PROCESS FOR PRODUCING A LOW DENSITY FREE-RISE POLYURETHANE FOAM

    公开(公告)号:US20220081505A1

    公开(公告)日:2022-03-17

    申请号:US17538561

    申请日:2021-11-30

    Abstract: There is described a process for producing a free-rise polyurethane foam having a density of less than or equal to about 0.75 pcf. the process comprises the steps of: (a) contacting: (i) an isocyanate, (ii) a first polyol comprising a first polymer chain consisting essentially of propylene oxide units and alkylene oxide units selected from ethylene oxide, butylene oxide and mixtures thereof in a weight ratio of propylene oxide units to alkylene oxide units in the range of from about 90:10 to about 25:75, the polymer chain being terminally capped with the ethylene oxide units, the first polyol having a primary hydroxyl content of at least about 70% based on the total hydroxyl content of the first polyol, (iii) water (iv) a surfactant and (v) a catalyst to form a foamable reaction mixture; and (b) expanding the foamable reaction mixture to produce the free-rise polyurethane foam.

    Process for producing a low density free-rise polyurethane foam

    公开(公告)号:US11214647B2

    公开(公告)日:2022-01-04

    申请号:US16397373

    申请日:2019-04-29

    Abstract: There is described a process for producing a free-rise polyurethane foam having a density of less than or equal to about 0.75 pcf. the process comprises the steps of: (a) contacting: (i) an isocyanate, (ii) a first polyol comprising a first polymer chain consisting essentially of propylene oxide units and alkylene oxide units selected from ethylene oxide, butylene oxide and mixtures thereof in a weight ratio of propylene oxide units to alkylene oxide units in the range of from about 90:10 to about 25:75, the polymer chain being terminally capped with the ethylene oxide units, the first polyol having a primary hydroxyl content of at least about 70% based on the total hydroxyl content of the first polyol, (iii) water (iv) a surfactant and (v) a catalyst to form a foamable reaction mixture; and (b) expanding the foamable reaction mixture to produce the free-rise polyurethane foam.

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