Stock material or miscellaneous articles – Structurally defined web or sheet – Honeycomb-like
Patent
1988-11-28
1991-08-06
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Honeycomb-like
264239, 264258, 428280, 428282, 428284, 428300, 4283084, 4283179, 4284231, 4284251, 428911, B32B 312
Patent
active
050376900
ABSTRACT:
The invention provides a novel shaped product comprising a sheet material of polyurethane resin material reinforced with binder-free natural-fibre material, such as jute, flax, hemp, coir, ampas, ramie or cotton, possibly combined with polypropylene, polyethylene and/or glass fibres. A preferred fibre material is jute, preferably in the form of jute needled felt. The invention also provides a process for making the product. In the process, a binder-free mat of natural-fibre material having a water content of at least 4% which is impregnated with a known per se mixture thermosettable to form a polyurethane material, comprising a polyether-polyol component and an isocyanate component, followed by maintaining the temperature of the mixture at 20.degree.-50.degree. C., and setting the impregnated fibrous mat in a closed mold at a pressure of 3.5-20 kg/cm.sup.2 and a temperature of 20.degree.-75.degree. C.
REFERENCES:
patent: 4182649 (1980-01-01), Isgur et al.
patent: 4954382 (1990-09-01), Riefler
Bell James J.
De Groot Automotives, B.V.
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