摘要:
A structural adhesive composition that is suitable for high-strength bonding of metals and aerospace structural materials. In one embodiment, the structural adhesive composition based on a two-part system, which is curable at or below 200°F (93 °C). The two-part system is composed of a resinous part (A) and a catalyst part (B), which may be stored separately at room temperature until they are ready to be used. The resinous part (A) includes at least two different multifunctional epoxy resins with different functionality selected from difunctional, trifunctional, and tetrafunctional epoxy resins, certain toughening components, and inorganic filler particles as a rheology/thixotrophy modifying component. The toughening components include core-shell rubber particles with different particle sizes and at least one of an elastomeric polymer and a polyethersulfone polymer. The catalyst part (B) includes an aliphatic or cyclic amine compound as a curing agent and inorganic filler as a rheology/thixotropy modifying component. The weight ratio of part (A) to part (B) is within the range of 3:2 to 10:2. In another embodiment, the structural adhesive composition is based on a one-part system which includes the components of the resinous part (A) in the two-part system mixed with a latent amine curing agent. The one-part system may further include an imidazole and/or an aliphatic amine. The one-part system is curable within the temperature range of 140-300°F (60-150°C). The paste adhesive disclosed herein has film-like properties and is particularly useful in rapid-assembly aerospace structure bonding applications.
摘要:
The present invention relates to a B-stageable silicone adhesive having microencapsulation. The encapsulated B-stageable silicone adhesive allows lengthening the assembly time between applying the adhesive and lamination. Although exemplified with silicone adhesives, the inventive encapsulated adhesive concept has potentially broad applicability to other types of adhesives.
摘要:
A thermally conductive composite article is provided having a polytetrafluoroethylene matrix, thermally conductive particles, and energy expandable hollow polymeric particles. The thermally conductive composite article may additionally include an elastomer material disposed within the article in a discontinuous fashion.
摘要:
Spacer particles for a resin composition layer have a compressive strength at 10% compressive deformation at room temperature of 0.05 to 10 MPa or a compressive strength at room temperature of 0.01 to 2 N determined as a compressive load at 10% compressive deformation when the spacer particles are added into the resin composition layer so that a resin composition layer contains 48% by mass of the spacer particles, have a rate of change in compressive strength at 10% compressive deformation by a temperature change from room temperature to 50°C of 5% or less, a rate of change in compressive strength at 10% compressive deformation by a temperature change from -20°C to room temperature of 30% or less, or a rate of change in compressive strength by a temperature change from -50°C to 50°C of 15% or less determined as a compressive load at 10% compressive deformation, when the spacer particles are added into the resin composition layer so that a resin composition layer contains 48% by mass of the spacer particles, and have a volume average particle diameter of 2 to 200 µm and a coefficient of variation in particle diameter of 15% or less.
摘要:
The present invention relates to an adhesive compositions, facestocks and/or packaging labels containing same, where such compositions, facestocks and/or labels are designed to facilitate the recyclability of a plastic article formed from any suitable polymer or mixture of polymers (e.g., a polyethylene terephthalate (PET), high density polyethylene (HDPE), polyvinyl chloride (PVC), low density polyethylene (LDPE), polypropylene (PP), polystyrene (PS), or others of all plastic types), or even glass bottles. In another embodiment, the present invention relates to a method for removing an adhesive composition, facestock and/or packaging label containing same, from a plastic article that is to be recycled.
摘要:
Articles are provided that include an optical film and an optically clear pressure sensitive adhesive layer on at least one outer surface of the optical film. Additionally, articles are provided that include a pressure sensitive adhesive layer that resists bubble formation when adhered to an outgassing substrate. The pressure sensitive adhesive layer in the various articles contain a (mcth)acrylatc block copolymer.