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US09133295B2 Preparation of phenol-formaldehyde resin beads using suspension or emulsion polymerization 有权
使用悬浮液或乳液聚合制备酚醛树脂珠

Preparation of phenol-formaldehyde resin beads using suspension or emulsion polymerization
Abstract:
Methods for making polymer particles in gel form via an emulsion and/or suspension polymerization are provided. In at least one specific embodiment, the method can include reacting a first reaction mixture comprising a phenolic monomer, an aldehyde monomer, and a first catalyst to produce a prepolymer. The method can also include combining the prepolymer with a carrier fluid and a second catalyst to produce a second reaction mixture. The second catalyst can include a dicarboxylic acid, an anhydride, a dihydroxybenzene, or any mixture thereof. The method can also include polymerizing the prepolymer to form polymer particles in gel form.
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