Reaction products of shellac and monoepoxides as co-reactants fo

Details Reaction products of shellac and monoepoxides as co-reactants fo Reaction products of shellac and monoepoxides as co-reactants fo

1978-05-16

1979-03-27

Cockeram, H.S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

106218, 260 24, 260104, C09F 104, C08L 9302

Patent

active

041465334

ABSTRACT:
The new compounds of this invention, reactive with isocyanates, are comprised of reaction-products of shellac and monoepoxides. The epoxidation of the shellac is conducted within the temperature range of 90.degree. to 120.degree. C. under reflux conditions for approximately six hours. The properties are modified in the epoxy equivalent weight, the acid number, and in the solvency characteristics as compared to the unreacted monoepoxide and shellac. It is in part the change in the nature of the active solvents for the shellac-monoepoxide products that influences their effective utilization as co-reactants with polyisocyanates.
The preferred ratios of shellac to monoepoxide fall within the range of 1 to 2 epoxide equivalents of the monoepoxide, or approximately 1 to 2 monoepoxide g-molecular weights to 700 grams of shellac. Reaction with polyisocyanates may be conducted at room temperature or accelerated by elevating the temperature, such as up to 100.degree. C.; the cured products are transparent, bubble-free, flexible even in thick sections, adherent, tough and abrasion-resistant, having application as coatings, sealants, and caulking compounds.

REFERENCES:
patent: 3197422 (1965-07-01), Peterson et al.
patent: 3228782 (1966-01-01), Skeist et al.
patent: 3267088 (1966-08-01), Cockeram

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