摘要:
Barrier coating mixtures contain in a carrier liquid, (a) a non-elastomeric polymer; (b) an exfoliated layered platelet-like silicate filler which may or may not have been acid or base treated that has not been functionalized with organic cations having an aspect ratio greater than 25; and (c) at least one additive, wherein the total solids content is less than 30% and the amount of filler is between 5% to about 60% of the total solids content. Coated articles and containers, freestanding films and packaging films are produced using the barrier coating mixtures. Methods of manufacturing such coated products are also encompassed.
摘要:
An aqueous barrier coating composition in the form of a dispersion includes: (a) water; (b) a polyester matrix polymer; (c) a platy to hyperplaty kaolin filler having an average shape factor of at least about 40:1, the composition being further characterized in that: (i) the composition has a solids content of from more than 20 weight percent up to 70 percent by weight; (ii) the composition has a weight ratio of polyester matrix polymer:kaolin filler of from 4:1 to 0.75:1; and (iii) a film formed from the composition exhibits at least 5-fold reduction in oxygen permeability as compared with a like film formed of said polyester matrix polymer. Also disclosed are barrier coatings derived from the compositions as well as packaging composites incorporating a barrier film formed from the compositions.
摘要:
Barrier coating mixtures include (a) a mixture of pre-vulcanized and non-vulcanized elastomeric polymers; (b) an acid or base treated dispersed, substantially exfoliated silicate filler material that has not been functionalized with organic cations having an aspect ratio greater than 25; and (c) at least one additive, wherein the total solids content is less than 30% and the amount of filler is between 5% to about 60% of the total solids content. The coating retains its permeability properties under strain and has a strain to first damage of at least 10% biaxial elongation at 0% RH.Coated articles, free standing films and membranes, which are flexible and elastomeric, are produced using the barrier coating mixtures. Methods of manufacturing of such coated products are also encompassed.
摘要:
Processes for recovering 4,4'-dimethyl bibenzoate (DMBB) from byproduct streams of dimethyl terephthalate (DMT) production are disclosed. The byproduct streams are treated to produce an overhead stream which includes DMBB. In one aspect of the invention, the overhead product stream is added to an organic solvent under conditions sufficient to rapidly form a suspension of crystallized DMBB. In another aspect of the invention, the overhead is dissolved in an appropriate organic solvent and cooled to form a suspension of DMBB crystals in the solvent. A portion of the suspension is removed, and the remaining portion of the suspension centrifuged to recover DMBB crystals. In still another aspect of the invention, the overhead stream is treated with an organic solvent to form a slurry of DMBB crystals, and the resultant slurry thermally treated to increase the concentration of DMBB crystals therein while also solubilizing any organic contaminants.
摘要:
An evacuated container assembly suitable for use in connection with blood collection including: (a) a container member formed of a first polymeric material and having a sidewall and one or more openings; (b) a nanocomposite barrier coating disposed on the container member having a thickness of up to about 30 microns and being derived from an aqueous dispersion including (i) a dispersed barrier matrix polymer; and (ii) a substantially exfoliated silicate filler having an aspect ratio of more than 50; and (c) one or more sealing members disposed in the opening(s) operative to hermetically seal the cavity; wherein the cavity is evacuated and maintains a pressure below atmospheric pressure and exhibits a draw volume loss lower than that of a like assembly without a nanocomposite barrier film by a factor of at least 1.5.
摘要:
Films or other articles having a barrier coating derived from a concentrated nanocomposite dispersion which includes a silicate filler and a matrix polymer dispersed in an aqueous medium. The dispersions are condensed by selectively removing liquid therefrom to provide high solids coating formulations.
摘要:
A concentrated nanocomposite dispersion which includes a silicate filler and a matrix polymer dispersed in an aqueous medium. The dispersions are condensed by selectively removing liquid therefrom, to provide high solids coating formulations. The concentrated formulations provide coatings which are good barriers to oxygen and other gases.
摘要:
A concentrated nanocomposite dispersion which includes a silicate filler and a matrix polymer dispersed in an aqueous medium. The dispersions are condensed by selectively removing liquid therefrom, to provide high solids coating formulations. The concentrated formulations provide coatings which are good barriers to oxygen and other gases.
摘要:
A gas barrier film includes an anionically functionalized matrix resin and a platy mineral filler. The formed film is surface-treated with a multi-valent metal cation crosslinking agent to stabilize the barrier film against performance loss at elevated levels of relative humidity.
摘要:
The invention relates in one aspect to a post-formulation concentrated nanocomposite dispersion containing an invisible marker dye. The dispersion typically includes a silicate filler and a matrix polymer dispersed in an aqueous medium as well. The dispersions form optically transparent barrier films wherein the dye is effective to indicate film thickness on a substrate. Specific embodiments of this invention include a nanocomposite coating formulation designed to provide transparent high barrier coatings at thicknesses from 1 to 10 microns that include a near infrared (NIR) or infrared (IR) dye that enables rapid measurement of coating thickness and uniformity. The preferred dye imparts no observable color or appearance change, and thus can also function as an identifier for the coating.