发明名称 |
Synthetic polymer-propellant compositions forming cold foamed structures having a temperature at least 30 DEG C. below ambient temperature and containing open and/or closed cells |
摘要 |
Synthetic polymer-propellant compositions are provided that are capable of forming foamed structures having a temperature at least 30 DEG C. below ambient temperature and containing open and/or closed cells, which may optionally contain a material which is deposited in the pores and/or walls of the structure as the structure is formed, and comprising: (a) a film-forming synthetic polymer is an amount within the range from about 2% to about 30% by weight of the composition; (b) at least one liquefied propellant boiling below -10 DEG C; (c) the total propellant being in an amount within the range from about 50% to about 90% by weight of the composition; and having a heat of vaporization of at least 55 calories per gram; the propellant being capable of dissolving the synthetic polymer at least in the presence of a co-solvent that is soluble in the propellant and in solutions of the synthetic polymer in the propellant at ambient temperature; and (d) at least one nonsolvent that is soluble in the propellant solution but in which the synthetic polymer is insoluble in an amount within the range from about 1% to about 85% by weight of the composition; the composition forming upon volatilization of propellant at ambient temperature and pressure a foamed structure containing open and/or closed cells and having a temperature at least 30 DEG C. below ambient temperature.
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申请公布号 |
US4422877(A) |
申请公布日期 |
1983.12.27 |
申请号 |
US19820345833 |
申请日期 |
1982.02.04 |
申请人 |
RESTECH RESEARCH LIMITED PARTNERSHIP |
发明人 |
SPITZER, J. GEORGE;OSIPOW, LLOYD I. |
分类号 |
A61F7/10;C08J9/14;(IPC1-7):C08J9/14 |
主分类号 |
A61F7/10 |
代理机构 |
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代理人 |
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地址 |
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