초록 ▼

A method of coating the surface of a substrate, such as a film or a fibrous web, which is composed of a hydrophobic polymer. The method involves providing a solution of a first polyelectrolyte having ionizable groups and a solution of a second polyelectrolyte having ionizable groups. The two solutio

A method of coating the surface of a substrate, such as a film or a fibrous web, which is composed of a hydrophobic polymer. The method involves providing a solution of a first polyelectrolyte having ionizable groups and a solution of a second polyelectrolyte having ionizable groups. The two solutions then are mixed under conditions adapted to result in the formation of a nonstoichiometric polyelectrolyte complex. Finally, the surface of the hydrophobic polymer substrate is contacted with a solution of the complex under conditions sufficient to result in the coating of the surface of the substrate with the complex. The ionizable groups of the second polyelectrolyte have a latent charge opposite the latent charge of the ionizable groups of the first polyelectrolyte. Moreover, the amounts of the first and second polyelectrolytes are selected to give a ratio of the number of ionizable groups in the first polyelectrolyte to the number of ionizable groups in the second polyelectrolyte of at least about 2, and the molecular weight of the first polyelectrolyte is at least about 40,000 daltons and at least about 2 times the molecular weight of the second polyelectrolyte.

대표청구항 ▼

[ What is claimed is:] [21.] A coated substrate comprising:a substrate comprised of a hydrophobic polymer; anda substantially uniform coating of a nonstoichiometric polyelectrolyte complex on a surface of the substrate; rein:the polyelectrolyte complex is comprised of a first polyelectrolyte having

[ What is claimed is:] [21.] A coated substrate comprising:a substrate comprised of a hydrophobic polymer; anda substantially uniform coating of a nonstoichiometric polyelectrolyte complex on a surface of the substrate; rein:the polyelectrolyte complex is comprised of a first polyelectrolyte having a first molecular weight and ionizable groups with a first latent charge, and a second polyelectrolyte having a second molecular weight and ionizable groups with a second latent charge;the second latent charge is opposite the first latent charge;the ratio of the number of ionizable groups in the first polyelectrolyte to the number of ionizable groups in the second polyelectrolyte is at least about 2; andthe first molecular weight is at least about 40,000 daltons and at least about 2 times the second molecular weight.