Controlled sparse and percolating cross-linking in waterborne soft adhesives.

The effect of low levels of cross-linking on the adhesive and mechanical properties of waterborne pressure-sensitive adhesives was investigated. We have taken advantage of a core-shell latex particle morphology obtained by emulsion polymerization to create a heterogeneous structure of cross-links without major modification of the monomer composition. The latex particles comprise a shell containing cross-linkable diacetone acrylamide (DAAM) repeat units localized on the periphery of a slightly softer core copolymer of very similar composition.

A comparison of tackified, miniemulsion core-shell acrylic latex films with corresponding particle-blend films: structure-property relationships.

Tackifying resins (TRs) are often added to pressure-sensitive adhesive films to increase their peel strength and adhesion energy. In waterborne adhesives, the TR is dispersed in water using surfactants and then blended with colloidal polymers in water (i.e.

Primary structure of acidic oligosaccharide-alditols derived from the jelly coat of Ambystoma tigrinum. Occurrence of oligosaccharides with fucosyl(alpha 1-5)[fucosyl(alpha 1-4)]-3-deoxy-D-glycero-D-galacto- nonulosonic acid and fucosyl (alpha 1-2) galactosyl (alpha 1-3)-N- acetylgalactosamine sequences.

Eleven O-glycosidic carbohydrate units derived from the jelly coat of Ambystoma tigrinum were analyzed by 1H-NMR spectroscopy. As previously shown for four other amphibian species, the glycans display a remarkable species specificity. As a characteristic feature, 3-deoxy-D-glycero-D-galacto-nonulosonic acid (Kdn) was found difucosylated at C4 and C5, and alpha-Gal attached to C3 of GalNAc-ol.