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AssigneeMitsui Chemicals, Inc.
InventorsHisashi Kawanabe, Hiroaki Sakaguchi, Kazuto Usaka, Takashi Abe
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The two-component type polyurethane composition according to the present invention is obtained from a principal component containing a compound having an isocyanate group and a curing agent containing a compound having active hydrogen, and is characterized in that both the principal component and the curing agent contain substantially no thixotropic agent, the mixture of the principal component and the curing agent has a specific thixotropy-developing time and a specific slump, the active hydrogen compound has a specific flash point, and that the mass change of the two-component type polyurethane composition before/after boiling in boiling water under specific conditions is in a specific range. The two-component type polyurethane composition according to the present invention develops excellent thixotropy immediately after mixing the principal component and the curing agent, thereby enables its application under a variety of conditions such as mechanical-application and hand-application, and has excellent sag resistance and other physical properties suitable for sealing materials.
A two-component polyurethane composition obtained from a principal component comprising a compound having an isocyanate group and a curing agent comprising a compound having active hydrogen, both of the principal component and the curing agent comprising substantially no thixotropic agent, the total time from the moment of mixing the principal component and the curing agent to the moment of developing thixotropy being 2 seconds or shorter, the slump of the mixture of the principal component and the curing agent being 3 mm or smaller, the compound having the active hydrogen consisting of a compound having a flash point of 60° C. or higher, the change in mass of a cured two-component polyurethane composition before/after being boiled in boiling water under atmospheric pressure for 60 minutes being 0.6% by mass or smaller.
A two-component micro foamed polyurethane elastomer obtained from a principal component comprising a compound having an isocyanate group, a curing agent comprising a compound having active hydrogen, and a foaming agent, both of the principal component and the curing agent comprising substantially no thixotropic agent, the total time from the moment of mixing the principal component, the curing agent, and the foaming agent to the moment of developing thixotropy being 2 seconds or shorter, the slump of the mixture of the principal component, the curing agent, and the foaming agent being 3 mm or smaller, the compound having the active hydrogen consisting of a compound having a flash point of 60° C. or higher, the change in mass of a cured two-component polyurethane composition before/after being boiled in boiling water under atmospheric pressure for 60 minutes being 0.6% by mass or smaller.
Dependencies are inferred from the claim text.