Unsaturated polyester resin compositions containing...

C - Chemistry – Metallurgy – 08 – L

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400/4007

C08L 67/06 (2006.01)

Patent

CA 2026636

23005A - 36 - UNSATURATED POLYESTER RESIN COMPOSITIONS CONTAINING COMPATIBLE COMPOUNDS ABSTRACT OF THE DISCLOSURE A sheet molding composition is disclosed which includes R four component resinous system which comprises (a) an unsaturated polyester comprising a polycondensation product of one or more dihydric alcohols and one or more ethylenically unsaturated polycarboxylic acids; (b) one or more low-profile additives which are thermoplastic polymers which cause phase separation and porosity during the curing reaction; (c) one or more olefinically unsaturated monomers which copolymerize with the unsaturated polyester; and, (d) one or more compatible components comprising at least one compound containing one or more polyoxyethane substituents. The compatible components remain compatible when the polyester and monomer cure and impart improved surface characteristics when added to low-profile resin systems.

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