin to form a polyolefm based adhesive composition, wherein the process is an in-line process.
摘要翻译:本文讨论了粘合剂组合物,形成粘合剂组合物的过程和多层膜。 方法通常包括使烯烃单体与催化剂体系在聚合区内接触以在足以形成烯烃基聚合物的聚合条件下形成烯烃基聚合物,所述催化剂体系包含通常由下式表示的金属组分:MR X 子>; 其中M是过渡金属,R是卤素,烷氧基或烃基,并且x是过渡金属的化合价,其中所述催化剂体系进一步包括含有C 3键的内给体(ID) C 6 -C 6环醚:从聚合区中取出烯烃基聚合物; 和将烯烃基聚合物与官能化聚烯烃熔融共混以形成基于聚烯烃的粘合剂组合物,其中该方法是在线方法。 p>