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    PRODUCTION OF ELASTIC POLYURETHANE SLABSTOCK FOAM
    1.
    发明专利
    PRODUCTION OF ELASTIC POLYURETHANE SLABSTOCK FOAM 失效

    公开(公告)号：JPH1067842A

    公开(公告)日：1998-03-10

    申请号：JP14987097

    申请日：1997-05-26

    Applicant: BAYER AG

    Inventor： ILLGER HANS-WALTER DR ,  HAAS PETER DR ,  EIBEN ROBERT DR

    IPC: C08J9/02 ,  C08G18/00 ,  C08G18/08 ,  C08G18/12 ,  C08G18/48 ,  C08G101/00 ,  C08J9/08 ,  C08J9/12 ,  C08L75/04

    Abstract: PROBLEM TO BE SOLVED: To provide an elastic flexible polyurethane slabstock foam having properties (density, hardness and elasticity) equivalent to or better than those of a foam material made by using a common physical blowing agent by using carbon dioxide as the blowing agent. SOLUTION: A polyisocyanate is reacted with at least one polyol having a molecular weight of 2,000-10,000, a functionality of 2-4 and at least two hydrogen atoms reactive with the polyisocyanate, at least one polyol having a molecular weight of 400-4,000, a functionality of 4-8 and at least four hydrogen atoms reactive with the isocyanate, water, optional adjuvants such as an organic blowing agent, a stabilizer, an activator, additives and assistants, optionally a low-molecular-weight crosslinking agent having a molecular weight of 32-399, and liquid carbon dioxide used as an additional blowing agent and depressurized in a vacuum chamber containing a fine-mesh grating upstream of the point of release on the belt conveyor.

    Process for the production of flexible slabstock polyurethane foams
    2.
    发明专利
    Process for the production of flexible slabstock polyurethane foams 未知

    公开(公告)号：SI0810256T1

    公开(公告)日：2004-02-29

    申请号：SI9730591

    申请日：1997-05-15

    Applicant: BAYER AG

    Inventor： ILLGER HANS-WALTER DR ,  HAAS PETER DR ,  EIBEN ROBERT DR

    IPC: C08J9/02 ,  C08G18/00 ,  C08G18/08 ,  C08G18/12 ,  C08G18/48 ,  C08G101/00 ,  C08J9/08 ,  C08J9/12 ,  C08L75/04

    Abstract: A method for the preparation of elastic block soft foam materials comprises reacting the following components together :(A) polyisocyanates ; (B) polyol compounds with a molecular weight of 400-10000 containing at least two hydrogen atoms that can react with (A) ; (C) water and optional organic propellants ; (D) standard stabilisers ; (E) standard activators ; and (F) other standard auxiliary agents and additives. (B) comprise : (B1) compounds with a molecular weight of 2000-10000, functionality of 2-4 and containing at least two hydrogen atoms that can react with (A) ; (B2) compounds with a molecular weight of 400-4000 (500-3000), functionality of 4-8 (4-6) and containing at least four hydrogen atoms that can react with (A) ; and (B3) optional cross-linking agents with a molecular weight of 32-399. Liquid carbon dioxide (G) is used as an extra propellant in the preparation of the foam and depressurised in a decompression chamber containing a fine mesh before the foam is dispensed.

    4.
    发明专利
    未知

    公开(公告)号：DE4446876A1

    公开(公告)日：1996-07-04

    申请号：DE4446876

    申请日：1994-12-27

    Applicant: BAYER AG ,  HENNECKE GMBH MASCHF

    Inventor： SULZBACH HANS-MICHAEL DIPL ING ,  ALTHAUSEN FERDINAND ,  STEILEN HERBERT ,  RAFFEL REINER DIPL ING ,  EIBEN ROBERT DR ,  EBELING WILFRIED DIPL ING

    IPC: C08J9/12 ,  B29C44/00 ,  B29C44/34 ,  B29C44/46 ,  B29K75/00 ,  B29C67/20

    Abstract: Producing foam from a liq. contg. gas dissolved under pressure, by expanding the liq. to a pressure below the satn. pressure of the gas and releasing the gas. The process comprises forcing the liq. through an extended flow channel so that the pressure is reduced against the flow resistance and a high shear rate is generated, and then reducing the rate of flow to 1/10-1/500 of its original value before the liq. foams. Also claimed is an appts. for this process, comprising a housing (2) contg. a long flow channel (4) with a small cross-section in at least one dimension, a distribution chamber (5) for the pressurised liq. over the opening(s) of the flow channel, a feed pipe (7) for the distribution channel (5) and a means (6) of reducing the speed of the liq. after the outlet end (15) of the flow channel (4). Pref. used esp. for the prodn. of foam from 2-component reactive plastics with CO2 as blowing agent, the process comprises mixing at least one of the components with CO2 under pressure, mixing the components, expending the CO2-contg. mixt. and hardening the foam obtd.. The liq. or reactive mixt. passes through the flow channel in less than 10 2 secs., and the shear rate produced in the channel is at least 10 4/sec.. The flow channel is in the form of a conical ring channel with an inner cone which can be moved axially to narrow the channel. The ratio between the length of the flow channel in the direction of flow and its small cross-sectional dimension is 30-300.

    6.
    发明专利
    未知

    公开(公告)号：DE19627065A1

    公开(公告)日：1998-01-08

    申请号：DE19627065

    申请日：1996-07-05

    Applicant: HENNECKE GMBH ,  BAYER AG

    Inventor： SULZBACH HANS-MICHAEL DIPL ING ,  ALTHAUSEN FERDINAND ,  RAFFEL REINER DIPL ING ,  EIBEN ROBERT DR ,  EBELING WILFRIED DIPL ING

    IPC: B29C44/34 ,  B29C44/46 ,  C08J9/12 ,  C08L75/04 ,  B29B7/76 ,  B29C44/20

    Abstract: A process and device for the continuous production of slabstock foam by foaming a polyurethane reactive mixture containing carbon dioxide dissolved under pressure, comprising the steps of a) feeding said polyurethane reactive mixture into a linear extended pressure distribution chamber at a pressure above that of the solubility vapor pressure of said dissolved carbon dioxide, b) reducing pressure to a pressure below said solubility vapor pressure of said dissolved carbon dioxide in a linear extended pressure reduction zone, c) feeding said polyurethane reactive mixture from said pressure reduction zone into a foaming chamber with a widening cross-section of flow to form a foamed reactive mixture, and d) applying said foamed reactive mixture (froth) substantially perpendicularly and free-flowing onto a conveyer belt of a continuous slabstock foam plant.

    8.
    发明专利
    未知

    公开(公告)号：DE19621305A1

    公开(公告)日：1997-12-04

    申请号：DE19621305

    申请日：1996-05-28

    Applicant: BAYER AG

    Inventor： ILLGER HANS-WALTER DR ,  HAAS PETER DR ,  EIBEN ROBERT DR

    IPC: C08J9/02 ,  C08G18/00 ,  C08G18/08 ,  C08G18/12 ,  C08G18/48 ,  C08G101/00 ,  C08J9/08 ,  C08J9/12 ,  C08L75/04 ,  C08L71/00

    Abstract: A method for the preparation of elastic block soft foam materials comprises reacting the following components together :(A) polyisocyanates ; (B) polyol compounds with a molecular weight of 400-10000 containing at least two hydrogen atoms that can react with (A) ; (C) water and optional organic propellants ; (D) standard stabilisers ; (E) standard activators ; and (F) other standard auxiliary agents and additives. (B) comprise : (B1) compounds with a molecular weight of 2000-10000, functionality of 2-4 and containing at least two hydrogen atoms that can react with (A) ; (B2) compounds with a molecular weight of 400-4000 (500-3000), functionality of 4-8 (4-6) and containing at least four hydrogen atoms that can react with (A) ; and (B3) optional cross-linking agents with a molecular weight of 32-399. Liquid carbon dioxide (G) is used as an extra propellant in the preparation of the foam and depressurised in a decompression chamber containing a fine mesh before the foam is dispensed.

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