Process for preparing high heat-distortion-temperature polyisocyanurate polymers
AssigneeThermocell Development, Ltd.
InventorStuart B. Smith
Life of this patent
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Abstract
A process for preparing a slow-burning, low-smoking, high heat-distortion-temperature polyisocyanurate polymer and the polymer produced thereby, which process comprises reacting an MDI prepolymer with a caprolactone polyol in the presence of a trimerization catalyst, wherein the MDI prepolymer is prepared from an MDI having a functionality of about 2.4 or less, and particularly a 2.4 isomer, and with an ethylene-oxide-capped polypropylene oxide polyol, the process providing for the formation of a rigid, high heat-distortion RIM or an open-spray molded part.
Claims33
A process for preparing a high heat-distortion-temperature polyisocyanurate polymer, which process comprises:
- reacting 100 parts of an MDI prepolymer with from about 5 to 50 parts by weight of a caprolactone polyester polyol in the presence of a catalytic amount of a trimerization catalyst, and wherein the MDI prepolymer is prepared by reacting 100 parts of an MDI, having a functionality of about 2.4 or less, with from about 35 to 75 parts of an ethylene-oxide-capped, polypropylene oxide polyol.
A process for preparing a slow-burning, low-smoking, high heat-distortion-temperature polyisocyanurate polymer, which process comprises:
- preparing A- and B-side compositions and spraying together the A- and B-side compositions onto a substrate, wherein the A-side composition comprises 100 parts of an MDI prepolymer, the prepolymer prepared by reacting 100 parts of an MDI of a 2.4 isomer, having a functionality of about 2.4 or less, with from about 35 to 75 parts of an ethylene-oxide-capped polypropylene oxide polyol, having a hydroxyl number of less than about 50, and the B-side composition comprises from about 5 to 50 parts of a caprolactone polyester polyol, having a hydroxyl number ranging from about 300 to 600, and which includes a catalytic amount of a trimerization catalyst, the polyisocyanurate polymer so prepared having a heat-distortion temperature of about 400.degree. F. or more.
Dependencies are inferred from the claim text.