Solutions based on polyvinyl chloride, the process for their preparation and yarns and fibres thus obtained
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United States of America Patent
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Jul 16, 1985
Grant Date -
N/A
app pub date -
Mar 18, 1983
filing date -
Apr 1, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to new homogeneous solutions based on polyvinyl chloride, which can be shaped, the process for their preparation and the shaped articles obtained. For a polymer concentration of 15 to 35%, the solutions have an effective viscosity of between 15 and 2,000 poises in a solvent medium which has, at ambient temperature, a solubility parameter of between 8 and 11 and a dielectric constant of between 5 and 25, and which gives, with polyvinyl chloride, a variation in effective viscosity with temperature, represented by a curve d.rho./d.theta., which passes through a maximum absolute value. They are obtained by heating a composition of polyvinyl chloride in the solvent medium to a temperature which is at least 25.degree. C. higher than the average temperature corresponding to the maximum of the curve d.rho./d.theta.. The yarns and fibres obtained, which have good properties, can be used by themselves or in a blend for the production of woven fabrics, knitted fabrics, non-woven structures and the like.
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