Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1985-01-15
1986-11-25
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428260, 428273, 428408, 428902, 428272, B32B 700
Patent
active
046248862
ABSTRACT:
A process for impregnating a fibrous product, said fibrous product being a fabric woven from reinforcing fibres or a fabric of randomly disposed fibres, with a matrix polymer comprising causing partial impregnation of the fibrous structure by introducing the fibrous structure into a molten composition comprising the matrix polymer and a melt plasticizer for the matrix polymer and subsequently causing substantially complete wetting of the filaments of the fibrous structure by volatilizing the melt plasticizer from the partially impregnated structure at a temperature at which the polymer is molten, the melt plasticizer being thermally stable at the temperature of the melt and having volatility characteristics such that the plasticizer can be removed below the decomposition temperature of the melt but sufficiently involatile at the temperature of the melt to permit the viscosity of the melt to be reduced by comparison with the melt viscosity of the polymer at the same temperature. When a woven fabric is employed thermoformable composites can be obtained having short beam shear strength values at least 0.7 times the tensile strength of the plastics matrix material of the composite.
REFERENCES:
patent: 4135028 (1979-01-01), Hiestand et al.
patent: 4410586 (1983-10-01), Ladizesky et al.
patent: 4496621 (1985-01-01), Habert et al.
patent: 4569884 (1986-02-01), Weinand et al.
Cogswell Frederic N.
Measuria Umakant
Bell James J.
Imperial Chemical Industries plc
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