Polyisocyanates and resin compositions thereof
AssigneeTakeda Chemical Industries, Ltd.
InventorsShoichi Fujita, Kohji Nasu
Life of this patent
Estimating the term…
Abstract
A polyisocyanate having a biuret structure obtained by allowing .alpha.,.alpha.,.alpha.',.alpha.'-tetramethyl-xylylene diisocyanate, a diisocyanate represented by the general formula: OCN--CH.sub.2 --R--CH.sub.2 --NCO wherein R is a divalent hydrocarbon residue and water to react. The polyisocyanate is used in the form of the two-part type of polyurethane composition in combination with a polyol. The composition can provide coating films which excel in every physical properties required for the coating film, such as drying property, impact resistance, weathering resistance and chemical resistance, and therefore are advantageously used, for example, as a paint for automobile repairing uses, etc.
Claims10
A polyisocyanate having a biuret structure obtained by allowing .alpha.,.alpha., .alpha.',.alpha.'-tetramethyl-xylylene diisocyanate, a diisocyanate represented by the general formula:
- OCN--CH.sub.2 --R--CH.sub.2 --NCO
- wherein R is a divalent hydrocarbon residue having 1-12 carbon atoms and water to react.
The polyisocyanate as claimed in claim l, wherein the proportion in which the mixed diisocyanate is used is not less than 3 moles of the mixed diisocyanate per mole of water.
A resin composition which comprises (1) a polyisocyanate having a biuret structure obtained by allowing .alpha.,.alpha.,.alpha.',.alpha.'-tetramethyl-xylylene diisocyanate, a diisocyanate represented by the general formula:
- OCN--CH.sub.2 --R--CH.sub.2 --NCO
- wherein R is a divalent hydrocarbon residue having 1-12 carbon atoms and water to react and (2) a polyol.
Dependencies are inferred from the claim text.