Abstract:
The present disclosure relates to a thermosettable precursor of an expanded structural adhesive composition comprising: a) an epoxy compound; b) an epoxy curing agent; c) an expanding agent; and d) a mineral pigment selected from the group of phosphate metal complexes. The present disclosure also relates to a method of bonding two parts and to uses of the thermosettable precursor of an expanded structural adhesive composition.
Abstract:
Disclosed is an adhesive sheet having an expandable adhesive layer 2 on one side or both sides of a base 1, wherein the expandable adhesive layer 2 contains an epoxy resin comprising a polyfunctional epoxy resin, a phenol resin as a curing agent, an imidazole-based compound as a curing catalyst and a temperature-sensitive foaming agent. Especially, the adhesive sheet has properties such as fast curability, heat resistance and adhesiveness in good balance, and it has also various excellent properties such as thermal conductivity caused by a good filling property.
Abstract:
A process to apply a foamable water-based adhesive comprises combining, in a pressure-tight container having an outlet valve, a) a first aqueous polymer having a pH-value above 6 and containing a dissolved or dispersed salt that can liberate a gas, and b) a second aqueous polymer comprising an acid and having a pH-value lower than 5, and combined aqueous releasing the combined aqueous polymers from the pressure-tight container through the outlet valve onto a substrate, whereby gas bubbles are formed in the aqueous polymers leaving the valve, thus foaming the water-based adhesive.
Abstract:
Applying heat activatable adhesive to a substrate, the adhesive is solid at ambient temperature and can be melted at a temperature below its heat activation temperature wherein the adhesive formulation is supplied to a hot melt applicator where it is heated to above its melting point and below its activation temperature and the melt viscosity of the molten adhesive is controlled so that it can be ejected from the hot melt applicator onto a substrate to provide a coherent bead that adheres to the substrate and is dry to the touch on cooling and upon activation the adhesive is capable of expanding with a volume expansion greater than about 250 %.
Abstract:
The present disclosure relates to a method of applying a pressure sensitive adhesive to a substrate, which comprises the steps of: a) providing an uncrosslinked curable precursor of a pressure sensitive adhesive comprising: (1) a (meth)acrylate copolymer component comprising: i. C 1 -C 32 (meth)acrylic acid ester monomer units; ii. ethylenically unsaturated monomer units having functional groups selected from the group consisting of acid, hydroxyl, acid anhydride, epoxide, amine, amide groups, and any combinations thereof; and iii. optionally, further ethylenically unsaturated monomer units which are copolymerizable with monomer units (i) and/or (ii);
(2) a thermal crosslinking system; (3) at least one expandable microsphere; (4) optionally, a tackifying system; and (5) optionally, at least one pigment;
b) subjecting the curable precursor of a pressure sensitive adhesive to a first heating step such that the curable precursor of a pressure sensitive adhesive is partially crosslinked; c) contacting the curable precursor of a pressure sensitive adhesive obtained in step b) to at least part of the surface of the substrate; d) subjecting the curable precursor of a pressure sensitive adhesive to a second heating step such that the curable precursor of a pressure sensitive adhesive is fully crosslinked; and e) optionally, allowing the polymeric foam layer to cool down on the substrate.
Abstract:
A dressing suitable for topical application to the body, including a carrier substrate having a first side and opposing second side; and a layer of a foamed adhesive composition applied to the second side of the carrier substrate, where the layer of foamed adhesive composition includes a substantially homogeneous distribution of closed cells having an inert gas contained therein.
Abstract:
An adhesive comprising a solvent free powder of average particle size in the range 20 to 300 preferably 20 to 150 microns is heat activated at a temperature in the range 140° C. to 220° C., is flowable at a temperature below the heat activation temperature and is dry and non-tacky to the touch at ambient temperature, the use of a powdered adhesive is particularly useful for bonding of non-planar surfaces with complex contours.
Abstract:
Article comprises a polymer foam having a surface roughness 75 Microm (measured by laser triangulation profilometry). The foam comprises microspheres, at least one of which is an expandable polymeric microsphere. Independent claims are also included for the following: (A) preparing the article, comprising: (a) melt mixing a polymer composition and several microspheres to form an expandable extrudable composition, (b) extruding the composition through a die to form a foam, and (c) at least partially expanding the microsphere(s) before the composition exits the die; and (B) a multi-layer article comprising: (a) a substrate having a pair of major surfaces, and (b) a foam article on a major surface of the substrate.