Composite hydrogel-forming article and method of making same
Patent 4369229 Issued on January 18, 1983. Estimated Expiration Date: 
January 29, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 29, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3027347 3511659 3723171 3928262 Surface protective film for plasticized polyvinyl chloride substrates Adhesive tape Coextruded multilayer film Patent #: 4233367 InventorAssigneeApplicationNo. 06/229653 filed on 01/29/1981US Classes:428/421, Of fluorinated addition polymer from unsaturated monomers156/307.1, By curing of nonfully polymerized self-sustaining lamina351/160R, Eye contact type427/164, Transparent base428/412, Of polycarbonate428/508, Regenerated or modified cellulose428/515, Next to second addition polymer from unsaturated monomers428/520Ester, halide or nitrile of addition polymerExaminersPrimary: Ziegler, J.International ClassesB32B 27/08 (20060101)B29D 11/00 (20060101) G02B 1/04 (20060101) AbstractPolymer blends capable of forming hydrogels upon immersion in water are bonded by heat and pressure alone to water-resistant polymer compositions compatible with vinyl lactam polymers to form laminates. Bonding can also be achieved by casting on the surface of the polymer composition a solution of the blend in a solvent inert to the polymer composition and evaporating the solvent. The blends are optically clear blends of vinyl lactam polymers or copolymers with water insoluble copolymers of a hydrophobic water-insoluble ethylenically unsaturated monomer, an ethylenically unsaturated monomer containing an acid group, and optionally a hydrophilic ethylenically unsaturated monomer free from acidic groups.Other References
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