Covestro LLC

Covestro Deutschland Ag

Bayer Materialscience, LLC

Adhesys Medical Gmbh

Bayer Intellectual Property Gmbh

Edward P Browne

Jack R Reese

Jose F Pazos

Jörg Hofmann

Klaus Lorenz

Yue Yang

Hartmut Nefzger

Heike Heckroth

Brian L Neal

Christoph Eggert

Anthony R Loveday

Steven J Rodberg

Rick L Adkins

Stanley L Hager

Don S Wardius

Micah N Moore

Christian Steinlein

Horst Zwick

Jenna L Caputo

William E Wood

Phillip E Bowles

Processes are described for producing an aromatic diamine-initiated polyether polyol having a measured OH number of 300 to 500 mg KOH/g and a viscosity at 25&#xb0; C. of 5000 to 50,000 mPas. The processes include a first alkoxylation step in which an alkylene oxide consisting essentially of propylene oxide is reacted with a starter consisting essentially of aromatic diamine at a molar ratio of propylene oxide to aromatic diamine of 1.4:1 to 2.0:1 to form an alkoxylated product; and a second alkoxylation step in which an alkylene oxide consisting essentially of propylene oxide is reacted with the alkoxylated product, in the presence of an added catalyst, until the ratio of moles of propylene oxide added in the process to the moles of aromatic diamine added in the process is 4:1 to 9:1.

Processes for producing aromatic diamine-initiated polyether polyols

This invention relates to an improved process for the preparation of a high molecular weight polyoxyalkylene polyether polyol by the continuous addition of starter (CAOS) process. This process enables a shorter cycle time while maintaining a low viscosity in high molecular weight polyoxyalkylene polyether polyols.

Process for preparing polyoxyalkylene polyols by the continuous addition of starter

The present invention provides long chain, active polyether polyols which are characterized by a functionality of 2 to 6 and an equivalent weight of 1000 to 2200 Da. These long chain polyethers comprise the alkoxylation product of (1) a starter composition having an equivalent weight of 350 Da or less, with (2) one or more alkylene oxides, in which up to 20% of ethylene oxide may be added as a cap, in the presence of (3) at least one basic catalyst. Suitable starter compositions (1) comprise the alkoxylation product of (a) a low molecular weight polyether having a functionality of 3 and an equivalent weight of less than 350 Da, (b) at least one low molecular weight starter compound comprising glycerin, and (c) propylene oxide or a mixture of propylene oxide and ethylene oxide, in the presence of (d) at least one double metal cyanide catalyst. A process for preparing these long chain polyether polyols is also disclosed.

Base-catalyzed, long-chain, active polyethers from short chain DMC-catalyzed starters

This invention relates to process for preparing low viscosity polyoxyalkylene polyols (P) that have a narrow molecular weight distribution. This process comprises reacting a H-functional starter substance (S), a H-functional starter substance (S) and a H-functional starter substance (S) with one or more alkylene oxides in the presence of a double metal cyanide catalyst. The resultant polyoxyalkylene polyols (P) have a functionality of 2 to 8 and a hydroxyl number of greater than 35 to 115 mg KOH/g polyol.

Product-to-product process for preparation of low viscosity polyoxyalkylene polyols

This invention relates to a semi-batch process for preparing low viscosity polyoxyalkylene polyether polyols (P) that have a narrow molecular weight distribution. This process comprises reacting a H-functional starter substance (S), a H-functional starter substance (S) and a H-functional starter substance (S) with one or more alkylene oxides in the presence of a double metal cyanide (DMC) catalyst. The resultant polyoxyalkylene polyols (P) have a functionality of 2 to 8 and a hydroxyl number of 5 to 35 mg KOH/g polyol. In addition, the polyoxyalkylation can be completed with a low continuous addition of starter (CAOS) cap.

Product-to-product process for preparation of low viscosity polyoxyalkylene polyether polyols

This invention relates to a process for preparing low viscosity polyoxyalkylene polyols (P) that have a narrow molecular weight distribution. This process comprises reacting a H-functional starter substance (S), a H-functional starter substance (S) and a H-functional starter substance (S) with one or more alkylene oxides in the presence of a double metal cyanide catalyst. The resultant polyoxyalkylene polyols (P) have a functionality of 2 to 8 and a hydroxyl number of 5 to 35 mg KOH/g polyol.

This invention relates to a semi-batch process for the production of polyoxyalkylene polyether polyols. These polyoxyalkylene polyether polyols have hydroxyl (OH) numbers of from 112 to 400. This process comprises establishing oxyalkylation condition in a reactor in the presence of a DMC catalyst, continuously introducing alkylene oxide and a suitable starter into the reactor, and recovering an oxyalkyated polyether polyol. The oxyalkylation initially occurs at a temperature that is sufficiently high enough to avoid or prevent deactivation of the DMC catalyst, or for from 2% to 50% of the total oxide feed amount, and the oxyalkylation is then continued at a lower temperature.

Method to increase the resistance of double metal cyanide catalysts to deactivation

This invention relates to a process for preparing a stable low viscosity polymer polyol having a solids content of at least about 30% by weight. This process comprise free-radically polymerizing one or more base polyols, one or more pre-formed stabilizers, and one or more ethylenically unsaturated monomers in the presence of one or more free-radical polymerization initiators, and one or more polymer control agents; in which the process is restarted after being stopped by (I) restarting the feed of base polyol and the initiator; (II) continuing the base polyol and initiator feed until the total feed amounts to at least 5% of the total reactor volume; and (III) restarting the feed of the ethylenically unsaturated monomers in which the ratio of monomers to total feed is ramped up to its final value over a period of not less than 25% of the reactor residence time. This process is particularly suitable for restarting the process of production after any planned or unplanned reactor shutdown.

Polymer polyol quality

This invention relates to a semi-batch process for producing low molecular weight polyoxyalkylene polyols. These polyoxyalkylene polyols are characterized by hydroxyl numbers of from 200 to 500. In accordance with the invention, the first alkylene oxide block used to activate the DMC catalyst comprises from 50% to 100% by weight of propylene oxide and from 0% to 50% by weight of ethylene oxide; and the second alkylene oxide block comprises from 50% to 100% by weight of propylene oxide and from 0% to 50% by weight of ethylene oxide. A continuously added starter is present. Optionally, a third alkylene oxide block can be added. The addition of the second alkylene oxide block and of the third alkylene oxide block when present is completed with a space time yield of greater than or equal to 250 kg/m/hr.

Process for the production of low molecular weight polyoxyalkylene polyols

The present invention relates to a process for producing a hydroxy amino polymer comprising the steps:

Hydroxy amino polymer and use thereof in polyurea/polyurethane tissue adhesives

The invention relates to a process for the preparation of polyether polyols with equivalent molecular weights of from 8,000 to 20,000 g/mol from one or more H-functional starter compounds and one or more alkylene oxides in the presence of a double metal cyanide catalyst, characterized in that the alkylene oxides are metered into the reactor in the course of from 15 to 23 h.

Process for preparing high molecular weight polyether polyols

Base-catalyzed, long chain, active polyethers from short chain DMC-catalyzed starters

The present invention provides flexible conventional polyurethane foams made from at least one polyisocyanate and at least one vegetable oil alkoxylated in the presence of a double metal cyanide (DMC) catalyst, optionally at least one non-vegetable oil-based polyol, generally in the presence of a blowing agent and optionally in the presence of a surfactant, pigment, flame retardant, catalyst or filler. The alkoxylated natural oil must have (a) an ethylene oxide content in the alkoxylated segment greater than 20% by weight, (b) a primary hydroxyl group content of at least 10%, with the sum of (a)+(b) being at least 30% but no greater than 60%, The alkoxylated natural oils are environmentally-friendly, bio-based polyols which can be used to increase the 'green' content of polyurethane foams without having detrimental effects on foam properties.

Growing community of inventors

Cologne, Germany

Edward P Browne