Process for the manufacture of prepregs
Abstract
Abstract PROCESS FOR THE MANUFACTURE OF PREPREGS FROM PREIMPREGNATED ENDLESS FILAMENTS, HANKS, ROVING MATS, KNITTED FABRICS OR WOVEN FABRICS BASED ON INORGANIC FIBRE MATERIALS OF HIGH MECHANICAL PERFORMANCE, OR HIGHLY HEATRESISTANT ORGANIC FIBRES, BY IMPREGNATING THE SUBSTRATE WITH A SOLUTION CONTAINING (A) A CURABLE POLYADDUCT, STILL CONTAINING FREE GLYCIDYL GROUPS, OR TRIGLYCIDYLISOCYANURATE AND A LESS THAN EQUIVALENT AMOUNT OF CURING AGENT, WHICH IS OBTAINED BY REACTING TRIGLYCIDYLISOCYANURATE WITH CYCLOALIPHATIC, AROMATIC OR HETEROCYCLIC POLYAMINES WHICH CONTAIN AT LEAST TWO PRIMARY AMINO GROUPS, AT ELEVATED TEMPERATURE, WITH 0.05 TO 0.5 AMINE HYDROGEN EQUIVALENT OF THE POLYAMINE BEING EMPLOYED PER 1 EPOXIDE EQUIVALENT OF THE TRIGLYCIDYLISOCYANURATE, (B) A CURING AGENT IN AN AMOUNT SUFFICIENT FOR COMPLETE CURING OF THE POLYADDUCT (A) AND (C) AN ORGANIC SOLVENT, AND BY SUBSEQUENTLY DRYING THE IMPREGNATED SUBSTRATES.
Inventors
- 👤 Heinz Rembold
- 👤 Ewald Losert
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |