摘要:
Hot melt adhesives, useful for both glue-pot and glue-gun applications, are formulated so that they can be applied at temperatures no higher than 280° F. and preferably at temperatures of at most 250°F. The adhesive compositions have a heat resistance of at least 125°F. and are readily shaped into glue sticks for use in glue guns. The adhesive for the hot-melt adhesive compositions is suitably compounded with tackifying resin and/or wax. The resulting composition has a sharp viscosity profile, which is readily achieved, e.g., by using a high melt index adhesive polymer as an essential component.
摘要:
Hot melt adhesives, useful for both glue-pot and glue-gun applications, are formulated so that they can be applied at temperatures no higher than 280° F. and preferably at temperatures of at most 250°F. The adhesive compositions have a heat resistance of at least 125°F. and are readily shaped into glue sticks for use in glue guns. The adhesive for the hot-melt adhesive compositions is suitably compounded with tackifying resin and/or wax. The resulting composition has a sharp viscosity profile, which is readily achieved, e.g., by using a high melt index adhesive polymer as an essential component.
摘要:
A hot-melt adhesive of ethylene/vinyl acetate copolymer and tackifying resin can be spread into a thin layer that remains tacky for more than 5 seconds, after which a bond can be made without applying heat or more than hand pressure. Within a short period of time, the adhesive crystallizes so that the bond becomes creep-resistant. The temperature at which this hot-melt adhesive can be spread into thin layers is significantly lower than could be used with prior hot-melt adhesives that develop creep resistance.
摘要:
A PVC-free sealing compound, particularly a sealing compound for use on containers, comprising a mixture of low density polyethylene or linear low density polyethylene; a styrene-isoprene-styrene block copolymer or a thermoplastic elastomeric blend of an ethylene-propylene copolymer such as EPM or EPDM, EVA and process oil, one or more fillers such as talc, and optionally cork powder.
摘要:
A composition for three-dimension (3D) printing, a method for 3D printing, and a resulting article having porous structure are provided. Such a composition includes from 50% to 100%o by weight of a base polymer comprising polyolefin (such as ultrahigh molecular weight polyethylene), from 0% to 50% by weight of a glue polymer (such as HDPE or PP), and optionally additive. A composition can be applied in a layer, and the base polymer and the glue polymer each has a predetermined size or size distribution. The composition is sintered in a selected area to form a layer of a solid article, which has a predetermined pore size or pore size distribution. The predetermined particle size or size distribution for each of the base polymer and the glue polymer is determined through computer simulation based on the predetermined pore size or pore size distribution in the layer of the solid article.