Abstract:
A method for making a pressure sensitive adhesive comprising: (a) reacting (i) at least one dibasic acid or anhydride thereof with (ii) at least one epoxide having at least two epoxy groups, one diol or polyol, or one diamine at a stoichiometric molar excess of reactive carboxylic acid groups relative reactive epoxy groups, hydroxyl groups or amine groups to produce a thermoplastic prepolymer or oligomer capped with a carboxylic acid group at both prepolymer or oligomer chain ends, or a thermoplastic branched prepolymer or oligomer with at least two of the prepolymer or oligomer branches and chain ends capped with a carboxylic acid group; and (b) curing the resulting carboxylic acid-capped prepolymer or oligomer with at least one polyfunctional epoxy to produce a pressure sensitive adhesive, wherein the polyfunctional epoxy is not an epoxidized vegetable oil. A method for making a pressure sensitive adhesive comprising: (a) reacting at least one dibasic acid or anhydride thereof with at least one epoxide having at least two epoxy or oxirane groups at a stoichiometric molar excess of reactive epoxy or oxirane groups relative reactive carboxylic acid groups to produce a thermoplastic prepolymer or oligomer capped with an epoxy or an oxirane group at both prepolymer or oligomer chain ends, or a thermoplastic branched prepolymer or oligomer with at least two of the prepolymer or oligomer branches and chain ends capped with an epoxy or oxirane group; and (b) (i) curing the resulting epoxy-capped prepolymer or oligomer with at least one polybasic acid, or (ii) thermally curing the resulting epoxy-capped prepolymer or oligomer, to produce a pressure sensitive adhesive.
Abstract:
A curable casemaking adhesive, books and related articles bound thereby. In one embodiment, a UV curable hot melt adhesive is used to form the case, which is preferably also embossed. In another embodiment, a moisture curable hot melt adhesive is used to form the case, which is preferably also embossed.
Abstract:
Radiation- or thermally-initiated cationically-curable compounds based on styrene oxide moieties are linked to organic molecules, oligomers or polymers.
Abstract:
A pressure sensitive structural or sealant composition comprises (a) from 15 to 95% by weight of a telechelic polymer such as a hydroxyl-functional telechelic polymer and from 5 to 85% by weight of a heterotelechelic polydiene block polymer wherein at least one of the functionalities is the same as the functionality of the telechelic polymer, such as a heterotelechelic polydiene block polymer with hydroxyl and glycidyl ether funciontialities, and (b) a dual curing system wherein one curing agent cures the teolechelic polymer and the common functionality on the heterotelechelic polydiene block polymer such as a polyisocyanate, and the other curing agent cures the other functionality on the heterotelechelic polydiene block polymer at higher temperatures but does not cure under conditions required to cure the telechelic polymer, such as a polycarboxylic acid, polycarboxylic acid anhydride or a catalyst.
Abstract:
Pressure sensitive structural adhesive and sealant compositions comprising: (a) a polymer system comprising from 95 to 15 percent by weight of a telechelic polymer and from 5 to 85 percent by weight of a heterotelechelic polymer wherein at least one of the functionalities thereon is the same as the functionality on the telechelic polymer, and (b) a dual curing system wherein one element of the curing system cures the telechelic polymer and the common functionality on the heterotelechelic polymer and the other element cures the functionality on the heterotelechelic polymer but does not cure under the conditions required to cure the telechelic polymer to form a structural adhesive or sealant composition. In a preferred embodiment, the polymer system is comprised of a hydroxyl functional telechelic diol or polyol polymer and the heterotelechelic polymer is a monohydroxylated polydiene polymer which also has epoxidized olefin functionality. The dual curing system preferably is comprised of an isocyanate curing agent to cure through the hydroxyl groups at ambient temperatures to form a pressure sensitive adhesive or sealant and an amino resin to cure through the epoxy functionality upon baking to form a structural adhesive or sealant.
Abstract:
The invention herein is a non-aqueous solvent free process for producing UV curable adhesive and sealant compositions comprising a tackifying resin and a monohydroxylated epoxidized polydiene polymer which is comprised of at least two polymerizable ethnically unsaturated hydrocarbon monomers wherein at least one is a diene monomer which yields unsaturation suitable for epoxidation and wherein the polymer contains from 0.1 to 7.0 milliequivalents of epoxy per gram of polymer. The process involves mixing the components with an insoluble photoinitiator under conditions of high shear and/or cavitation. The invention also relates to a film of 5 mils to one inch thick which is formed from the composition made according to the process above.
Abstract:
Pressure sensitive structural adhesive and sealant compositions comprising: (a) a polymer system comprising from 95 to 15 percent by weight of a telechelic polymer and from 5 to 85 percent by weight of a heterotelechelic polymer wherein at least one of the functionalities thereon is the same as the functionality on the telechelic polymer, and (b) a dual curing system wherein one element of the curing system cures the telechelic polymer and the common functionality on the heterotelechelic polymer and the other element cures the functionality on the heterotelechelic polymer but does not cure under the conditions required to cure the telechelic polymer to form a structural adhesive or sealant composition. In a preferred embodiment, the polymer system is comprised of a hydroxyl functional telechelic diol or polyol polymer and the heterotelechelic polymer is a monohydroxylated polydiene polymer which also has epoxidized olefin functionality. The dual curing system preferably is comprised of an isocyanate curing agent to cure through the hydroxyl groups at ambient temperatures to form a pressure sensitive adhesive or sealant and an amino resin to cure through the epoxy functionality upon baking to form a structural adhesive or sealant.
Abstract:
A curing resin composition including (A) a cyanate ester resin, (B) an epoxy resin, (C) an active hydrogen-containing amine latent curing agent, and (D) an ion scavenger. The cyanate ester resin (A) is preferably at least one of a compound of formula (1) below, a compound of formula (2) below, and a polymer of at least one of these compounds (1) and (2).
NC—O-A1-Y1-A2-O—CN (1)
wherein the symbols are as defined in the description.
wherein the symbols are as defined in the description.
Abstract:
A two-component adhesive for an endoscope and a cured product thereof, the adhesive having a base resin and a curing agent. The base resin contains an epoxy resin (A), and the epoxy resin (A) includes an epoxy resin (a) having an average degree of polymerization of 2 or more. Also disclosed are an endoscope produced by using the adhesive for an endoscope and a method for producing the endoscope.
Abstract:
A curable divinylarene dioxide resin composition having a stoichiometric excess of divinylarene dioxides cured with amines, anhydrides, or polyphenols. The curable divinylarene dioxide resin composition includes (a) a stoichiometric excess of at least one divinylarene dioxide, (b) a co-reactive curing agent, and a catalyst. A process for making the above curable divinylarene dioxide resin composition; and a cured divinylarene dioxide resin composition made therefrom are also disclosed. The curable divinylarene dioxide resin composition has a longer pot life prior to cure and produces a thermoset having a higher heat resistance after cure than analogous prior art compositions made using stoichiometric compositions. The curable compositions of the present invention are advantageously useful as thermoset materials, coatings, composites, and adhesives.