3m Innovative Properties Company

Dmitriy Salnikov

George W Griesgraber

Michael A Kropp

Ilya Gorodisher

Lianzhou Chen

Robert J Webb

Guy D Joly

Naimul Karim

Clayton Allen George

Jie Yang

David T Amos

Kristin LaVelle Thunhorst

Larry S Hebert

Sohaib Elgimiabi

Ashish Kumar Khandpur

Jay S Schlechte

Scott A Boyd

Mary M Caruso

Jason W Balich

Yaoyao Chen

Nathan L Gergen

Henrik B Van Hengerich

Provided are adhesive articles and related methods of making and use. The adhesive article includes one or more patterned adhesive layers comprising compositionally and spatially distinct adhesives that are laterally disposed relative to each other. The first and second adhesives are optionally capable of being functionally cured to provide a structural adhesive bond with a substrate. These adhesives can provide high fracture toughness and high modulus characteristics not otherwise possible in a homogeneous adhesive composition. These adhesives can provide some degree of crack arrestment and significantly reduce the need for mechanical fasteners in industrial bonding applications.

Multi-phase adhesive articles and methods thereof

Provided is a curative part usable in a two-part curable composition. The curative part includes a liquid amine; a heterogeneous dispersant; and core-shell rubber particles having an elastomeric core and a (meth)acrylic shell. The core-shell rubber particles and the heterogeneous dispersant can be collectively shear-dispersed in the liquid amine such that the core-shell rubber particles are substantially non-aggregated and the curative part is phase-stable over a period of at least 3 months at ambient temperature. Advantageously, large amounts of core-shell rubber particles can thus be incorporated into a cured resin matrix, which can afford significantly enhanced impact performance.

Curable composition

A method for surfacing a polymeric composite article and/or for joining (for example, by bonding or by co-curing) the article and an adherend (for example, a second polymeric composite article) comprises

Surfacing and/or joining method

Provided is a curable composition containing a reactive mixture of components including an polyethersulfone having a chemical group reactive with an epoxide, a cycloaliphatic polyepoxide resin, a polyepoxide having a functionality greater than two, a liquid diepoxide resin, a first curative containing 9,9-bis(aminophenyl)fluorene or a derivative therefrom and having a curing onset temperature of from 150&#xb0; C. to 200&#xb0; C. The components can further comprise a second curative having a curing onset temperature of from 60&#xb0; C. to 180&#xb0; C. When thermally curing this composition, the second epoxy curative starts to cure before the first epoxy curative, thereby inhibiting vertical flow of the adhesive during the curing process.

Curable compositions and related methods

A composition is provided comprising: a) a curable epoxy resin; and b) 0.01-30% by weight of a polycarbodiimide according to Formula I:R&#x2014;{&#x2014;N&#x2550;C&#x2550;N&#x2014;R&#x2014;}&#x2014;N&#x2550;C&#x2550;N&#x2014;R&#x2003;&#x2003;(I)wherein n is an integer between 0 and 100, and wherein each R is independently selected from aromatic and aliphatic groups which contain between 1 and 24 carbons and which are optionally substituted, typically comprising 0.1-20% by weight of the polycarbodiimide. In some embodiments the present disclosure provides sheet materials made of such cured, uncured or partially cured materials. In some embodiments these compositions may be useful in making surfacing films for composite parts and may demonstrate good paint stripper resistance and microcrack resistance.

Epoxy compositions and surfacing films therefrom

A method is provided for making structured hybrid adhesive articles such as lightning strike protection sheets. In the embodiment for making lightning strike protection sheets, the method comprises the steps of: a) providing an adhesive article comprising: i) a base resin comprising an epoxy resin, ii) a first epoxy curative, and iii) a second epoxy curative; b) reacting the base resin with the first epoxy curative such that the first epoxy curative is substantially reacted with epoxy resin in the article and the second epoxy curative is substantially unreacted in the article; c) embossing the adhesive article with a relief pattern; d) depositing an electrically-conductive layer onto at least a portion of the embossed surface; and e) curing the adhesive article such that the second epoxy curative is substantially reacted with epoxy in the article. In some embodiments, the method additionally comprises a step of embedding a scrim in the adhesive.

Method of making structured hybrid adhesive articles including lightning strike protection sheets

A layered construction is provided having a storage modulus G'at 25&#xb0; C., comprising: a) a cured polymeric composite having a storage modulus G&#x2032;at 25&#xb0; C.; and b) a cured surfacing film bound thereto; wherein G&#x2032;is not greatly elevated over G&#x2032;, typically not more than 118% of G&#x2032;. In some embodiments the cured surfacing film comprises an electrically conductive layer, typically a metal layer. In some embodiments the cured surfacing film comprises a cured epoxy resin which may optionally be a chain-extended epoxy resin and may excludes phosphorus. The resulting layered construction may display high erosion resistance, high corrosion resistance, and high resistance to microcracking. In another aspect, methods of making the subject layered constructions are provided.

Surfacing film for composite structures

A polymerizable composition is described comprising a benzoxazine, and a tosylate, which when thermolyzed, forms a (meth)acrylamide, a (meth)acrylate, a vinyl ketone, a vinyl ether or a styrenic compound.

Process for preparing poly(benzoxazines)

Novel oligomers and polymers derived from the reaction of benzoxazine compounds with a mixture of epoxy compounds and amine compounds are disclosed. The compositions are useful in coating, sealants, adhesive and many other applications.

Amine/epoxy curing of benzoxazines

A polymerizable composition comprising a benzoxazine compound and a catalyst is described. The polymerizable composition may be cured to produce compositions useful in coating, sealants, adhesive and many other applications.

Polybenzoxazine composition

A polymerizable composition, articles, and methods are provided, wherein the polymerizable composition includes a benzoxazine, an acid-forming peroxide catalyst and optionally a film-forming polymer, a co-catalyst, a curative, or a combination thereof.

Polymerizable composition including a benzoxazine and an acid-forming peroxide catalyst, article, and method

Described are curable adhesives containing a polyacrylate component and an epoxy component, and that are preferably optically clear, as well as methods of using such adhesives and optical components and optical elements prepared from the adhesives.

Hybrid adhesives, articles, and methods

Thermosettable PSA compositions of the invention comprise a major proportion of the adhesive component of at least one acidic polymer and at least one amine-containing compound capable of reacting with acidic functional groups on the acidic polymer to cure the thermosettable PSA composition into a thermoset adhesive. The thermosettable PSA compositions are particularly useful for forming semi-structural or structural bonds. Thermoset adhesives therefrom and methods of forming the thermoset adhesives are also disclosed.

Growing community of inventors

Woodbury, MN, United States of America

Dmitriy Salnikov