Cationically curable polyurethane compositions having vinyl ether functionality
AssigneeDeSoto, Inc.
InventorsGerry K. Noren, John J. Krajewski, Edward J. Murphy
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Abstract
A cationically curable polyurethane composition comprises the reaction product of an organic polyisocyanate with a transvinylation polyhydric alcohol mixture containing hydroxy groups. The polyisocyanate consumes substantially all of the available hydroxy groups in the transvinylation polyhydric alcohol mixture. These compositions are particularly useful in stereolithography. A method of transvinylation utilizing ultrasonic energy is also disclosed.
Claims38
A cationically curable polyurethane composition comprising the reaction product of an organic polyisocyanate with a transvinylation polyhydric alcohol mixture containing hydroxy groups that is the transvinylation reaction product of (1) at least one vinyl ether and (2) at least one polyhydric alcohol having an average of more than 2 hydroxy groups per molecule, with the polyisocyanate consuming substantially all of the available hydroxy groups of the transvinylation mixture.
A cationically curable polyurethane composition comprising the reaction product of an organic diisocyanate with a transvinylation polyhydric alcohol mixture containing hydroxy groups that is the transvinylation reaction product of (1) a vinyl ether having the formula:
- (CH.sub.2 .dbd.CH--O--CH.sub.2).sub.n R.sup.g
- wherein R.sup.g is an aliphatic group that is only reactive at the site(s) where a vinyl ether containing radical is bound and n is equal to 1 to 4 with the proviso that n is less than or equal to the number of reactive sites of R.sup.g and (2) at least one aliphatic polyhydric alcohol containing 2 to about 10 carbon atoms and having an average of 3 or more hydroxy groups per molecule, wherein the diisocyanate consumes substantially all of the available hydroxy groups of the transvinylation mixture and the equivalent ratio of vinyl ether to polyhydric alcohol is in the range of about 0.5:1 to about 5:1.
A method of producing a transvinylated aliphatic polyhydric alcohol mixture comprising subjecting an admixture of a vinyl ether and an aliphatic polyhydric alcohol to ultrasonic energy for a time period effective to produce a transvinylated polyhydric alcohol mixture.
A method of producing a cationically curable polyurethane composition comprising the steps of:
- (a) reacting an admixture of a vinyl ether, an polyhydric alcohol having an average of more than 2 hydroxy groups per molecule and a catalyst by subjecting the admixture to ultrasonic energy for a time period effective to produce a transvinylation polyhydric alcohol mixture containing hydroxy groups;
- and
- (b) reacting a polyisocyanate with the reaction product of step (a), to consume substantially all of the available reactive groups in the transvinylation mixture.
Dependencies are inferred from the claim text.