Highly active double metal cyanide complex catalysts suitable for use in ring-opening polymerization reactions may be prepared in filterable form by controlling the order of reagent addition, the temperature of the reaction medium, and the stoichiometric ratio of the reactants.

Process for preparing metal cyanide complex catalyst

This invention pertains to a method for immobilizing polyethylene oxide (PEO) star molecules in the form of hydrogels. The PEO star molecules are biocompatible and demonstrate non-thrombogenic properties. As such, the PEO star molecules have numerous uses for biomedical applications. The hydrogels contain a high percentage of terminal hydroxyl groups for attachment of affinity ligands and can be used for separating and purifying therapeutic proteins.

Immobilized polyethylene oxide star molecules for bioapplications

"Living" polymers and their preparation from acrylic-type or maleimide monomers and organosilicon, -tin or -germanium initiators.

"living" polymers and process for their preparation

A super-toughened multiphase thermoplastic composition is provided by combining at least one modified selectively hydrogenated conjugated diene/alkenyl arene block copolymer to which has been grafted an effective amount of succinic groups primarily in the selectively hydrogenated conjugated diene blocks thereof and optionally at least one unmodified selectively hydrogenated conjugated diene/alkenyl arene block copolymer with at least one α,ω-polyamide.

High impact resistant blends of thermoplastic polyamides and modified diblock copolymers

A butadiene polymer or a copolymer of butadiene with another conjugated diene having the following structural parameters and physical properties: (a) a content of butadiene moiety in the polymer or copolymer of at least 80% by weight, (b) a content of trans-1,4 linkage in the butadiene moiety of 80% to 95%, (c) a molecular weight distribution (Mw/Mn) of 1.2 to 4.0 as measured by gel permeation chromatography, (d) a melting temperature of the crystal of 40° C. to 130° C. as measured by DSC, and (e) a content of insolubles in boiling cyclohexane of 1% or less; a process for producing butadiene polymers, which comprises carrying out solution polymerization of butadiene monomer or budadiene monomer with another conjugated monomer in an inert solvent in the presence of a catalyst, which is a complex catalyst of (a) an organic acid salt of lanthanum or cerium and (b) an organic magnesium compound; and a polymeric resin material, comprising at least 30% by weight of a trans-butadiene polymer or copolymer as described above as a polymeric component. The above-described polymeric resin material is used as a golf ball cover material, a splint or gyps material, a head mold material for a wig, etc.

Crystalline trans-butadiene polymers

Solution polymers and rubbers can be prepared from monomers using a new catalyst complex of barium di-tert-alkoxide and a di-butyl magnesium compound. In particular, homopolymers and copolymers of butadiene with styrene, prepared with this catalyst, are uniquely characterized by the diene adducts having a low vinyl content (6-10 percent) and a high trans-1,4 structure (80-85 percent). Furthermore, the copolymer has a random comonomer sequence distribution. This molecular structure permits elastomers containing little or no styrene to have sufficient stereoregularity to crystallize.

Preparation of solution polymers using a barium di-tert alkoxide and a di-butyl magnesium catalyst complex

This invention relates to the preparation of solution polymers and rubbers from vinyl monomers using a new catalyst complex of a barium di-tert-alkoxide-hydroxide salt and an organic lithium compound In particular, homopolymers and copolymers of butadiene with styrene and/or isoprene, prepared with this catalyst, are uniquely characterized by the butadiene units having a low vinyl content (not over about 12%) and a trans-1,4 structure of from about 70 to 81% Also, the copolymer has a random comonomer sequence distribution This molecular structure permits elastomers containing little or no styrene to have sufficient stereoregularity to crystallize Furthermore, the butadiene homopolymer and copolymer with styrene and/or isoprene exhibit a broad molecular weight distribution as well as tack and green-strength which are valuable properties for a rubber to possess when building tires

Preparation of solution polymers

This invention relates to the preparation of solution polymers and rubbers from vinyl monomers using a new catalyst complex of a barium di-tert-alkoxide-hydroxide salt and ann organic lithium compound. In particular, homopolymers and copolymers of butadiene with styrene and/or isoprene, prepared with this catalyst, are uniquely characterized by the butadiene units having a low vinyl content (not over about 12%) and a trans-1,4 structure of from about 70 to 81%. Also, the copolymer has a random comonomer sequence distribution. This molecular structure permits elastomers containing little or no styrene to have sufficient stereoregularity to crystallize. Furthermore, the butadiene homopolymer and copolymer with styrene and/or isoprene exhibit a broad molecular weight distribution as well as tack and green-strength which are valuable properties for a rubber to possess when building tires.

Composition useful in anionic polymerization

This invention relates to the preparation of solution polymers and rubbers from vinyl monomers using a new catalyst complex of a barium di-tert-alkoxide-hydroxide salt and an organic lithium compound. In particular, homopolymers and copolymers of butadiene with styrene and/or isoprene, prepared with this catalyst, are uniquely characterized by the butadiene units having a low vinyl content (not over about 12%) and a trans-1,4 structure of from about 70 to 81%. Also, the copolymer has a random comonomer sequence distribution. This molecular structure permits elastomers containing little or no styrene to have sufficient stereoregularity to crystallize. Furthermore, the butadiene homopolymer and copolymer with styrene and/or isoprene exhibit a broad molecular weight distribution as well as tack and green-strength which are valuable properties for a rubber to possess when building tires.

Alkaline barium alcoholates

Of The Disclosure Divinyl benzene and/or diisopropenyl benzene in hydrocarbon solvent is added over a period of time at low temperature to hydrocarbon solvent containing a C2-20 normal, secondary or tertiary alkyl or cycloalkyl lithium compound and a tertiary alkylamine having 2-4 carbon atoms prepared at low temperature to provide an initiator having an average of from 4 to 9 C-Li sites and a VPO ?n of from about 750 to 4,000. These initiators are useful in polymerizing dienes and vinyl monomers to provide star polymers having an average of from about 4 to 9 arms or branches. These star polymers among other things are useful low profile or low shrink additives for FRPs, e.g., glass fiber reinforced plastics.

Ivan Glen Hargis

Papers

Preparation of solution polymers using a barium di-tert alkoxide and a di-butyl magnesium catalyst complex

Preparation of solution polymers

Composition useful in anionic polymerization

Alkaline barium alcoholates

Preparation of star polymers