Patent · US Active

Stable phenolic resin polymer dispersions having low free aldehyde content

US7671097B2 · kind B2 · utility

2Cited by
23References
21Claims
0Family size

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Key dates

Filing dateMay 24, 2005
Grant dateMar 2, 2010
Priority date—
Expiry dateJul 21, 2027

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10S516/928
  • WIPO fieldMacromolecular chemistry, polymers
  • WIPO sectorChemistry

Abstract

Stable dispersions of phenolic resins, particularly bisphenol-A/formaldehyde resins, for use in e.g., baking enamels, coatings, adhesives, binders, etc., are disclosed. The dispersions have low levels (e.g., <0.1% by weight) of free aldehyde, thereby reducing environmental harms associated with aldehyde emissions. Low free aldehyde levels are achieved using melamine as an aldehyde scavenger during preparation. It has now been discovered that melamine, in contrast to other scavengers of aldehydes, does not adversely affect dispersion stability, interfere with later processing operations, or negatively impact the final resin product quality (e.g., after curing).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.