Filler for polyester molding compound and method

Details Filler for polyester molding compound and method Filler for polyester molding compound and method

C - Chemistry, Metallurgy

08

K

6/216, 400/7627

C08K 3/26 (2006.01) C09C 1/02 (2006.01)

Patent

CA 2036597

An improved dry ground calcium carbonate filler is provided which is less sensitive to variations in relative humidity and does not promote premature viscosity increase in polyester molding compound. This filler is dry ground from a Caribbean micritic limestone to produce Class I and Class II fillers which are acceptable for use in polyester molding compound applications. A polyester molding compound containing this dry ground filler produces a composite having superior izod impact resistance and surface quality. In some situations filler loading levels may be increased 10 - 15% in the SMC/BMC without detrimental effects on the final composite.

Charge améliorée de carbonate de calcium broyée à sec, moins sensible aux variations d'humidité relative et ne favorisant pas une augmentation prématurée de la viscosité des mélanges à mouler de polyester. Cette charge est broyée à sec à partir de calcaire microgranulaire des Caraïbes, afin de produire des charges de catégories I et II qui soient acceptables pour des applications de mélanges à mouler de polyester. Un mélange à mouler de polyester contenant cette charge broyée à sec permet de produire un composite ayant une résistance aux impacts Izod et une qualité du surface supérieures. Dans certaines situations, les niveaux de charge peuvent être augmentés de 10 à 15 % dans le SMC-BMC, sans répercussions nuisibles sur le composite final.

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