Use of pendant free-radically polymerizable moieties with polar polymers to prepare hydrophilic pressure sensitive adhesive compositions
Assignee3M Innovative Properties Company
InventorsSteven S. Kantner, Wilhelm Kuester
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Abstract
Cross-linked, hydrophilic pressure sensitive adhesive compositions, (meth)acrylate-functional polar polymers which serve as precursors to them, and medical products using such adhesives are disclosed. The cross-linked polymer is prepared by free-radically cross-linking reactive polymers that are functionalized with pendant polymerizable moieties. Medical products that include such compositions are biomedical electrodes, pharmaceutical delivery devices, and medical skin coverings such as wound dressings.
Claims22
A hydrophilic pressure sensitive adhesive composition comprising:
- a crosslinked polar, hydrophilic polymer and sufficient humectant to render the composition pressure sensitive adhesive, wherein the crosslinked polymer is prepared from the reaction of hydrophilic, carboxy-functional polymers with epoxy-functional (meth)acrylates to become pendant polymerizable moieties, and wherein the hydrophilic, carboxy-functional polymers are functionalized with the pendant polymerizable moieties with an average of 2,500 to 25,000 g/mole molecular weight between the pendant polymerizable moieties along the backbone.
A method of preparing a crosslinked hydrophilic pressure sensitive adhesive composition, comprising the steps of:
- (a) reacting a carboxy-functional polar polymer with an epoxy (meth)acrylate to generate a functionalized polymer having pendant polymerizable moieties on the polymer with an average of 2,500 to 25,000 g/mole molecular weight between the pendant polymerizable moieties along the backbone;
- (b) free radically crosslinking the functionalized polymer in the presence of humectant to generate the crosslinked composition.
Dependencies are inferred from the claim text.