Method of making a leather-like sheet material by coagulating two polymers
AssigneeKuraray Co., Ltd.
InventorsTsuyoshi Yamasaki, Kunio Kogame
Life of this patent
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Abstract
Method of making a leather-like sheet material having a low bounce impact elasticity, which comprises: (a) mixing (i) a solvent solution of a polymer (A) consisting mainly of an elastomer and (ii) a dispersion in a liquid of a polymer (B) consisting mainly of an elastomer, thereby obtaining a composite solution containing fine particles of (B) dispersed in a solution of polymer (A); (b) coating a sheet or impregnating a fibrous mat substrate with the composite solution; (c) immersing the substrate in a coagulation bath to deposit and coagulate both polymers; and (d) drying said sheet or mat.
Claims4
A method for producing a leather-like sheet material having a good sponge structure and low bounce impact elasticity, which comprises,
- a. preparing a composite solution by mixing (i) a solvent solution of a polymer (A) consisting mainly of an elastomer having an initial modulus of less than 5.times.10.sup.2 Kg/cm.sup.2 and (ii) a dispersion in a liquid dispersing medium of a polymer (B) consisting mainly of an elastomer having an initial modulus of less than 5.times.10.sup.2 Kg/cm.sup.2 and having a particle size less than 5.mu., said said solvent for (A) not completely dissolving (B), thereby resulting polymer (B) being dispersed but not completely dissolved in said composite solution, the ratio of (A) to (B) being in the range of 95 :
- 5 to 30 :
- 70 parts by weight;
- b. coating a supporting sheet in a given thickness or impregnating a fibrous mat with the composite solution;
- c. immersing the coated supporting sheet or the impregnated fibrous mat in a liquid coagulation bath for coagulating said polymers (A) and (B);
- thereby depositing and coagulating said polymers on said supporting sheet or in said fibrous mat;
- and sheet or said;
- d. drying said sheet or said mat.
A method as claimed in claim 13, wherein the fibrous mat is composed of mix spun fibers of at least two polymers having different solubility in a solvent.
Dependencies are inferred from the claim text.