National Starch and Chemical Investment Holding Corporation

Robert D Harlan

Jules E Schoenberg

Paul M Petersen

Smita M Shah

Stephen F Hatfield

Christopher Gerald Gore

Grant T Shouldice

Deepak Hariharan

Johnson K Samuel

The present invention is directed to multireactivity polymercaptans, star-shaped copolymers and methods of preparing wherein the polymer comprises a polyvalent mercaptan core and three or more polymeric arms which extend radially from the core. The polyvalent mercaptan core comprises three or more thiol groups, wherein at least two of the thiol groups are of different reactivities, such that the core is of differential reactivity. These multifunctional thiols, which will be referred to as cores of differential reactivity, act as chain transfer agents in a free radical polymerization process.

Multireactivity polymercaptans, star polymers and methods of preparation

This invention relates to pressure sensitive adhesives, and processes of preparing such adhesives, comprising random star polymers which are crosslinked by reaction with multifunctional crosslinking agent. These adhesives can be used in coated articles.

Use of star-branched polymers in pressure sensitive adhesives

The present invention is directed to amphiphilic star polymers and their use as emulsion stabilizers in emulsion polymerization.

Water soluble amphiphilic heteratom star polymers and their use as

Polylactide or polyglycolide graft copolymers, prepared with grafts comprising up to 40% by total polymer weight, but not 0%, of glycolide or the D- or L-isomer of lactide in an enantiomeric excess of 84% on a saturated polymer backbone, are suitable for use as the thermoplastic elastomeric component of hot melt adhesives.

Lactide graft copolymers and hot melt adhesives prepared from same

Polylactide or polyglycolide graft copolymers are prepared by a process comprising preparing a backbone polymer from acrylate and/or methacrylate monomers and from one or more polymerizable monomers that contain a functional group unreactive in a free-radical polymerization, the backbone polymer being compatible with lactide monomer or lactide polymer; adding to the resulting polymer up to 40% by total polymer weight, but not 0%, of the D- or L-isomer of lactide in an enantiomeric excess of 84%; heating the mixture of lactide and polymer to a temperature of 80.degree.-175.degree. C. in the presence of a tin catalyst for a period of time effective to polymerize the lactide and react the lactide with the functional group on the backbone polymer.

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Somerville, NJ, United States of America

Robert D Harlan