Abstract:
The present invention relates to a method for producing a controlled rheology polypropylene characterised in that it comprises a step of mixing a propylene polymer with at least one organic low-reactivity peroxide. The polypropylene having the rheology according to the present invention can be used for producing fibres, in melt-blown processes, hot-melt adhesives, spun-bonded and injection-moulded articles.
Abstract:
Polymer compositions may include a polymer matrix containing a polyolefin, one or more polymer particles dispersed in the polymer matrix, wherein the one or more polymer particles include a polar polymer selectively crosslinked with a crosslinking agent, and wherein the one or more polymer particles has an average particle size of up to 200 µm. Processes of preparing a polymer composition may include mixing a polyolefin, a polar polymer, and a crosslinking agent; and selectively crosslinking the polar polymer with the crosslinking agent in the presence of the polyolefin. Methods may include increasing stress cracking resistance of a polyolefin by mixing a polar polymer with the polyolefin; and selectively crosslinking the polar polymer in the presence of the polyolefin with a crosslinking agent to form crosslinked polar polymer particles dispersed in the polyolefin.
Abstract:
The present invention is directed to a modified polypropylene comprising from 0.3 to 2 long-chain branches per 1,000 carbon atoms, wherein said long-chain branch has more than 1,000 carbon atoms and 0 to 6% of ethene and/or alpha-olefinic comonomer having 3 to 18 carbon atoms. The polypropylene of the present invention is a homopolymer, a random copolymer, or a heterophasic copolymer. The present invention also relates to large, deep, complex and/or thick articles which are thermoformed from said polypropylene. Furthermore, the present invention relates to the process for thermoforming said modified polypropylene into large, deep, complex and/or thick articles. The present invention also relates to the use of the polypropylene to prepare large, deep, complex and/or thick articles.
Abstract:
The present application refers to a process for the modification of polypropylene, wherein amount, size and configuration of the branches are controlled, the process comprising the steps of (A) preparing a bis(sulphonazide) (BSA) masterbatch by dispersing BSA in polyolefin; (B) adding (i) at least one fatty acid salt with metal cation having valence of 1 + to 3 + ; and (ii) the BSA masterbatch prepared in step (A) to the polypropylene to be modified. Said modified polypropylene of the present invention possesses properties suitable for use in foaming, blowing, thermoforming, recoating, film extrusion, BOPP, spinning processes and other processes and applications, and it is also suitable to be in contact with food products.
Abstract:
The present invention refers to co-extrusion of one or more polyolefins with one or more adhesive layers to improve the adhesiveness of the polyolefins in metal, epoxy resin, glass, ceramics, paper, wood, thermoplastic resin, fabric, non-woven fabric, varnishes and formica. More specifically, the present invention refers to a method of co-extruding at least one polyolefin with an adhesive layer, thereby enhancing the adhesion properties of the polyolefin, particularly in polyurethane foams such that a polar surface is imparted to the obtained adhesived polyolefin.
Abstract:
The present invention relates to a method of compatibilization of polypropylene blends comprising mixing at least one polypropylene with at least one polymer, the mixture being in the presence of a compatibilizing initializing agent. More specifically, the present invention discloses the use of a compatibilizing initiating agent for preparing polypropylene blends having greater impact strength and stiffness, which in turn can be used in processed material products.
Abstract:
Composiciones polimericas pueden incluir una matriz de polimero que contiene una poliolefina, una o mas particulas de polimero dispersadas en la matriz de polimero, donde una o mas particulas de polimero incluyen un polimero polar selectivamente entrecruzado con un agente de entrecruzamiento, y donde una o mas particulas de polimero tienen un tamano de particula promedio de hasta 200 µm. Procesos para la preparacion de una composicion polimerica pueden incluir la mezcla de una poliolefina, un polimero polar y un agente de entrecruzamiento; y el entrecruzamiento selectivo del polimero polar con el agente de entrecruzamiento en presencia de la poliolefina. Metodos pueden incluir el incremento de la resistencia al agrietado por estres de una poliolefina mediante la mezcla de un polimero polar con una poliolefina; y el entrecruzamiento selectivo del polimero polar en presencia de la poliolefina con un agente de entrecruzamiento para formar particulas de polimeros polares entrecruzados dispersadas en la poliolefina
Abstract:
Polymer compositions may include a polymer matrix containing a polyolefin, one or more polymer particles dispersed in the polymer matrix, wherein the one or more polymer particles include a polar polymer selectively crosslinked with a crosslinking agent, and wherein the one or more polymer particles has an average particle size of up to 200 µm. Processes of preparing a polymer composition may include mixing a polyolefin, a polar polymer, and a crosslinking agent; and selectively crosslinking the polar polymer with the crosslinking agent in the presence of the polyolefin. Methods may include increasing stress cracking resistance of a polyolefin by mixing a polar polymer with the polyolefin; and selectively crosslinking the polar polymer in the presence of the polyolefin with a crosslinking agent to form crosslinked polar polymer particles dispersed in the polyolefin.