Abstract: Polymer particles containing a polymer of a vinylarene monomer, a porous silicate compound and at least 1.5% by weight of water, based on the weight of vinylarene, water and porous silicate compound, wherein the porous silicate compound is selected from alumino silicates and amorphous silica particles, and a process for the preparation of such polymer particles.
Type:
Grant
Filed:
July 19, 2000
Date of Patent:
March 4, 2003
Assignee:
Nova Chemicals (International) S.A.
Inventors:
Michel Florentine Jozef Berghmans, Carolus Matthias Anna Maria Mesters, Alphonsus Catharina Gerardus Metsaars, Eric Wilhelmus Johannes Frederik Neijman, Ján Pallay
Abstract: The space time yield of a gas phase reactor, particularly a polyethylene reactor may be increased by replacing at least 80 weight % of the ballast gas with a gas having a higher heat capacity than the ballast gas. Preferably the gas replacing the ballast gas is a stream of dilute ethylene having a high concentration of ethane.
Abstract: A plastic film having a desirable balance of physical properties is prepared using a pseudohomogeneous linear low density polyethylene (lldpe) resin on a blown film extrusion line. The lldpe used in this invention must have a melt index, I2, of from 0.4 to 0.8 grams per 10 minutes, a base resin density of from 0.915 to 0.919 grams per cubic centimeter and a copolymer/homopolymer (COHO) ratio of from 3 to 9. The film must be prepared under specific extrusion conditions using a specific annular extrusion die. The film of this invention has a dart impact strength of greater than 600 grams per mil and a machine direction tear strength of greater than 350 grams per mil and is suitable for the preparation of packaging and trash bags.
Type:
Application
Filed:
April 2, 2002
Publication date:
January 23, 2003
Applicant:
NOVA Chemicals (International) S.A.
Inventors:
John Bayley, Peter Andrew Sipos, Nakul Ulhas Ranade
Abstract: Novel ethylene styrene interpolymers having atactic ES repeating units and an alternating structure substantially higher than that predicted using Bernoullian statistics may be prepared in the presence of a transition metal phosphinimine compound and an activator.
Type:
Application
Filed:
June 28, 2001
Publication date:
January 16, 2003
Applicant:
NOVA Chemicals (International) S.A.
Inventors:
Qinyan Wang, Patrick Lam, Garry Takashi Yamashita
Abstract: A solution polymerization process using a phosphinimine catalyst and a boron activator is conducted at a temperature of about 170° C. or greater in the presence of trialkyl aluminum to produce polyethylene having a comparatively broad molecular weight distribution. The polyethylene product produced by the process of this invention is desirable because it can provide enhanced “processability” in comparison to polyethylene having a narrow molecular weight distribution. The process of this invention is advantageous in comparison to prior art processes for the preparation of “broad” polyethylene which use two polymerization reactors and/or more than one polymerization catalyst. The polymers produced by the process of this invention are potentially suitable for the preparation of plastic film. For example, a polyethylene according to this invention and having a density of about 0.
Type:
Application
Filed:
April 17, 2002
Publication date:
January 2, 2003
Applicant:
NOVA Chemicals (International) S.A.
Inventors:
Stephen John Brown, John William Swabey, Christopher John Brooke Dobbin
Abstract: A new and distinct hybrid of Tiarella plant characterized by its unique creeping habit with good vigor, fine leaf fonn and coloration, and showy white flowers.
Abstract: A magnetic resonance imaging system comprises: a housing providing a medical diagnostic chamber for a subject therewithin lying along an axis. The housing contains: a transmit/receive inductor system having a coil about the axis in proximity with the housing, a gradient inductor system having a coil operatively associated with the transmit/receive inductor system, and a field inductor system having a coil operatively associated with the transmit/receive inductor system. The field coil establishes a supervening field about the entire system. The gradient coil initiates perturbations in the fields and produces signals derived responsively from the perturbations. The transmit/receive coil includes a series of electrical transmission line elements paraxially distributed with respect to the axis about the subject. Each transmission line element includes an outer conductor and an inner conductor spaced radially from the outer conductor relative to the axis.
Abstract: In an ion implantation apparatus according to the present invention, ions are extracted from an ion source with the aid of extraction electrodes. The ions thus extracted are analyzed in mass by means of a mass analysis magnet apparatus and a mass analysis slit, so that the required ions are implanted in a substrate. Magnets for generating cusp magnetic fields are serially disposed along an ion beam line extending from the front part to the rear part of the mass analysis magnet apparatus.
Abstract: A solution polymerization process for the preparation of elastomeric ethylene propylene (diene) elastomers is characterized by the use of a) an unbridged catalyst having a cyclopentadienyl ligand and a monosubstituted nitrogen ligand; and b) a boron activator. High molecular weight elastomers may be inexpensively prepared by the process of this invention. The elastomers are suitable for the manufacture of rubber sheets or membranes and automotive parts such as seals, belts, hoses and tire sidewalls.
Abstract: A supported catalyst for the polymerization of olefins, especially ethylene, has at least two catalyst components having different propagation and/or termination constants. Each catalyst component must have at least one phosphinimine ligand. The polymer produced according to this invention has a broad molecular weight distribution. Catalysts according to this invention have a very surprising and desirable hydrogen response.
Type:
Grant
Filed:
April 16, 2001
Date of Patent:
November 26, 2002
Assignee:
Nova Chemicals (International) S.A
Inventors:
Ian McKay, Alison Ciupa, Barbara Christine Hall
Abstract: A new and distinct cultivar of Veronica prostrata plant characterized by a unique combination of gold foliage, violet-blue flowers, and sun tolerance.
Abstract: A new and distinct hybrid of Penstemon plant characterized by deep pink flowers on short, strong inflorescences and a compact, suffrutescent habit.
Abstract: A new and distinct hybrid of Tiarella plant characterized by its unique creeping habit with good vigor, fine leaf form and coloration, and showy white flowers.
Abstract: A new and distinct hybrid of Penstemon plant characterized by purple flowers on short, strong inflorescences and a compact, suffrutescent habit.
Abstract: A new and distinct hybrid of Pulmonaria plant characterized by a compact habit with short, ovate leaves of heavy substance and silvering, very light violet blue flowers, and excellent mildew resistance.