A gas barrier laminate including a resin substrate, a first coating layer containing a carboxylic acid polymer; and a second coating layer containing a polyvalent metal compound and a resin, laminated in this order; a ratio of a thickness of the second coating layer to the first coating layer in the range of 1.0 or more and 4.0 or less; and the second coating layer satisfies at least one of the following: (condition 1) a haze of the second coating layer is 8% or less; (condition 2) a surface roughness Ra of the second coating layer is or less of the thickness of the second coating layer; and (condition 3) the number of concave portions having a diameter of 1.5 m or more per unit area on a surface of the second coating layer opposite to the first coating layer is 2/0.01 mm.sup.2 or less.

This invention relates to a one-step process for making a polymer composite suspension for coating plastic films characterized in that a first polymer is synthesized in-situ optionally in the presence of other polymers and in the presence of clay. Preferably the polymer composite suspension comprises a) 1.0 to 11.0 wt % of clay or silane modified clay, b) 0.1 to 10.0) wt % of poly (acrylic acid), which is a copolymer of acrylic acid (AA) with at least one other monomer selected from 2-ethylhexyl acrylate (EHA), -carboxyethyl acrylate (-CEA), methacrylamidoethyl ethylene urea (WAM II) and ethoxylated behenyl methacrylate (-FM), c) 1.0 to 15.0 wt % of other polymers, preferably poly (vinyl alcohol) and d) 70 to 97 wt % of water or mixture of water with 2-propanol. The coating films made from the suspensions show good barrier capabilities against water vapor and oxygen can be used to make barrier layers on or within plastic films for packaging applications. The invention also relates to methods for making silane modified clay usable in the process for making the suspensions.

The present invention discloses a low cost bio-based full degradable film and preparation method thereof, the ratio of each component in parts by mass of the film is as follows: 15-25 parts of a polyglycolic acid, 25-35 parts of corn starch, 35-55 parts of poly(butylene adipate-co-terephthalate), 5 parts of a compatilizer, 3.75-12.25 parts of a starch plasticizer, 0.5-0.7 part of citric acid, 0.75-1.25 parts of acetyl tributyl citrate, 0.3-0.5 part of maleic anhydride, 0.2 part of antioxidant 164, and 0.2 part of 2-(2-hydroxyl-5-methylphenyl)benzotriazole. The low cost bio-based full degradable film provided by the present invention has a bio-based content, which can reach 30% or more, a lower cost, and a tensile strength exceeding a traditional PE thin film, and has very important significance for solving the problem of white pollution and promoting the popularization and application of full biodegradable materials.

A method of applying a gas-impermeable coating includes forming a polyelectrolyte complex suspension. The polyelectrolyte complex suspension is applied to a substrate. The substrate having the polyelectrolyte complex applied theron is treated. The treating reduces salt content of the polyelectrolyte complex. The treating results in a gas-impermeable coating being formed on the substrate

Nanostructured polyelectrolyte bilayers deposited by Layer-by-Layer deposition on nanoporous membranes can be selectively crosslinked to modify the polyelectrolyte charge density and control ionic selectivity independent of ionic conductivity. For example, the polyelectrolyte bilayer can comprise a cationic polymer layer, such as poly(ethyleneimine), and an anionic polymer layer, such as poly(acrylic acid). Increasing the number of bilayers increases the cation selectivity when the poly(ethyleneimine) layer is crosslinked with glutaraldehyde. Crosslinking the membranes also increases the chemical and mechanical strength of the polyelectrolyte films. This controllable and inexpensive method can be used to create ion-selective and mechanically robust membranes on porous supports for a wide range of applications.

Disclosed is a preparation method of an all-weather self-healing stretchable conductive material, which uses acrylic acid and modified polyglutamic acid as a substrate, adds Fe.sup.3+ to form coordination, adjusts the volume ratio of water and glycerin, and heats to generate radical polymerization, so as to obtain a uniform double-layer three-dimensional network structure. The obtained polyacrylic acid and polyglutamic acid composite hydrogel has good mechanical properties and characteristics of rapid self-healing. A composite carbon film is prepared by depositing a metal layer of 20 nm to 80 nm thick on a single-layer aligned carbon film by magnetron sputtering, and then the composite hydrogel is adhered to each of the upper and lower sides of the composite carbon film respectively to form an all-weather self-healing stretchable conductive material of a sandwich structure. The preparation method of the invention is simple, the source of raw materials is plenty, and the obtained materials have good electrical and mechanical properties and have broad application prospects in the fields of flexible stretchable devices, wearable devices, and soft-bodied robots and the like.

A self-reinforcing composite gel includes a solvent, and a plurality of swellable crosslinked polymer particles dispersed in a crosslinked polymer matrix, wherein the crosslinked polymer matrix and the plurality of swellable crosslinked polymer particles are immersed in the solvent, wherein the swellable crosslinked polymer particles absorb more solvent at equilibrium than the matrix polymer, and wherein the plurality of swellable crosslinked polymer particles swell in the solvent and are present in an amount sufficient to maintain or increase the elastic modulus and/or load-bearing ability of the self-reinforcing composite gel, i.e., compared to that of the crosslinked matrix polymer alone, upon swelling in the solvent.

An anti-forgery color conversion film includes a photonic crystal structure whose color is converted by an external stimulus such as a breath. The photonic crystal structure includes a first refractive index layer including a first polymer exhibiting a first refractive index; and a second refractive index layer which is alternately laminated with the first refractive index layer and includes a second polymer exhibiting a second refractive index. A consumer who purchases an article including the color conversion film may easily distinguish the authenticity of the article.

The present invention provides a water-soluble film having excellent solubility in cold water, high strength, and excellent hard-water resistance. The present invention also provides a method for simply producing such a water-soluble film. One aspect of the present invention relates to a water-soluble film including a polymer containing an anionic group other than a sulfonic acid (salt) group, and a water-soluble resin. The anionic group-containing polymer excludes an acrylic acid homopolymer. Another aspect of the present invention relates to a method for producing a water-soluble film that includes a polymer containing an anionic group other than a sulfonic acid (salt) group, and a water-soluble resin. The method includes mixing a polymer containing an anionic group other than a sulfonic acid (salt) group and a water-soluble resin.

A method for producing a polyolefin-based porous film includes an (A) step: a raw fabric forming step for forming a non-porous raw fabric from a polyolefin-based resin composition, a (B) step: an MD cold stretching step for cold stretching the non-porous raw fabric obtained in the (A) step at a temperature of 20 C. to (Tm30) C. (Tm is a melting point ( C.) of the non-porous raw fabric) in an extruding direction (MD) of the raw fabric to make the raw fabric porous; a (D) step: a TD cold stretching step for cold stretching a film processed in the (B) step in a direction (TD) perpendicular to the MD, and an (H) step: a thermal fixing step, in the above order.