Method of warm runner injection molding phenolic resins with par

Details Method of warm runner injection molding phenolic resins with par Method of warm runner injection molding phenolic resins with par

1974-09-06

1976-05-25

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

260 334P, 264329, B29G 300

Patent

active

039594335

ABSTRACT:
There is disclosed a thermosetting phenolic resin composition, suitable for use in injection molding, which resin composition contains a molding grade phenolic resin and an effective amount of a reactive compound (e.g., para-t-butylphenol) that is capable of reducing the viscosity of molding compositions containing said phenolic resin composition to a processable viscosity at a temperature at which the period of time within which said molding composition cures to a thermoset state is longer than the period of time that said molding composition is in the runner during a normal injection molding operation. There is also disclosed molding compositions containing said phenolic resin composition, and an injection molding process utilizing the same.

REFERENCES:
patent: 2736718 (1956-02-01), Webber
patent: 2809178 (1957-10-01), Turner et al.
patent: 2970121 (1961-01-01), Schmittberger
patent: 3299167 (1967-01-01), Knowlson et al.
patent: 3351605 (1967-11-01), Harvey
patent: 3660552 (1972-05-01), Hinz et al.
patent: 3812228 (1974-05-01), Skoroszewski
Randolph et al., Plastics Engineering Handbook, Reinhold, N.Y. (1965) pp. 36 and 37.

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