Macromonomers and methods for making polymer polyols
A technology of macromonomers and polyols, which is applied in the field of manufacturing dispersions of polymer particles in polyols, which can solve problems such as poor performance, splitting, and uneven density of foam structures
Active Publication Date: 2019-04-19
DOW GLOBAL TECH LLC
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Problems solved by technology
The result is that the foam exhibits severe cosmetic and / or structural defects such as uneven density throughout the foam structure, rough uneven surfaces and even splitting
[0009] The third problem occurs when the foam is colored, which is a common situation
Certain pigments that were otherwise perfectly satisfactory have been found to perform poorly in the production of polymer polyols using this macromer
Method used
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[0070] A. Production of macromonomers
[0071] Potassium hydroxide was added to a sorbitol initiated poly(propylene oxide) starting polyol having a molecular weight of about 700. Sufficient potassium hydroxide was added to provide about 2100 ppm KOH in the final 12,000 molecular weight product. The starting polyol corresponds to the reaction product of sorbitol and about 2 moles of propylene oxide / hydroxyl. An 88 / 12 mixture of propylene oxide and ethylene oxide was added and polymerized at a temperature of 105°C to produce a hexafunctional polyol in which propylene oxide and ethylene oxide polymerized randomly. The final ratio of propylene oxide to ethylene oxide was about 88.5:11.5 by weight. The final hydroxyl number was 30.1, which corresponds to 1864 hydroxyl equivalent weight and about 11,200 molecular weight. After processing and addition of 250 ppm antioxidant, 500 parts of this copolymer were heated to 55° C. with stirring and 0.55 moles of TMI (per mole of copolyme...
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Abstract
The present invention relates to a polymer polyol produced by polymerizing ethylenically unsaturated monomers in a continuous polyol phase. The polymerization is stabilized with a macromer or a pre-formed polymer made by polymerizing or copolymerizing the macromer. The macromer is a random polymer of propylene oxide and ethylene oxide in defined ratios, which also contains polymerized carbon-carbon double or triple bonds. The polymer polyols produced in the process exhibit minimal viscosity rise when mixed with water. The flexible polyurethane foam produced from the polymer polyol exhibits excellent hardness, has good surface characteristics and exhibits good, uniform coloration when colored.
Description
technical field [0001] The present invention relates to a process for the manufacture of dispersions of polymer particles in polyols. Background technique [0002] "Polymer polyols" (sometimes referred to as "copolymer polyols") are widely used raw materials for the manufacture of flexible polyurethane foam and other polyurethane products. It has a continuous phase consisting of one or more compounds with multiple hydroxyl groups (ie "polyol") into which another polymer is dispersed in the form of small particles. Dispersed polymer particles help to form open cells and increase the load bearing of polyurethane foams made with polymer polyols. [0003] The conventional way of making polymer polyols is by polymerizing the dispersed phase polymer directly within the continuous polyol phase ("in situ" polymerization). It is also possible to manufacture polymer polyols in a mechanical dispersion process, in which preformed polymer is melted and then mechanically dispersed into ...
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IPC IPC(8): C08G18/63C08G18/40
CPCC08G18/4072C08G18/632C08G18/636C08G18/7614C08J2425/12C08J2375/08C08G2650/58C08G2110/0083C08G2110/005C08G2110/0008C08J9/0061C08J9/12C08L25/12
Inventor R·B·布雷拉S·克劳塞斯J-P·梅西S·德卢斯
Owner DOW GLOBAL TECH LLC