Minnesota Mining and Manufacturing Company

3m Innovative Properties Company

Other

Spencer F Silver

Joaquin Delgado

Eugene G Joseph

William R Bronn

Richard J Goetz

Roger W Leinen

Donald H Lucast

Robert J Oliveira

James E Garbe

Felix P Lau

Michael R Kesti

John P Banovetz

Margaret M Sheridan

A contact printable adhesive composition comprises (a) swellable, elastomeric microspheres and (b) at least one polymerizable monomer or a mixture of polymerizable monomers capable of swelling the microspheres. As used in this application &ldquo;contact printable adhesive composition&rdquo; is a composition that can be used in a contact printing process and then cured. The cured contact printable adhesive composition will generally be referred to as &ldquo;contact printed adhesive&rdquo;.

Contact printable adhesive composition and methods of making thereof

A thermomorphic pressure sensitive adhesive is provided. The adhesive includes a continuous crystalline polymer component and a discrete crosslinked elastomeric polymer component. The pressure sensitive adhesive has at least one distinct crystalline melting point and is capable of transitioning between a secondary shape and a primary shape upon an increase in temperature.

Thermomorphic 'smart' pressure sensitive adhesives

Unsupported pressure sensitive adhesive (PSA) films of tacky, polymeric microspheres are provided. The opposite major surfaces of the film provide different levels of peel adhesion, allowing for removability without substrate damage. In addition, the PSA films provide high shear strength and good tensile properties.

Pressure sensitive adhesive film having differential adhesive properties

We have discovered a low trauma wound dressing including a moisture-vapor permeable backing and a contiguous particulate adhesive layer comprised of tacky, substantially solvent-insoluble, solvent-dispersible, acrylate-based, elastomeric, pressure-sensitive adhesive microspheres.

Low trauma wound dressing with improved moisture vapor permeability

Composite pressure sensitive adhesive microspheres are provided comprising two or more water insoluble polymers that are mixed wholly within the boundaries of polymeric microspheres. The range of monomers and polymers are chosen to tailor the properties of the composite pressure sensitive adhesive microspheres for specific performance and/or application requirements. Any polymer that can be dissolved into a solvent monomer or mixture of solvent monomers can be used to prepare the composite pressure sensitive adhesive microspheres. Pressure sensitive adhesive microspheres according to this invention can be prepared using free radical suspension polymerization.

Composite pressure sensitive adhesive microspheres

The invention relates to a swellable, solvent-insoluble, tack-free, elastomeric, acrylate microsphere having a shear storage modulus of at least 6.0.times.10.sup.6 Pascals at 23.degree. C. and 1 Hz and a Tg of less than about 0.degree. C., wherein the microsphere comprises the polymerization product of:

Tack-free elastomeric acrylate microspheres

The invention provides inherently tacky, polymeric, organic, solvent-insoluble, solvent dispersible, elastomeric, pressure sensitive adhesive microspheres having pendant hydrophilic polymeric or oligomeric moieties having a degree of polymerization greater than or equal to 2. The microspheres which are sterically stabilized can offer enhanced stability against coagulation caused by alkali, alkali salts, polyelectrolytes and repeated freeze/thaw cycles. The present invention also provides pressure-sensitive adhesives comprising these microspheres including aerosol spray PSAs, coated sheet materials prepared therefrom, and method of making the microspheres.

Tacky microspheres having pendant hydrophilic polymeric or oligomeric

A repositionable pressure-sensitive adhesive comprising from about 70% to about 99% solid, polymeric, acrylate, inherently tacky, infusible, solvent-insoluble, solvent-dispersible, elastomeric microspheres comprising at least one alkyl acrylate or alkyl methacrylate ester; and at least one polar monomer, and correspondingly, from about 30% to about 1% of a binder copolymer comprising an elastomeric polymeric backbone having pendant therefrom high Tg polymeric moieties.

Pressure-sensitive adhesive comprising solid tacky microspheres and

A pressure-sensitive adhesive comprising an acrylate matrix, and swellable, infusible, insoluble, elastomeric acrylate microspheres, each of the microspheres having discrete boundaries, the microspheres and the matrix forming an interpenetrating polymer network within the boundaries of the microspheres.

Interpenetrating pressure-sensitive adhesive polymer networks

The present invention relates to elastomeric copolymers and block copolymers, e.g., based upon styrene/isoprene, having a novel condensed phase structure wherein polymer branches occur along the polymer backbone, either at a predetermined location or at random locations. The polymers are made by a method which comprises the step of reacting, under polymerization conditions, hydrocarbyl lithium initiator, at least one anionically polymerizable compound, and an organometallic- substituted styrene condensing agent. The reactants may be added simultaneously to produce a copolymer with polymer branch segments randomly located along the polymer backbone or sequentially to produce a copolymer with branches located at the same predetermined location along the polymer backbone. The resultant polymers may be further reacted with a linking agent to form multi-arm copolymers.

Condensed phase polymers

The present invention relates to elastomeric copolymers and block copolymers, e.g., based upon styrene/isoprene, having a novel condensed phase structure wherein polymer branches occur along the polymer backbone, either at a predetermined location or at random locations. The polymers are made by a method which comprises the step of reacting, under polymerization conditions, hydrocarbyl lithium initiator, at least one anionically polymerizable compound, and an organometallic-substituted styrene condensing agent. The reactants may be added simultaneously to produce a copolymer with polymer branch segments randomly located along the polymer backbone or sequentially to produce a copolymer with branches located at the same predetermined location along the polymer backbone. The resultant polymers may be further reacted with a linking agent to form multi-arm copolymers.

Growing community of inventors

White Bear Lake, MN, United States of America

Spencer F Silver