Method of reducing a content of a residual styrene monomer...

Details Method of reducing a content of a residual styrene monomer... Method of reducing a content of a residual styrene monomer...

2004-11-10

2009-10-20

Cheung, William K (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S230500, C526S310000, C526S341000, C526S346000

Reexamination Certificate

active

07605216

ABSTRACT:
A method of reducing a content of a residual styrene monomer in a polyol utilizes a polyol, a peroxide, an adjustment of temperature, and an application of a vacuum to separate the residual styrene monomer from the polyol. The residual styrene monomer is classified as a volatile organic compound. The peroxide includes monoperoxycarbonates and peroxyketals. Peroxide radicals, present in the peroxide, react with and polymerize the residual styrene monomer to form a polymer having decreased volatility. Applying the vacuum physically separates the residual styrene monomer from the polyol by increasing a vapor pressure of the residual styrene monomer. Separating the residual styrene monomer from the polyol forms an improved polyol which includes less than 20 parts per million of the residual styrene monomer in the polyol.

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patent: 2001-294633 (2001-10-01), None
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European Search Report for EP 1657273 A1, dated Feb. 8, 2006, 2 pages.
English language translation and abstract for JP 2001-294633, 15 pages, Feb. 7, 2008.

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