Polymerization of .beta.-lactones under rim conditions
AssigneeShell Oil Company
InventorsSharon M. Beshouri, Pui K. Wong, Dale L. Handlin, Jr.
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Abstract
A method is disclosed for making a molded article of manufacture of polymerized .beta.-lactone which method involves injecting into a mold at least one .beta.-lactone monomer and at least one nucleophilic initiator, substantially polymerizing the .beta.-lactone in the mold and removing the resultant polymerized article from the mold.
Claims19
A method for making a molded article of manufacture comprising polymerized .beta.-lactone which method comprises injecting into a mold at least one .beta.-lactone monomer and from about 1.0.times.10.sup.-8 to about 1.0.times.10.sup.-1 by weight basis monomer of at least one nucleophilic initiator, polymerizing said .beta.-lactone in said mold and removing the resultant polymerized article from the mold.
The polymer article of manufacture produced according to the method of claim 16 having a crystallinity of greater than about seventy-five percent.
A method for making a molded article of manufacture comprising polymerized .beta.-lactone which method comprises injecting into a mold at least one .beta.-lactone monomer of the formula:
- ##STR6## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are individually hydrogen or methyl and from about 0.01 to about 1 percent by weight basis monomer of at least one nucleophilic initiator selected from tertiary amines or tertiary phosphines, polymerizing said .beta.-lactone in said mold and removing the resultant polymerized article from the mold.
Dependencies are inferred from the claim text.