Method for preparing polyisocyanurate composite
US5071939A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1990 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Feb 15, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31547
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for preparing a polyisocyanurate composite obtained by injecting a formulated liquid comprises an organic polyisocyanate, a polyol and a trimerization catalyst into a mold in which a fibrous reinforcing material is previously set by use of a reaction injection molding machine, wherein: PA0 (1) a single or mixed polyether polyol having a hydroxyl value of 40 to 400 is used as the polyol; and PA0 (2) the formulation ratio of the organic polyisocyanate and the polyol in terms of the isocyanurated isocyanate concentration [NCO].sub.T defined by the following formula (1) is in the range of 3.0 to 5.5 mmol/g: ##EQU1## [NCO].sub.T : theoretical concentration of isocyanate group consumed in isocyanuration; PA0 [NCO].sub.O : isocyanate group concentration in organic polyisocyanate (mmol/g); PA0 OH-V: hydroxyl value of single or mixed polyol; PA0 W.sub.A : weight fraction of organic polyisocyanate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.