Laminate material having a microfibrous polyurethanic base sheet and process for its preparation
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United States of America Patent
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Jan 11, 1994
Grant Date -
N/A
app pub date -
Dec 29, 1992
filing date -
Oct 7, 1992
priority date (Note) -
Expired
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Abstract
An imitation leather laminate material comprises a base sheet consisting of 50 to 90% by weight of a microfiber felt wherein said microfibers are polyethylene terephthalate or polyamide 6 or polyamide 6--6 of from 0.05 to 0.4 denier, and 50 to 10% by weight of a polyurethane-polyurea polymer having an average molecular weight corresponding to a polymer solution viscosity within the range from 10,000 to 50,000 centipoise (cps) when the solution is 25% by weight in dimethylformamide at a temperature of 20.degree. C.; the resulting base sheet has final weight within 140 to 450 g/m.sup.2 and density within 0.20 to 0.40 g/cm.sup.3 and is backed with one or more functional substrates adhered thereto.
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