Process for producing artificial leather
AssigneeToyo Cloth Co., Ltd.
InventorsYoshifumi Nishibayashi, Atsushi Shimizu, Yasuhiro Shiga, Kenji Okabe, Ken-ichi Baba
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Abstract
Artificial leather is produced by applying a dope comprising urethane prepolymers containing terminal isocyanate groups, an amine catalyst and a foam stabilizer onto a releasing carrier sheet, exposing the resulting coating layer to a moisture-containing gas under controlled conditions, laminating the coating layer onto a backing material and stripping off the releasing carrier sheet. The resulting artificial leather has a cellular structure of polyurethane microfoam in adhesion with the backing material and an adhesion strength of 100 to 10,000 g/cm of width.
Claims20
A method for producing artificial leather which comprises:
- a. applying a dope comprising 100 parts by weight of a urethane prepolymer having an average molecular weight of 500-10,000 and containing about 2 to 10% by weight of terminal isocyanate groups, about 0.5 to 10 parts by weight of an amine catalyst and about 0.05 to 3 parts by weight of foam stabilizer dissolved in a hydrophobic solvent to a releasing carrier sheet;
- b. exposing the resulting coating layer to a moisture containing gas at an absolute humidity of from about 2 to 50 g/m.sup.3 and a temperature of 60.degree.-200.degree. C. for a sufficient period of time greater than 0.1 minute to produce microfoam in the coating layer;
- c. laminating said coating layer onto a backing material while it is adhesive;
- d. allowing the laminated layer to produce a polyurethane layer having a permanent adhesion with the backing material so that an adhesion strength of about 100 to 10,000 g/cm of the width of the transferred lay is obtained;
- and
- e. stripping off the carrier sheet thereform.
Dependencies are inferred from the claim text.