Reaction injection molded article with threads and method of mol

Details Reaction injection molded article with threads and method of mol Reaction injection molded article with threads and method of mol

1982-03-08

1984-05-01

Thomas, Alexander

Stock material or miscellaneous articles

Nonparticulate element embedded or inlaid in substrate and...

428158, 428162, 428218, 428219, 4283188, 523099, 411178, 411907, 411908, B32B 324

Patent

active

044461852

ABSTRACT:
A reaction injection molded article formed with threads and a method of molding same, wherein threaded members, such as threaded inserts, helicoils, etc., are positioned in the cavity of a reaction injection mold, and molding material is injected into the cavity to form the threaded members into a unitary structure with a body of the reaction injection molded article. The threaded members are securedly held in place by a surface layer of relatively high density. The molding material is a mixture of an A liquid and a B liquid, the A liquid containing 100 weight parts of polyether polyol obtained by adding alkylene oxide to various kinds of alcohol or amine, 1-5 weight parts of a reaction promoting agent (catalyst) comprising tertiary amines, tin compounds, etc., 3-50 weight parts of water and a foaming agent, such as low boiling point alkylhalide, 1-5 weight parts of a foaming regulating agent, such as alkylene oxide denatured polydimethyl siloxane and 1-20 weight parts, if necessary, of pigment, dyestuff and filler, such as carbon black, diazo compound, silica, glass fiber, etc., and the B liquid containing 100-200 weight parts of MDI, TDI, crude MDI or crude TDI.

REFERENCES:
patent: 4283898 (1981-08-01), Claver

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