Aqueous latex of vinylidene chloride copolymer An aqueous latex [latex (L)] of a vinylidene chloride copolymer [copolymer (A)], wherein the copolymer (A) consists essentially of recurring units derived from vinylidene chloride (VDC) in an amount comprised between 89.0 and 91.0 wt % of the copolymer, recurring units derived from methacrylonitrile (MAN) in an amount comprised between 2.00 and 5.50 wt % of the copolymer, recurring units derived from at least one ionic comonomer (ICO) in an amount comprised between 0.5 and 1.4 wt % of the copolymer (A), and recurring units derived from methylmethacrylate (MMA) in an amount such that the total of recurring units of VDC, MAN, ICO and MMA is 100 wt %, and wherein the latex (L) comprises at least one surfactant [surfactant (S)] in an amount comprised between 0.09 and 1.50 wt % of the copolymer (A).
Process for the manufacture of the aqueous latex (L), film made therefrom and retort pouch prepared with such film.

The resin composition according to one aspect is a resin composition containing a polyamic acid and a solvent, wherein the polyamic acid has a repeating unit represented by the following general formula (1) in a molecular chain, and the molecular chain has a structure represented by the following general formula (2) at one end or both ends. The proportion of the structure represented by the following general formula (2) relative to 1 mol of the repeating unit represented by the following general formula (1) is 0.001 mol or more and 0.1 mol or less. In the following general formulas, R.sup.1 is a tetravalent organic group; R.sup.2 is a divalent organic group; and R.sup.3 is an organic group having 15 or less carbon atoms.

##STR00001##

The present invention relates to a method of manufacturing a cellulosic film (cellulose film), particularly a cellulosic food packing film, especially a detectable cellulosic film, which cellulosic film comprises detectable particles incorporated therein, as well as to the cellulosic film thus produced and to its applications and usages (i.e. its use).

A foamed polymeric insulation product comprises a polymeric foam formed from a foamable polymer composition comprising: a) a thermoplastic matrix polymer composition, and b) a blowing agent composition. A barrier coating is formed on at least one of the first major surface and the second major surface, the barrier coating being formed from a barrier coating composition comprising a dispersion of at least one polymer comprising at least one polymer selected from polyvinylidene dichloride (PVDC), polyvinylidene fluoride (PVDF), polyvinyl chloride (PVC), polyvinyl alcohol, ethylene vinyl alcohol, polyurethane, styrene butadiene (SBR), and combinations or copolymers thereof; and a viscosity modifier.

A composite film comprising a of amide substrate layer having a first and second surface, and a primer coating layer disposed on the first surface of the substrate layer, wherein the primer coating layer is derived from a composition comprising an acid copolymer resin, an organic crosslinker and an acid catalyst. A heat-sealable coating is applied on the primer.

A laminate film includes a substrate layer; and a metal oxide layer which is provided on one surface or both surfaces of the substrate layer and contains a metal oxide. Further, the oxygen permeability measured under defined conditions is 20 ml/m.sup.2.Math.day.Math.MPa or less and the water vapor permeability measured under conditions of a temperature of 40° C. and a humidity of 90% RH is 2.5 g/m.sup.2.day or greater. In addition, when the Kα beam intensity of a metal constituting the metal oxide which is obtained by performing fluorescence X-ray analysis on the metal oxide layer is set to A and the Kα beam intensity of the metal which is obtained by performing fluorescence X-ray analysis on a metal layer formed of the metal constituting the metal oxide is set to B, A/B is equal to or greater than 0.20 and equal to or less than 0.97.

To provide a multilayer film for a disposable body warmer outer bag, and a disposable body warmer that are excellent in gas barrier property which inhibits permeation of oxygen gas, water vapor and the like, and that can allow swelling due to hydrogen gas generated during a storage period to be prevented.

In a disposable body warmer outer bag formed from a multilayer film including a sealant layer 10 and a barrier layer 20, the sealant layer 10 and the barrier layer 20 serve as an inner surface and an outer surface of the outer bag, respectively. The sealant layer 10 includes a vapor-deposited layer 12 made by vapor-depositing a metal or metal oxide on at least one surface (upper portion in FIG. 1) of a thermal fusible resin substrate 11. The barrier layer 20 includes a polyvinylidene chloride layer 22 made by coating at least one surface (lower portion in FIG. 1) of a heat-resistant resin substrate 21 with polyvinylidene chloride.

Provided is a packaging film including: a substrate layer that includes polyethylene; and a coating layer that includes a resin and is provided in contact with one surface of the substrate layer or is provided over one surface of the substrate layer through an anchor coat layer. In one preferable aspect of the packaging film, when a glass transition temperature of the coating layer is represented by Tgc and a glass transition temperature of the substrate layer is represented by Tgs, a value of Tgc is −25° C. to 120° C. and a value of Tgc-Tgs is 90° C. to 245° C.

There is described a method of manufacturing a security article, said method comprising the steps of: introducing into an offset printing device a transparent film comprising a non-fibrous substrate layer of regenerated cellulose; disposing an opacification layer on at least a portion of at least one surface of said film by a first offset printing step; and disposing printed information on at least a portion of said opacification layer by a second offset printing step.

Provided is a process for preparing a PVDC additive blend in which an additive is blended with PVDC under high shear blending to produce a highly uniform blend in which the additive is homogeneously distributed throughout the PVDC. It has been found that performing high shear blending in multiple successive stages in which the concentration of the additive in the blend is reduced in each successive stage helps in prove the uniformity of the PVDC additive blend. For example, the high shear blending may be carried out in 2 to 6 stages, and in particular, from 2 to 4 stages. Also provided is a PVDC additive blend having a uniform blend of PVDC and an additive, such as a blend of a PVDC copolymer of vinylidene chloride and methyl acrylate and a fluorescing agent, such as 2,2′(2,5-thiophenylendiyl)bis(5-tert-butylbenzoxazole).