Reaction injection molded article with threads and method of molding same
US4446185A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1982 |
| Grant date | May 1, 1984 |
| Priority date | — |
| Expiry date | Mar 8, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249989
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.