Shell Oil Comapny

Union Carbide Chemicals & Plastics Technology Corporation

Celanese Gmbh

Shell Polypropylene Company

Ananda M Chatterjee

Earl E Hayden

Robert C Job

Thomas F Brownscombe

Charles C Hwo

Joseph Patrick Salanitro

James D McCullough, Jr

Patrick M Hughes

Dale J Wilpers

Donald H Weinkauf

Randolph N Campbell

James Douglas McCullough, Jr

This invention relates to novel extrusion coating compositions containing certain high melt flow, narrow molecular weight distribution polypropylene impact or random copolymers and composite articles comprising a substrate having such compositions melt extruded thereon.

Extrusion coating composition

The present invention relates to compositions containing impact copolymer compositions that are a blend of a propylene polymer phase and a rubber phase in which the ethylene content of the rubber phase is between about 75 to about 95% by weight. The rubber content of the impact copolymer composition ranges between about 35% by weight to about 60% by weight. The crystallinity of the high ethylene-content rubber phase provides overall improvement in film properties and also balance of film tensile properties in the machine and transverse directions. Compared to traditional impact copolymer compositions having a low ethylene content-rubber phase, the inventive copolymers have significantly enhanced melting and crystallization peaks due to polyethylene-like crystallinity in the rubber phase.

Compositions containing impact copolymers made from a blend of a homopolymer phase and a rubber phase having a high ethylene content

A polymer composition having improved balanced mechanical and optical properties comprising (i) a random copolymer comprising from about 0.8% to about 20% by weight of butene-1 and from about 80% to about 99.2% by weight of propylene, and (2) from about 0%-0.35% by weight of polymer composition of a synthetic amorphous silica antiblock agent.

Random copolymer compositions

Polypropylene impact copolymer compositions are provided which contain a homopolymer phase of predominantly homopolymeric polypropylene, a copolymer phase of copolymerized ethylene and propylene, and a nucleating agent. The inventive compositions have a rubber content (Fc) in the range of 25 to 45% by weight, a crystallization temperature in the range of 122 to 132.degree. C., a melt flow in the range of about 7 to about 60 dg/min, and a ratio of the intrinsic viscosity of the copolymer phase to the intrinsic viscosity of the homopolymer phase of 1.4 to about 1.9. The polypropylene impact copolymer compositions may be used to form cast films which preferably are soft, quiet, and suitable for use in products to be used next to the skin, such as diapers, adult incontinence pads and feminine hygiene products.

Polymer compositions and cast films

Polypropylene random copolymer resins and metallized, heat sealable cast films produced from such resins include (1) a polypropylene-.alpha.-olefin random copolymer such as a propylene-butene-1 or propylene-ethylene random copolymer and (2) an additive package including a synthetic amorphous silica, a hindered phenolic antioxidant, a processing stabilizer and an acid acceptor. The compositions according to the invention are useful for the preparation of metallized, heat sealable packaging films suitable for protecting goods, particularly goods requiring a long shelf life such as foods or semiconductor products.

Metallizable polypropylene random copolymer compositions

Polypropylene impact copolymer compositions are provided which contain a homopolymer phase of predominantly homopolymeric polypropylene, a copolymer phase of copolymerized ethylene and propylene, and a nucleating agent. The inventive compositions have a rubber content (Fc) in the range of 25 to 45% by weight, a crystallization temperature in the range of 122.degree. to 132.degree. C., a melt flow in the range of about 7 to about 60 dg/min, and a ratio of the intrinsic viscosity of the copolymer phase to the intrinsic viscosity of the homopolymer phase of 1.4 to about 1.9. The polypropylene impact copolymer compositions may be used to form cast films which preferably are soft, quiet, and suitable for use in products to be used next to the skin, such as diapers, adult incontinence pads and feminine hygiene products.

Polymer compositions comprising .alpha.-olefin polymers and a minor proportion of synthetic basic zeolite are stabilized against the harmful effects of corrosion of metal surfaces when processed through mechanical equipment such as molds and extruders where the composition normally contacts metal surfaces.

Polymer compositions

A polymer composition having a good balance of improved mechanical properties and optical properties such as low haze, which comprises

This invention relates to a continuous process for incorporating additives into or onto polymer granules by high speed/high intensity mixing of entrained polymer granules and additive particles, wherein the additive is provided in the form of an additive dispersion.

Post-polymerization additive incorporation process

A crystallizable thermoplastic polymer composition is prepared by adding a small amount of a substantially graphitic non-turbostratic carbon to a polyketone polymer. The graphitic carbon acts as a nucleating agent, increasing the crystallization rate of polyketone polymer.

Polyketone containing graphite nucleating agent

In-reactor stabilization of polymers via coated stabilizers

A low temperature process for coating polymer granules with additives in order to modify the properties of the polymer comprises contacting a fluidized bed of the polymer granules with an aqueous dispersion of additives.

Process for coating polyolefin granules in a fluidized bed

Blends of polypropylene, poly(3-hydroxybutyrate) or poly(3-hydroxybutyrate-3-hydroxyvalerate) and metal stearates are both photodegradable and biodegradable.

Environmentally degradable polymer composition

The present invention includes a coated polyolefin particle and a method for post-reactor stabilization of polyolefins comprising: melting a polyolefin wax; blending at least one additive into the liquid polyolefin wax; fluidizing polyolefin particles to be stabilized with a hot gas; spraying the liquid polyolefin wax containing at least one additive on the fluidized polyolefin particles, and forming at least partially coated polymer particles; maintaining the at least partially coated polymer particles and fluidized polyolefin particles at a temperature which is sufficiently high to prevent the formation of fibers from the wax and which enhances the formation of stabilized polymer particles.

Growing community of inventors

Katy, TX, United States of America

Ananda M Chatterjee