Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1986-11-13
1989-04-11
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428221, 428224, 428253, 428283, 428294, 428295, 428327, 428402, 428408, 428902, B32B 516
Patent
active
048205753
ABSTRACT:
The invention relates to a reinforcing material for duroplastics and a process of preparing the same by embedding hollow body fillers (microspheres) in the interspaces of the fibers of a web, knitted fabric or stitch bonded products of fibers having a high modulus of elasticity. By virtue of the incorporation of the hollow body fillers, the particle diameter of which amounts to between 20 and 300 .mu.m, the absorbing capacity for liquid curable resins can be adjusted to the desired value. The process of the subject invention teaches to incorporate the unexpanded preform of a hollow body filler into the interspaces of the fibers and to subject the so-obtained material for a sufficient period of time to the temperature necessary for the blowing process of the preform. The reinforcing material can be used for preparing light laminates of duroplastic materials (FIG. 1).
REFERENCES:
patent: 4460642 (1984-07-01), Frredi et al.
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