# US 2013/0158291 A1 · Process for preparing polyurethane prepolymers containing isocyanate groups

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- Number: US 2013/0158291 A1
- Document ID: US20130158291A1
- Status: Published application
- Kind: A1
- Application number: 13/809,639
- Filed: 2011-07-11
- Published: 2013-06-20
- Earliest claimed: 2010-07-13
- Assignees: Bayer Intellectual Property GmbH
- Inventors: Hans-Georg Pirkl; Manfred Schmidt; Robert Vieler; Ursula Tracht; Peter Weuta; Sigurd Buchholz
- Web page: https://patentgrep.com/patent/US20130158291A1

## CPC

- C07C 263/16: by reactions not involving the formation of isocyanate groups
- B29B 7/7404: {Mixing devices specially adapted for foamable substances (B29B7/76 takes precedence)}
- B29B 7/7663: {the mixing head having an outlet tube with a reciprocating plunger, e.g. with the jets impinging in the tube}
- C08G 18/0895: {Manufacture of polymers by continuous processes (C08G18/0838 takes precedence)}
- C08G 18/10: Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

The present invention relates to the technical field of isocyanates. The present invention provides a method for preparing NCO prepolymers by reacting a stoichiometric excess of an organic isocyanate with an isocyanate-reactive component, the reaction components being mixed together and the mixture being introduced directly into a storage or transport vessel, where it reacts to completion.

## Claims

### Claim at position 1

1-11. (canceled)

### Claim 12

A method for preparing an isocyanate group-containing prepolymer from an isocyanate group-containing component and an isocyanate group-reactive component, which comprises
mixing continuously the components in a mixing device and immediately after being mixed
introducing continuously the reaction mixture into a storage or transport vessel, where the reaction between the components is completed.

### Claim 13 (depends on 12)

The method according to claim 12, wherein the storage or transport vessel has no means of mixing and/or cooling.

### Claim 14 (depends on 12)

The method according to claim 12, wherein the transport vessel is the tank of a tanker vehicle.

### Claim 15 (depends on 12)

The method according to claim 12, wherein the temperature in the vessel rises less than 60° C.

### Claim 16 (depends on 12)

The method according to claim 12, wherein the proportion of isocyanate group-reactive component in the mixture is 0.1 to 10 weight %.

### Claim 17 (depends on 12)

The method according to claim 12, wherein the mixing device comprises one or more static mixers.

### Claim 18 (depends on 12)

The method according to claim 12, wherein in a first step of a batch production only a first reaction component is initially directed through the mixing device into the vessel, before in a second step the second reaction component is directed into the mixing device in addition to the first reaction component, where it is mixed with the first reaction component.

### Claim 19 (depends on 18)

The method according to claim 18, wherein the reaction component directed through the mixing device in the first step of the batch production is the isocyanate group-containing component and the reaction component directed into the mixing device in the second step is the isocyanate group-reactive component.

### Claim 20 (depends on 18)

The method according to claim 18, wherein to end the batch production the metering of the second reaction component is stopped and the mixing device is rinsed with the first reaction component.

### Claim 21 (depends on 20)

The method according to claim 20, wherein after the end of the batch production the mixing device remains in the flooded state at ambient temperature until the start of the next batch production.