Polyurethane sealants and adhesives containing saturated hydrocarbon polyols
AssigneeShell Oil Company
InventorDavid J. St. Clair
Life of this patent
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Abstract
Polyurethane sealants and adhesives made with saturated, polyhydroxylated polydiene polymers and polyisocyanates have improved tack and peel strength when the crosslinked polyurethane has non-load bearing saturated hydrocarbon segments formed by use of substantially less than stoichiometric amounts of polyisocyanate or by addition of monohydroxylated polydiene polymers.
Claims20
A polyurethane composition comprising a polyisocyanate having a functionality of from 2.2 to 10 and a saturated, polyhydroxylated polydiene polymer having a hydroxyl equivalent weight of from 500 to 20,000 wherein the NCO:OH ratio is between 0.3:1 and 0.7:1.
A polyurethane composition comprising a polyisocyanate having a functionality of from 2.2 to 10, a saturated polyhydroxylated polydiene having a hydroxyl equivalent weight from 500 to 20,000, and a saturated monohydroxylated polydiene having a hydroxyl equivalent weight from 500 to 20,000, wherein the NCO:OH ratio is from 0.9:1 to 1.1:1 and wherein the ratio of saturated, monohydroxylated polydiene to saturated, polyhydroxylated polydiene is from 85:15 to 25:75.
A polyurethane adhesive composition comprising a polyisocyanate having a functionality of from 2.2 to 10, a saturated dihydroxylated polydiene having a peak molecular weight from 1,000 to 40,000, and a saturated monohydroxylated polydiene having a peak molecular weight from 500 to 20,000, wherein the NCO:OH ratio is from 0.9:1 to 1.1:1 and wherein the ratio of saturated, monohydroxylated polydiene to saturated, dihydroxylated polydiene is from 85:15 to 25:75.
Dependencies are inferred from the claim text.