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Low odor, light color, disposable article construction adhesive

a technology of adhesives and disposable articles, applied in the direction of synthetic resin layered products, packaging, tyre parts, etc., can solve the problems of significant heat retention of adhesives, and achieve the effects of low molecular weight, high melt, and high viscosity

Inactive Publication Date: 2005-03-17
ADHERENT LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

In production of disposables, a hot melt adhesive (HMA) is typically extruded at elevated temperature onto the disposable. Layers of a fabric or film can be added and blended. Disposables with secure bonding that traps layers of fabric or tissue in the HMA can be made because the adhesive can be extruded directly on the work piece. In recent years, increasing attention has been directed to development of sprayable hot melt adhesives. The work piece or substrate-manufacturing regimen can use a spray-on adhesive to increase productivity. Such spray-on adhesives are delivered from a plurality of narrow orifices in the form of fibers, threads or filaments having a substantially circular cross-section with a diameter less than 0.05 inch, typically about 0.01 to 0.001 inch. Fine line or spiral spray patterns are used. The spray-on adhesive takes on the form of fibers that have substantial surface area in comparison to the mass of the fiber. Typically, after spraying, the adhesives reach ambient temperatures upon immediate contact with the work piece. Extruded hot melt adhesives retain a significant amount of heat after application. Ambient temperature is the temperature of the surrounding environment and temperature of the disposable. In these construction applications, the disposable and the temperature of the environment are typically not substantially different. Sprayed adhesives take the form of a solid matrix formed as a result of the combined application adhesive fibers creating an overlapping distribution of threads or fibers on the disposable. Spray adhesive technology is used to make disposable articles by combining, e.g. a film with a woven or non-woven fabric with the adhesive arid forming a bond between the substrates or layers by pressure. Such conventional spray-on adhesives form typically a laminated adhesive bonding with the film sheet and the fabric layers.

Problems solved by technology

Extruded hot melt adhesives retain a significant amount of heat after application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples 1-13

The table below is a summary of data generated for these products. About 2000 g batches of each were made by melt blending in a lightning mixer at 300° F. The Brookfield Thermosel viscosity and Mettler Softening Point were measured. We laminated polyethylene and non-woven films using a Nordson spiral spray head. We used both spiral spray and Fineline patterns. The non-woven / polyethylene laminate was tested for initial T-peel adhesion.

The best products have a maximum initial spiral spray value with minimal falloff of aged spiral spray values. The best products appear to be those with 25-30% tackifying resin and EVA primarily composed of 20% vinyl acetate. Products that are made completely from 28% vinyl acetate EVA tend to be soft and can have cohesive problems. The lower vinyl acetate EVA is more crystalline and cohesive.

Spiral peelFineline peelViscositySofteningExampleEscorezEVAEVAInitialAgedInitialAged@ 149° C.PointNbr.563728 / 250020 / 2500(g)(g)(g)(g)300° F.(° F.)10.150.4250.42...

examples 14-19

The table below is a summary of data generated for the ethylene olefin products. About 2000 g batches of each were made by melt blending in a lightning mixer at 300° F. The Brookfield Thermosel viscosity and Mettler Softening Point were measured. We laminated polyethylene and non-woven films using a Nordson spiral spray head. We used both spiral spray and Fineline patterns. The non-woven / polyethylene laminate was tested for initial T-peel adhesion 120° F.

ExampleExampleExampleExampleExampleExample141516171819Ethylene / octene70.065.065.060.0polymerEVA 28%69.8EVA-2500 MIABA15.0ABA25.0EVA 20%69.8EVA-2500 MIEastotac 14230.030.0tackifierEscorez 563729.834.829.834.8tackifierIrganox 10100.20.20.20.20.20.2antioxidantSpiral Peel9338111143(Initial)AdhesionFineline Peel89357296(Initial)AdhesionViscosity @5380521084807600300° F.Mettler170175172174Softening Point

The ethylene / octene polymer is a 1000 MI ethylene octene (density of about 0.860 to 0.890) polymer. The peel values of the Ex. 17 are...

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PUM

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Abstract

We have found a novel spray-on adhesive composition made from components including a high melt index polymer and a high melt tackifier that interact to produce a composition that can form a low odor, light color, non-tacky, hot melt adhesive material that can be used in disposable article manufacture. The adhesive is thermally stable at hot melt application conditions, is low in cost, is easily applied and produces high quality disposable articles.

Description

FIELD OF THE INVENTION The invention relates to an adhesive and to a composite article made by joining components with the adhesive. In one embodiment, a disposable article can be made by adhesively bonding layers including a film, a woven or non-woven fabric, tissue or sheet to a sheet-like material using a novel hot melt adhesive that can be variously applied or can be sprayed. Still further, the invention relates to the manufacture of a disposable composite article having a cover and an absorbent layer, held within the cover. The cover can be formed from a porous sheet adhered to a fluid impervious backing layer and can have further fabrics, sheets or films added. The absorbent layer can be made of a tissue, an absorbent, or combinations of an absorbent and outer cover layers. The adhesive of the invention is used to bind the components in a mechanically stable article or to join the outer cover to the absorbent. The sprayable hot melt adhesive composition typically contains a n...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B27/04C08F210/02C08F210/16C08L23/08C09J123/08
CPCA61L15/58B32B5/022B32B5/024B32B7/12B32B7/14B32B27/04B32B27/08B32B27/12B32B27/18B32B27/306B32B27/32B32B27/325B32B2250/02B32B2255/02B32B2255/10B32B2255/26B32B2262/02B32B2555/02C08F210/02C08F210/16C08L23/0815C08L23/0853C08L31/04C08L57/00C08L2205/02C09J123/0815C09J123/0853C09J123/0869C09J131/04C09J153/02C09J153/025C09J2201/61Y10T428/2822C08L2666/02C08F220/02C08F2500/23C08F218/08C08F210/14C08F2500/12C08F2500/02C08F2500/03C08F2500/17C08L2666/04C08L33/06C09J2301/304Y10T428/249958Y10T428/31891Y10T428/31935Y10T442/674B32B27/304B32B2037/1215
Inventor QUINN, THOMAS H.
Owner ADHERENT LAB
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