Tertiary ethers as blowing agents for foam polymer systems
First Claim
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1. In a process for foaming polymers and copolymers by impregnating polymer particles with a blowing agent, preexpanding the particles by heating above the glass transition temperature of the impregnated polymer, placing the particles in a mold and heating to fully expand to a molded article, the improvement comprising using as blowing agent a tertiary ether selected from the group consisting of methyl tert-butyl ether, methyl tert-amyl ether, ethyl tert-butyl ether, and mixtures of these with hydrocarbon blowing agents having from 4 to 6 carbon atoms in the molecule.
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Abstract
The use of tertiary ethers as blowing agent allows the preparation of lower density foams from many types of polymeric materials.
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Citations
10 Claims
- 1. In a process for foaming polymers and copolymers by impregnating polymer particles with a blowing agent, preexpanding the particles by heating above the glass transition temperature of the impregnated polymer, placing the particles in a mold and heating to fully expand to a molded article, the improvement comprising using as blowing agent a tertiary ether selected from the group consisting of methyl tert-butyl ether, methyl tert-amyl ether, ethyl tert-butyl ether, and mixtures of these with hydrocarbon blowing agents having from 4 to 6 carbon atoms in the molecule.
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Current AssigneeARCO Chemical Technology, Inc. (Lyondellbasell Industries NV)
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Original AssigneeARCO Chemical Technology, Inc. (Lyondellbasell Industries NV)
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InventorsVerdol, Joseph A., Sonnenberg, Fred M.
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Primary Examiner(s)Foelak, Morton
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Application NumberUS07/620,869Time in Patent Office386 DaysField of Search521/88, 521/114, 521/143, 521/146, 521/150, 521/56, 521/60, 521/79, 521/81, 521/910, 264/DIG. 5US Class Current521/60CPC Class CodesC08J 9/142 Compounds containing oxygen...C08J 9/149 Mixtures of blowing agents ...Y10S 264/05 Use of one or more blowing ...Y10S 521/91 Plural blowing agents for p...
