C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
18/1167, 400/572
C08K 3/22 (2006.01) C08L 67/06 (2006.01)
Patent
CA 1197033
ABSTRACT OF THE DISCLOSURE A method of preparing amorphous curable solid polyester resin pellets and powders which are suitable for use in injection, compression or transfer molding operations comprising: (a) preparing a mixture consisting essentially of an unsaturated polyester resin in a melted state and up to 5% by weight, based on the weight of the polyester resin, of an alkaline earth metal oxide or hydroxide, with the pro- viso that the alkaline earth metal oxide or hydroxide be added in an amount effective to provide a viscosity for the mixture characterized by a plateau region in the viscoelastic spectrum for the mixture; (b) heating the fluid mixture until the oxide or hydroxide is reacted and a desired increase in viscosity characterized by a plateau region in the visco- elastic spectrum of the mixture is attained; then (c) dis- persing into the mixture obtained in step (b) with high shear mixing an unsaturated polymerizable monomer containing a terminal ethylene group, an organic peroxide initiator and a filler, fibrous reinforcing material, pigment or mold re- lease agent, or mixtures thereof while maintaining the tem- perature of the mixture below the decomposition temperature of the peroxide initiator; and (d) extruding the mixture obtained in step (c) to form dry, free-flowing pellets or powders.
430088
Macrae & Co.
Premix Inc.
LandOfFree
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