Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1996-09-27
1999-02-02
Sergent, Rabon
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
25218212, 428402, 42840224, 428403, 428404, 428406, 428407, 528 61, 528 67, 528 68, 528 44, 525123, 525125, 525129, 525130, 525131, 524783, 524786, 524788, 524789, C08G 1832, C08G 1810, B32B 516
Patent
active
058666680
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a heat curable composition, more particularly to a heat curable composition useful for an adhesive, a sealant, a coating material and other formed products having an excellent storage stability in a sealed vessel, a low-temperature curability, a rubber-like physical property and the like.
PRIOR ART
Up to this date, a one-pack type heat curable composition which is prepared by dispersing a polyamine compound in an isocyanate component has been known, and one embodiment of such composition is a one-pack type heat curable composition which is prepared by blending an urethane prepolymer having a terminal active isocyanate group, which is obtained by reacting a polyol component with an excess amount of a polyisocyanate compound, with a dispersion of a solid amine in a liquid paraffin at a temperature of .ltoreq.40.degree. C. and the composition can be applied as an adhesive, a sealant and the like (see, Japanese Patent First Publication No. 32948/93). This known composition is cured at a temperature of over a melting point of a solid amine compound (e.g. 80.degree. C.), therefore it has an excellent low-temperature curability. However, it cannot be applied to practical use because of its insufficient storage stability in a sealed vessel (particularly, a storage stability at 40.degree. C.).
The storage stability is an important property in order to estimate a commercial value of a product such as an adhesive and a sealant, and further a low-temperature curability is also an important property for saving energy and saving resources. Accordingly, it is strongly demanded to develop a composition having both of the properties.
DETAILED DESCRIPTION OF THE INVENTION
Under the circumstances, the present inventors have intensively studied, and as a result, have found that by adding an additional amine-coating step onto a conventional process for preparing the known heat curable composition which comprises an isocyanate component and a solid amine, the solid amine can be dispersed more easily in an isocyanate component (a urethane prepolymer having a terminal active isocyanate group) and thereby the composition has excellent storage stability, wherein said amine-coating step comprising coating the active amino groups on the surface of the solid amine having a melting point .gtoreq.50.degree. C. and a specific mean particle size with fine particles having a specific mean particle size, further that the composition prepared according to such process can be heat-cured under a low-temperature condition (e.g. 60.degree. to 100.degree. C..times.10 min.) because the surface-coating of the solid amine is melted by heating to appear an active amino group on the surface thereof, and further that, in the above process, as an isocyanate component, a polyisocyanate compound can be used instead of or in a combination with an urethane prepolymer having a terminal active isocyanate group.
This invention provides a heat curable composition comprising active isocyanate group which is prepared by reacting a polyol component with an excess amount of a polyisocyanate compound, which are used each alone or in combination thereof; and amino group on the surface of a solid amine having a melting point of .gtoreq.50.degree. C. and a mean particle size of .ltoreq.20 .mu.m with fine particles having a mean particle size of .ltoreq.2 .mu.m in a ratio of the solid amine/the fine particles of 1/0.001 to 0.5 by weight.
The polyisocyanate compound used in this invention includes aromatic, aliphatic and alicyclic polyisocyanate compounds, for example, tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), 3,3'-dimethyl-4,4'-biphenylene diisocyanate, 1,4-phenylene diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, naphthylene diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, crude TDI, polymethylene polyphenyl isocyanate, isophorone diisocyanate, hexamethylene diisocyanate, hydrogenated xylylene diisocyanate, and isocyanurate, carbodiimide or biuret compounds of these isocy
REFERENCES:
patent: 4869961 (1989-09-01), Iwai et al.
Gotoh Johshi
Hattori Yoshiya
Maeda Nobuhiko
Okuno Tatsuya
Sergent Rabon
Sunstar Giken Kabushiki Kaisha
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