摘要:
The present invention relates to reactive purge compound for cleaning polymer processing equipment wherein the reactive purge compound that includes i) at least about 50 wt.% of a polymeric carrier component based on the total weight of the reactive purge compound; and ii) a chain scission catalyst component dispersed in the polymeric carrier component; wherein a) the chain scission catalyst component includes a chain scission catalyst selected from the group consisting of at least one alkali metal hydroxide, at least one alkaline earth metal hydroxide, and any combination thereof; b) the reactive purge compound further comprises a water generating component; or c) both (a) and (b); wherein the reactive purge compound is a feedstock material in the form of a plurality of pellets, granules, rods, powder or other particles.
摘要:
The present invention relates to reactive purge compound for cleaning polymer processing equipment wherein the reactive purge compound that includes i) at least about 50 wt.% of a polymeric carrier component based on the total weight of the reactive purge compound; and ii) a chain scission catalyst component dispersed in the polymeric carrier component; wherein a) the chain scission catalyst component includes a chain scission catalyst selected from the group consisting of at least one alkali metal hydroxide, at least one alkaline earth metal hydroxide, and any combination thereof; b) the reactive purge compound further comprises a water generating component; or c) both (a) and (b); wherein the reactive purge compound is a feedstock material in the form of a plurality of pellets, granules, rods, powder or other particles.
摘要:
Ethylene is copolymerized or interpolymerized with at least one olefinic comonomer having about 3 to 18 carbon atoms to produce linear low density polyethylene copolymers and terpolymers in a slurry process using liquid propane as the diluent. The copolymer products have desirable physical properties including relatively narrow molecular weight distributions and low elasticities.
摘要:
Composite structures comprising one or more substrates and an adhesive blend comprising blends of a non-elastomeric graft copolymer of a non-polar ethylene homopolymer or copolymer backbone grafted with at least one grafting monomer comprising one or more of polymerizable ethylenically unsaturated carboxylic acids or the anhydrides of such acids blended with an elastomer-free blending resin that is a mixture of one or more linear low density polyethylenes and one or more polypropylenes.
摘要:
Compositions of matter having properties that make them strong adhesives to various substrates and especially for extrusion adhesion to various polar substrates. These compositions comprise blends of a graft copolymer of a polyethylene backbone grafted with at least one grafting monomer comprising one or more polymerizable ethylenically unsaturated carboxylic acids or the anhydrides of such acids blended with a blending resin that is a mixture of one or more high density polyethylenes and one or more polypropylenes. The disclosure also includes composite structures and their method of making comprising one or more substrates and a blend of the above as the adhesive in contact with and united with the substrate or substrates.
摘要:
A new catalyst and a method of polymerizing olefins in which the catalyst is prepared (1) by forming a mixture by dispersing on a finely divided, difficult to reduce, inorganic support of silica, alumina, thoria, zirconia, titania, magnesia or mixtures of these a tetravalent or lower valent organic chromium compound, (2) calcining the mixture of (1) in an oxidizing or inert atmosphere and at an elevated temperature to produce a chromium compound on the support, (3) reacting the product of (2) with an alkyl ester of titanium, boron, vanadium or mixtures thereof at an elevated temperature, and (4) activating the product of (3) with a dry gas that contains oxygen by heating at an elevated temperature the product of (3) in this dry gas.
摘要:
A method of polymerizing a monomer comprising ethylene in which a catalyst used is prepared by dispersing on a dry, finely divided, difficultly reducible inorganic oxide support such as silica a reaction product prepared by reacting pinacol with a chromium compound in which the reaction product is fixed to the support by heating at an elevated temperature in a non-oxidizing atmosphere.
摘要:
Methods of making polymers from polymerizable 1-olefins which comprise polymerizing at least one 1-olefin with a catalyst system consisting essentially of a mixture of (1) a support which is a finely divided insoluble inorganic support material such as silica, alumina, zirconia or thoria or mixtures thereof containing titanium, zirconium or nickel prepared by fluidizing the finely divided support in the form of a bed with a substantially dry gas while adding to the bed at an elevated temperature, while fluidizing, a compound of the class consisting of titanium or zirconium or nickel esters, or halides or mixtures thereof which were further calcined at a higher temperature and (2) an organotin chromate containing the group essentially of the formula ##EQU1## and (3) cocatalytic amounts of an alkyl aluminum compound of the formula R.sub.a AlX.sub.b in each of which formula R is a hydrocarbon radical containing from 1 to about 14 carbon atoms, X is hydrogen, halogen or alkoxy, a is an integer of 1 to 3, b is an integer of 0 to 2 and the sum of a and b is 3, the system having an aluminum-chromium ratio of at least 2 to 1.
摘要:
The present invention provides a resin composition that is added when a multi-layer structure containing hydrolyzed ethylene-vinyl acetate copolymer is reground into a multi-layer structure and a process for preparing a multi-layer structure using the resin composition. Specifically, the present invention relates to a resin composition comprising (A) polyolefin, (B) metal salt of higher fatty acid having 12 to 30 carbon atoms and (C) zeolite. Also, the multi-layer structure is prepared by the process of regrinding by adding the resin composition to a multi-layer structure containing hydrolyzed ethylene-vinyl acetate copolymer.
摘要:
A fastener assembly, such as a nail assembly, includes a row of fasteners held together and maintained in position by an extrudable thermoplastic adhesive composition containing a particulate filler, an extrudable thermoplastic resin reacted with a polar compound, and optional quantities of an additional thermoplastic resin. The adhesive composition provides the fastener assembly with increased rigidity, reduced bending and buckling, and reduced shearing requirements for separating an individual fastener from the row. The invention also includes an adhesive composition useful in the fastener assembly.