发明授权
- 专利标题： Phenol-formaldehyde novolac resin having low concentration of free phenol
- 专利标题（中）： 具有低浓度游离酚的酚醛酚醛清漆树脂
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申请号： US11747343申请日： 2007-05-11
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公开(公告)号： US09458349B2公开(公告)日： 2016-10-04
- 发明人: Richard Rediger , Edward Lucas
- 申请人： Richard Rediger , Edward Lucas
- 申请人地址： US GA Atlanta
- 专利权人： Georgia-Pacific Chemicals LLC
- 当前专利权人： Georgia-Pacific Chemicals LLC
- 当前专利权人地址： US GA Atlanta
- 代理商 Ram W. Sabnis
- 主分类号： C09D161/00
- IPC分类号： C09D161/00 ; C09D161/06 ; B22C1/22 ; C08G8/10 ; C08L59/00 ; C09D159/00
摘要：
A phenol-formaldehyde novolac resin having a low concentration of free phenol prepared by distilling residual phenol from a molten novolac resin and replacing at least a portion of the phenol with a solvent having a volatility equal to or less than phenol. Such modified novolac resins are suitable for the production of resin coated molding sands for shell molding and sand cores, as well as for the production of resin coated proppants for use in oil and gas recovery operations.