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US 10,882,946 B2Granted
Polyester-epoxide polymer compositions
AssigneeStepan Company
InventorsWarren A. Kaplan, Jennifer S. Westfall
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AssigneeStepan Company
InventorsWarren A. Kaplan, Jennifer S. Westfall
Estimating the term…
Polyester-epoxide polymer (PEEP) compositions are disclosed. The PEEP compositions comprise a reaction product of a polyepoxide compound (eq. wt. 125 to 250 g/eq.) and a polyester polyol composition. The ratio of epoxy equivalents to hydroxyl equivalents is within the range of 0.8 to 3.5. The PEEP composition has a Tg within the range of −40° C. to 60° C. Elevated temperature-cure and low temperature-cure processes for making the PEEP compositions are also disclosed. In a simple yet innovative approach, a new class of polymers useful for adhesives, coatings, elastomers, and other valuable products is assembled from readily available starting materials without reliance on polyisocyanates or polyamines. The PEEP compositions have increased elongation and lower Tg when compared with traditional epoxy products.
A polyester-epoxide polymer composition which comprises a reaction product of:
A process which comprises heating, at a temperature within the range of 50° C. to 100° C., a mixture comprising a polyepoxide compound having an equivalent weight within the range of 125 to 250 g/equiv and a polyol composition comprising a polyester polyol, wherein the polyester polyol has a hydroxyl value within the range of 50 to 400 mg KOH/g, an average hydroxyl functionality within the range of 1.5 to 4.0, and an acid number less than 5 mg KOH/g, wherein the ratio of epoxy equivalents of the polyepoxide compound to hydroxyl equivalents of the polyol composition is within the range of 0.8 to 3.5, to produce a polyester-epoxide polymer composition having a glass-transition temperature as measured by differential scanning calorimetry within the range of −40° C. to 60° C.
A process which comprises reacting, in the presence of a catalyst comprising a base or a Lewis acid compound, a polyepoxide compound having an equivalent weight within the range of 125 to 250 g/equiv and a polyol composition comprising a polyester polyol, wherein the polyester polyol has a hydroxyl value within the range of 50 to 400 mg KOH/g, an average hydroxyl functionality within the range of 1.5 to 4.0, and an acid number less than 5 mg KOH/g, wherein the ratio of epoxy equivalents of the polyepoxide compound to hydroxyl equivalents of the polyol composition is within the range of 0.8 to 3.5, to produce a polyester-epoxide polymer composition having a glass-transition temperature as measured by differential scanning calorimetry within the range of −40° C. to 60° C.
Dependencies are inferred from the claim text.