Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1979-04-04
1981-09-29
Derrington, James H.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
2643286, 26432818, C08L 100
Patent
active
042922151
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 of fine powder. This mixture is optionally densified and granulated. The addition of urea and paraformaldehyde to the corn causes a low viscosity under cold manifold injection condition, which is particularly suited for cold manifold 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.degree.-110.degree. C. for over about 5 minutes and can be injected at applied pressures of below about 125 megapascals (18,000 psi) at such manifold temperatures with reasonable cycle times and without setting in the sprue or runners.
REFERENCES:
patent: 2841565 (1958-07-01), Bornstein
patent: 3230187 (1966-01-01), Oldham
patent: 3320192 (1967-05-01), Ostrowicz
patent: 3650821 (1972-03-01), Meiser
patent: 3681274 (1972-08-01), Oetgen et al.
Gore Donald B.
Krigbaum Ronald S.
Peterson James O.
Derrington James H.
Plaskon Products, Inc.
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