Amino molding compound for cold manifold injection molding

Details Amino molding compound for cold manifold injection molding Amino molding compound for cold manifold injection molding

C - Chemistry, Metallurgy

08

J

18/1213, 400/132

C08J 3/20 (2006.01) C08G 12/12 (2006.01) C08L 1/02 (2006.01) C08L 61/24 (2006.01)

Patent

CA 1110798

ABSTRACT A urea-formaldehyde corn is mixed or ground with added paraformaldehyde and urea in addition to a catalyst system and other conventional additives to produce a mixture or fine powder. This mixture is optionally densified and granulated. The additlon of urea and paraformaldehyde to the corn causes a low viscosity under cold manifold injec- tion condition, which is particularly suited for cold mani- fold molding applications. The condensation of resin in the corn is preferably kept low by using high formaldehyde: urea ratios and pH values during drying. The plastic life of the molding compound is improved by employing a catalyst system such as zinc sulfate and hexamethylenetetramine. The molding compound is stable at about 82-110°C for over about 5 minutes and can be injected at applied pressures of below about 125 megapascals (18,000 psi) at such manifold temper- atures with reasonable cycle times and without setting in the sprue or runners.

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