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AssigneeNisshinbo Industries, Inc.
InventorsYasuo Imashiro, Ikuo Takahashi, Naofumi Horie, Takeshi Yamane, Shigekazu Suzuki
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A carbodiimide crosslinking agent comprises, as its main component, a decarbonated condensate of (A) one or more isocyanates selected from isocyanates having at least two isocyanate groups bonded to the carbon of the methylene group in the molecule, and (B) one or more isocyanates selected from alicyclic or aliphatic diisocyanates other than those defined in (A). The condensate is blocked at terminal isocyanates thereof with a hydrophilic group. A process for preparing the crosslinking agent, and a coating material comprising the agent are also described, along with a specific type of crosslinking agent for polyvinyl alcohols.
A carbodiimide crosslinking agent comprising a decarbonated condensate of one or more diisocyanates selected from the group consisting of hexamethylene diisocyanate (HDI), hydrogenated xylylene diisocyanate (H.sub.6 XDI), xylylene diisocyanate (XDI), 2,2,4-trimethyl-hexamethylene diisocyanate (TMHDI), 1,12-diisocyanato-dodecane (DDI), norbornane diisocyanat+e (NBDI) and 2,4-bis-(8-isocyanatooctyl)-1,3-dioctyl cyclobutane (OCDI).
A crosslinking agent for polyvinyl alcohol comprising a water-soluble or dispersible carbodiimide compound consisting essentially of a condensate obtained by decarbonation condensation of a diisocyanate or a mixture of a diisocyanate and a triisocyanate wherein said condensate is blocked at terminal isocyanate groups with a hydrophilic group.
A coating material comprising a polyvinyl alcohol and a water-soluble or dispersible carbodiimide compound consisting essentially of a condensate obtained by decarbonation condensation of a diisocyanate or a mixture of a diisocyanate and a triisocyanate wherein said condensate is blocked at terminal isocyanate groups with a hydrophilic group.
A process for crosslinking polyvinyl alcohol comprising combining polyvinyl alcohol with a water-soluble or dispersible carbodiimide compound consisting essentially of a condensate obtained by decarbonation condensation of a diisocyanate or a mixture of a diisocyanate and a triisocyanate wherein said condensate is blocked at terminal isocyanate groups with a hydrophilic group.
Dependencies are inferred from the claim text.