What is Adhesion?
Laminating adhesives for packaging and industrial double-coated adhesive tapes are typical examples of adhesive technology. Laminating adhesives are used to laminate multiple pieces of film materials. Various kinds of capabilities are demanded from them depending on the application. For foods, these are heat and cold resistance characteristics for boiling, retort treatments, and freezing. For shampoo and conditioner, these are content resisting properties, chemical resistance, and hygiene. Industrial double-coated adhesive tapes are used to join components in cellular phones, IT products like PCs, home electronics, and office equipment. They have characteristics like being able to strongly bond components with just a light amount of pressure and not easily delaminating. They are used as alternatives to screws and adhesives because of advantages like even thickness and freedom of design, and their use contributes to making products slimmer and smaller.
DIC's Adhesion Technology
DIC has advanced knowledge of polymer design and synthesizing technology, resin design for adhesive coating films matched to the laminated materials and demanded capabilities, and additive blending techniques. Solvent-type glues and adhesives that use conventional organic solvents also have a problems where they pollute the air and release VOCs, a cause of sick house syndrome. As movements to reduce VOC advance worldwide, DIC is pursuing research and development of emulsion-type adhesives which can replace solvent-type adhesives, and these have greatly reduced VOCs and odors. In reinforced glass touchscreens on portable audio players, a film is applied so glass does not shatter when the touchscreen breaks, and we have developed a film with high surface hardness that is hard to scratch and fingerprint resistant. In laminating adhesives for packaging and containers like food containers, we are putting our utmost efforts into reducing VOCs by developing high solid-type adhesives and solventless adhesives.
Examples of DIC products created by adhesion technology
Dicdry 2K-SF Series
Solventless laminating adhesive
By using a high performance emulsion-type adhesive newly developed by DIC, VOC emissions have been reduced over 90% when compared to DIC's conventional products, and the odor has been greatly reduced. This emulsion-type adhesive achieves strong bonding properties and bonding reliability at the same level as solvent-types, which had been deemed difficult to accomplish. It solves the highly difficult issue from a technical standpoint of achieving both strong bonding properties & bonding reliability and the ease of peeling. The key to this was the newly developed high strength core material that has excellent adherability with the emulsion-type adhesive. This makes the tape strong and it can be peeled off without breaking.
Solventless adhesives are a type of adhesive that harden by mixing the base compound with a hardener. The base compound and the hardener are separately warmed in advance in an automatic feed tank and mixed in the feed section. The amount applied to the laminate materials in rolls that will be bonded is controlled by adjusting the revolution ratio of each roll.
Dicdry 2K-SF-380A/HA-380B is supplied by DIC for normal applications to the Japanese domestic market as a solventless adhesive product. The market is asking for adhesives with even better heat resistance and content resisting properties, so we developed Dicdry 2K-SF-930A/HA-930B, an ester-based adhesive for aluminum retort packaging, that can be used at even higher temperatures. This product is an FDA (US Food and Drug Administration) standard approved product that was designed with attention paid to hygienic aspects.