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22971 results about "Polyolefin" patented technology

A polyolefin is a type of polymer produced from a simple olefin (also called an alkene with the general formula CₙH₂ₙ) as a monomer. For example, polyethylene is the polyolefin produced by polymerizing the olefin ethylene. Polypropylene is another common polyolefin which is made from the olefin propylene.

High-melting polyolefin copolymer elastomers, catalysts and methods of synthesis

This invention relates to high melting polyolefin copolymers suitable as thermoplastic elastomers and catalysts and methods for their synthesis. These elastomeric olefin copolymers are characterized by a mole fraction of crystallizable component Xc from about 30 to about 99%; low glass transition temperatures, below -20° C., and typically below -50° C.; melting points above about 90° C.; high molecular weights; a molecular weight distribution MW / Mn< / =10; and a narrow composition distribution between chains of < / =15%. The novel copolymers of the invention range from reactor blends to multiblock copolymers that can be sequentially fractionated into fractions of differing crystallinities, which fractions nevertheless show compositions of comonomers which differ by less than 15% from the parent polymer (reactor product). The invention also relates to a process for producing such copolymers by utilizing an unbridged, substituted or unsubstituted cyclopentadienyl metallocene catalyst that is capable of interconverting between states with different copolymerization characteristics, which interconversion is controlled by selecting the substituents of the cyclopentadienyl ligands so that the rate of interconversion of the two states is within several orders of magnitude of the rate of formation of a single polymer chain. Where ri>rf the polymer can be characterized as multiblock; where ri<rf, the result is a polymer blend and where ri / rf is close to 1, the resulting polymer is a mixture of blend and multiblock. The metallocene catalysts of the invention are able to interconvert between more than two states, with embodiments of four states being shown in FIG. 2.

Polymer blends from interpolymers of ethylene/alpha-olefins and flexible molded articles made therefrom

ActiveUS20060211819A1Polymer sciencePolyolefin
Polymer blends comprises 1) at least one ethylene / α-olefin interpolymer and 2) at least one polyolefin, or at least one styrenic block copolymer, or a combination thereof. Such polyolefins include, but are not limited to, high melt strength high density polyethylene and high melt strength polypropylene. The ethylene / α-olefin interpolymers are random block copolymers comprising at least a hard block and at least a soft block. The polyolefins can be homopolymers or interpolymers. The resulting polymer blends can be used to make flexible molded articles.

Bicyclo[2.2.1]heptane dicarboxylate salts as polyolefin nucleators

InactiveUS6465551B1Exceptional nucleation efficacyExcellent calcium stearate compatibilityOrganic chemistryOrganic compound preparationChemistryPolyolefin
Compounds and compositions comprising specific metal salts of bicyclo[2.2.1 ]heptane dicarboxylate salts in order to provide highly desirable properties within polyolefin articles are provided. The inventive salts and derivatives thereof are useful as nucleating and / or clarifying agents for such polyolefin, provide excellent crystallization temperatures, stiffness, and calcium stearate compatibility within target polyolefin. Also, such compounds exhibit very low hygroscopicity and therefore excellent shelf stability as powdered or granular formulations. Polyolefin additive compositions and methods of producing polyolefin with such compounds are also contemplated within this invention.

Polymer blends from interpolymers of ethylene/alpha-olefin with improved compatibility

Disclosed herein are polymer blends comprising at least one ethylene / α-olefin interpolymer and two different polyolefins which can be homopolymers. The ethylene / α-olefin interpolymers are block copolymers comprising at least a hard block and at least a soft block. In some embodiments, the ethylene / α-olefin interpolymer can function as a compatibilizer between the two polyolefins which may not be otherwise compatible. Methods of making the polymer blends and molded articles made from the polymer blends are also described.

Application of supported non-metallocene catalyst in ethene polymerization process by slurry method

The invention discloses an application of load non- metallocene catalyst in the slurry process for vinyl polymerying, the load non- metallocene catalyst and catalyst promoter forming the catalytic system, the alkene polymerization comprising: vinyl homopolymerization, combined polymerization of vinyl with propylene, butylenes, hexane, octane or norbornene; the catalyst carrier being chosen from: inorganic oxide of metallic oxide from IIA, IIIA, IVA, and IVB groups, or oxided mixture and mixing oxide; the catalyst promoter being chosen from: methylaluoxane, ethylaluoxane, isobutylaluoxane, trimethylaluminum,triethylaluminum,triisobutylaluminum,methylaluoxane-trimethylaluminum or methylaluoxane-triethylaluminum; the mole proportion between the catalyst promoter and catalyst being Al / Ti= 1:1-500. The inventioin is characterized by the less methylaluoxane consumption, stable reaction, easy-to-control polymerization temperature and non still-sticking phenomenon. The produced polyolefine possesses perfect granual shape, and the maximum polymer clamp density can reach 0.385 g / ml.

Rheology modification of interpolymers of ethylene/alpha-olefins and articles made therefrom

ActiveUS20060199908A1Polymer sciencePolyolefin
Rheology modification of an ethylene / α-olefin interpolymer is achieved by blending the interpolymer with at least one branched polyolefin. The polyolefins can be homopolymers or interpolymers and have a branching index of less than 1. The ethylene / α-olefin interpolymer is a block copolymer having at least a hard block and at least a soft block. The soft block comprises a higher amount of comonomers than the hard block. The block interpolymer has a number of unique characteristics disclosed here. Rheology-modified ethylene / α-olefin interpolymer, i.e., the resulting polymer blends, can be extruded or molded into many useful articles, such as films, sheets, profiles, gaskets, foams, etc.

Highly active supporting method of non-metallocene catalyst

A method of non- metallocene catalyst loading with high active: the carrier and chemical activating agent reacting with each other to get the modification carrier; dissolving the magnesium compounds into the tetrahydrofuran-alcohol mixing system to form solution, adding the modification carrier into the solution for reaction, filtering, washing, drying and sucting to get the composite carrier; dissolving the non- metallocene catalyst for lkene polymerization into the dissolvent, then reacting with the composite carrier and through process of washing, filtering and drying to get the load non- metallocene catalyst. It can also be: proceeding heating activating treatment before the reaction of carrier with the chemical activating agent; the composite carrier reacting with chemical additive before reacting with catalyst to get the modification composite carrier, the modification composite carrier reacting with catalyst to get the load non- metallocene catalyst. The load catalyst produced in this invention is high active; the load catalyst of high property can be produced with less methylaluoxane; the polyolefine produced with the catalyst prepared in this invention possesses sound granual shape.

Interpolymers of ethylene/a-olefins blends and profiles and gaskets made therefrom

ActiveUS20060199905A1PolyolefinPolymer science
Polymer blends comprise at least an ethylene / α-olefin interpolymers and at least one polyolefin. The polyolefins can be homopolymers or interpolymers and have a melt strength of at least about 6 cN. The ethylene / α-olefin interpolymer is a block copolymer having at least a hard block and at least a soft block. The soft block comprises a higher amount of comonomers than the hard block. The block interpolymer has a number of unique characteristics disclosed here. The polymer blends can be profiled extruded to make profiles, gaskets, and other products.

Web materials having both plastic and elastic properties

InactiveUS20050215964A1Plastic propertyElastic propertyBaby linensWoven fabricsFiberPolyolefin
An extruded web is disclosed. The extruded web can be either a nonwoven material of a films. The web comprises a plasto-elastic material where the plasto-elastic material is a combination of a first polyolefin and a second polyolefin (either a polymeric blends or a polymeric mixture). The claimed combination of polyolefins results in a material that has substantially plastic properties when a sample taken from said web is subjected to an initial strain cycle (such that the web is provided with a set of at least 30% by an initial strain cycle) and substantially elastic properties when a sample taken from the web is subjected to at least a second strain cycle.
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